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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-8027) Setting hostname of docker container breaks for --net=host in docker 1.13
Date Wed, 14 Mar 2018 15:14:32 GMT

    [ https://issues.apache.org/jira/browse/YARN-8027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16398704#comment-16398704

Jason Lowe commented on YARN-8027:

Thanks for the patch!  Curious, is there any reason for YARN to want to change the hostname
of a container unless Registry DNS is enabled?  If not then I'm wondering if this simplifies
to just checking for Registry DNS being enabled.  Otherwise it looks OK to me.  However I'll
defer to [~billie.rinaldi] and [~shanekumpf@gmail.com] since they know far more about the
docker container requirements for native services in YARN.

> Setting hostname of docker container breaks for --net=host in docker 1.13
> -------------------------------------------------------------------------
>                 Key: YARN-8027
>                 URL: https://issues.apache.org/jira/browse/YARN-8027
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: yarn
>    Affects Versions: 3.0.0
>            Reporter: Jim Brennan
>            Assignee: Jim Brennan
>            Priority: Major
>         Attachments: YARN-8027.001.patch
> In DockerLinuxContainerRuntime:launchContainer, we are adding the --hostname argument
to the docker run command to set the hostname in the container to something like:  ctr-e84-1520889172376-0001-01-000001.
> This does not work when combined with the --net=host command line option in Docker 1.13.1.
 It causes multiple failures when the client tries to resolve the hostname and it fails.
> We haven't seen this before because we were using docker 1.12.6 which seems to ignore
--hostname when you are using --net=host.

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