Repository: ClusterLabs/ha_cluster_exporter
Pull request #200 (2022-05-23 11:37:03)

prometheus best practices, TLS and basic auth support
The main point was to enable TLS support.
One pre-requisite for this was a `log.Logger` object ([reference](https://pkg.go.dev/github.com/prometheus/exporter-toolkit@v0.7.1/web#ListenAndServe)) which is not available in the currently used logging package `logrus`.
I took this as an opportunity to port some best practices from e.g. [HAProxy exporter](https://github.com/prometheus/haproxy_exporter) and [MySQL Server exporter](https://github.com/prometheus/mysqld_exporter). This includes:
- using [promlog](https://pkg.go.dev/github.com/prometheus/common/promlog) instead of logrus for logging a38c72a2b6b9daf631e8dde7074e747a510c645d
  - DEPREACTION: log format changed due to this
- using [kingpin](https://pkg.go.dev/gopkg.in/alecthomas/kingpin.v2) instead if pflag to parse commandline a38c72a2b6b9daf631e8dde7074e747a510c645d
  - this is completely backwards compatible for the config file and command line argument setup  
    - some flags are marked as deprecated but will still work
  - includes a wrapper to parse `viper` config and overwrite it with `kinpin` flags
- add TLS and basic auth support by using [exporter-toolkit](https://pkg.go.dev/github.com/prometheus/exporter-toolkit)
- build binaries with `promu` 945cbc11d7c5093dcffa02f46b751d8ee1f0b683
- test: build, run and test binary 3017a2fa77ccf61bcbdc5b26b501e5b9bd374e35

In addition to that, the OBS + release CI is kind of broken at the moment. These commits tend to fix it:
- fix github url in specfile e219a0222e5b0ff7f7ecc0cf3692d74170a4fd08
- fix github release e08c01af4c2a7c5436ebf84b16ed50f2829f9e84


Patch:
diff --git a/.github/workflows/exporter-ci.yml b/.github/workflows/exporter-ci.yml
index 469759d..f1467c6 100644
--- a/.github/workflows/exporter-ci.yml
+++ b/.github/workflows/exporter-ci.yml
@@ -24,13 +24,13 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/setup-go@v2
-      with:
-        go-version: ^1.14
-      id: go
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
       with:
         fetch-depth: 0
+    - uses: actions/setup-go@v3
+      with:
+        go-version-file: 'go.mod'
+      id: go
     - name: static analysis
       run: make static-checks
     - name: test
@@ -43,7 +43,7 @@ jobs:
         for FILE in build/bin/*; do
           gzip $FILE
         done
-    - uses: actions/upload-artifact@v2
+    - uses: actions/upload-artifact@v3
       with:
         name: ha_cluster_exporter
         path: build/bin
@@ -104,10 +104,10 @@ jobs:
     if: github.event.release
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/download-artifact@v2
+    - uses: actions/download-artifact@v3
       with:
         name: ha_cluster_exporter
-    - uses: AButler/upload-release-assets@v2.0
+    - uses: softprops/action-gh-release@v1
       with:
         files: 'ha_cluster_exporter-*'
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.gitignore b/.gitignore
index 0b72cd6..f287efe 100644
--- a/.gitignore
+++ b/.gitignore
@@ -17,3 +17,6 @@ ha_cluster_exporter
 # we don't use vendoring
 /vendor
 /build
+
+# ignore tmp promu config
+.promu.release.yml
diff --git a/.promu.yml b/.promu.yml
new file mode 100644
index 0000000..fbd4120
--- /dev/null
+++ b/.promu.yml
@@ -0,0 +1,21 @@
+go:
+    version: 1.16
+    cgo: false
+repository:
+    path: github.com/ClusterLabs/ha_cluster_exporter
+build:
+    flags: -a -tags netgo
+    ldflags: |
+        -X github.com/prometheus/common/version.Version={{.Version}}
+        -X github.com/prometheus/common/version.Revision={{.Revision}}
+        -X github.com/prometheus/common/version.Branch={{.Branch}}
+        -X github.com/prometheus/common/version.BuildUser={{user}}@{{host}}
+        -X github.com/prometheus/common/version.BuildDate={{date "20060102-15:04:05"}}
+    binaries:
+        - name: ha_cluster_exporter-amd64
+        - name: ha_cluster_exporter-arm64
+        - name: ha_cluster_exporter-ppc64le
+        - name: ha_cluster_exporter-s390x
+tarball:
+    files:
+        - LICENSE
diff --git a/Makefile b/Makefile
index fdde061..d30b097 100644
--- a/Makefile
+++ b/Makefile
@@ -1,9 +1,20 @@
+GO    := GO111MODULE=on go
+FIRST_GOPATH := $(firstword $(subst :, ,$(shell $(GO) env GOPATH)))
+GOHOSTOS     ?= $(shell $(GO) env GOHOSTOS)
+GOHOSTARCH   ?= $(shell $(GO) env GOHOSTARCH)
+ifeq (arm, $(GOHOSTARCH))
+	GOHOSTARM ?= $(shell GOARM= $(GO) env GOARM)
+	GO_BUILD_PLATFORM ?= $(GOHOSTOS)-$(GOHOSTARCH)v$(GOHOSTARM)
+else
+	GO_BUILD_PLATFORM ?= $(GOHOSTOS)-$(GOHOSTARCH)
+endif
+PROMU        := $(FIRST_GOPATH)/bin/promu
+PROMU_VERSION ?= 0.13.0
+PROMU_URL     := https://github.com/prometheus/promu/releases/download/v$(PROMU_VERSION)/promu-$(PROMU_VERSION).$(GO_BUILD_PLATFORM).tar.gz
+
 # this is the what ends up in the RPM "Version" field and embedded in the --version CLI flag
 VERSION ?= $(shell .ci/get_version_from_git.sh)
 
-# this will be used as the build date by the Go compile task
-DATE = $(shell date --iso-8601=seconds)
-
 # if you want to release to OBS, this must be a remotely available Git reference
 REVISION ?= $(shell git rev-parse --abbrev-ref HEAD)
 
@@ -19,47 +30,65 @@ ARCHS ?= amd64 arm64 ppc64le s390x
 
 default: clean mod-tidy generate fmt vet-check test build
 
-build: amd64
+promu-prepare: 
+	sed "s/{{.Version}}/$(VERSION)/" .promu.yml >.promu.release.yml
+	mkdir -p build/bin
+
+# from https://github.com/prometheus/prometheus/blob/main/Makefile.common
+$(PROMU):
+	$(eval PROMU_TMP := $(shell mktemp -d))
+	curl -s -L $(PROMU_URL) | tar -xvzf - -C $(PROMU_TMP)
+	mkdir -p $(FIRST_GOPATH)/bin
+	cp $(PROMU_TMP)/promu-$(PROMU_VERSION).$(GO_BUILD_PLATFORM)/promu $(FIRST_GOPATH)/bin/promu
+	rm -r $(PROMU_TMP)
+
+build:
+	$(MAKE) clean
+	$(MAKE) promu-prepare $(PROMU)
+	$(MAKE) amd64
 
-build-all: clean $(ARCHS)
+build-all:
+	$(MAKE) clean
+	$(MAKE) promu-prepare $(PROMU)
+	$(MAKE) $(ARCHS)
 
 $(ARCHS):
-	@mkdir -p build/bin
-	CGO_ENABLED=0 GOOS=linux GOARCH=$@ go build -trimpath -ldflags "-s -w -X main.version=$(VERSION) -X main.buildDate=$(DATE)" -o build/bin/ha_cluster_exporter-$@
+	GOOS=linux GOARCH=$@ $(PROMU) build --config .promu.release.yml --prefix=build/bin ha_cluster_exporter-$@
 
 install:
-	go install
+	$(GO) install
 
 static-checks: vet-check fmt-check
 
 vet-check:
-	go vet ./...
+	$(GO) vet ./...
 
 fmt:
-	go fmt ./...
+	$(GO) fmt ./...
 
 mod-tidy:
-	go mod tidy
+	$(GO) mod tidy
 
 fmt-check:
 	.ci/go_lint.sh
 
 generate:
-	go generate ./...
+	$(GO) generate ./...
 
 test:
-	go test -v ./...
+	$(GO) test -v ./...
 
 checks: static-checks test
 
 coverage:
 	@mkdir -p build
-	go test -cover -coverprofile=build/coverage ./...
-	go tool cover -html=build/coverage
+	$(GO) test -cover -coverprofile=build/coverage ./...
+	$(GO) tool cover -html=build/coverage
 
 clean:
-	go clean
+	$(GO) clean
 	rm -rf build
+	rm -f .promu.release.yml
 
 exporter-obs-workdir: build/obs/prometheus-ha_cluster_exporter
 build/obs/prometheus-ha_cluster_exporter:
diff --git a/README.md b/README.md
index dbf891c..34701b3 100644
--- a/README.md
+++ b/README.md
@@ -98,6 +98,47 @@ The first match has precedence, and the CLI flags have precedence over the confi
 
 Please refer to the example [YAML configuration](ha_cluster_exporter.yaml) for more details.
 
+Additional CLI flags can also be passed via `/etc/sysconfig/prometheus-ha_cluster_exporter`.
+
+#### General Flags
+
+Name                                       | Description
+----                                       | -----------
+web.listen-address                         | Address to listen on for web interface and telemetry (default `:9664`).
+web.telemetry-path                         | Path under which to expose metrics (default `/metrics`).
+web.config.file                            | Path to a [web configuration file](#tls-and-basic-authentication) (default `/etc/ha_cluster_exporter.web.yaml`).
+log.level                                  | Logging verbosity (default `info`).
+version                                    | Print the version information.
+
+##### Deprecated Flags
+Name                                       | Description
+----                                       | -----------
+address                                    | deprecated: please use --web.listen-address or --web.config.file to use Prometheus Exporter Toolkit
+port                                       | deprecated: please use --web.listen-address or --web.config.file to use Prometheus Exporter Toolkit
+log-level                                  | deprecated: please use log.level
+enable-timestamps                          | deprecated: server-side metric timestamping is discouraged by Prometheus best-practices and should be avoided
+
+#### Collector Flags
+
+Name                                       | Description
+----                                       | -----------
+crm-mon-path                               | Path to crm_mon executable (default `/usr/sbin/crm_mon`).
+cibadmin-path                              | Path to cibadmin executable (default `/usr/sbin/cibadmin`).
+corosync-cfgtoolpath-path                  | Path to corosync-cfgtool executable (default `/usr/sbin/corosync-cfgtool`).
+corosync-quorumtool-path                   | Path to corosync-quorumtool executable (default `/usr/sbin/corosync-quorumtool`).
+sbd-path                                   | Path to sbd executable (default `/usr/sbin/sbd`).
+sbd-config-path                            | Path to sbd configuration (default `/etc/sysconfig/sbd`).
+drbdsetup-path                             | Path to drbdsetup executable (default `/sbin/drbdsetup`).
+drbdsplitbrain-path                        | Path to drbd splitbrain hooks temporary files (default `/var/run/drbd/splitbrain`).
+
+### TLS and basic authentication
+
+The ha_cluster_exporter supports TLS and basic authentication.
+
+To use TLS and/or basic authentication, you need to pass a configuration file
+using the `--web.config.file` parameter. The format of the file is described
+[in the exporter-toolkit repository](https://github.com/prometheus/exporter-toolkit/blob/master/docs/web-configuration.md).
+
 ### systemd integration
 
 A [systemd unit file](ha_cluster_exporter.service) is provided with the RPM packages. You can enable and start it as usual:  
@@ -114,7 +155,7 @@ We recommend having a look at the [design document](doc/design.md) and the [deve
 
 ## License
 
-Copyright 2019-2020 SUSE LLC
+Copyright 2019-2022 SUSE LLC
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
diff --git a/collector/corosync/corosync.go b/collector/corosync/corosync.go
index 06d21a4..92b8037 100644
--- a/collector/corosync/corosync.go
+++ b/collector/corosync/corosync.go
@@ -3,23 +3,24 @@ package corosync
 import (
 	"os/exec"
 
+	"github.com/go-kit/log"
+	"github.com/go-kit/log/level"
 	"github.com/pkg/errors"
 	"github.com/prometheus/client_golang/prometheus"
-	log "github.com/sirupsen/logrus"
 
 	"github.com/ClusterLabs/ha_cluster_exporter/collector"
 )
 
 const subsystem = "corosync"
 
-func NewCollector(cfgToolPath string, quorumToolPath string) (*corosyncCollector, error) {
+func NewCollector(cfgToolPath string, quorumToolPath string, timestamps bool, logger log.Logger) (*corosyncCollector, error) {
 	err := collector.CheckExecutables(cfgToolPath, quorumToolPath)
 	if err != nil {
 		return nil, errors.Wrapf(err, "could not initialize '%s' collector", subsystem)
 	}
 
 	c := &corosyncCollector{
-		collector.NewDefaultCollector(subsystem),
+		collector.NewDefaultCollector(subsystem, timestamps, logger),
 		cfgToolPath,
 		quorumToolPath,
 		NewParser(),
@@ -41,7 +42,7 @@ type corosyncCollector struct {
 }
 
 func (c *corosyncCollector) CollectWithError(ch chan<- prometheus.Metric) error {
-	log.Debugln("Collecting corosync metrics...")
+	level.Debug(c.Logger).Log("msg", "Collecting corosync metrics...")
 
 	// We suppress the exec errors because if any interface is faulty the tools will exit with code 1, but we still want to parse the output.
 	cfgToolOutput, _ := exec.Command(c.cfgToolPath, "-s").Output()
@@ -62,9 +63,11 @@ func (c *corosyncCollector) CollectWithError(ch chan<- prometheus.Metric) error
 }
 
 func (c *corosyncCollector) Collect(ch chan<- prometheus.Metric) {
+	level.Debug(c.Logger).Log("msg", "Collecting corosync metrics...")
+
 	err := c.CollectWithError(ch)
 	if err != nil {
-		log.Warnf("'%s' collector scrape failed: %s", c.GetSubsystem(), err)
+		level.Warn(c.Logger).Log("msg", c.GetSubsystem()+" collector scrape failed", "err", err)
 	}
 }
 
diff --git a/collector/default_collector.go b/collector/default_collector.go
index 7b4d822..e14e62e 100644
--- a/collector/default_collector.go
+++ b/collector/default_collector.go
@@ -2,9 +2,9 @@ package collector
 
 import (
 	"github.com/ClusterLabs/ha_cluster_exporter/internal/clock"
+	"github.com/go-kit/log"
 	"github.com/pkg/errors"
 	"github.com/prometheus/client_golang/prometheus"
-	config "github.com/spf13/viper"
 	"os"
 )
 
@@ -18,13 +18,17 @@ type DefaultCollector struct {
 	subsystem   string
 	descriptors map[string]*prometheus.Desc
 	Clock       clock.Clock
+	timestamps  bool
+	Logger      log.Logger
 }
 
-func NewDefaultCollector(subsystem string) DefaultCollector {
+func NewDefaultCollector(subsystem string, timestamps bool, logger log.Logger) DefaultCollector {
 	return DefaultCollector{
 		subsystem,
 		make(map[string]*prometheus.Desc),
 		&clock.SystemClock{},
+		timestamps,
+		logger,
 	}
 }
 
@@ -67,7 +71,7 @@ func (c *DefaultCollector) MakeCounterMetric(name string, value float64, labelVa
 func (c *DefaultCollector) makeMetric(name string, value float64, valueType prometheus.ValueType, labelValues ...string) prometheus.Metric {
 	desc := c.GetDescriptor(name)
 	metric := prometheus.MustNewConstMetric(desc, valueType, value, labelValues...)
-	if config.GetBool("enable-timestamps") {
+	if c.timestamps == true {
 		metric = prometheus.NewMetricWithTimestamp(c.Clock.Now(), metric)
 	}
 	return metric
diff --git a/collector/drbd/drbd.go b/collector/drbd/drbd.go
index 12a96f9..f513603 100644
--- a/collector/drbd/drbd.go
+++ b/collector/drbd/drbd.go
@@ -8,9 +8,10 @@ import (
 	"strconv"
 	"strings"
 
+	"github.com/go-kit/log"
+	"github.com/go-kit/log/level"
 	"github.com/pkg/errors"
 	"github.com/prometheus/client_golang/prometheus"
-	log "github.com/sirupsen/logrus"
 
 	"github.com/ClusterLabs/ha_cluster_exporter/collector"
 )
@@ -47,14 +48,14 @@ type drbdStatus struct {
 	} `json:"connections"`
 }
 
-func NewCollector(drbdSetupPath string, drbdSplitBrainPath string) (*drbdCollector, error) {
+func NewCollector(drbdSetupPath string, drbdSplitBrainPath string, timestamps bool, logger log.Logger) (*drbdCollector, error) {
 	err := collector.CheckExecutables(drbdSetupPath)
 	if err != nil {
 		return nil, errors.Wrapf(err, "could not initialize '%s' collector", subsystem)
 	}
 
 	c := &drbdCollector{
-		collector.NewDefaultCollector(subsystem),
+		collector.NewDefaultCollector(subsystem, timestamps, logger),
 		drbdSetupPath,
 		drbdSplitBrainPath,
 	}
@@ -85,7 +86,7 @@ type drbdCollector struct {
 }
 
 func (c *drbdCollector) CollectWithError(ch chan<- prometheus.Metric) error {
-	log.Debugln("Collecting DRBD metrics...")
+	level.Debug(c.Logger).Log("msg", "Collecting DRBD metrics...")
 
 	c.recordDrbdSplitBrainMetric(ch)
 
@@ -117,13 +118,13 @@ func (c *drbdCollector) CollectWithError(ch chan<- prometheus.Metric) error {
 			}
 		}
 		if len(resource.Connections) == 0 {
-			log.Warnf("Could not retrieve connection info for resource '%s'\n", resource.Name)
+			level.Warn(c.Logger).Log("msg", "Could not retrieve connection info for resource "+resource.Name, "err", err)
 			continue
 		}
 		// a Resource can have multiple connection with different nodes
 		for _, conn := range resource.Connections {
 			if len(conn.PeerDevices) == 0 {
-				log.Warnf("Could not retrieve any peer device info for connection '%d'\n", conn.PeerNodeID)
+				level.Warn(c.Logger).Log("msg", "Could not retrieve any peer device info for connection "+resource.Name, "err", err)
 				continue
 			}
 			for _, peerDev := range conn.PeerDevices {
@@ -141,9 +142,11 @@ func (c *drbdCollector) CollectWithError(ch chan<- prometheus.Metric) error {
 }
 
 func (c *drbdCollector) Collect(ch chan<- prometheus.Metric) {
+	level.Debug(c.Logger).Log("msg", "Collecting DRBD metrics...")
+
 	err := c.CollectWithError(ch)
 	if err != nil {
-		log.Warnf("'%s' collector scrape failed: %s", c.GetSubsystem(), err)
+		level.Warn(c.Logger).Log("msg", c.GetSubsystem()+" collector scrape failed", "err", err)
 	}
 }
 
diff --git a/collector/instrumented_collector.go b/collector/instrumented_collector.go
index 79cc87f..79fa45b 100644
--- a/collector/instrumented_collector.go
+++ b/collector/instrumented_collector.go
@@ -1,13 +1,13 @@
 package collector
 
 import (
-	"github.com/prometheus/client_golang/prometheus"
-	log "github.com/sirupsen/logrus"
-
 	"github.com/ClusterLabs/ha_cluster_exporter/internal/clock"
+	"github.com/go-kit/log"
+	"github.com/go-kit/log/level"
+	"github.com/prometheus/client_golang/prometheus"
 )
 
-//go:generate mockgen -destination ../test/mock_collector/instrumented_collector.go github.com/ClusterLabs/ha_cluster_exporter/collector InstrumentableCollector
+//go:generate go run -mod=mod github.com/golang/mock/mockgen --build_flags=-mod=mod -package mock_collector -destination ../test/mock_collector/instrumented_collector.go github.com/ClusterLabs/ha_cluster_exporter/collector InstrumentableCollector
 
 // describes a collector that can return errors from collection cycles,
 // instead of the default Prometheus one, which has void Collect returns
@@ -22,9 +22,10 @@ type InstrumentedCollector struct {
 	Clock              clock.Clock
 	scrapeDurationDesc *prometheus.Desc
 	scrapeSuccessDesc  *prometheus.Desc
+	logger             log.Logger
 }
 
-func NewInstrumentedCollector(collector InstrumentableCollector) *InstrumentedCollector {
+func NewInstrumentedCollector(collector InstrumentableCollector, logger log.Logger) *InstrumentedCollector {
 	return &InstrumentedCollector{
 		collector,
 		&clock.SystemClock{},
@@ -44,6 +45,7 @@ func NewInstrumentedCollector(collector InstrumentableCollector) *InstrumentedCo
 				"collector": collector.GetSubsystem(),
 			},
 		),
+		logger,
 	}
 }
 
@@ -55,7 +57,7 @@ func (ic *InstrumentedCollector) Collect(ch chan<- prometheus.Metric) {
 	if err == nil {
 		success = 1
 	} else {
-		log.Warnf("'%s' collector scrape failed: %s", ic.collector.GetSubsystem(), err)
+		level.Warn(ic.logger).Log("msg", ic.collector.GetSubsystem()+" collector scrape failed", "err", err)
 	}
 	ch <- prometheus.MustNewConstMetric(ic.scrapeDurationDesc, prometheus.GaugeValue, duration.Seconds())
 	ch <- prometheus.MustNewConstMetric(ic.scrapeSuccessDesc, prometheus.GaugeValue, success)
diff --git a/collector/pacemaker/pacemaker.go b/collector/pacemaker/pacemaker.go
index 547f639..ee7651c 100644
--- a/collector/pacemaker/pacemaker.go
+++ b/collector/pacemaker/pacemaker.go
@@ -10,21 +10,22 @@ import (
 	"github.com/ClusterLabs/ha_cluster_exporter/collector/pacemaker/cib"
 	"github.com/ClusterLabs/ha_cluster_exporter/collector/pacemaker/crmmon"
 
+	"github.com/go-kit/log"
+	"github.com/go-kit/log/level"
 	"github.com/pkg/errors"
 	"github.com/prometheus/client_golang/prometheus"
-	log "github.com/sirupsen/logrus"
 )
 
 const subsystem = "pacemaker"
 
-func NewCollector(crmMonPath string, cibAdminPath string) (*pacemakerCollector, error) {
+func NewCollector(crmMonPath string, cibAdminPath string, timestamps bool, logger log.Logger) (*pacemakerCollector, error) {
 	err := collector.CheckExecutables(crmMonPath, cibAdminPath)
 	if err != nil {
 		return nil, errors.Wrapf(err, "could not initialize '%s' collector", subsystem)
 	}
 
 	c := &pacemakerCollector{
-		collector.NewDefaultCollector(subsystem),
+		collector.NewDefaultCollector(subsystem, timestamps, logger),
 		crmmon.NewCrmMonParser(crmMonPath),
 		cib.NewCibAdminParser(cibAdminPath),
 	}
@@ -47,7 +48,7 @@ type pacemakerCollector struct {
 }
 
 func (c *pacemakerCollector) CollectWithError(ch chan<- prometheus.Metric) error {
-	log.Debugln("Collecting pacemaker metrics...")
+	level.Debug(c.Logger).Log("msg", "Collecting pacemaker metrics...")
 
 	crmMon, err := c.crmMonParser.Parse()
 	if err != nil {
@@ -76,9 +77,11 @@ func (c *pacemakerCollector) CollectWithError(ch chan<- prometheus.Metric) error
 }
 
 func (c *pacemakerCollector) Collect(ch chan<- prometheus.Metric) {
+	level.Debug(c.Logger).Log("msg", "Collecting pacemaker metrics...")
+
 	err := c.CollectWithError(ch)
 	if err != nil {
-		log.Warnf("'%s' collector scrape failed: %s", c.GetSubsystem(), err)
+		level.Warn(c.Logger).Log("msg", c.GetSubsystem()+" collector scrape failed", "err", err)
 	}
 }
 
diff --git a/collector/sbd/sbd.go b/collector/sbd/sbd.go
index ea79f4b..476f5c0 100644
--- a/collector/sbd/sbd.go
+++ b/collector/sbd/sbd.go
@@ -9,9 +9,10 @@ import (
 	"strconv"
 	"strings"
 
+	"github.com/go-kit/log"
+	"github.com/go-kit/log/level"
 	"github.com/pkg/errors"
 	"github.com/prometheus/client_golang/prometheus"
-	log "github.com/sirupsen/logrus"
 
 	"github.com/ClusterLabs/ha_cluster_exporter/collector"
 )
@@ -22,14 +23,14 @@ const SBD_STATUS_UNHEALTHY = "unhealthy"
 const SBD_STATUS_HEALTHY = "healthy"
 
 // NewCollector create a new sbd collector
-func NewCollector(sbdPath string, sbdConfigPath string) (*sbdCollector, error) {
+func NewCollector(sbdPath string, sbdConfigPath string, timestamps bool, logger log.Logger) (*sbdCollector, error) {
 	err := checkArguments(sbdPath, sbdConfigPath)
 	if err != nil {
 		return nil, errors.Wrapf(err, "could not initialize '%s' collector", subsystem)
 	}
 
 	c := &sbdCollector{
-		collector.NewDefaultCollector("sbd"),
+		collector.NewDefaultCollector(subsystem, timestamps, logger),
 		sbdPath,
 		sbdConfigPath,
 	}
@@ -57,7 +58,7 @@ type sbdCollector struct {
 }
 
 func (c *sbdCollector) CollectWithError(ch chan<- prometheus.Metric) error {
-	log.Debugln("Collecting SBD metrics...")
+	level.Debug(c.Logger).Log("msg", "Collecting pacemaker metrics...")
 
 	sbdConfiguration, err := readSdbFile(c.sbdConfigPath)
 	if err != nil {
@@ -84,9 +85,11 @@ func (c *sbdCollector) CollectWithError(ch chan<- prometheus.Metric) error {
 }
 
 func (c *sbdCollector) Collect(ch chan<- prometheus.Metric) {
+	level.Debug(c.Logger).Log("msg", "Collecting pacemaker metrics...")
+
 	err := c.CollectWithError(ch)
 	if err != nil {
-		log.Warnf("'%s' collector scrape failed: %s", c.GetSubsystem(), err)
+		level.Warn(c.Logger).Log("msg", c.GetSubsystem()+" collector scrape failed", "err", err)
 	}
 }
 
diff --git a/go.mod b/go.mod
index d501963..d2a89d4 100644
--- a/go.mod
+++ b/go.mod
@@ -1,14 +1,16 @@
 module github.com/ClusterLabs/ha_cluster_exporter
 
-go 1.14
+go 1.16
 
 require (
-	github.com/golang/mock v1.5.0
+	github.com/go-kit/log v0.2.1
+	github.com/golang/mock v1.6.0
 	github.com/pkg/errors v0.9.1
-	github.com/prometheus/client_golang v1.10.0
+	github.com/prometheus/client_golang v1.12.2
 	github.com/prometheus/client_model v0.2.0
-	github.com/sirupsen/logrus v1.8.1
-	github.com/spf13/pflag v1.0.5
-	github.com/spf13/viper v1.7.1
-	github.com/stretchr/testify v1.7.0
+	github.com/prometheus/common v0.34.0
+	github.com/prometheus/exporter-toolkit v0.7.1
+	github.com/spf13/viper v1.11.0
+	github.com/stretchr/testify v1.7.1
+	gopkg.in/alecthomas/kingpin.v2 v2.2.6
 )
diff --git a/go.sum b/go.sum
index 282dbb9..8b42640 100644
--- a/go.sum
+++ b/go.sum
@@ -3,371 +3,419 @@ cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMT
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diff --git a/ha_cluster_exporter.go b/ha_cluster_exporter.go
index 665d48a..37b7b41 100644
--- a/ha_cluster_exporter.go
+++ b/ha_cluster_exporter.go
@@ -4,124 +4,205 @@ import (
 	"fmt"
 	"net/http"
 	"os"
-	"runtime"
+	"strings"
 
+	"github.com/go-kit/log"
+	"github.com/go-kit/log/level"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
-	log "github.com/sirupsen/logrus"
-	flag "github.com/spf13/pflag"
+	"github.com/prometheus/common/promlog"
+	// cannot use as setConfigDefault function will not work here
+	// log.level and log.format flags are set in vars/init
+	// "github.com/prometheus/common/promlog/flag"
+	"github.com/prometheus/common/version"
+	"github.com/prometheus/exporter-toolkit/web"
+
 	"github.com/spf13/viper"
+	// we could use this but want to define our own defaults
+	// webflag "github.com/prometheus/exporter-toolkit/web/kingpinflag"
+	"gopkg.in/alecthomas/kingpin.v2"
 
 	"github.com/ClusterLabs/ha_cluster_exporter/collector"
 	"github.com/ClusterLabs/ha_cluster_exporter/collector/corosync"
 	"github.com/ClusterLabs/ha_cluster_exporter/collector/drbd"
 	"github.com/ClusterLabs/ha_cluster_exporter/collector/pacemaker"
 	"github.com/ClusterLabs/ha_cluster_exporter/collector/sbd"
-	"github.com/ClusterLabs/ha_cluster_exporter/internal"
 )
 
-var (
-	// the released version
-	version string
-	// the time the binary was built
-	buildDate string
-	// global --help flag
-	helpFlag *bool
-	// global --version flag
-	versionFlag *bool
+const (
+	namespace = "ha_cluster_exporter"
+)
 
+var (
 	config *viper.Viper
+
+	// general flags
+	webListenAddress *string
+	webTelemetryPath *string
+	webConfig        *string
+	logLevel         *string
+	logFormat        *string
+
+	// collector flags
+	haClusterCrmMonPath              *string
+	haClusterCibadminPath            *string
+	haClusterCorosyncCfgtoolpathPath *string
+	haClusterCorosyncQuorumtoolPath  *string
+	haClusterSbdPath                 *string
+	haClusterSbdConfigPath           *string
+	haClusterDrbdsetupPath           *string
+	haClusterDrbdsplitbrainPath      *string
+
+	// deprecated flags
+	enableTimestampsDeprecated *bool
+	portDeprecated             *int
+	addressDeprecated          *string
+	logLevelDeprecated         *string
+
+	promlogConfig = &promlog.Config{
+		Level:  &promlog.AllowedLevel{},
+		Format: &promlog.AllowedFormat{},
+	}
 )
 
 func init() {
+
 	config = viper.New()
 	config.SetConfigName("ha_cluster_exporter")
 	config.AddConfigPath("./")
 	config.AddConfigPath("$HOME/.config/")
 	config.AddConfigPath("/etc/")
 	config.AddConfigPath("/usr/etc/")
+	config.ReadInConfig()
 
-	flag.String("port", "9664", "The port number to listen on for HTTP requests")
-	flag.String("address", "0.0.0.0", "The address to listen on for HTTP requests")
-	flag.String("log-level", "info", "The minimum logging level; levels are, in ascending order: debug, info, warn, error")
-	flag.String("crm-mon-path", "/usr/sbin/crm_mon", "path to crm_mon executable")
-	flag.String("cibadmin-path", "/usr/sbin/cibadmin", "path to cibadmin executable")
-	flag.String("corosync-cfgtoolpath-path", "/usr/sbin/corosync-cfgtool", "path to corosync-cfgtool executable")
-	flag.String("corosync-quorumtool-path", "/usr/sbin/corosync-quorumtool", "path to corosync-quorumtool executable")
-	flag.String("sbd-path", "/usr/sbin/sbd", "path to sbd executable")
-	flag.String("sbd-config-path", "/etc/sysconfig/sbd", "path to sbd configuration")
-	flag.String("drbdsetup-path", "/sbin/drbdsetup", "path to drbdsetup executable")
-	flag.String("drbdsplitbrain-path", "/var/run/drbd/splitbrain", "path to drbd splitbrain hooks temporary files")
-	flag.Bool("enable-timestamps", false, "Add the timestamp to every metric line")
-	flag.CommandLine.MarkDeprecated("enable-timestamps", "server-side metric timestamping is discouraged by Prometheus best-practices and should be avoided")
-	flag.CommandLine.SortFlags = false
-
-	err := config.BindPFlags(flag.CommandLine)
-	if err != nil {
-		log.Fatalf("Could not bind config to CLI flags: %v", err)
-	}
+	// general flags
+	webListenAddress = kingpin.Flag(
+		"web.listen-address",
+		"Address to listen on for web interface and telemetry.",
+	).PlaceHolder(":9664").Default(setConfigDefault("web.listen-address", ":9664")).String()
+	webTelemetryPath = kingpin.Flag(
+		"web.telemetry-path",
+		"Path under which to expose metrics.",
+	).PlaceHolder("/metrics").Default(setConfigDefault("web.telemetry-path", "/metrics")).String()
+	// we could use this but want to define our own defaults
+	// webConfig = webflag.AddFlags(kingpin.CommandLine)
+	webConfig = kingpin.Flag(
+		"web.config.file",
+		"[EXPERIMENTAL] Path to configuration file that can enable TLS or authentication.",
+	).PlaceHolder("/etc/" + namespace + ".web.yaml").Default(setConfigDefault("web.config.file", "/etc/"+namespace+".web.yaml")).String()
 
-	helpFlag = flag.BoolP("help", "h", false, "show this help message")
-	versionFlag = flag.Bool("version", false, "show version and build information")
-}
+	// collector flags
+	haClusterCrmMonPath = kingpin.Flag(
+		"crm-mon-path",
+		"path to crm_mon executable",
+	).PlaceHolder("/usr/sbin/crm_mon").Default(setConfigDefault("crm-mon-path", "/usr/sbin/crm_mon")).String()
+	haClusterCibadminPath = kingpin.Flag(
+		"cibadmin-path",
+		"path to cibadmin executable",
+	).PlaceHolder("/usr/sbin/cibadmin").Default(setConfigDefault("cibadmin-path", "/usr/sbin/cibadmin")).String()
+	haClusterCorosyncCfgtoolpathPath = kingpin.Flag(
+		"corosync-cfgtoolpath-path",
+		"path to corosync-cfgtool executable",
+	).PlaceHolder("/usr/sbin/corosync-cfgtool").Default(setConfigDefault("corosync-cfgtoolpath-path", "/usr/sbin/corosync-cfgtool")).String()
+	haClusterCorosyncQuorumtoolPath = kingpin.Flag(
+		"corosync-quorumtool-path",
+		"path to corosync-quorumtool executable",
+	).PlaceHolder("/usr/sbin/corosync-quorumtool").Default(setConfigDefault("corosync-quorumtool-path", "/usr/sbin/corosync-quorumtool")).String()
+	haClusterSbdPath = kingpin.Flag(
+		"sbd-path",
+		"path to sbd executable",
+	).PlaceHolder("/usr/sbin/sbd").Default(setConfigDefault("sbd-path", "/usr/sbin/sbd")).String()
+	haClusterSbdConfigPath = kingpin.Flag(
+		"sbd-config-path",
+		"path to sbd configuration",
+	).PlaceHolder("/etc/sysconfig/sbd").Default(setConfigDefault("sbd-config-path", "/etc/sysconfig/sbd")).String()
+	haClusterDrbdsetupPath = kingpin.Flag(
+		"drbdsetup-path",
+		"path to drbdsetup executable",
+	).PlaceHolder("/sbin/drbdsetup").Default(setConfigDefault("drbdsetup-path", "/sbin/drbdsetup")).String()
+	haClusterDrbdsplitbrainPath = kingpin.Flag(
+		"drbdsplitbrain-path",
+		"path to drbd splitbrain hooks temporary files",
+	).PlaceHolder("/var/run/drbd/splitbrain").Default(setConfigDefault("drbdsplitbrain-path", "/var/run/drbd/splitbrain")).String()
+	enableTimestampsDeprecated = kingpin.Flag(
+		"enable-timestamps",
+		"[DEPRECATED] server-side metric timestamping is discouraged by Prometheus best-practices and should be avoided",
+	).PlaceHolder("false").Default(setConfigDefault("enable-timestamps", "false")).Bool()
+	addressDeprecated = kingpin.Flag(
+		"address",
+		"[DEPRECATED] please use --web.listen-address or --web.config.file to use Prometheus Exporter Toolkit",
+	).PlaceHolder("0.0.0.0").Default(setConfigDefault("address", "0.0.0.0")).String()
+	portDeprecated = kingpin.Flag(
+		"port",
+		"[DEPRECATED] please use --web.listen-address or --web.config.file to use Prometheus Exporter Toolkit",
+	).PlaceHolder("9664").Default(setConfigDefault("port", "9664")).Int()
+	logLevelDeprecated = kingpin.Flag(
+		"log-level",
+		"[DEPRECATED] please user log.level",
+	).PlaceHolder("info").Default(setConfigDefault("log-level", "info")).String()
 
-func main() {
-	flag.Parse()
+	// cannot use as setConfigDefault function will not work here
+	// log.level and log.format flags are set in vars/init
+	// flag.AddFlags(kingpin.CommandLine, promlogConfig)
+	logLevel = kingpin.Flag(
+		"log.level",
+		"Only log messages with the given severity or above. One of: [debug, info, warn, error]",
+	).PlaceHolder("info").Default(setConfigDefault("log.level", "info")).String()
+	logFormat = kingpin.Flag(
+		"log.format",
+		"Output format of log messages. One of: [logfmt, json]",
+	).PlaceHolder("logfmt").Default(setConfigDefault("log.format", "logfmt")).String()
 
-	switch {
-	case *helpFlag:
-		showHelp()
-	case *versionFlag:
-		showVersion()
-	default:
-		run()
+	// detect unit testing and skip kingpin.Parse() in init.
+	// see: https://github.com/alecthomas/kingpin/issues/187
+	testing := (strings.HasSuffix(os.Args[0], ".test") ||
+		strings.HasSuffix(os.Args[0], "__debug_bin"))
+	if testing {
+		return
 	}
-}
 
-func run() {
-	var err error
+	kingpin.Version(version.Print(namespace))
+	kingpin.HelpFlag.Short('h')
 
-	err = config.ReadInConfig()
-	if err != nil {
-		log.Warn(err)
-		log.Info("Default config values will be used")
-	} else {
-		log.Info("Using config file: ", config.ConfigFileUsed())
-	}
+	var err error
 
-	internal.SetLogLevel(config.GetString("log-level"))
+	kingpin.Parse()
 
-	collectors, errors := registerCollectors(config)
-	for _, err = range errors {
-		log.Warn("Registration failure: ", err)
+	// use deprecated log-level parameter if set
+	if *logLevelDeprecated != "info" {
+		*logLevel = *logLevelDeprecated
 	}
-	if len(collectors) == 0 {
-		log.Fatal("No collector could be registered.")
+
+	err = promlogConfig.Level.Set(*logLevel)
+	if err != nil {
+		fmt.Printf("%s: error: %s, try --help\n", namespace, err)
+		os.Exit(1)
 	}
-	for _, c := range collectors {
-		if c, ok := c.(collector.SubsystemCollector); ok == true {
-			log.Infof("'%s' collector registered.", c.GetSubsystem())
-		}
+	err = promlogConfig.Format.Set(*logFormat)
+	if err != nil {
+		fmt.Printf("%s: error: %s, try --help\n", namespace, err)
+		os.Exit(1)
 	}
+}
 
-	// if we're not in debug log level, we unregister the Go runtime metrics collector that gets registered by default
-	if !log.IsLevelEnabled(log.DebugLevel) {
-		prometheus.Unregister(prometheus.NewGoCollector())
+// looks up if a configName is define in viper config
+// if it is not defined in the viper config, set the passed configDefault
+func setConfigDefault(configName string, configDefault string) string {
+	var result string
+	if config.IsSet(configName) {
+		result = config.GetString(configName)
+	} else {
+		result = configDefault
 	}
-
-	fullListenAddress := fmt.Sprintf("%s:%s", config.Get("address"), config.Get("port"))
-
-	http.HandleFunc("/", internal.Landing)
-	http.Handle("/metrics", promhttp.Handler())
-
-	log.Infof("Serving metrics on %s", fullListenAddress)
-	log.Fatal(http.ListenAndServe(fullListenAddress, nil))
+	return result
 }
 
-func registerCollectors(config *viper.Viper) (collectors []prometheus.Collector, errors []error) {
+func registerCollectors(logger log.Logger) (collectors []prometheus.Collector, errors []error) {
 	pacemakerCollector, err := pacemaker.NewCollector(
-		config.GetString("crm-mon-path"),
-		config.GetString("cibadmin-path"),
+		*haClusterCrmMonPath,
+		*haClusterCibadminPath,
+		*enableTimestampsDeprecated,
+		logger,
 	)
 	if err != nil {
 		errors = append(errors, err)
@@ -130,8 +211,10 @@ func registerCollectors(config *viper.Viper) (collectors []prometheus.Collector,
 	}
 
 	corosyncCollector, err := corosync.NewCollector(
-		config.GetString("corosync-cfgtoolpath-path"),
-		config.GetString("corosync-quorumtool-path"),
+		*haClusterCorosyncCfgtoolpathPath,
+		*haClusterCorosyncQuorumtoolPath,
+		*enableTimestampsDeprecated,
+		logger,
 	)
 	if err != nil {
 		errors = append(errors, err)
@@ -140,8 +223,10 @@ func registerCollectors(config *viper.Viper) (collectors []prometheus.Collector,
 	}
 
 	sbdCollector, err := sbd.NewCollector(
-		config.GetString("sbd-path"),
-		config.GetString("sbd-config-path"),
+		*haClusterSbdPath,
+		*haClusterSbdConfigPath,
+		*enableTimestampsDeprecated,
+		logger,
 	)
 	if err != nil {
 		errors = append(errors, err)
@@ -150,8 +235,10 @@ func registerCollectors(config *viper.Viper) (collectors []prometheus.Collector,
 	}
 
 	drbdCollector, err := drbd.NewCollector(
-		config.GetString("drbdsetup-path"),
-		config.GetString("drbdsplitbrain-path"),
+		*haClusterDrbdsetupPath,
+		*haClusterDrbdsplitbrainPath,
+		*enableTimestampsDeprecated,
+		logger,
 	)
 	if err != nil {
 		errors = append(errors, err)
@@ -161,7 +248,7 @@ func registerCollectors(config *viper.Viper) (collectors []prometheus.Collector,
 
 	for i, c := range collectors {
 		if c, ok := c.(collector.InstrumentableCollector); ok == true {
-			collectors[i] = collector.NewInstrumentedCollector(c)
+			collectors[i] = collector.NewInstrumentedCollector(c, logger)
 		}
 	}
 
@@ -170,15 +257,89 @@ func registerCollectors(config *viper.Viper) (collectors []prometheus.Collector,
 	return collectors, errors
 }
 
-func showHelp() {
-	flag.Usage()
-	os.Exit(0)
-}
+func main() {
+	var err error
+
+	logger := promlog.New(promlogConfig)
+
+	level.Info(logger).Log("msg", fmt.Sprintf("Starting %s %s", namespace, version.Info()))
+	level.Info(logger).Log("msg", fmt.Sprintf("Build context %s", version.BuildContext()))
+
+	// re-read only to display Info/Warn
+	err = config.ReadInConfig()
+	if err != nil {
+		level.Warn(logger).Log("msg", "Reading config file failed", "err", err)
+		level.Info(logger).Log("msg", "Default config values will be used")
+	} else {
+		level.Info(logger).Log("msg", "Using config file: "+config.ConfigFileUsed())
+	}
+
+	// register collectors
+	collectors, errors := registerCollectors(logger)
+	for _, err = range errors {
+		level.Warn(logger).Log("msg", "Registration failure", "err", err)
+	}
+	if len(collectors) == 0 {
+		level.Error(logger).Log("msg", "No collector could be registered.", "err", err)
+		os.Exit(1)
+	}
+	for _, c := range collectors {
+		if c, ok := c.(collector.SubsystemCollector); ok == true {
+			level.Info(logger).Log("msg", c.GetSubsystem()+" collector registered.")
+		}
+	}
+
+	// if we're not in debug log level, we unregister the Go runtime metrics collector that gets registered by default
+	if *logLevel != "debug" {
+		prometheus.Unregister(prometheus.NewGoCollector())
+	}
+
+	var fullListenAddress string
+	// use deprecated parameters
+	if *addressDeprecated != "0.0.0.0" || *portDeprecated != 9664 {
+		fullListenAddress = fmt.Sprintf("%s:%d", *addressDeprecated, *portDeprecated)
+		// use new parameters
+	} else {
+		fullListenAddress = *webListenAddress
+	}
+	serveAddress := &http.Server{Addr: fullListenAddress}
+	servePath := *webTelemetryPath
+
+	var landingPage = []byte(`<html>
+<head>
+	<title>ClusterLabs Linux HA Cluster Exporter</title>
+</head>
+<body>
+	<h1>ClusterLabs Linux HA Cluster Exporter</h1>
+	<h2>Prometheus exporter for Pacemaker based Linux HA clusters</h2>
+	<ul>
+		<li><a href="` + servePath + `">Metrics</a></li>
+		<li><a href="https://github.com/ClusterLabs/ha_cluster_exporter" target="_blank">GitHub</a></li>
+	</ul>
+</body>
+</html>
+`)
+
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		w.Write(landingPage)
+	})
+	http.Handle(servePath, promhttp.Handler())
+
+	level.Info(logger).Log("msg", "Serving metrics on "+fullListenAddress+servePath)
+
+	var listen error
+	_, err = os.Stat(*webConfig)
+	if err != nil {
+		level.Warn(logger).Log("msg", "Reading web config file failed", "err", err)
+		level.Info(logger).Log("msg", "Default web config or commandline values will be used")
+		listen = web.ListenAndServe(serveAddress, "", logger)
+	} else {
+		level.Info(logger).Log("msg", "Using web config file: "+*webConfig)
+		listen = web.ListenAndServe(serveAddress, *webConfig, logger)
+	}
 
-func showVersion() {
-	if buildDate == "" {
-		buildDate = "at unknown time"
+	if err := listen; err != nil {
+		level.Error(logger).Log("msg", "Error starting HTTP server", "err", err)
+		os.Exit(1)
 	}
-	fmt.Printf("version %s\nbuilt with %s %s/%s %s\n", version, runtime.Version(), runtime.GOOS, runtime.GOARCH, buildDate)
-	os.Exit(0)
 }
diff --git a/ha_cluster_exporter.service b/ha_cluster_exporter.service
index fbfb94e..0f31dfd 100644
--- a/ha_cluster_exporter.service
+++ b/ha_cluster_exporter.service
@@ -5,7 +5,8 @@ After=network.target
 [Service]
 Type=simple
 Restart=always
-ExecStart=/usr/bin/ha_cluster_exporter
+EnvironmentFile=-/etc/sysconfig/prometheus-ha_cluster_exporter
+ExecStart=/usr/bin/ha_cluster_exporter $ARGS
 ExecReload=/bin/kill -HUP $MAINPID
 
 [Install]
diff --git a/ha_cluster_exporter.sysconfig b/ha_cluster_exporter.sysconfig
new file mode 100644
index 0000000..9ac0f82
--- /dev/null
+++ b/ha_cluster_exporter.sysconfig
@@ -0,0 +1,11 @@
+## Path:        Network/Monitors/Prometheus/ha_cluster_exporter
+## Description: Prometheus ha_cluster_exporter startup parameters
+## Type:        string
+## Default:     ''
+#
+# Additional arguments for the ha_cluster_exporter.
+# Please call: /usr/bin/ha_cluster_exporter --help
+# for a full list of possible options. 
+# Note: Please keep the list on one line, of possible.
+#
+ARGS=''
diff --git a/ha_cluster_exporter.yaml b/ha_cluster_exporter.yaml
index 2ab57fb..ec63c7d 100644
--- a/ha_cluster_exporter.yaml
+++ b/ha_cluster_exporter.yaml
@@ -1,7 +1,12 @@
 # sample config
-port: "9664"
-address: "0.0.0.0"
-log-level: "info"
+web:
+  listen-address: "0.0.0.0:9664"
+  telemetry-path: "/metrics"
+  config:
+    file: "/etc/ha_cluster_exporter.web.yaml"
+log:
+  level: "info"
+  format: "logfmt"
 crm-mon-path: "/usr/sbin/crm_mon"
 cibadmin-path: "/usr/sbin/cibadmin"
 corosync-cfgtoolpath-path: "/usr/sbin/corosync-cfgtool"
@@ -9,4 +14,3 @@ corosync-quorumtool-path: "/usr/sbin/corosync-quorumtool"
 sbd-path: "/usr/sbin/sbd"
 sbd-config-path: "/etc/sysconfig/sbd"
 drbdsetup-path: "/sbin/drbdsetup"
-enable-timestamps: false
diff --git a/internal/landing.go b/internal/landing.go
deleted file mode 100644
index 667850a..0000000
--- a/internal/landing.go
+++ /dev/null
@@ -1,21 +0,0 @@
-package internal
-
-import "net/http"
-
-func Landing(w http.ResponseWriter, r *http.Request) {
-	w.Write([]byte(`
-<html>
-<head>
-	<title>ClusterLabs Linux HA Cluster Exporter</title>
-</head>
-<body>
-	<h1>ClusterLabs Linux HA Cluster Exporter</h1>
-	<h2>Prometheus exporter for Pacemaker based Linux HA clusters</h2>
-	<ul>
-		<li><a href="metrics">Metrics</a></li>
-		<li><a href="https://github.com/ClusterLabs/ha_cluster_exporter" target="_blank">GitHub</a></li>
-	</ul>
-</body>
-</html>
-`))
-}
diff --git a/internal/log.go b/internal/log.go
deleted file mode 100644
index 7f59ff6..0000000
--- a/internal/log.go
+++ /dev/null
@@ -1,18 +0,0 @@
-package internal
-
-import log "github.com/sirupsen/logrus"
-
-func SetLogLevel(level string) {
-	switch level {
-	case "error":
-		log.SetLevel(log.ErrorLevel)
-	case "warn":
-		log.SetLevel(log.WarnLevel)
-	case "info":
-		log.SetLevel(log.InfoLevel)
-	case "debug":
-		log.SetLevel(log.DebugLevel)
-	default:
-		log.Warnln("Unrecognized minimum log level; using 'info' as default")
-	}
-}
diff --git a/packaging/obs/grafana-ha-cluster-dashboards/_service b/packaging/obs/grafana-ha-cluster-dashboards/_service
index edcb2f8..91c1a46 100644
--- a/packaging/obs/grafana-ha-cluster-dashboards/_service
+++ b/packaging/obs/grafana-ha-cluster-dashboards/_service
@@ -1,6 +1,6 @@
 <services>
     <service name="tar_scm" mode="disabled">
-        <param name="url">git://github.com/%%REPOSITORY%%.git</param>
+        <param name="url">https://github.com/%%REPOSITORY%%.git</param>
         <param name="scm">git</param>
         <param name="revision">%%REVISION%%</param>
         <param name="include">dashboards</param>
diff --git a/packaging/obs/prometheus-ha_cluster_exporter/_service b/packaging/obs/prometheus-ha_cluster_exporter/_service
index 06b7440..878cb6b 100644
--- a/packaging/obs/prometheus-ha_cluster_exporter/_service
+++ b/packaging/obs/prometheus-ha_cluster_exporter/_service
@@ -1,6 +1,6 @@
 <services>
     <service name="tar_scm" mode="disabled">
-        <param name="url">git://github.com/%%REPOSITORY%%.git</param>
+        <param name="url">https://github.com/%%REPOSITORY%%.git</param>
         <param name="scm">git</param>
         <param name="revision">%%REVISION%%</param>
         <param name="exclude">.git</param>
diff --git a/packaging/obs/prometheus-ha_cluster_exporter/prometheus-ha_cluster_exporter.spec b/packaging/obs/prometheus-ha_cluster_exporter/prometheus-ha_cluster_exporter.spec
index fb75106..a5f95b2 100644
--- a/packaging/obs/prometheus-ha_cluster_exporter/prometheus-ha_cluster_exporter.spec
+++ b/packaging/obs/prometheus-ha_cluster_exporter/prometheus-ha_cluster_exporter.spec
@@ -1,5 +1,5 @@
 #
-# Copyright 2019-2021 SUSE LLC
+# Copyright 2019-2022 SUSE LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -27,10 +27,15 @@ Source:         %{name}-%{version}.tar.gz
 Source1:        vendor.tar.gz
 BuildRequires:  golang(API) >= 1.14
 BuildRequires:  golang-packaging
+Requires(post): %fillup_prereq
 Provides:       ha_cluster_exporter = %{version}-%{release}
 Provides:       prometheus(ha_cluster_exporter) = %{version}-%{release}
 ExclusiveArch:  aarch64 x86_64 ppc64le s390x
 %{go_nostrip}
+#Compat macro for new _fillupdir macro introduced in Nov 2017
+%if ! %{defined _fillupdir}
+  %define _fillupdir /var/adm/fillup-templates
+%endif
 
 %description
 Prometheus exporter for Pacemaker HA clusters metrics
@@ -57,6 +62,9 @@ install -D -m 0755 %{shortname} "%{buildroot}%{_bindir}/%{shortname}"
 # Install the systemd unit
 install -D -m 0644 %{shortname}.service %{buildroot}%{_unitdir}/%{name}.service
 
+# Install the environment file
+install -D -m 0644 %{shortname}.sysconfig %{buildroot}%{_fillupdir}/sysconfig.%{name}
+
 # Install compat wrapper for legacy init systems
 install -Dd -m 0755 %{buildroot}%{_sbindir}
 ln -s /usr/sbin/service %{buildroot}%{_sbindir}/rc%{name}
@@ -66,6 +74,7 @@ ln -s /usr/sbin/service %{buildroot}%{_sbindir}/rc%{name}
 
 %post
 %service_add_post %{name}.service
+%fillup_only -n %{name}
 
 %preun
 %service_del_preun %{name}.service
@@ -83,6 +92,7 @@ ln -s /usr/sbin/service %{buildroot}%{_sbindir}/rc%{name}
 %endif
 %{_bindir}/%{shortname}
 %{_unitdir}/%{name}.service
+%{_fillupdir}/sysconfig.%{name}
 %{_sbindir}/rc%{name}
 
 %changelog


Test patch:
diff --git a/collector/corosync/corosync_test.go b/collector/corosync/corosync_test.go
index 1121cb2..9814b61 100644
--- a/collector/corosync/corosync_test.go
+++ b/collector/corosync/corosync_test.go
@@ -3,45 +3,46 @@ package corosync
 import (
 	"testing"
 
+	"github.com/go-kit/log"
 	"github.com/stretchr/testify/assert"
 
 	assertcustom "github.com/ClusterLabs/ha_cluster_exporter/internal/assert"
 )
 
 func TestNewCorosyncCollector(t *testing.T) {
-	_, err := NewCollector("../../test/fake_corosync-cfgtool.sh", "../../test/fake_corosync-quorumtool.sh")
+	_, err := NewCollector("../../test/fake_corosync-cfgtool.sh", "../../test/fake_corosync-quorumtool.sh", false, log.NewNopLogger())
 	assert.Nil(t, err)
 }
 
 func TestNewCorosyncCollectorChecksCfgtoolExistence(t *testing.T) {
-	_, err := NewCollector("../../test/nonexistent", "../../test/fake_corosync-quorumtool.sh")
+	_, err := NewCollector("../../test/nonexistent", "../../test/fake_corosync-quorumtool.sh", false, log.NewNopLogger())
 
 	assert.Error(t, err)
 	assert.Contains(t, err.Error(), "'../../test/nonexistent' does not exist")
 }
 
 func TestNewCorosyncCollectorChecksQuorumtoolExistence(t *testing.T) {
-	_, err := NewCollector("../../test/fake_corosync-cfgtool.sh", "../../test/nonexistent")
+	_, err := NewCollector("../../test/fake_corosync-cfgtool.sh", "../../test/nonexistent", false, log.NewNopLogger())
 
 	assert.Error(t, err)
 	assert.Contains(t, err.Error(), "'../../test/nonexistent' does not exist")
 }
 
 func TestNewCorosyncCollectorChecksCfgtoolExecutableBits(t *testing.T) {
-	_, err := NewCollector("../../test/dummy", "../../test/fake_corosync-quorumtool.sh")
+	_, err := NewCollector("../../test/dummy", "../../test/fake_corosync-quorumtool.sh", false, log.NewNopLogger())
 
 	assert.Error(t, err)
 	assert.Contains(t, err.Error(), "'../../test/dummy' is not executable")
 }
 
 func TestNewCorosyncCollectorChecksQuorumtoolExecutableBits(t *testing.T) {
-	_, err := NewCollector("../../test/fake_corosync-cfgtool.sh", "../../test/dummy")
+	_, err := NewCollector("../../test/fake_corosync-cfgtool.sh", "../../test/dummy", false, log.NewNopLogger())
 
 	assert.Error(t, err)
 	assert.Contains(t, err.Error(), "'../../test/dummy' is not executable")
 }
 
 func TestCorosyncCollector(t *testing.T) {
-	collector, _ := NewCollector("../../test/fake_corosync-cfgtool.sh", "../../test/fake_corosync-quorumtool.sh")
+	collector, _ := NewCollector("../../test/fake_corosync-cfgtool.sh", "../../test/fake_corosync-quorumtool.sh", false, log.NewNopLogger())
 	assertcustom.Metrics(t, collector, "corosync.metrics")
 }
diff --git a/collector/default_collector_test.go b/collector/default_collector_test.go
index 3c8bc0f..59a9cfd 100644
--- a/collector/default_collector_test.go
+++ b/collector/default_collector_test.go
@@ -3,15 +3,15 @@ package collector
 import (
 	"testing"
 
+	"github.com/go-kit/log"
 	dto "github.com/prometheus/client_model/go"
-	config "github.com/spf13/viper"
 	"github.com/stretchr/testify/assert"
 
 	"github.com/ClusterLabs/ha_cluster_exporter/internal/clock"
 )
 
 func TestMetricFactory(t *testing.T) {
-	SUT := NewDefaultCollector("test")
+	SUT := NewDefaultCollector("test", false, log.NewNopLogger())
 	SUT.SetDescriptor("test_metric", "", nil)
 
 	metric := SUT.MakeGaugeMetric("test_metric", 1)
@@ -20,10 +20,8 @@ func TestMetricFactory(t *testing.T) {
 }
 
 func TestMetricFactoryWithTimestamp(t *testing.T) {
-	config.Set("enable-timestamps", true)
-	defer config.Set("enable-timestamps", false)
 
-	SUT := NewDefaultCollector("test")
+	SUT := NewDefaultCollector("test", true, log.NewNopLogger())
 	SUT.Clock = &clock.StoppedClock{}
 	SUT.SetDescriptor("test_metric", "", nil)
 
diff --git a/collector/drbd/drbd_test.go b/collector/drbd/drbd_test.go
index 84b7f6b..06ea44c 100644
--- a/collector/drbd/drbd_test.go
+++ b/collector/drbd/drbd_test.go
@@ -4,6 +4,7 @@ import (
 	"strings"
 	"testing"
 
+	"github.com/go-kit/log"
 	"github.com/prometheus/client_golang/prometheus/testutil"
 	"github.com/stretchr/testify/assert"
 
@@ -143,32 +144,32 @@ func TestDrbdParsing(t *testing.T) {
 }
 
 func TestNewDrbdCollector(t *testing.T) {
-	_, err := NewCollector("../../test/fake_drbdsetup.sh", "splitbrainpath")
+	_, err := NewCollector("../../test/fake_drbdsetup.sh", "splitbrainpath", false, log.NewNopLogger())
 
 	assert.Nil(t, err)
 }
 
 func TestNewDrbdCollectorChecksDrbdsetupExistence(t *testing.T) {
-	_, err := NewCollector("../../test/nonexistent", "splitbrainfake")
+	_, err := NewCollector("../../test/nonexistent", "splitbrainfake", false, log.NewNopLogger())
 
 	assert.Error(t, err)
 	assert.Contains(t, err.Error(), "'../../test/nonexistent' does not exist")
 }
 
 func TestNewDrbdCollectorChecksDrbdsetupExecutableBits(t *testing.T) {
-	_, err := NewCollector("../../test/dummy", "splibrainfake")
+	_, err := NewCollector("../../test/dummy", "splibrainfake", false, log.NewNopLogger())
 
 	assert.Error(t, err)
 	assert.Contains(t, err.Error(), "'../../test/dummy' is not executable")
 }
 
 func TestDRBDCollector(t *testing.T) {
-	collector, _ := NewCollector("../../test/fake_drbdsetup.sh", "fake")
+	collector, _ := NewCollector("../../test/fake_drbdsetup.sh", "fake", false, log.NewNopLogger())
 	assertcustom.Metrics(t, collector, "drbd.metrics")
 }
 
 func TestDRBDSplitbrainCollector(t *testing.T) {
-	collector, _ := NewCollector("../../test/fake_drbdsetup.sh", "../../test/drbd-splitbrain")
+	collector, _ := NewCollector("../../test/fake_drbdsetup.sh", "../../test/drbd-splitbrain", false, log.NewNopLogger())
 
 	expect := `
 	# HELP ha_cluster_drbd_split_brain Whether a split brain has been detected; 1 line per resource, per volume.
diff --git a/collector/instrumented_collector_test.go b/collector/instrumented_collector_test.go
index 2a576bd..f07c2f4 100644
--- a/collector/instrumented_collector_test.go
+++ b/collector/instrumented_collector_test.go
@@ -2,24 +2,18 @@ package collector
 
 import (
 	"errors"
-	"io/ioutil"
 	"strings"
 	"testing"
 
+	"github.com/go-kit/log"
 	"github.com/golang/mock/gomock"
 	"github.com/prometheus/client_golang/prometheus/testutil"
-	"github.com/sirupsen/logrus"
-	testlog "github.com/sirupsen/logrus/hooks/test"
 	"github.com/stretchr/testify/assert"
 
 	"github.com/ClusterLabs/ha_cluster_exporter/internal/clock"
 	"github.com/ClusterLabs/ha_cluster_exporter/test/mock_collector"
 )
 
-func init() {
-	logrus.SetOutput(ioutil.Discard)
-}
-
 func TestInstrumentedCollector(t *testing.T) {
 	ctrl := gomock.NewController(t)
 	defer ctrl.Finish()
@@ -29,7 +23,7 @@ func TestInstrumentedCollector(t *testing.T) {
 	mockCollector.EXPECT().Describe(gomock.Any())
 	mockCollector.EXPECT().CollectWithError(gomock.Any())
 
-	SUT := NewInstrumentedCollector(mockCollector)
+	SUT := NewInstrumentedCollector(mockCollector, log.NewNopLogger())
 	SUT.Clock = &clock.StoppedClock{}
 
 	metrics := `# HELP ha_cluster_scrape_duration_seconds Duration of a collector scrape.
@@ -48,15 +42,13 @@ func TestInstrumentedCollectorScrapeFailure(t *testing.T) {
 	ctrl := gomock.NewController(t)
 	defer ctrl.Finish()
 
-	logHook := testlog.NewGlobal()
-	defer logHook.Reset()
-
 	mockCollector := mock_collector.NewMockInstrumentableCollector(ctrl)
 	mockCollector.EXPECT().GetSubsystem().Return("mock_collector").AnyTimes()
 	mockCollector.EXPECT().Describe(gomock.Any())
-	mockCollector.EXPECT().CollectWithError(gomock.Any()).Return(errors.New("test error"))
+	collectWithError := mockCollector.EXPECT().CollectWithError(gomock.Any())
+	collectWithError.Return(errors.New("test error"))
 
-	SUT := NewInstrumentedCollector(mockCollector)
+	SUT := NewInstrumentedCollector(mockCollector, log.NewNopLogger())
 
 	metrics := `# HELP ha_cluster_scrape_success Whether a collector succeeded.
 # TYPE ha_cluster_scrape_success gauge
@@ -66,6 +58,5 @@ ha_cluster_scrape_success{collector="mock_collector"} 0
 	err := testutil.CollectAndCompare(SUT, strings.NewReader(metrics), "ha_cluster_scrape_success")
 	assert.NoError(t, err)
 
-	assert.Len(t, logHook.Entries, 1)
-	assert.Contains(t, logHook.LastEntry().Message, "test error")
+	assert.NotNil(t, collectWithError)
 }
diff --git a/collector/pacemaker/pacemaker_test.go b/collector/pacemaker/pacemaker_test.go
index 2c53285..f67046e 100644
--- a/collector/pacemaker/pacemaker_test.go
+++ b/collector/pacemaker/pacemaker_test.go
@@ -3,33 +3,34 @@ package pacemaker
 import (
 	"testing"
 
+	"github.com/go-kit/log"
 	"github.com/stretchr/testify/assert"
 
 	assertcustom "github.com/ClusterLabs/ha_cluster_exporter/internal/assert"
 )
 
 func TestNewPacemakerCollector(t *testing.T) {
-	_, err := NewCollector("../../test/fake_crm_mon.sh", "../../test/fake_cibadmin.sh")
+	_, err := NewCollector("../../test/fake_crm_mon.sh", "../../test/fake_cibadmin.sh", false, log.NewNopLogger())
 
 	assert.Nil(t, err)
 }
 
 func TestNewPacemakerCollectorChecksCrmMonExistence(t *testing.T) {
-	_, err := NewCollector("../../test/nonexistent", "")
+	_, err := NewCollector("../../test/nonexistent", "", false, log.NewNopLogger())
 
 	assert.Error(t, err)
 	assert.Contains(t, err.Error(), "'../../test/nonexistent' does not exist")
 }
 
 func TestNewPacemakerCollectorChecksCrmMonExecutableBits(t *testing.T) {
-	_, err := NewCollector("../../test/dummy", "")
+	_, err := NewCollector("../../test/dummy", "", false, log.NewNopLogger())
 
 	assert.Error(t, err)
 	assert.Contains(t, err.Error(), "'../../test/dummy' is not executable")
 }
 
 func TestPacemakerCollector(t *testing.T) {
-	collector, err := NewCollector("../../test/fake_crm_mon.sh", "../../test/fake_cibadmin.sh")
+	collector, err := NewCollector("../../test/fake_crm_mon.sh", "../../test/fake_cibadmin.sh", false, log.NewNopLogger())
 
 	assert.Nil(t, err)
 	assertcustom.Metrics(t, collector, "pacemaker.metrics")
diff --git a/collector/sbd/sbd_test.go b/collector/sbd/sbd_test.go
index 01e897b..b41a1de 100644
--- a/collector/sbd/sbd_test.go
+++ b/collector/sbd/sbd_test.go
@@ -3,6 +3,7 @@ package sbd
 import (
 	"testing"
 
+	"github.com/go-kit/log"
 	"github.com/stretchr/testify/assert"
 
 	assertcustom "github.com/ClusterLabs/ha_cluster_exporter/internal/assert"
@@ -187,39 +188,39 @@ SBD_DEVICE=/dev/vdc;/dev/vdd`
 }
 
 func TestNewSbdCollector(t *testing.T) {
-	_, err := NewCollector("../../test/fake_sbd.sh", "../../test/fake_sbdconfig")
+	_, err := NewCollector("../../test/fake_sbd.sh", "../../test/fake_sbdconfig", false, log.NewNopLogger())
 
 	assert.Nil(t, err)
 }
 
 func TestNewSbdCollectorChecksSbdConfigExistence(t *testing.T) {
-	_, err := NewCollector("../../test/fake_sbd.sh", "../../test/nonexistent")
+	_, err := NewCollector("../../test/fake_sbd.sh", "../../test/nonexistent", false, log.NewNopLogger())
 
 	assert.Error(t, err)
 	assert.Contains(t, err.Error(), "'../../test/nonexistent' does not exist")
 }
 
 func TestNewSbdCollectorChecksSbdExistence(t *testing.T) {
-	_, err := NewCollector("../../test/nonexistent", "../../test/fake_sbdconfig")
+	_, err := NewCollector("../../test/nonexistent", "../../test/fake_sbdconfig", false, log.NewNopLogger())
 
 	assert.Error(t, err)
 	assert.Contains(t, err.Error(), "'../../test/nonexistent' does not exist")
 }
 
 func TestNewSbdCollectorChecksSbdExecutableBits(t *testing.T) {
-	_, err := NewCollector("../../test/dummy", "../../test/fake_sbdconfig")
+	_, err := NewCollector("../../test/dummy", "../../test/fake_sbdconfig", false, log.NewNopLogger())
 
 	assert.Error(t, err)
 	assert.Contains(t, err.Error(), "'../../test/dummy' is not executable")
 }
 
 func TestSBDCollector(t *testing.T) {
-	collector, _ := NewCollector("../../test/fake_sbd_dump.sh", "../../test/fake_sbdconfig")
+	collector, _ := NewCollector("../../test/fake_sbd_dump.sh", "../../test/fake_sbdconfig", false, log.NewNopLogger())
 	assertcustom.Metrics(t, collector, "sbd.metrics")
 }
 
 func TestWatchdog(t *testing.T) {
-	collector, err := NewCollector("../../test/fake_sbd_dump.sh", "../../test/fake_sbdconfig")
+	collector, err := NewCollector("../../test/fake_sbd_dump.sh", "../../test/fake_sbdconfig", false, log.NewNopLogger())
 
 	assert.Nil(t, err)
 	assertcustom.Metrics(t, collector, "sbd.metrics")
diff --git a/ha_cluster_exporter_test.go b/ha_cluster_exporter_test.go
index 966e128..5a114c1 100644
--- a/ha_cluster_exporter_test.go
+++ b/ha_cluster_exporter_test.go
@@ -1,76 +1,270 @@
 package main
 
 import (
+	"context"
+	"fmt"
+	"io/ioutil"
+	"net"
+	"net/http"
+	"net/url"
+	"os"
+	"os/exec"
+	"reflect"
+	"runtime"
+	"strings"
+	"syscall"
 	"testing"
+	"time"
 
+	"github.com/go-kit/log"
 	"github.com/prometheus/client_golang/prometheus"
-	"github.com/spf13/viper"
+	// We could also mock this but test files alrady exist in test dir
+	//"github.com/spf13/afero"
 	"github.com/stretchr/testify/assert"
 )
 
 func TestRegisterCollectors(t *testing.T) {
-	tests := []struct {
-		name           string
-		config         map[string]interface{}
-		wantCollectors int
-		wantErrors     int
-	}{
-		{
-			name:           "success",
-			config:         nil,
-			wantCollectors: 4,
-			wantErrors:     0,
-		},
-		{
-			name: "1 failure",
-			config: map[string]interface{}{
-				"crm-mon-path": "foo",
-			},
-			wantCollectors: 3,
-			wantErrors:     1,
-		},
-		{
-			name: "2 failures",
-			config: map[string]interface{}{
-				"crm-mon-path":              "foo",
-				"corosync-cfgtoolpath-path": "foo",
-			},
-			wantCollectors: 2,
-			wantErrors:     2,
-		},
-		{
-			name: "3 failures",
-			config: map[string]interface{}{
-				"crm-mon-path":              "foo",
-				"corosync-cfgtoolpath-path": "foo",
-				"sbd-path":                  "foo",
-			},
-			wantCollectors: 1,
-			wantErrors:     3,
-		},
-		{
-			name: "4 failures",
-			config: map[string]interface{}{
-				"crm-mon-path":              "foo",
-				"corosync-cfgtoolpath-path": "foo",
-				"sbd-path":                  "foo",
-				"drbdsetup-path":            "foo",
-			},
-			wantCollectors: 0,
-			wantErrors:     4,
-		},
+	// We could also mock this but test files alrady exist in test dir
+	// filesystem as os.Stat() is run in default_collector.go
+	// fs := afero.NewMemMapFs() # does not work
+	//fs := afero.NewOsFs()
+	//fs.MkdirAll("test/bin", 0755)
+	//afero.WriteFile(fs, "test/bin/crm-mon-path", []byte(""), 0755)
+	//afero.WriteFile(fs, "test/bin/cibadmin-path", []byte(""), 0755)
+	//afero.WriteFile(fs, "test/bin/corosync-cfgtoolpath-path", []byte(""), 0755)
+	//afero.WriteFile(fs, "test/bin/corosync-quorumtool-path", []byte(""), 0755)
+	//afero.WriteFile(fs, "test/bin/sbd-path", []byte(""), 0755)
+	//afero.WriteFile(fs, "test/bin/sbd-config-path", []byte(""), 0755)
+	//afero.WriteFile(fs, "test/bin/drbdsetup-path", []byte(""), 0755)
+	//afero.WriteFile(fs, "test/bin/drbdsplitbrain-path", []byte(""), 0755)
+	*haClusterCrmMonPath = "test/fake_crm_mon.sh"
+	*haClusterCibadminPath = "test/fake_cibadmin.sh"
+	*haClusterCorosyncCfgtoolpathPath = "test/fake_corosync-cfgtool.sh"
+	*haClusterCorosyncQuorumtoolPath = "test/fake_corosync-quorumtool.sh"
+	*haClusterSbdPath = "test/fake_sbd.sh"
+	*haClusterSbdConfigPath = "test/fake_sbdconfig"
+	*haClusterDrbdsetupPath = "test/fake_drbdsetup.sh"
+	*haClusterDrbdsplitbrainPath = "test/fake_drbdsplitbrain"
+
+	t.Run("success", func(t *testing.T) {
+		wantCollectors := 4
+		wantErrors := 0
+		prometheus.DefaultRegisterer = prometheus.NewRegistry()
+		prometheus.DefaultGatherer = prometheus.NewRegistry()
+		collectors, errors := registerCollectors(log.NewNopLogger())
+		assert.Len(t, collectors, wantCollectors)
+		assert.Len(t, errors, wantErrors)
+	})
+
+	*haClusterCrmMonPath = "does_not_exist"
+	t.Run("1 failure", func(t *testing.T) {
+		wantCollectors := 3
+		wantErrors := 1
+		prometheus.DefaultRegisterer = prometheus.NewRegistry()
+		prometheus.DefaultGatherer = prometheus.NewRegistry()
+		collectors, errors := registerCollectors(log.NewNopLogger())
+		assert.Len(t, collectors, wantCollectors)
+		assert.Len(t, errors, wantErrors)
+	})
+
+	*haClusterCorosyncCfgtoolpathPath = "does_not_exist"
+	t.Run("2 failures", func(t *testing.T) {
+		wantCollectors := 2
+		wantErrors := 2
+		prometheus.DefaultRegisterer = prometheus.NewRegistry()
+		prometheus.DefaultGatherer = prometheus.NewRegistry()
+		collectors, errors := registerCollectors(log.NewNopLogger())
+		assert.Len(t, collectors, wantCollectors)
+		assert.Len(t, errors, wantErrors)
+	})
+
+	*haClusterSbdPath = "does_not_exist"
+	t.Run("3 failures", func(t *testing.T) {
+		wantCollectors := 1
+		wantErrors := 3
+		prometheus.DefaultRegisterer = prometheus.NewRegistry()
+		prometheus.DefaultGatherer = prometheus.NewRegistry()
+		collectors, errors := registerCollectors(log.NewNopLogger())
+		assert.Len(t, collectors, wantCollectors)
+		assert.Len(t, errors, wantErrors)
+	})
+
+	*haClusterDrbdsetupPath = "does_not_exist"
+	t.Run("4 failures", func(t *testing.T) {
+		wantCollectors := 0
+		wantErrors := 4
+		prometheus.DefaultRegisterer = prometheus.NewRegistry()
+		prometheus.DefaultGatherer = prometheus.NewRegistry()
+		collectors, errors := registerCollectors(log.NewNopLogger())
+		assert.Len(t, collectors, wantCollectors)
+		assert.Len(t, errors, wantErrors)
+	})
+	//fs.RemoveAll("test/bin")
+}
+
+//// Kudos for the build/run tests to https://github.com/prometheus/mysqld_exporter
+// TestBin builds, runs and tests binary.
+
+// bin stores information about path of executable and attached port
+type bin struct {
+	path string
+	port int
+}
+
+func TestBin(t *testing.T) {
+	var err error
+	binName := "ha"
+
+	binDir, err := ioutil.TempDir("/tmp", binName+"-test-bindir-")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() {
+		err := os.RemoveAll(binDir)
+		if err != nil {
+			t.Fatal(err)
+		}
+	}()
+
+	importpath := "github.com/prometheus/ha_cluster_exporter/vendor/github.com/prometheus/common"
+	path := binDir + "/" + binName
+	xVariables := map[string]string{
+		importpath + "/version.Version":  "gotest-version",
+		importpath + "/version.Branch":   "gotest-branch",
+		importpath + "/version.Revision": "gotest-revision",
+	}
+	var ldflags []string
+	for x, value := range xVariables {
+		ldflags = append(ldflags, fmt.Sprintf("-X %s=%s", x, value))
+	}
+	cmd := exec.Command(
+		"go",
+		"build",
+		"-o",
+		path,
+		"-ldflags",
+		strings.Join(ldflags, " "),
+	)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	err = cmd.Run()
+	if err != nil {
+		t.Fatalf("Failed to build: %s", err)
+	}
+
+	tests := []func(*testing.T, bin){
+		testLandingPage,
+	}
+
+	portStart := 56000
+	t.Run(binName, func(t *testing.T) {
+		for _, f := range tests {
+			f := f // capture range variable
+			fName := runtime.FuncForPC(reflect.ValueOf(f).Pointer()).Name()
+			portStart++
+			data := bin{
+				path: path,
+				port: portStart,
+			}
+			t.Run(fName, func(t *testing.T) {
+				t.Parallel()
+				f(t, data)
+			})
+		}
+	})
+}
+
+func testLandingPage(t *testing.T, data bin) {
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	// Run exporter.
+	servePath := "/metrics"
+	cmd := exec.CommandContext(
+		ctx,
+		data.path,
+		"--web.listen-address", fmt.Sprintf(":%d", data.port),
+		"--web.telemetry-path", fmt.Sprintf("%s", servePath),
+		"--crm-mon-path=test/fake_crm_mon.sh", // needed to register at least one collector
+		"--cibadmin-path=test/fake_cibadmin.sh",
+	)
+	if err := cmd.Start(); err != nil {
+		t.Fatal(err)
+	}
+	defer cmd.Wait()
+	defer cmd.Process.Kill()
+
+	// Get the main page.
+	urlToGet := fmt.Sprintf("http://127.0.0.1:%d", data.port)
+	body, err := waitForBody(urlToGet)
+	if err != nil {
+		t.Fatal(err)
 	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			prometheus.DefaultRegisterer = prometheus.NewRegistry()
-			prometheus.DefaultGatherer = prometheus.NewRegistry()
-			config := viper.New()
-			config.SetConfigFile("test/test_config.yaml")
-			_ = config.ReadInConfig()
-			_ = config.MergeConfigMap(tt.config)
-			collectors, errors := registerCollectors(config)
-			assert.Len(t, collectors, tt.wantCollectors)
-			assert.Len(t, errors, tt.wantErrors)
-		})
+	got := string(body)
+	expected := `<html>
+<head>
+	<title>ClusterLabs Linux HA Cluster Exporter</title>
+</head>
+<body>
+	<h1>ClusterLabs Linux HA Cluster Exporter</h1>
+	<h2>Prometheus exporter for Pacemaker based Linux HA clusters</h2>
+	<ul>
+		<li><a href="` + servePath + `">Metrics</a></li>
+		<li><a href="https://github.com/ClusterLabs/ha_cluster_exporter" target="_blank">GitHub</a></li>
+	</ul>
+</body>
+</html>
+`
+
+	if got != expected {
+		t.Fatalf("got '%s' but expected '%s'", got, expected)
 	}
 }
+
+// waitForBody is a helper function which makes http calls until http server is up
+// and then returns body of the successful call.
+func waitForBody(urlToGet string) (body []byte, err error) {
+	tries := 60
+
+	// Get data, but we need to wait a bit for http server.
+	for i := 0; i <= tries; i++ {
+		// Try to get web page.
+		body, err = getBody(urlToGet)
+		if err == nil {
+			return body, err
+		}
+
+		// If there is a syscall.ECONNREFUSED error (web server not available) then retry.
+		if urlError, ok := err.(*url.Error); ok {
+			if opError, ok := urlError.Err.(*net.OpError); ok {
+				if osSyscallError, ok := opError.Err.(*os.SyscallError); ok {
+					if osSyscallError.Err == syscall.ECONNREFUSED {
+						time.Sleep(1 * time.Second)
+						continue
+					}
+				}
+			}
+		}
+
+		// There was an error, and it wasn't syscall.ECONNREFUSED.
+		return nil, err
+	}
+
+	return nil, fmt.Errorf("failed to GET %s after %d tries: %s", urlToGet, tries, err)
+}
+
+// getBody is a helper function which retrieves http body from given address.
+func getBody(urlToGet string) ([]byte, error) {
+	resp, err := http.Get(urlToGet)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	return body, nil
+}
diff --git a/test/mock_collector/instrumented_collector.go b/test/mock_collector/instrumented_collector.go
index eba7b56..3dd336b 100644
--- a/test/mock_collector/instrumented_collector.go
+++ b/test/mock_collector/instrumented_collector.go
@@ -5,47 +5,48 @@
 package mock_collector
 
 import (
+	reflect "reflect"
+
 	gomock "github.com/golang/mock/gomock"
 	prometheus "github.com/prometheus/client_golang/prometheus"
-	reflect "reflect"
 )
 
-// MockInstrumentableCollector is a mock of InstrumentableCollector interface
+// MockInstrumentableCollector is a mock of InstrumentableCollector interface.
 type MockInstrumentableCollector struct {
 	ctrl     *gomock.Controller
 	recorder *MockInstrumentableCollectorMockRecorder
 }
 
-// MockInstrumentableCollectorMockRecorder is the mock recorder for MockInstrumentableCollector
+// MockInstrumentableCollectorMockRecorder is the mock recorder for MockInstrumentableCollector.
 type MockInstrumentableCollectorMockRecorder struct {
 	mock *MockInstrumentableCollector
 }
 
-// NewMockInstrumentableCollector creates a new mock instance
+// NewMockInstrumentableCollector creates a new mock instance.
 func NewMockInstrumentableCollector(ctrl *gomock.Controller) *MockInstrumentableCollector {
 	mock := &MockInstrumentableCollector{ctrl: ctrl}
 	mock.recorder = &MockInstrumentableCollectorMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use
+// EXPECT returns an object that allows the caller to indicate expected use.
 func (m *MockInstrumentableCollector) EXPECT() *MockInstrumentableCollectorMockRecorder {
 	return m.recorder
 }
 
-// Collect mocks base method
+// Collect mocks base method.
 func (m *MockInstrumentableCollector) Collect(arg0 chan<- prometheus.Metric) {
 	m.ctrl.T.Helper()
 	m.ctrl.Call(m, "Collect", arg0)
 }
 
-// Collect indicates an expected call of Collect
+// Collect indicates an expected call of Collect.
 func (mr *MockInstrumentableCollectorMockRecorder) Collect(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Collect", reflect.TypeOf((*MockInstrumentableCollector)(nil).Collect), arg0)
 }
 
-// CollectWithError mocks base method
+// CollectWithError mocks base method.
 func (m *MockInstrumentableCollector) CollectWithError(arg0 chan<- prometheus.Metric) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "CollectWithError", arg0)
@@ -53,25 +54,25 @@ func (m *MockInstrumentableCollector) CollectWithError(arg0 chan<- prometheus.Me
 	return ret0
 }
 
-// CollectWithError indicates an expected call of CollectWithError
+// CollectWithError indicates an expected call of CollectWithError.
 func (mr *MockInstrumentableCollectorMockRecorder) CollectWithError(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CollectWithError", reflect.TypeOf((*MockInstrumentableCollector)(nil).CollectWithError), arg0)
 }
 
-// Describe mocks base method
+// Describe mocks base method.
 func (m *MockInstrumentableCollector) Describe(arg0 chan<- *prometheus.Desc) {
 	m.ctrl.T.Helper()
 	m.ctrl.Call(m, "Describe", arg0)
 }
 
-// Describe indicates an expected call of Describe
+// Describe indicates an expected call of Describe.
 func (mr *MockInstrumentableCollectorMockRecorder) Describe(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Describe", reflect.TypeOf((*MockInstrumentableCollector)(nil).Describe), arg0)
 }
 
-// GetSubsystem mocks base method
+// GetSubsystem mocks base method.
 func (m *MockInstrumentableCollector) GetSubsystem() string {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "GetSubsystem")
@@ -79,7 +80,7 @@ func (m *MockInstrumentableCollector) GetSubsystem() string {
 	return ret0
 }
 
-// GetSubsystem indicates an expected call of GetSubsystem
+// GetSubsystem indicates an expected call of GetSubsystem.
 func (mr *MockInstrumentableCollectorMockRecorder) GetSubsystem() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetSubsystem", reflect.TypeOf((*MockInstrumentableCollector)(nil).GetSubsystem))