Chapter 2. Understanding networking settings Learn how to apply networking customization and default settings to MicroShift deployments. Each node is contained to a single machine and single MicroShift, so each deployment requires individual configuration, pods, and settings. Cluster Administrators have several options for exposing applications that run inside a cluster to external traffic and securing network connections: A service such as NodePort API resources, such as Ingress and Route By default, Kubernetes allocates each pod an internal IP address for applications running within the pod. Pods and their containers can have traffic between them, but clients outside the cluster do not have direct network access to pods except when exposed with a service such as NodePort. 2.1. Creating an OVN-Kubernetes configuration file MicroShift uses built-in default OVN-Kubernetes values if an OVN-Kubernetes configuration file is not created. You can write an OVN-Kubernetes configuration file to /etc/microshift/ovn.yaml . An example file is provided for your configuration. Procedure To create your ovn.yaml file, run the following command: USD sudo cp /etc/microshift/ovn.yaml.default /etc/microshift/ovn.yaml To list the contents of the configuration file you created, run the following command: USD cat /etc/microshift/ovn.yaml Example YAML file with default maximum transmission unit (MTU) value mtu: 1400 To customize your configuration, you can change the MTU value. The table that follows provides details: Table 2.1. Supported optional OVN-Kubernetes configurations for MicroShift Field Type Default Description Example mtu uint32 auto MTU value used for the pods 1300 Important If you change the mtu configuration value in the ovn.yaml file, you must restart the host that Red Hat build of MicroShift is running on to apply the updated setting. Example custom ovn.yaml configuration file mtu: 1300 2.2. Restarting the ovnkube-master pod The following procedure restarts the ovnkube-master pod. Prerequisites The OpenShift CLI ( oc ) is installed. Access to the cluster as a user with the cluster-admin role. A cluster installed on infrastructure configured with the OVN-Kubernetes network plugin. The KUBECONFIG environment variable is set. Procedure Use the following steps to restart the ovnkube-master pod. Access the remote cluster by running the following command: USD export KUBECONFIG=USDPWD/kubeconfig Find the name of the ovnkube-master pod that you want to restart by running the following command: USD pod=USD(oc get pods -n openshift-ovn-kubernetes | awk -F " " '/ovnkube-master/{print USD1}') Delete the ovnkube-master pod by running the following command: USD oc -n openshift-ovn-kubernetes delete pod USDpod Confirm that a new ovnkube-master pod is running by using the following command: USD oc get pods -n openshift-ovn-kubernetes The listing of the running pods shows a new ovnkube-master pod name and age. 2.3. Deploying MicroShift behind an HTTP or HTTPS proxy Deploy a MicroShift cluster behind an HTTP or HTTPS proxy when you want to add basic anonymity and security measures to your pods. You must configure the host operating system to use the proxy service with all components initiating HTTP or HTTPS requests when deploying MicroShift behind a proxy. All the user-specific workloads or pods with egress traffic, such as accessing cloud services, must be configured to use the proxy. There is no built-in transparent proxying of egress traffic in MicroShift. 2.4. Using the RPM-OStree HTTP or HTTPS proxy To use the HTTP or HTTPS proxy in RPM-OStree, you must add a Service section to the configuration file and set the http_proxy environment variable for the rpm-ostreed service. Procedure Add this setting to the /etc/systemd/system/rpm-ostreed.service.d/00-proxy.conf file: [Service] Environment="http_proxy=http://USDPROXY_USER:USDPROXY_PASSWORD@USDPROXY_SERVER:USDPROXY_PORT/" , reload the configuration settings and restart the service to apply your changes. Reload the configuration settings by running the following command: USD sudo systemctl daemon-reload Restart the rpm-ostreed service by running the following command: USD sudo systemctl restart rpm-ostreed.service 2.5. Using a proxy in the CRI-O container runtime To use an HTTP or HTTPS proxy in CRI-O , you must add a Service section to the configuration file and set the HTTP_PROXY and HTTPS_PROXY environment variables. You can also set the NO_PROXY variable to exclude a list of hosts from being proxied. Procedure Create the directory for the configuration file if it does not exist: USD sudo mkdir /etc/systemd/system/crio.service.d/ Add the following settings to the /etc/systemd/system/crio.service.d/00-proxy.conf file: [Service] Environment=NO_PROXY="localhost,127.0.0.1" Environment=HTTP_PROXY="http://USDPROXY_USER:USDPROXY_PASSWORD@USDPROXY_SERVER:USDPROXY_PORT/" Environment=HTTPS_PROXY="http://USDPROXY_USER:USDPROXY_PASSWORD@USDPROXY_SERVER:USDPROXY_PORT/" Important You must define the Service section of the configuration file for the environment variables or the proxy settings fail to apply. Reload the configuration settings: USD sudo systemctl daemon-reload Restart the CRI-O service: USD sudo systemctl restart crio Restart the MicroShift service to apply the settings: USD sudo systemctl restart microshift Verification Verify that pods are started by running the following command and examining the output: USD oc get all -A Verify that MicroShift is able to pull container images by running the following command and examining the output: USD sudo crictl images 2.6. Getting a snapshot of OVS interfaces from a running cluster A snapshot represents the state and data of OVS interfaces at a specific point in time. Procedure To see a snapshot of OVS interfaces from a running MicroShift cluster, use the following command: USD sudo ovs-vsctl show Example OVS interfaces in a running cluster 9d9f5ea2-9d9d-4e34-bbd2-dbac154fdc93 Bridge br-ex Port br-ex Interface br-ex type: internal Port patch-br-ex_localhost.localdomain-to-br-int 1 Interface patch-br-ex_localhost.localdomain-to-br-int type: patch options: {peer=patch-br-int-to-br-ex_localhost.localdomain} 2 Bridge br-int fail_mode: secure datapath_type: system Port patch-br-int-to-br-ex_localhost.localdomain Interface patch-br-int-to-br-ex_localhost.localdomain type: patch options: {peer=patch-br-ex_localhost.localdomain-to-br-int} Port eebee1ce5568761 Interface eebee1ce5568761 3 Port b47b1995ada84f4 Interface b47b1995ada84f4 4 Port "3031f43d67c167f" Interface "3031f43d67c167f" 5 Port br-int Interface br-int type: internal Port ovn-k8s-mp0 6 Interface ovn-k8s-mp0 type: internal ovs_version: "2.17.3" 1 The patch-br-ex_localhost.localdomain-to-br-int and patch-br-int-to-br-ex_localhost.localdomain are OVS patch ports that connect br-ex and br-int . 2 The patch-br-ex_localhost.localdomain-to-br-int and patch-br-int-to-br-ex_localhost.localdomain are OVS patch ports that connect br-ex and br-int . 3 The pod interface eebee1ce5568761 is named with the first 15 bits of the pod sandbox ID and is plugged into the br-int bridge. 4 The pod interface b47b1995ada84f4 is named with the first 15 bits of the pod sandbox ID and is plugged into the br-int bridge. 5 The pod interface 3031f43d67c167f is named with the first 15 bits of the pod sandbox ID and is plugged into the br-int bridge. 6 The OVS internal port for hairpin traffic, ovn-k8s-mp0 is created by the ovnkube-master container. 2.7. The MicroShift LoadBalancer service for workloads MicroShift has a built-in implementation of network load balancers that you can use for your workloads and applications within the cluster. You can create a LoadBalancer service by configuring a pod to interpret ingress rules and serve as an ingress controller. The following procedure gives an example of a deployment-based LoadBalancer service. 2.8. Deploying a load balancer for an application The following example procedure uses the node IP address as the external IP address for the LoadBalancer service configuration file. Use this example as guidance for how to deploy load balancers. Prerequisites The OpenShift CLI ( oc ) is installed. You installed a cluster on an infrastructure configured with the OVN-Kubernetes network plugin. The KUBECONFIG environment variable is set. Procedure Verify that your pods are running by entering the following command: USD oc get pods -A Example output NAMESPACE NAME READY STATUS RESTARTS AGE default i-06166fbb376f14a8bus-west-2computeinternal-debug-qtwcr 1/1 Running 0 46m kube-system csi-snapshot-controller-5c6586d546-lprv4 1/1 Running 0 51m openshift-dns dns-default-45jl7 2/2 Running 0 50m openshift-dns node-resolver-7wmzf 1/1 Running 0 51m openshift-ingress router-default-78b86fbf9d-qvj9s 1/1 Running 0 51m openshift-multus dhcp-daemon-j7qnf 1/1 Running 0 51m openshift-multus multus-r758z 1/1 Running 0 51m openshift-operator-lifecycle-manager catalog-operator-85fb86fcb9-t6zm7 1/1 Running 0 51m openshift-operator-lifecycle-manager olm-operator-87656d995-fvz84 1/1 Running 0 51m openshift-ovn-kubernetes ovnkube-master-5rfhh 4/4 Running 0 51m openshift-ovn-kubernetes ovnkube-node-gcnt6 1/1 Running 0 51m openshift-service-ca service-ca-bf5b7c9f8-pn6rk 1/1 Running 0 51m openshift-storage topolvm-controller-549f7fbdd5-7vrmv 5/5 Running 0 51m openshift-storage topolvm-node-rht2m 3/3 Running 0 50m Create a namespace by running the following commands: USD NAMESPACE=<nginx-lb-test> 1 1 Replace _<nginx-lb-test> with the application namespace that you want to create. USD oc create ns USDNAMESPACE Example namespace The following example deploys three replicas of the test nginx application in the created namespace: oc apply -n USDNAMESPACE -f - <<EOF apiVersion: v1 kind: ConfigMap metadata: name: nginx data: headers.conf: | add_header X-Server-IP \USDserver_addr always; --- apiVersion: apps/v1 kind: Deployment metadata: name: nginx spec: replicas: 3 selector: matchLabels: app: nginx template: metadata: labels: app: nginx spec: containers: - image: quay.io/packit/nginx-unprivileged imagePullPolicy: Always name: nginx ports: - containerPort: 8080 volumeMounts: - name: nginx-configs subPath: headers.conf mountPath: /etc/nginx/conf.d/headers.conf securityContext: allowPrivilegeEscalation: false seccompProfile: type: RuntimeDefault capabilities: drop: ["ALL"] runAsNonRoot: true volumes: - name: nginx-configs configMap: name: nginx items: - key: headers.conf path: headers.conf EOF You can verify that the three sample replicas started successfully by running the following command: USD oc get pods -n USDNAMESPACE Create a LoadBalancer service for the nginx test application by running the following command: oc create -n USDNAMESPACE -f - <<EOF apiVersion: v1 kind: Service metadata: name: nginx spec: ports: - port: 81 targetPort: 8080 selector: app: nginx type: LoadBalancer EOF Note You must ensure that the port parameter is a host port that is not occupied by other LoadBalancer services or MicroShift components. Verify that the service file exists, that the external IP address is properly assigned, and that the external IP is identical to the node IP by running the following command: USD oc get svc -n USDNAMESPACE Example output NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE nginx LoadBalancer 10.43.183.104 192.168.1.241 81:32434/TCP 2m Verification The following command forms five connections to the example nginx application using the external IP address of the LoadBalancer service configuration. The result of the command is a list of those server IP addresses. Verify that the load balancer sends requests to all the running applications by running the following command: EXTERNAL_IP=192.168.1.241 seq 5 | xargs -Iz curl -s -I http://USDEXTERNAL_IP:81 | grep X-Server-IP The output of the command contains different IP addresses if the LoadBalancer service is successfully distributing the traffic to the applications, for example: Example output X-Server-IP: 10.42.0.41 X-Server-IP: 10.42.0.41 X-Server-IP: 10.42.0.43 X-Server-IP: 10.42.0.41 X-Server-IP: 10.42.0.43 2.9. Blocking external access to the NodePort service on a specific host interface OVN-Kubernetes does not restrict the host interface where a NodePort service can be accessed from outside a Red Hat build of MicroShift node. The following procedure explains how to block the NodePort service on a specific host interface and restrict external access. Prerequisites You must have an account with root privileges. Procedure Change the NODEPORT variable to the host port number assigned to your Kubernetes NodePort service by running the following command: # export NODEPORT=30700 Change the INTERFACE_IP value to the IP address from the host interface that you want to block. For example: # export INTERFACE_IP=192.168.150.33 Insert a new rule in the nat table PREROUTING chain to drop all packets that match the destination port and IP address. For example: USD sudo nft -a insert rule ip nat PREROUTING tcp dport USDNODEPORT ip daddr USDINTERFACE_IP drop List the new rule by running the following command: USD sudo nft -a list chain ip nat PREROUTING table ip nat { chain PREROUTING { # handle 1 type nat hook prerouting priority dstnat; policy accept; tcp dport 30700 ip daddr 192.168.150.33 drop # handle 134 counter packets 108 bytes 18074 jump OVN-KUBE-ETP # handle 116 counter packets 108 bytes 18074 jump OVN-KUBE-EXTERNALIP # handle 114 counter packets 108 bytes 18074 jump OVN-KUBE-NODEPORT # handle 112 } } Note Note the handle number of the newly added rule. You need to remove the handle number in the following step. Remove the custom rule with the following sample command: USD sudo nft -a delete rule ip nat PREROUTING handle 134 2.10. The multicast DNS protocol You can use the multicast DNS protocol (mDNS) to allow name resolution and service discovery within a Local Area Network (LAN) using multicast exposed on the 5353/UDP port. MicroShift includes an embedded mDNS server for deployment scenarios in which the authoritative DNS server cannot be reconfigured to point clients to services on MicroShift. The embedded DNS server allows .local domains exposed by MicroShift to be discovered by other elements on the LAN. 2.11. Auditing exposed network ports On MicroShift, the host port can be opened by a workload in the following cases. You can check logs to view the network services. 2.11.1. hostNetwork When a pod is configured with the hostNetwork:true setting, the pod is running in the host network namespace. This configuration can independently open host ports. MicroShift component logs cannot be used to track this case, the ports are subject to firewalld rules. If the port opens in firewalld, you can view the port opening in the firewalld debug log. Prerequisites You have root user access to your build host. Procedure Optional: You can check that the hostNetwork:true parameter is set in your ovnkube-node pod by using the following example command: USD sudo oc get pod -n openshift-ovn-kubernetes <ovnkube-node-pod-name> -o json | jq -r '.spec.hostNetwork' true Enable debug in the firewalld log by running the following command: USD sudo vi /etc/sysconfig/firewalld FIREWALLD_ARGS=--debug=10 Restart the firewalld service: USD sudo systemctl restart firewalld.service To verify that the debug option was added properly, run the following command: USD sudo systemd-cgls -u firewalld.service The firewalld debug log is stored in the /var/log/firewalld path. Example logs for when the port open rule is added 2023-06-28 10:46:37 DEBUG1: config.getZoneByName('public') 2023-06-28 10:46:37 DEBUG1: config.zone.7.addPort('8080', 'tcp') 2023-06-28 10:46:37 DEBUG1: config.zone.7.getSettings() 2023-06-28 10:46:37 DEBUG1: config.zone.7.update('...') 2023-06-28 10:46:37 DEBUG1: config.zone.7.Updated('public') Example logs for when the port open rule is removed 2023-06-28 10:47:57 DEBUG1: config.getZoneByName('public') 2023-06-28 10:47:57 DEBUG2: config.zone.7.Introspect() 2023-06-28 10:47:57 DEBUG1: config.zone.7.removePort('8080', 'tcp') 2023-06-28 10:47:57 DEBUG1: config.zone.7.getSettings() 2023-06-28 10:47:57 DEBUG1: config.zone.7.update('...') 2023-06-28 10:47:57 DEBUG1: config.zone.7.Updated('public') 2.11.2. hostPort You can access the hostPort setting logs in MicroShift. The following logs are examples for the hostPort setting: Procedure You can access the logs by running the following command: USD journalctl -u crio | grep "local port" Example CRI-O logs when the host port is opened USD Jun 25 16:27:37 rhel92 crio[77216]: time="2023-06-25 16:27:37.033003098+08:00" level=info msg="Opened local port tcp:443" Example CRI-O logs when the host port is closed USD Jun 25 16:24:11 rhel92 crio[77216]: time="2023-06-25 16:24:11.342088450+08:00" level=info msg="Closing host port tcp:443" 2.11.3. NodePort and LoadBalancer services OVN-Kubernetes opens host ports for NodePort and LoadBalancer service types. These services add iptables rules that take the ingress traffic from the host port and forwards it to the clusterIP. Logs for the NodePort and LoadBalancer services are presented in the following examples: Procedure To access the name of your ovnkube-master pods, run the following command: USD oc get pods -n openshift-ovn-kubernetes | awk '/ovnkube-master/{print USD1}' Example ovnkube-master pod name ovnkube-master-n2shv You can access the NodePort and LoadBalancer services logs using your ovnkube-master pod and running the following example command: USD oc logs -n openshift-ovn-kubernetes <ovnkube-master-pod-name> ovnkube-master | grep -E "OVN-KUBE-NODEPORT|OVN-KUBE-EXTERNALIP" NodePort service: Example logs in the ovnkube-master container of the ovnkube-master pod when a host port is open USD I0625 09:07:00.992980 2118395 iptables.go:27] Adding rule in table: nat, chain: OVN-KUBE-NODEPORT with args: "-p TCP -m addrtype --dst-type LOCAL --dport 32718 -j DNAT --to-destination 10.96.178.142:8081" for protocol: 0 Example logs in the ovnkube-master container of the ovnkube-master pod when a host port is closed USD Deleting rule in table: nat, chain: OVN-KUBE-NODEPORT with args: "-p TCP -m addrtype --dst-type LOCAL --dport 32718 -j DNAT --to-destination 10.96.178.142:8081" for protocol: 0 LoadBalancer service: Example logs in the ovnkube-master container of the ovnkube-master pod when a host port is open USD I0625 09:34:10.406067 128902 iptables.go:27] Adding rule in table: nat, chain: OVN-KUBE-EXTERNALIP with args: "-p TCP -d 172.16.47.129 --dport 8081 -j DNAT --to-destination 10.43.114.94:8081" for protocol: 0 Example logs in the ovnkube-master container of the ovnkube-master pod when a host port is closed USD I0625 09:37:00.976953 128902 iptables.go:63] Deleting rule in table: nat, chain: OVN-KUBE-EXTERNALIP with args: "-p TCP -d 172.16.47.129 --dport 8081 -j DNAT --to-destination 10.43.114.94:8081" for protocol: 0

Commands:
sudo cp /etc/microshift/ovn.yaml.default /etc/microshift/ovn.yaml
cat /etc/microshift/ovn.yaml
mtu: 1400
mtu: 1300
export KUBECONFIG=USDPWD/kubeconfig
pod=USD(oc get pods -n openshift-ovn-kubernetes | awk -F " " '/ovnkube-master/{print USD1}')
oc -n openshift-ovn-kubernetes delete pod USDpod
oc get pods -n openshift-ovn-kubernetes
[Service] Environment="http_proxy=http://USDPROXY_USER:USDPROXY_PASSWORD@USDPROXY_SERVER:USDPROXY_PORT/"
sudo systemctl daemon-reload
sudo systemctl restart rpm-ostreed.service
sudo mkdir /etc/systemd/system/crio.service.d/
[Service] Environment=NO_PROXY="localhost,127.0.0.1" Environment=HTTP_PROXY="http://USDPROXY_USER:USDPROXY_PASSWORD@USDPROXY_SERVER:USDPROXY_PORT/" Environment=HTTPS_PROXY="http://USDPROXY_USER:USDPROXY_PASSWORD@USDPROXY_SERVER:USDPROXY_PORT/"
sudo systemctl daemon-reload
sudo systemctl restart crio
sudo systemctl restart microshift
oc get all -A
sudo crictl images
sudo ovs-vsctl show
9d9f5ea2-9d9d-4e34-bbd2-dbac154fdc93 Bridge br-ex Port br-ex Interface br-ex type: internal Port patch-br-ex_localhost.localdomain-to-br-int 1 Interface patch-br-ex_localhost.localdomain-to-br-int type: patch options: {peer=patch-br-int-to-br-ex_localhost.localdomain} 2 Bridge br-int fail_mode: secure datapath_type: system Port patch-br-int-to-br-ex_localhost.localdomain Interface patch-br-int-to-br-ex_localhost.localdomain type: patch options: {peer=patch-br-ex_localhost.localdomain-to-br-int} Port eebee1ce5568761 Interface eebee1ce5568761 3 Port b47b1995ada84f4 Interface b47b1995ada84f4 4 Port "3031f43d67c167f" Interface "3031f43d67c167f" 5 Port br-int Interface br-int type: internal Port ovn-k8s-mp0 6 Interface ovn-k8s-mp0 type: internal ovs_version: "2.17.3"
oc get pods -A
NAMESPACE NAME READY STATUS RESTARTS AGE default i-06166fbb376f14a8bus-west-2computeinternal-debug-qtwcr 1/1 Running 0 46m kube-system csi-snapshot-controller-5c6586d546-lprv4 1/1 Running 0 51m openshift-dns dns-default-45jl7 2/2 Running 0 50m openshift-dns node-resolver-7wmzf 1/1 Running 0 51m openshift-ingress router-default-78b86fbf9d-qvj9s 1/1 Running 0 51m openshift-multus dhcp-daemon-j7qnf 1/1 Running 0 51m openshift-multus multus-r758z 1/1 Running 0 51m openshift-operator-lifecycle-manager catalog-operator-85fb86fcb9-t6zm7 1/1 Running 0 51m openshift-operator-lifecycle-manager olm-operator-87656d995-fvz84 1/1 Running 0 51m openshift-ovn-kubernetes ovnkube-master-5rfhh 4/4 Running 0 51m openshift-ovn-kubernetes ovnkube-node-gcnt6 1/1 Running 0 51m openshift-service-ca service-ca-bf5b7c9f8-pn6rk 1/1 Running 0 51m openshift-storage topolvm-controller-549f7fbdd5-7vrmv 5/5 Running 0 51m openshift-storage topolvm-node-rht2m 3/3 Running 0 50m
NAMESPACE=<nginx-lb-test> 1
oc create ns USDNAMESPACE
apply -n USDNAMESPACE -f - <<EOF apiVersion: v1 kind: ConfigMap metadata: name: nginx data: headers.conf: | add_header X-Server-IP \USDserver_addr always; --- apiVersion: apps/v1 kind: Deployment metadata: name: nginx spec: replicas: 3 selector: matchLabels: app: nginx template: metadata: labels: app: nginx spec: containers: - image: quay.io/packit/nginx-unprivileged imagePullPolicy: Always name: nginx ports: - containerPort: 8080 volumeMounts: - name: nginx-configs subPath: headers.conf mountPath: /etc/nginx/conf.d/headers.conf securityContext: allowPrivilegeEscalation: false seccompProfile: type: RuntimeDefault capabilities: drop: ["ALL"] runAsNonRoot: true volumes: - name: nginx-configs configMap: name: nginx items: - key: headers.conf path: headers.conf EOF
oc get pods -n USDNAMESPACE
create -n USDNAMESPACE -f - <<EOF apiVersion: v1 kind: Service metadata: name: nginx spec: ports: - port: 81 targetPort: 8080 selector: app: nginx type: LoadBalancer EOF
oc get svc -n USDNAMESPACE
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE nginx LoadBalancer 10.43.183.104 192.168.1.241 81:32434/TCP 2m
EXTERNAL_IP=192.168.1.241 seq 5 | xargs -Iz curl -s -I http://USDEXTERNAL_IP:81 | grep X-Server-IP
X-Server-IP: 10.42.0.41 X-Server-IP: 10.42.0.41 X-Server-IP: 10.42.0.43 X-Server-IP: 10.42.0.41 X-Server-IP: 10.42.0.43
export NODEPORT=30700
export INTERFACE_IP=192.168.150.33
sudo nft -a insert rule ip nat PREROUTING tcp dport USDNODEPORT ip daddr USDINTERFACE_IP drop
sudo nft -a list chain ip nat PREROUTING table ip nat { chain PREROUTING { # handle 1 type nat hook prerouting priority dstnat; policy accept; tcp dport 30700 ip daddr 192.168.150.33 drop # handle 134 counter packets 108 bytes 18074 jump OVN-KUBE-ETP # handle 116 counter packets 108 bytes 18074 jump OVN-KUBE-EXTERNALIP # handle 114 counter packets 108 bytes 18074 jump OVN-KUBE-NODEPORT # handle 112 } }
sudo nft -a delete rule ip nat PREROUTING handle 134
sudo oc get pod -n openshift-ovn-kubernetes <ovnkube-node-pod-name> -o json | jq -r '.spec.hostNetwork' true
sudo vi /etc/sysconfig/firewalld FIREWALLD_ARGS=--debug=10
sudo systemctl restart firewalld.service
sudo systemd-cgls -u firewalld.service
2023-06-28 10:46:37 DEBUG1: config.getZoneByName('public') 2023-06-28 10:46:37 DEBUG1: config.zone.7.addPort('8080', 'tcp') 2023-06-28 10:46:37 DEBUG1: config.zone.7.getSettings() 2023-06-28 10:46:37 DEBUG1: config.zone.7.update('...') 2023-06-28 10:46:37 DEBUG1: config.zone.7.Updated('public')
2023-06-28 10:47:57 DEBUG1: config.getZoneByName('public') 2023-06-28 10:47:57 DEBUG2: config.zone.7.Introspect() 2023-06-28 10:47:57 DEBUG1: config.zone.7.removePort('8080', 'tcp') 2023-06-28 10:47:57 DEBUG1: config.zone.7.getSettings() 2023-06-28 10:47:57 DEBUG1: config.zone.7.update('...') 2023-06-28 10:47:57 DEBUG1: config.zone.7.Updated('public')
journalctl -u crio | grep "local port"
Jun 25 16:27:37 rhel92 crio[77216]: time="2023-06-25 16:27:37.033003098+08:00" level=info msg="Opened local port tcp:443"
Jun 25 16:24:11 rhel92 crio[77216]: time="2023-06-25 16:24:11.342088450+08:00" level=info msg="Closing host port tcp:443"
oc get pods -n openshift-ovn-kubernetes | awk '/ovnkube-master/{print USD1}'
ovnkube-master-n2shv
oc logs -n openshift-ovn-kubernetes <ovnkube-master-pod-name> ovnkube-master | grep -E "OVN-KUBE-NODEPORT|OVN-KUBE-EXTERNALIP"
I0625 09:07:00.992980 2118395 iptables.go:27] Adding rule in table: nat, chain: OVN-KUBE-NODEPORT with args: "-p TCP -m addrtype --dst-type LOCAL --dport 32718 -j DNAT --to-destination 10.96.178.142:8081" for protocol: 0
Deleting rule in table: nat, chain: OVN-KUBE-NODEPORT with args: "-p TCP -m addrtype --dst-type LOCAL --dport 32718 -j DNAT --to-destination 10.96.178.142:8081" for protocol: 0
I0625 09:34:10.406067 128902 iptables.go:27] Adding rule in table: nat, chain: OVN-KUBE-EXTERNALIP with args: "-p TCP -d 172.16.47.129 --dport 8081 -j DNAT --to-destination 10.43.114.94:8081" for protocol: 0
I0625 09:37:00.976953 128902 iptables.go:63] Deleting rule in table: nat, chain: OVN-KUBE-EXTERNALIP with args: "-p TCP -d 172.16.47.129 --dport 8081 -j DNAT --to-destination 10.43.114.94:8081" for protocol: 0