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https://issues.apache.org/jira/browse/YARN-7935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16418095#comment-16418095
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Eric Yang commented on YARN-7935:
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[~mridulm80] There is some concerns to expose the variables correctly, but the
value of this variable may be relative depending on looking outside into
docker, or inside docker transmitting out. If we agree on that the value of
CONTAINER_HOSTNAME needs to be what is visible inside the container. I am not
confident that computing InetAddress.getLocalHost().getHostName() in node
manager and net=host would provide the desired result in all scenarios (think
multi-homed environment). Can CONAINER_HOSTNAME be preset to match --hostname
on all conditions while satisfy the result? I think it's closer to what is
required, and only dependency is to make sure that RegistryDNS is deployed.
> Expose container's hostname to applications running within the docker
> container
> -------------------------------------------------------------------------------
>
> Key: YARN-7935
> URL: https://issues.apache.org/jira/browse/YARN-7935
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: yarn
> Reporter: Suma Shivaprasad
> Assignee: Suma Shivaprasad
> Priority: Major
> Attachments: YARN-7935.1.patch, YARN-7935.2.patch, YARN-7935.3.patch
>
>
> Some applications have a need to bind to the container's hostname (like
> Spark) which is different from the NodeManager's hostname(NM_HOST which is
> available as an env during container launch) when launched through Docker
> runtime. The container's hostname can be exposed to applications via an env
> CONTAINER_HOSTNAME. Another potential candidate is the container's IP but
> this can be addressed in a separate jira.
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