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Merge pull request #30523 from nathanleclaire/document_init 

Document --init flag for docker run
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Misty Stanley-Jones 2017-02-07 09:28:30 -08:00 committed by GitHub
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docs/reference/run.md
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@ -667,7 +667,18 @@ It also causes any seccomp filters to be applied later, after privileges have be
which may mean you can have a more restrictive set of filters.
For more details, see the [kernel documentation](https://www.kernel.org/doc/Documentation/prctl/no_new_privs.txt).
## Specifying custom cgroups
## Specify an init process
You can use the `--init` flag to indicate that an init process should be used as
the PID 1 in the container. Specifying an init process ensures the usual
responsibilities of an init system, such as reaping zombie processes, are
performed inside the created container.
The default init process used is the first `docker-init` executable found in the
system path of the Docker daemon process. This `docker-init` binary, included in
the default installation, is backed by [tini](https://github.com/krallin/tini).
## Specify custom cgroups
Using the `--cgroup-parent` flag, you can pass a specific cgroup to run a
container in. This allows you to create and manage cgroups on their own. You can