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Document --init flag for docker run 

Signed-off-by: Nathan LeClaire <nathan.leclaire@gmail.com>
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Nathan LeClaire 2017-01-27 15:27:33 -08:00 committed by Tibor Vass
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docs/reference/run.md
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@ -667,6 +667,17 @@ 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 an init process
You can use the `--init` or `--init-path` flags to specify a process which
should be used as the PID 1 in the container, and which binary to use for this
init process, respectively. Specifying an init process ensures the usual
responsibilties of an init system, such as reaping zombie processes, are
performed inside the created container.
The default init process used when specifying `--init` without `--init-path` is
[tini](https://github.com/krallin/tini).
## Specifying custom cgroups
Using the `--cgroup-parent` flag, you can pass a specific cgroup to run a