[jira] [Comment Edited] (YARN-8642) Add support for tmpfs mounts with the Docker runtime

["Craig Condit (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-8642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16595336#comment-16595336 ] 

Craig Condit edited comment on YARN-8642 at 8/28/18 7:24 PM:
-------------------------------------------------------------

[~ebadger], the regex is based on the one used for normal mounts. The container-executor process never uses these values in a shell context, but simply adds the entire value as an argument to exec(), which in turn is passed as the argument following {{--tmpfs}} in docker. I have verified that passing in things such as your example results in the mountpoint being literally named:
{noformat}
/foo/bar || <execute_bad_code>
{noformat}
This is expected.


was (Author: ccondit-target):
[~ebadger], the regex is based on the one used for normal mounts. The container-executor process never uses these values in a shell context, but simply adds the entire value as an argument to exec(), which in turn is passed as the argument following {{--tmpfs}} in docker. I have verified that passing in things such as your example results in the mountpoint being literally named:

{noformat}
. /foo/bar || <execute_bad_code>
{noformat}

This is expected.

> Add support for tmpfs mounts with the Docker runtime
> ----------------------------------------------------
>
>                 Key: YARN-8642
>                 URL: https://issues.apache.org/jira/browse/YARN-8642
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Shane Kumpf
>            Assignee: Craig Condit
>            Priority: Major
>              Labels: Docker
>         Attachments: YARN-8642.001.patch, YARN-8642.002.patch
>
>
> Add support to the existing Docker runtime to allow the user to request tmpfs mounts for their containers. For example:
> {code}/usr/bin/docker run --name=container_name --tmpfs /run image /bootstrap/start-systemd
> {code}
> One use case is to allow systemd to run as PID 1 in a non-privileged container, /run is expected to be a tmpfs mount in the container for that to work.



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