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	Update the manuals of docker and dockerd
Signed-off-by: yuexiao-wang <wang.yuexiao@zte.com.cn>
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			@ -7,12 +7,10 @@ docker \- Docker image and container command line interface
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# SYNOPSIS
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**docker** [OPTIONS] COMMAND [ARG...]
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**docker** daemon [--help|...]
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**docker** [--help|-v|--version]
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# DESCRIPTION
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is a client for interacting with the daemon (see **dockerd(8)**) through the CLI.
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**docker** is a client for interacting with the daemon (see **dockerd(8)**) through the CLI.
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The Docker CLI has over 30 commands. The commands are listed below and each has
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its own man page which explain usage and arguments.
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			@ -62,17 +60,7 @@ unix://[/path/to/socket] to use.
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Use "docker help" or "docker --help" to get an overview of available commands.
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# RUNTIME EXECUTION OPTIONS
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Use the **--exec-opt** flags to specify options to the execution driver.
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The following options are available:
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#### native.cgroupdriver
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Specifies the management of the container's `cgroups`. You can specify `cgroupfs`
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or `systemd`. If you specify `systemd` and it is not available, the system errors
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out.
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#### Client
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# EXAMPLES
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For specific client examples please see the man page for the specific Docker
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command. For example:
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			@ -672,6 +672,24 @@ For information about how to create an authorization plugin, see [authorization
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plugin](https://docs.docker.com/engine/extend/authorization/) section in the
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Docker extend section of this documentation.
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# RUNTIME EXECUTION OPTIONS
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You can configure the runtime using options specified with the `--exec-opt` flag.
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All the flag's options have the `native` prefix. A single `native.cgroupdriver`
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option is available.
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The `native.cgroupdriver` option specifies the management of the container's
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cgroups. You can only specify `cgroupfs` or `systemd`. If you specify
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`systemd` and it is not available, the system errors out. If you omit the
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`native.cgroupdriver` option,` cgroupfs` is used.
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This example sets the `cgroupdriver` to `systemd`:
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```bash
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$ sudo dockerd --exec-opt native.cgroupdriver=systemd
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```
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Setting this option applies to all containers the daemon launches.
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# HISTORY
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Sept 2015, Originally compiled by Shishir Mahajan <shishir.mahajan@redhat.com>
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