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https://issues.apache.org/jira/browse/YARN-7430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16244910#comment-16244910
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Eric Badger commented on YARN-7430:
-----------------------------------
{quote}
For users on LDAP, there is no good way to populate container with user and
group information.
{quote}
Additionally, bind-mounting the /var/run/nscd will allow the container to use
the host's ldap configuration to lookup users. That way, there won't be a cache
miss everytime a new container is started up. We could setup each container to
correctly use ldap, but that sounds like a waste because of all of the hits on
the ldap server. That's why entering the container as a uid:gid pair will give
you the username even if they don't exist in the image. Otherwise, the uid:gid
pair won't have an associated username and the MRAppMaster will fail. This was
discussed shortly in
[YARN-4266|https://issues.apache.org/jira/browse/YARN-4266?focusedCommentId=16076756&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16076756]
> User and Group mapping are incorrect in docker container
> --------------------------------------------------------
>
> Key: YARN-7430
> URL: https://issues.apache.org/jira/browse/YARN-7430
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: security, yarn
> Affects Versions: 2.9.0, 3.0.0
> Reporter: Eric Yang
> Assignee: Eric Yang
> Priority: Blocker
> Attachments: YARN-7430.001.patch
>
>
> In YARN-4266, the recommendation was to use -u [uid]:[gid] numeric values to
> enforce user and group for the running user. In YARN-6623, this translated
> to --user=test --group-add=group1. The code no longer enforce group
> correctly for launched process.
> In addition, the implementation in YARN-6623 requires the user and group
> information to exist in container to translate username and group to uid/gid.
> For users on LDAP, there is no good way to populate container with user and
> group information.
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