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Clarify that nproc is not for per container

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Fix ulimit nproc spec in daemon

Signed-off-by: Harry Zhang <harryzhang@zju.edu.cn>
This commit is contained in:
Harry Zhang 2015-06-28 22:40:53 +08:00
parent 7571e6d900
commit 54ac3ad736
2 changed files with 20 additions and 0 deletions
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4
docs/reference/commandline/daemon.md
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@ -446,6 +446,10 @@ these defaults are not set, `ulimit` settings will be inherited, if not set on
`docker run`, from the Docker daemon. Any `--ulimit` options passed to
`docker run` will overwrite these defaults.
Be careful setting `nproc` with the `ulimit` flag as `nproc` is designed by Linux to
set the maximum number of processes available to a user, not to a container. For details
please check the [run](run.md) reference.
## Miscellaneous options
IP masquerading uses address translation to allow containers without a public

16
docs/reference/commandline/run.md
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@ -479,3 +479,19 @@ available in the default container, you can set these using the `--ulimit` flag.
The values are sent to the appropriate `syscall` as they are set.
Docker doesn't perform any byte conversion. Take this into account when setting the values.
#### For `nproc` usage:
Be careful setting `nproc` with the `ulimit` flag as `nproc` is designed by Linux to set the
maximum number of processes available to a user, not to a container. For example, start four
containers with `daemon` user:
docker run -d -u daemon --ulimit nproc=3 busybox top
docker run -d -u daemon --ulimit nproc=3 busybox top
docker run -d -u daemon --ulimit nproc=3 busybox top
docker run -d -u daemon --ulimit nproc=3 busybox top
The 4th container fails and reports "[8] System error: resource temporarily unavailable" error.
This fails because the caller set `nproc=3` resulting in the first three containers using up
the three processes quota set for the `daemon` user.