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Logging

CKE logs

cke is built on github.com/cybozu-go/well framework that provides standard logging options.

In addition, CKE records recent important operations in etcd. Use ckecli history to view them.

Kubernetes programs

CKE runs Kubernetes programs such as apiserver or kubelet by docker run --log-driver=journald to send their logs to journald.

To view logs of a program, use journalctl as follows:

$ sudo journalctl CONTAINER_NAME=kubelet

As kube-apiserver uses both stderr and stdout, filter its logs as follows.

To view general logs of a apiserver, use journalctl as follows:

$ sudo journalctl CONTAINER_NAME=kube-apiserver -p 3

You can send the audit log of a apiserver to either of journal log or file.

If the log is sent to journal log, you can see it using journalctl as follows:

$ sudo journalctl CONTAINER_NAME=kube-apiserver -p 6..6

Container names are defined in op/constants.go.

Ref: https://docs.docker.com/config/containers/logging/journald/#retrieve-log-messages-with-journalctl