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From "Suma Shivaprasad (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (YARN-7987) Docker container name(--name) needs to be DNS friendly for DNS resolution to work in user defined networks.
Date Mon, 12 Mar 2018 18:40:00 GMT

     [ https://issues.apache.org/jira/browse/YARN-7987?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Suma Shivaprasad resolved YARN-7987.
------------------------------------
    Resolution: Won't Fix

> Docker container name(--name) needs to be DNS friendly for DNS resolution to work in
user defined networks. 
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-7987
>                 URL: https://issues.apache.org/jira/browse/YARN-7987
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Suma Shivaprasad
>            Assignee: Suma Shivaprasad
>            Priority: Major
>
> User defined networks like overlays support DNS resolution through Docker Embedded DNS
which needs the container name (–name parameter value in docker run) to be a FQDN for container
names to be resolved - Please refer documentation [https://docs.docker.com/v17.09/engine/userguide/networking/configure-dns/]
> However Yarn sets the container name to the container's id which is not DNS friendly(eg: container_e26_1519402686002_0035_01_000003)
and is not a FQDN. 
> The proposal is to set a FQDN(eg: ctr-e26-1519402686002-0035-01-000003.domain-name)
as the docker container's name for containers to be able to communicate to each other via
hostnames in user defined networks like overlays, bridges etc. The domain name will be picked
up from the YARN DNS registry configuration (hadoop.registry.dns.domain-name)
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