Repository: kubernetes/kops (go)

Issue:
Metrics-server failing to scrape nodes due to timeout and DNS lookup errors
/kind bug

I'm trying to set up a new cluster on GCE with metrics-server enabled. I'm facing two issues, which are not related to each other.  
- The first issue is that metrics-server is running on nodes and it can not scrape masters. I've fixed this issue by adding `tcp:10250` to `nodes-to-master` firewall rule by hand.  
- The second issue is that metrics-server can not resolve some hosts by node name. Behaviour is inconsistent regarding which host can not be resolved on each rerun (delete, create). And also sometimes one metrics-server pod can resolve all hosts while the second one can not. I've noticed it because when running `k top no` multiple times results will be different regarding which pod servers the request. I **think** I've managed to fix it by setting `--kubelet-preferred-address-types=InternalIP` based on this comment: https://github.com/kubernetes-sigs/metrics-server/issues/131. I've checked `dns-controller` pod and it looks okay to me (no errors). 
 
**1. What `kops` version are you running? The command `kops version`, will display
 this information.**
`Client version: 1.25.3 (git-v1.25.3)`

**2. What Kubernetes version are you running? `kubectl version` will print the
 version if a cluster is running or provide the Kubernetes version specified as
 a `kops` flag.**
```
Client Version: version.Info{Major:"1", Minor:"25", GitVersion:"v1.25.4", GitCommit:"872a965c6c6526caa949f0c6ac028ef7aff3fb78", GitTreeState:"clean", BuildDate:"2022-11-09T13:36:36Z", GoVersion:"go1.19.3", Compiler:"gc", Platform:"linux/amd64"}
Kustomize Version: v4.5.7
Server Version: version.Info{Major:"1", Minor:"25", GitVersion:"v1.25.4", GitCommit:"872a965c6c6526caa949f0c6ac028ef7aff3fb78", GitTreeState:"clean", BuildDate:"2022-11-09T13:29:58Z", GoVersion:"go1.19.3", Compiler:"gc", Platform:"linux/amd64"}
```

**3. What cloud provider are you using?**

GCE

**4. What commands did you run?  What is the simplest way to reproduce this issue?**
```
kops create -f kops.yaml
kops update cluster --name cluster.k8s.local --yes
kops export kubecfg --admin
kops validate cluster --wait 10m
```
**5. What happened after the commands executed?**
Cluster validation passes and all pods are running, but `k top no` returns values for a subset of nodes only. 

**6. What did you expect to happen?**
`k top no` returns values for all nodes consistently.  

**7. Please provide your cluster manifest. Execute
  `kops get --name my.example.com -o yaml` to display your cluster manifest.
  You may want to remove your cluster name and other sensitive information.**

```yaml
apiVersion: kops.k8s.io/v1alpha2
kind: Cluster
metadata:
  creationTimestamp: null
  name: cluster.k8s.local
spec:
  api:
    loadBalancer:
      type: Public
  authorization:
    rbac: {}
  channel: stable
  cloudConfig: {}
  cloudProvider: gce
  configBase: gs://fbozic-kops-state-store/cluster.k8s.local
  etcdClusters:
    - cpuRequest: 200m
      etcdMembers:
        - instanceGroup: master-europe-west3-a
          name: a
        - instanceGroup: master-europe-west3-b
          name: b
        - instanceGroup: master-europe-west3-c
          name: c
      memoryRequest: 100Mi
      name: main
    - cpuRequest: 100m
      etcdMembers:
        - instanceGroup: master-europe-west3-a
          name: a
        - instanceGroup: master-europe-west3-b
          name: b
        - instanceGroup: master-europe-west3-c
          name: c
      memoryRequest: 100Mi
      name: events
    - cpuRequest: 100m
      etcdMembers:
        - instanceGroup: master-europe-west3-a
          name: a
        - instanceGroup: master-europe-west3-b
          name: b
        - instanceGroup: master-europe-west3-c
          name: c
      manager:
        env:
          - name: ETCD_AUTO_COMPACTION_MODE
            value: revision
          - name: ETCD_AUTO_COMPACTION_RETENTION
            value: "2500"
      memoryRequest: 100Mi
      name: cilium
  iam:
    allowContainerRegistry: true
    legacy: false
  kubeProxy:
    enabled: false
  kubelet:
    anonymousAuth: false
    authenticationTokenWebhook: true
    authorizationMode: Webhook
  kubernetesApiAccess:
    - 0.0.0.0/0
    - ::/0
  kubernetesVersion: 1.25.4
  masterPublicName: api.cluster.k8s.local
  metricsServer:
    enabled: true
    insecure: true
  networkID: fbozic
  networking:
    cilium:
      enableNodePort: true
      etcdManaged: true
  nonMasqueradeCIDR: 100.64.0.0/10
  project: fbozic-ops
  subnets:
    - cidr: 10.0.32.0/20
      name: europe-west3
      region: europe-west3
      type: Private
  topology:
    dns:
      type: Public
    masters: private
    nodes: private

---
apiVersion: kops.k8s.io/v1alpha2
kind: InstanceGroup
metadata:
  creationTimestamp: null
  labels:
    kops.k8s.io/cluster: cluster.k8s.local
  name: master-europe-west3-a
spec:
  image: ubuntu-os-cloud/ubuntu-2004-focal-v20221018
  machineType: n1-standard-4
  maxSize: 1
  minSize: 1
  role: Master
  subnets:
    - europe-west3
  zones:
    - europe-west3-a

---
apiVersion: kops.k8s.io/v1alpha2
kind: InstanceGroup
metadata:
  creationTimestamp: null
  labels:
    kops.k8s.io/cluster: cluster.k8s.local
  name: master-europe-west3-b
spec:
  image: ubuntu-os-cloud/ubuntu-2004-focal-v20221018
  machineType: n1-standard-4
  maxSize: 1
  minSize: 1
  role: Master
  subnets:
    - europe-west3
  zones:
    - europe-west3-b

---
apiVersion: kops.k8s.io/v1alpha2
kind: InstanceGroup
metadata:
  creationTimestamp: null
  labels:
    kops.k8s.io/cluster: cluster.k8s.local
  name: master-europe-west3-c
spec:
  image: ubuntu-os-cloud/ubuntu-2004-focal-v20221018
  machineType: n1-standard-4
  maxSize: 1
  minSize: 1
  role: Master
  subnets:
    - europe-west3
  zones:
    - europe-west3-c

---
apiVersion: kops.k8s.io/v1alpha2
kind: InstanceGroup
metadata:
  creationTimestamp: null
  labels:
    kops.k8s.io/cluster: cluster.k8s.local
  name: nodes-europe-west3
spec:
  image: ubuntu-os-cloud/ubuntu-2004-focal-v20221018
  machineType: n1-standard-4
  maxSize: 6
  minSize: 3
  role: Node
  subnets:
    - europe-west3
  zones:
    - europe-west3-a
    - europe-west3-b
    - europe-west3-c
```

**8. Please run the commands with most verbose logging by adding the `-v 10` flag.
  Paste the logs into this report, or in a gist and provide the gist link here.**

Initial `k top no` (no masters and one node is missing). 
```
❯ k top no
NAME                         CPU(cores)   CPU%        MEMORY(bytes)   MEMORY%     
nodes-europe-west3-634r      54m          1%          1338Mi          8%          
nodes-europe-west3-jmjn      35m          0%          1290Mi          8%          
master-europe-west3-a-dlc1   <unknown>    <unknown>   <unknown>       <unknown>   
master-europe-west3-b-xh98   <unknown>    <unknown>   <unknown>       <unknown>   
master-europe-west3-c-5b0n   <unknown>    <unknown>   <unknown>       <unknown>   
nodes-europe-west3-5vhx      <unknown>    <unknown>   <unknown>       <unknown>   
```

After firewall fix `k top no` (one pod can scrape all hosts, one pod can not scrape two nodes)
```
❯ date +%c
Fri 02 Dec 2022 11:25:31 AM CET
❯ k top no
NAME                         CPU(cores)   CPU%        MEMORY(bytes)   MEMORY%     
master-europe-west3-b-xh98   206m         5%          2293Mi          15%         
master-europe-west3-c-5b0n   246m         6%          2194Mi          14%         
nodes-europe-west3-634r      49m          1%          1326Mi          8%          
nodes-europe-west3-jmjn      45m          1%          1331Mi          8%          
nodes-europe-west3-5vhx      <unknown>    <unknown>   <unknown>       <unknown>   
master-europe-west3-a-dlc1   <unknown>    <unknown>   <unknown>       <unknown>   
❯ date +%c
Fri 02 Dec 2022 11:25:35 AM CET
❯ k top no
NAME                         CPU(cores)   CPU%   MEMORY(bytes)   MEMORY%   
master-europe-west3-a-dlc1   242m         6%     2245Mi          15%       
master-europe-west3-b-xh98   219m         5%     2293Mi          15%       
master-europe-west3-c-5b0n   226m         5%     2194Mi          14%       
nodes-europe-west3-5vhx      51m          1%     1293Mi          8%        
nodes-europe-west3-634r      57m          1%     1328Mi          8%        
nodes-europe-west3-jmjn      48m          1%     1329Mi          8%        
❯ date +%c
Fri 02 Dec 2022 11:25:39 AM CET
```
After `--kubelet-preferred-address-types` fix `k top no` works as expected and there are no errors in logs. 

Logs from the metrics-server pod before `--kubelet-preferred-address-types` fix. Two kinds of `Failed to scrape node` errors: `context deadline exceeded` and `no such host`. I've pasted only the last 50 lines of log from each pod.
Pod a:
```
E1202 09:55:09.936739       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-a-dlc1"
E1202 09:55:09.936809       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-b-xh98:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-b-xh98"
E1202 09:55:24.937930       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-a-dlc1"
E1202 09:55:24.937930       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-b-xh98:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-b-xh98"
E1202 09:55:24.937932       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-c-5b0n:10250/metrics/resource\": dial tcp 10.0.32.5:10250: i/o timeout" node="master-europe-west3-c-5b0n"
E1202 09:55:26.495356       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-b-xh98:10250/metrics/resource\": dial tcp: lookup master-europe-west3-b-xh98 on 100.64.0.10:53: no such host" node="master-europe-west3-b-xh98"
E1202 09:55:39.937046       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-a-dlc1"
E1202 09:55:39.938211       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-c-5b0n:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-c-5b0n"
E1202 09:55:41.518207       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-c-5b0n:10250/metrics/resource\": dial tcp: lookup master-europe-west3-c-5b0n on 100.64.0.10:53: no such host" node="master-europe-west3-c-5b0n"
E1202 09:55:54.937643       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-b-xh98:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-b-xh98"
E1202 09:55:54.937657       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-a-dlc1"
E1202 09:55:56.472195       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-b-xh98:10250/metrics/resource\": dial tcp: lookup master-europe-west3-b-xh98 on 100.64.0.10:53: no such host" node="master-europe-west3-b-xh98"
E1202 09:56:09.937864       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp 10.0.32.7:10250: i/o timeout" node="master-europe-west3-a-dlc1"
E1202 09:56:09.937906       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-c-5b0n:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-c-5b0n"
E1202 09:56:24.937906       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-c-5b0n:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-c-5b0n"
E1202 09:56:24.937972       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp 10.0.32.7:10250: i/o timeout" node="master-europe-west3-a-dlc1"
E1202 09:56:24.937972       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-b-xh98:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-b-xh98"
E1202 09:56:26.456015       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-b-xh98:10250/metrics/resource\": dial tcp: lookup master-europe-west3-b-xh98 on 100.64.0.10:53: no such host" node="master-europe-west3-b-xh98"
E1202 09:56:39.937383       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-a-dlc1"
E1202 09:56:39.937391       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-c-5b0n:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-c-5b0n"
E1202 09:56:41.504596       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-c-5b0n:10250/metrics/resource\": dial tcp: lookup master-europe-west3-c-5b0n on 100.64.0.10:53: no such host" node="master-europe-west3-c-5b0n"
E1202 09:56:54.937714       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-b-xh98:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-b-xh98"
E1202 09:56:54.937714       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp 10.0.32.7:10250: i/o timeout" node="master-europe-west3-a-dlc1"
E1202 09:56:56.487095       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-b-xh98:10250/metrics/resource\": dial tcp: lookup master-europe-west3-b-xh98 on 100.64.0.10:53: no such host" node="master-europe-west3-b-xh98"
E1202 09:56:56.501547       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-c-5b0n:10250/metrics/resource\": dial tcp: lookup master-europe-west3-c-5b0n on 100.64.0.10:53: no such host" node="master-europe-west3-c-5b0n"
E1202 09:57:09.938403       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-a-dlc1"
E1202 09:57:11.456769       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-c-5b0n:10250/metrics/resource\": dial tcp: lookup master-europe-west3-c-5b0n on 100.64.0.10:53: no such host" node="master-europe-west3-c-5b0n"
E1202 09:57:11.465082       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-b-xh98:10250/metrics/resource\": dial tcp: lookup master-europe-west3-b-xh98 on 100.64.0.10:53: no such host" node="master-europe-west3-b-xh98"
E1202 09:57:24.937385       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-a-dlc1"
E1202 09:57:39.937478       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp 10.0.32.7:10250: i/o timeout" node="master-europe-west3-a-dlc1"
E1202 09:57:39.937574       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-c-5b0n:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-c-5b0n"
E1202 09:57:39.937574       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-b-xh98:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-b-xh98"
E1202 09:57:41.501771       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-b-xh98:10250/metrics/resource\": dial tcp: lookup master-europe-west3-b-xh98 on 100.64.0.10:53: no such host" node="master-europe-west3-b-xh98"
E1202 09:57:54.937897       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-c-5b0n:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-c-5b0n"
E1202 09:57:54.937957       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-a-dlc1"
E1202 09:58:09.937237       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-c-5b0n:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-c-5b0n"
E1202 09:58:09.937375       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-b-xh98:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-b-xh98"
E1202 09:58:09.938606       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-a-dlc1"
E1202 09:58:11.475042       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-c-5b0n:10250/metrics/resource\": dial tcp: lookup master-europe-west3-c-5b0n on 100.64.0.10:53: no such host" node="master-europe-west3-c-5b0n"
E1202 09:58:11.495190       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-b-xh98:10250/metrics/resource\": dial tcp: lookup master-europe-west3-b-xh98 on 100.64.0.10:53: no such host" node="master-europe-west3-b-xh98"
E1202 09:58:24.938687       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-a-dlc1"
E1202 09:58:39.937680       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-c-5b0n:10250/metrics/resource\": dial tcp 10.0.32.5:10250: i/o timeout" node="master-europe-west3-c-5b0n"
E1202 09:58:39.937681       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-a-dlc1"
E1202 09:58:39.937800       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-b-xh98:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-b-xh98"
E1202 09:58:41.507949       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-c-5b0n:10250/metrics/resource\": dial tcp: lookup master-europe-west3-c-5b0n on 100.64.0.10:53: no such host" node="master-europe-west3-c-5b0n"
E1202 09:58:54.937612       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-a-dlc1"
E1202 09:58:54.937688       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-b-xh98:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-b-xh98"
E1202 09:59:09.938045       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-b-xh98:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-b-xh98"
E1202 09:59:09.938159       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-a-dlc1"
E1202 09:59:09.938221       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-c-5b0n:10250/metrics/resource\": dial tcp 10.0.32.5:10250: i/o timeout" node="master-europe-west3-c-5b0n"
E1202 09:59:11.492392       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-b-xh98:10250/metrics/resource\": dial tcp: lookup master-europe-west3-b-xh98 on 100.64.0.10:53: no such host" node="master-europe-west3-b-xh98"
E1202 09:59:24.938333       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-c-5b0n:10250/metrics/resource\": context deadline exceeded" node="master-europe-west3-c-5b0n"
```

Pod b:
```
E1202 10:14:28.118341       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:14:43.080964       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:14:43.108814       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:14:58.082350       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:14:58.112073       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:15:13.084207       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:15:13.121976       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:15:28.078819       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:15:28.107244       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:15:43.102142       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:15:43.111225       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:15:58.090505       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:15:58.134285       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:16:13.102149       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:16:13.104975       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:16:28.080763       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:16:28.107115       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:16:43.099951       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:16:43.129289       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:16:58.103055       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:16:58.104737       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:17:13.080889       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:17:13.122221       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:17:28.091874       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:17:28.101353       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:17:43.090045       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:17:43.096981       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:17:58.076076       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:17:58.078543       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:18:13.097178       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:18:13.135848       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:18:28.074794       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:18:28.089889       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:18:43.072307       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:18:43.087606       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:18:58.087551       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:18:58.098949       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:19:13.085428       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:19:13.116151       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:19:28.073051       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:19:28.075806       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:19:43.078198       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:19:43.131486       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:19:58.079025       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:19:58.119685       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:20:13.112296       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:20:13.126524       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:20:28.098628       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
E1202 10:20:28.113788       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:20:43.079137       1 scraper.go:140] "Failed to scrape node" err="Get \"https://master-europe-west3-a-dlc1:10250/metrics/resource\": dial tcp: lookup master-europe-west3-a-dlc1 on 100.64.0.10:53: no such host" node="master-europe-west3-a-dlc1"
E1202 10:20:43.121105       1 scraper.go:140] "Failed to scrape node" err="Get \"https://nodes-europe-west3-5vhx:10250/metrics/resource\": dial tcp: lookup nodes-europe-west3-5vhx on 100.64.0.10:53: no such host" node="nodes-europe-west3-5vhx"
```


**9. Anything else do we need to know?**


Pull request:
metrics-server: Set preferred address type to `InternalIP` when non AWS
Closes #14708 

/cc @olemarkus 

Patch:
diff --git a/upup/models/cloudup/resources/addons/metrics-server.addons.k8s.io/k8s-1.11.yaml.template b/upup/models/cloudup/resources/addons/metrics-server.addons.k8s.io/k8s-1.11.yaml.template
index 56bf935ad0..3d4825a0f7 100644
--- a/upup/models/cloudup/resources/addons/metrics-server.addons.k8s.io/k8s-1.11.yaml.template
+++ b/upup/models/cloudup/resources/addons/metrics-server.addons.k8s.io/k8s-1.11.yaml.template
@@ -132,7 +132,7 @@ spec:
           - --secure-port=4443
           - --kubelet-use-node-status-port
           - --metric-resolution=15s
-          - --kubelet-preferred-address-types={{ if or IsIPv6Only (eq GetCloudProvider "hetzner")}}InternalIP{{ else }}Hostname{{ end }}
+          - --kubelet-preferred-address-types={{ if or IsIPv6Only (not (eq GetCloudProvider "aws"))}}InternalIP{{ else }}Hostname{{ end }}
 {{ if not (WithDefaultBool .MetricsServer.Insecure true) }}
           - --tls-cert-file=/srv/tls.crt
           - --tls-private-key-file=/srv/tls.key


Test patch:
diff --git a/tests/integration/update_cluster/many-addons-gce/data/aws_s3_object_minimal.example.com-addons-bootstrap_content b/tests/integration/update_cluster/many-addons-gce/data/aws_s3_object_minimal.example.com-addons-bootstrap_content
index 1e1a0b7944..9d83910e84 100644
--- a/tests/integration/update_cluster/many-addons-gce/data/aws_s3_object_minimal.example.com-addons-bootstrap_content
+++ b/tests/integration/update_cluster/many-addons-gce/data/aws_s3_object_minimal.example.com-addons-bootstrap_content
@@ -48,7 +48,7 @@ spec:
     version: 9.99.0
   - id: k8s-1.11
     manifest: metrics-server.addons.k8s.io/k8s-1.11.yaml
-    manifestHash: 2c50298a62f772220623daac250303f2757a9393c63a441acd89f077f1b4c2f7
+    manifestHash: 1b89be4bcb1ed917bbd82781eebceec127f2d30eb13f6e5477e3e42f0cafc1b6
     name: metrics-server.addons.k8s.io
     needsPKI: true
     selector:
diff --git a/tests/integration/update_cluster/many-addons-gce/data/aws_s3_object_minimal.example.com-addons-metrics-server.addons.k8s.io-k8s-1.11_content b/tests/integration/update_cluster/many-addons-gce/data/aws_s3_object_minimal.example.com-addons-metrics-server.addons.k8s.io-k8s-1.11_content
index 2a95b2b19e..4130a7a0f8 100644
--- a/tests/integration/update_cluster/many-addons-gce/data/aws_s3_object_minimal.example.com-addons-metrics-server.addons.k8s.io-k8s-1.11_content
+++ b/tests/integration/update_cluster/many-addons-gce/data/aws_s3_object_minimal.example.com-addons-metrics-server.addons.k8s.io-k8s-1.11_content
@@ -170,7 +170,7 @@ spec:
         - --secure-port=4443
         - --kubelet-use-node-status-port
         - --metric-resolution=15s
-        - --kubelet-preferred-address-types=Hostname
+        - --kubelet-preferred-address-types=InternalIP
         - --cert-dir=/tmp
         - --kubelet-insecure-tls
         image: registry.k8s.io/metrics-server/metrics-server:v0.6.1