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https://issues.apache.org/jira/browse/YARN-5168?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16685660#comment-16685660
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Shane Kumpf edited comment on YARN-5168 at 11/13/18 7:46 PM:
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I believe supporting -P will lead to port conflicts. What if two containers
running on the same NM both expose 8080?
An alternative might be to support the "-p 8080" syntax (NOT "-p 8080:8080",
only the single port). With this syntax, docker will allocate an ephemeral port
on the NM and forward traffic to that port to 8080 in the container
(0.0.0.0:32768 -> container_ip:8080). This allows docker to manage the ports
and avoid conflict. The user would need to supply the list of ports they want
to expose at job submission time, likely via an env variable like we do with
networks.
was (Author: shaneku...@gmail.com):
I believe supporting -P will lead to port conflicts. What if two containers
running on the same NM both expose 8080?
An alternative might be to support the "-p 8080" syntax (NOT "-p 8080:8080",
only the single port). With this syntax, docker will allocate an ephemeral port
on the NM and forward traffic to that port to 8080 in the container
(0.0.0.0:32768 -> container_ip:8080). The user would need to supply the list of
ports they want to expose at job submission time, likely via an env variable
like we do with networks.
> Add port mapping handling when docker container use bridge network
> ------------------------------------------------------------------
>
> Key: YARN-5168
> URL: https://issues.apache.org/jira/browse/YARN-5168
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Jun Gong
> Assignee: Eric Yang
> Priority: Major
> Labels: Docker
>
> YARN-4007 addresses different network setups when launching the docker
> container. We need support port mapping when docker container uses bridge
> network.
> The following problems are what we faced:
> 1. Add "-P" to map docker container's exposed ports to automatically.
> 2. Add "-p" to let user specify specific ports to map.
> 3. Add service registry support for bridge network case, then app could find
> each other. It could be done out of YARN, however it might be more convenient
> to support it natively in YARN.
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