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.

Bash

systemctl stop pf9-{hostagent,nodeletd}

• Stop Nodelet Phases.

Bash

/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.

Bash

- 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

Bash

systemctl start pf9-hostagent

• Verify the change

None

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.