Print pod name in kubectl logs when using label selector

[nvartolomei]

Add kubectl logs flag to include pod name on each line in log output. Similar to docker-compose logs. Ideally behind a flag.

[0xmichalis]

@kubernetes/sig-cli-feature-requests @kubernetes/sig-api-machinery-misc

[smarterclayton]

Is there a capsule design for label selected pods for logs?

[adohe-zz]

imho, no such capsule design, should we add one for this? @smarterclayton

[nvartolomei]

What does "capsule design" mean?

[timothysc]

Just wondering why we couldn't do something very general like pass a formatting modifier string as a flag to other CLI command. Similar to server side queries but more general.

xref: http://research.cs.wisc.edu/htcondor/manual/current/condor_status.html see -format

[mbohlool]

This does seem like a feature request for kubectl. If it needs a feature from server, please file a separate issue.

[smarterclayton]

The API server would potentially need to support multiple streams of logs coming back from a pod, depending on the implementation. Which is why I asked what the design would be.

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[Nowaker]

This would be really helpful. A flag like --pod-names would play well with existing option --timestamps. CC @kubernetes/sig-cli-feature-requests

[k8s-ci-robot]

@Nowaker: Reiterating the mentions to trigger a notification:
@kubernetes/sig-cli-feature-requests

In response to this:

This would be really helpful. A flag like --pod-names would play well with existing option --timestamps. CC @kubernetes/sig-cli-feature-requests

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[Nowaker]

Could someone from @kubernetes/sig-cli-feature-requests take a look at this and comment, please? Thanks!

[k8s-ci-robot]

@Nowaker: Reiterating the mentions to trigger a notification:
@kubernetes/sig-cli-feature-requests

In response to this:

Could someone from @kubernetes/sig-cli-feature-requests take a look at this and comment, please? Thanks!

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[soltysh]

/lifecycle rotten
/remove-lifecycle stale

[soltysh]

/remove-lifecycle rotten
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[captain-kark]

Update: I'm trying out https://github.com/wercker/stern instead.

---

Hopefully this helps someone, I've only tested it very briefly on darwin/BSD.

function kublogs {
  __label_args=${@:1:2}
  __logs_args=${@:3}
  kubectl get po $__label_args -o name | cut -d / -f 2 | xargs -I{} bash -c 'sed -E "s/([0-9]{5})([0-9]+)?Z/\1Z $1/" <(kubectl logs $1 --timestamps ${@:2})' echo {} $__logs_args
}

kublogs -l app=my-deployment --since 1h -c some-container

It will print the timestamp first, but will be run against each pod individually. Pipe through sort to merge all pod logs together in the order they happened in the cluster.

[Nowaker]

Can't live without https://github.com/johanhaleby/kubetail. Simple syntax, colored output (different color per pod).

[muvster]

Now available in the form of --prefix: #76471