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Re: Support for Kubernetes metadata when using docker --log-driver=journald?



We could support setting that on the Kubelet when we launch the
containers.  I think it's reasonable - if you open a Kube issue Derek
and I can chime in.

On Fri, May 20, 2016 at 12:12 PM, Rich Megginson <rmeggins redhat com> wrote:
> When using OpenShift with the standard docker log driver, there are
> container logs in the following format:
>
> /var/log/containers/$name_of_pod-$name_of_project-$name_of_container-$containeruuid.log
>
> The fluentd log collector uses $name_of_pod and $name_of_project to look up
> in k8s additional metadata for the pod and project (such as the uuids).
>
> When using docker daemon --log-driver=journald, these files no longer exist,
> and the journal entries are missing $name_of_pod and $name_of_project in the
> metadata:
>
> __CURSOR=s=7c08f275b8a545a9afb1770ef779ebb8;i=3148;b=caa653694cfa4a6ea9e4213e6cf4065b;m=13700ce9;t=53347368f6904;x=770aebf7b30ab7b3
> __REALTIME_TIMESTAMP=1463755834616068
> ...
> _COMM=docker-current
> _EXE=/usr/bin/docker-current
> _CMDLINE=/usr/bin/docker-current daemon
> --authorization-plugin=rhel-push-plugin --selinux-enabled
> --log-driver=journald
> CONTAINER_ID=a160de6fe8fa
> CONTAINER_ID_FULL=a160de6fe8facb49103c45f2bd14854b455b42153b777634ea58fb8a95124a40
> CONTAINER_NAME=silly_bhaskara
>
> When running containers via docker directly, you can use -e and -l to pass
> additional metadata through to the journal output:
>   docker run -e FOOT=BALL -l LA=SF --rm --name toasted \
>       --log-driver=journald --log-opt env=FOOT --log-opt labels=LA \
>       fedora /bin/pwd
>
>  MESSAGE=/
>  CONTAINER_NAME=toasted
>  LA=SF
>  FOOT=BALL
>  CONTAINER_ID=37772f57b118
>
> CONTAINER_ID_FULL=37772f57b1189306fed624675cd33412461a6f04ff0f4d7a4ea5d1d41f637641
>
> Is there some way to make k8s and/or OpenShift add fields like
> K8S_POD_NAME=$name_of_pod and
> K8S_NAMESPACE_NAME=$name_of_project to the journal entries?
> This will also be needed by
> https://github.com/fabric8io/fluent-plugin-kubernetes_metadata_filter which
> assumes the entries are tagged in a similar format to the filename above.
> Of course if k8s/openshift can be configured to automatically add that
> additional metadata to the journal entries then the fluentd k8s metadata
> plugin might not be needed.
>
>
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>


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