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https://issues.apache.org/jira/browse/YARN-8675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16592142#comment-16592142
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Jim Brennan commented on YARN-8675:
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[~suma.shivaprasad] Thanks for working on this. I am still not clear on
whether there exists any case in which we should be setting hostname when
net=host? As coded, if the YARN_CONTAINER_RUNTIME_DOCKER_CONTAINER_HOSTNAME
environment variable is set we will use it for hostname even if net=host. Is
this comment in DockerLinuxContainerRuntime.java still accurate?
{noformat}
* YARN_CONTAINER_RUNTIME_DOCKER_CONTAINER_HOSTNAME} sets the
* hostname to be used by the Docker container. If not specified, a
* hostname will be derived from the container ID. This variable is
* ignored if the network is 'host' and Registry DNS is not enabled.
{noformat}
> Setting hostname of docker container breaks with "host" networking mode for
> Apps which do not run as a YARN service
> -------------------------------------------------------------------------------------------------------------------
>
> Key: YARN-8675
> URL: https://issues.apache.org/jira/browse/YARN-8675
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Yesha Vora
> Assignee: Suma Shivaprasad
> Priority: Major
> Labels: Docker
> Attachments: YARN-8675.1.patch, YARN-8675.2.patch
>
>
> Applications like the Spark AM currently do not run as a YARN service and
> setting hostname breaks driver/executor communication if docker version
> >=1.13.1 , especially with wire-encryption turned on.
> YARN-8027 sets the hostname if YARN DNS is enabled. But the cluster could
> have a mix of YARN service/native Applications.
> The proposal is to not set the hostname when "host" networking mode is
> enabled.
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