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Chapter 2. Troubleshooting a cluster
To begin troubleshooting a MicroShift cluster, first access the cluster status.
2.1. Checking the status of a cluster
You can check the status of a MicroShift cluster or see active pods. Given in the following procedure are three different commands you can use to check cluster status. You can choose to run one, two, or all commands to help you get the information you need to troubleshoot the cluster.
Procedure
Check the system status, which returns the cluster status, by running the following command:
$ sudo systemctl status microshift
If MicroShift fails to start, this command returns the logs from the previous run.
Example healthy output
● microshift.service - MicroShift Loaded: loaded (/usr/lib/systemd/system/microshift.service; enabled; preset: disabled) Active: active (running) since <day> <date> 12:39:06 UTC; 47min ago Main PID: 20926 (microshift) Tasks: 14 (limit: 48063) Memory: 542.9M CPU: 2min 41.185s CGroup: /system.slice/microshift.service └─20926 microshift run <Month-Day> 13:23:06 i-06166fbb376f14a8b.<hostname> microshift[20926]: kube-apiserver I0528 13:23:06.876001 20926 controll> <Month-Day> 13:23:06 i-06166fbb376f14a8b.<hostname> microshift[20926]: kube-apiserver I0528 13:23:06.876574 20926 controll> # ...Optional: Get comprehensive logs by running the following command:
$ sudo journalctl -u microshift
NoteThe default configuration of the
systemdjournal service stores data in a volatile directory. To persist system logs across system starts and restarts, enable log persistence and set limits on the maximum journal data size.Optional: If MicroShift is running, check the status of active pods by entering the following command:
$ 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 kube-system csi-snapshot-webhook-6bf8ddc7f5-kz6k9 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-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
NoteThis example output shows basic MicroShift. If you have installed optional RPMs, the status of pods running those services is also expected to be shown in your output.
