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A comment on Docker 1.8 released. Parent comment

Re:Docker 1.8 released by cpuguy83 on Wednesday August 12, 2015 @11:56AM (#10048438)
Memory issues can be caused by a number of things. There's been a lot of work done to improve some leakages around the logging -- both by being able to disable logging if you don't need it or switch to a different logger, and general improvements to the default jsonlog logger.

There's also been a known issue around creating lots of `docker exec` instances and those references not being released (so you can query for status later), this is also resolved.

It would be awesome if you could profile it and submit a bug report with how you are using docker and where you are seeing memory growth. Let me know how I can help so we can get this resolved.

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Re:Docker 1.8 released by anh79 on Wednesday August 12, 2015 @06:16PM (#10051092)
Hi @cpuguy83,

Thanks for your feedback. I couldn't gather enough information for bug reporting (But I had few rich logs that told "docker" has invalid memory access.)

As a work-around, I use a special patch of docker-compose that helps the containers to restart automatically when "docker" daemon restarts :)

> There's also been a known issue around creating lots of `docker exec` instances and those references not being released (so you can query for status later), this is also resolved.

Woh, this seems my case, though I am not sure about "releasing" (We run "exec" and "exit"; we don't hold any "exec" for longer than 2 seconds.) I haven't seen this mentioned in changelog (FIXME). Let me try again in ticket system!

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Re:Docker 1.8 released by cpuguy83 on Wednesday August 12, 2015 @06:57PM (#10051317)
Yes, it's docker that was holding on to these exec instances (and cluttering up the `docker inspect` output if you do a bunch). We now do GC on these.

ps, you can add `reastart: always` to your compose file, and docker daemon will automatically restart those containers for you.

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Re:Docker 1.8 released by anh79 on Wednesday August 12, 2015 @10:31PM (#10051974)
Thanks a lot. I wonder why this is not mentioned in the changelog :)

Regarding the `docker-compose` issue, it's described here https://github.com/docker/compose/pull/1723 . Aanand Prasad has a better PR in https://github.com/docker/compose/pull/1754 (merged).

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