Rancher HA

The commands/steps listed on this page can be used to check your Rancher Kubernetes Installation.

Make sure you configured the correct kubeconfig (for example, export KUBECONFIG=$PWD/kube_config_rancher-cluster.yml).

Check Rancher pods

Rancher pods are deployed as a Deployment in the cattle-system namespace.

Check if the pods are running on all nodes:

kubectl -n cattle-system get pods -l app=rancher -o wide

Example output:

NAME                       READY   STATUS    RESTARTS   AGE   IP          NODErancher-7dbd7875f7-n6t5t   1/1     Running   0          8m    x.x.x.x     x.x.x.xrancher-7dbd7875f7-qbj5k   1/1     Running   0          8m    x.x.x.x     x.x.x.xrancher-7dbd7875f7-qw7wb   1/1     Running   0          8m    x.x.x.x     x.x.x.x

If a pod is unable to run (Status is not Running, Ready status is not showing 1/1 or you see a high count of Restarts), check the pod details, logs and namespace events.

Pod details

kubectl -n cattle-system describe pods -l app=rancher

Pod container logs

kubectl -n cattle-system logs -l app=rancher

Namespace events

kubectl -n cattle-system get events

Check ingress

Ingress should have the correct HOSTS (showing the configured FQDN) and ADDRESS (host address(es) it will be routed to).

kubectl -n cattle-system get ingress

Example output:

NAME      HOSTS                    ADDRESS                   PORTS     AGErancher   rancher.yourdomain.com   x.x.x.x,x.x.x.x,x.x.x.x   80, 443   2m

Check ingress controller logs

When accessing your configured Rancher FQDN does not show you the UI, check the ingress controller logging to see what happens when you try to access Rancher:

kubectl -n ingress-nginx logs -l app=ingress-nginx

Leader election

The leader is determined by a leader election process. After the leader has been determined, the leader (holderIdentity) is saved in the cattle-controllers ConfigMap (in this example, rancher-7dbd7875f7-qbj5k).

kubectl -n kube-system get configmap cattle-controllers -o jsonpath='{.metadata.annotations.control-plane\.alpha\.kubernetes\.io/leader}'{"holderIdentity":"rancher-7dbd7875f7-qbj5k","leaseDurationSeconds":45,"acquireTime":"2019-04-04T11:53:12Z","renewTime":"2019-04-04T12:24:08Z","leaderTransitions":0}