Enable Scheduler Container Logs to Track Pod Placement

Problem

There is a requirement to track down the scheduling of the pods in the PMK cluster. The pod scheduling is not logged in the container logs located at /var/log/containers by default.

Environment

  • Platform9 Managed Kubernetes - All Versions

  • Kube-Scheduler

Procedure

Warning

Please ensure to apply the following procedure to one master node at a time.

  • Stop Hostagent and Nodeletd.

systemctl stop pf9-{hostagent,nodeletd}

  • Stop Nodelet Phases.

/opt/pf9/nodelet/nodeletd phases stop

  • Edit _ _/opt/pf9/pf9-kube/conf/masterconfig/base/<OS_NAME>/master.yaml on all the master nodes, setting the verbosity level to "--v=8" for the scheduler container command, e.g.

- name: "kube-scheduler"
image: "k8s.gcr.io/kube-scheduler:__KUBERNETES_VERSION__"
command:
- "kube-scheduler"
- "--config=/srv/kubernetes/configs/kube-scheduler.yaml"
- "--leader-elect=true"
- "--profiling=false"
- "--v=8"

  • Start Hostagent

systemctl start pf9-hostagent

  • Verify the change

ps -ef | grep -i kube-sched
Success

Once the above procedure is applied to all master nodes, the scheduler events for pod placement can be observed in the scheduler container logs.


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Enable Scheduler Container Logs to Track Pod PlacementProblemEnvironmentProcedure