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Posted to issues@flink.apache.org by "Till Rohrmann (Jira)" <ji...@apache.org> on 2020/02/03 13:46:00 UTC
[jira] [Commented] (FLINK-15792) Make Flink logs accessible via
kubectl logs per default
[ https://issues.apache.org/jira/browse/FLINK-15792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17028949#comment-17028949 ]
Till Rohrmann commented on FLINK-15792:
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Hmm, I'm wondering whether introducing yet another log4j properties file is the right approach here. Imagine you as a user want to configure the logging and you see 5 different log4j properties file in {{/conf}}. You might ask yourself which file you actually need to touch.
Ideally we don't have ten different ways of how to configure logging but only a few which generalize well so that they can be used for all kinds of different deployments.
> 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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