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From "Shane Kumpf (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-8027) Setting hostname of docker container breaks for --net=host in docker 1.13
Date Tue, 13 Mar 2018 14:01:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-8027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16396967#comment-16396967
] 

Shane Kumpf commented on YARN-8027:
-----------------------------------

Honoring the YARN provided hostname was discussed a bit in YARN-7797 and YARN-7935, however,
it seems that decision to keep the YARN generated hostname breaks down in a few places, namely
for deployments not running Registry DNS. Being able to validate Registry DNS, even when --net=host,
does have value, but it may not be worth the trade off.

Few options I can think of:
 # Check the configuration to determine if Registry DNS is enabled. If disabled, don't set
the --hostname. If enabled, set the --hostname.
 # Don't set the --hostname if --net=host in all cases.
 # Add a configuration flag to toggle this behavior for --net=host containers (something like:
yarn.nodemanager.runtime.linux.docker.network.host.use-yarn-generated-hostname), decoupling
the dependency on the Registry DNS.

Option #2 would provide consistency in the case where Docker ignores the --hostname flag,
but makes it impossible for a user to achieve the current behavior. I'm struggling with a
use case where we would want to set --hostname without Registry DNS, so #1 seems more appropriate
than adding a new config called out in #3, but maybe others can think of a case where decoupling
the configuration from Registry DNS makes sense.

> 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
>
> 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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