[jira] [Commented] (FLINK-15792) Make Flink logs accessible via kubectl logs per default

["Yang Wang (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-15792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17026534#comment-17026534 ] 

Yang Wang commented on FLINK-15792:
-----------------------------------

[~trohrmann] Do you mean to add a new {{log4j-kubernetes.properties}}? We will add the {{ConsoleAppender}} and set {{log4j.rootLogger=INFO, file, console}} just as the doc[1].

Also we need to remove the redirect args by default. It means to update the default value of {{kubernetes.container-start-command-template}} to {{%java% %classpath% %jvmmem% %jvmopts% %logging% %class% %args%}}.

 

[1]. [https://ci.apache.org/projects/flink/flink-docs-master/ops/deployment/native_kubernetes.html#log-files]

> Make Flink logs accessible via kubectl logs per default
> -------------------------------------------------------
>
>                 Key: FLINK-15792
>                 URL: https://issues.apache.org/jira/browse/FLINK-15792
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Deployment / Kubernetes
>    Affects Versions: 1.10.0
>            Reporter: Till Rohrmann
>            Priority: Major
>             Fix For: 1.11.0, 1.10.1
>
>
> I think we should make Flink's logs accessible via {{kubectl logs}} per default. Firstly, this is the idiomatic way to obtain the logs from a container on Kubernetes. Secondly, especially if something does not work and the container cannot start/stops abruptly, there is no way to log into the container and look for the log.file. This makes debugging the setup quite hard.
> I think the best way would be to create the Flink Docker image in such a way that it logs to stdout. In order to allow access to the log file from the web ui, it should also create a log file. One way to achieve this is to add a ConsoleAppender to the respective logging configuration. Another way could be to start the process in the console mode and then to teeing the stdout output into the log file.



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