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https://issues.apache.org/jira/browse/YARN-9923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16957379#comment-16957379
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Eric Badger commented on YARN-9923:
-----------------------------------
Isn't it more appropriate for this to be in the nm health check script? The
docker daemon can (and will....) go down at any time due to a bug or other
random issue. But we don't want to do this check before every container that we
start. So if a user chose the RUNTIME option, the only way I see this working
is to have a thread periodically checking whether docker is installed and
running. But that's exactly what the nm health check script does.
> Detect missing Docker binary or not running Docker daemon
> ---------------------------------------------------------
>
> Key: YARN-9923
> URL: https://issues.apache.org/jira/browse/YARN-9923
> Project: Hadoop YARN
> Issue Type: New Feature
> Components: nodemanager, yarn
> Affects Versions: 3.2.1
> Reporter: Adam Antal
> Assignee: Adam Antal
> Priority: Major
>
> Currently if a NodeManager is enabled to allocate Docker containers, but the
> specified binary (docker.binary in the container-executor.cfg) is missing the
> container allocation fails with the following error message:
> {noformat}
> Container launch fails
> Exit code: 29
> Exception message: Launch container failed
> Shell error output: sh: <docker binary path, /usr/bin/docker by default>: No
> such file or directory
> Could not inspect docker network to get type /usr/bin/docker network inspect
> host --format='{{.Driver}}'.
> Error constructing docker command, docker error code=-1, error
> message='Unknown error'
> {noformat}
> I suggest to add a property say "yarn.nodemanager.runtime.linux.docker.check"
> to have the following options:
> - STARTUP: setting this option the NodeManager would not start if Docker
> binaries are missing or the Docker daemon is not running (the exception is
> considered FATAL during startup)
> - RUNTIME: would give a more detailed/user-friendly exception in
> NodeManager's side (NM logs) if Docker binaries are missing or the daemon is
> not working. This would also prevent further Docker container allocation as
> long as the binaries do not exist and the docker daemon is not running.
> - NONE (default): preserving the current behaviour, throwing exception during
> container allocation, carrying on using the default retry procedure.
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