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Update configuring Docker article 

Signed-off-by: Jeff Johnston <jeff.johnston.mn@gmail.com>
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Jeff Johnston 2015-12-12 20:36:48 -06:00
parent 51ffc088a5
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docs/articles/configuring.md
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@ -170,34 +170,42 @@ If you want Docker to start at boot, you should also:
### Configuring Docker ### Configuring Docker
You configure the `docker` daemon in the `/etc/sysconfig/docker` file on your For CentOS 7.x and RHEL 7.x you can [control and configure Docker with systemd](systemd.md).
host. You do this by specifying values in a variable. For CentOS 7.x and RHEL 7.x, the name
of the variable is `OPTIONS` and for CentOS 6.x and RHEL 6.x, the name of the variable is
`other_args`. For this section, we will use CentOS 7.x as an example to configure the `docker`
daemon.
By default, systemd services are located either in `/etc/systemd/service`, `/lib/systemd/system` Previously, for CentOS 6.x and RHEL 6.x you would configure the `docker` daemon in
or `/usr/lib/systemd/system`. The `docker.service` file can be found in either of these three the `/etc/sysconfig/docker` file on your system. You would do this by specifying
directories depending on your host. values in a `other_args` variable. For a short time in CentOS 7.x and RHEL 7.x you
would specify values in a `OPTIONS` variable. This is no longer recommended in favor
of using systemd directly.
For this section, we will use CentOS 7.x as an example to configure the `docker` daemon.
To configure Docker options: To configure Docker options:
1. Log into your host as a user with `sudo` or `root` privileges. 1. Log into your host as a user with `sudo` or `root` privileges.
2. If you don't have one, create the `/etc/sysconfig/docker` file on your host. Depending on how 2. Create the `/etc/systemd/system/docker.service.d` directory.
you installed Docker, you may already have this file.
3. Open the file with your favorite editor.
``` ```
$ sudo vi /etc/sysconfig/docker $ sudo mkdir /etc/systemd/system/docker.service.d
``` ```
4. Add a `OPTIONS` variable with the following options. These options are appended to the 3. Create a `/etc/systemd/system/docker.service.d/docker.conf` file.
command that starts the `docker` daemon.
4. Open the file with your favorite editor.
```
$ sudo vi /etc/systemd/system/docker.service.d/docker.conf
```
5. Override the `ExecStart` configuration from your `docker.service` file to customize
the `docker` daemon. To modify the `ExecStart` configuration you have to specify
an empty configuration followed by a new one as follows:
``` ```
OPTIONS="-D --tls=true --tlscert=/var/docker/server.pem --tlskey=/var/docker/serverkey.pem -H tcp://192.168.59.3:2376" [Service]
ExecStart=
ExecStart=/usr/bin/docker daemon -H fd:// -D --tls=true --tlscert=/var/docker/server.pem --tlskey=/var/docker/serverkey.pem -H tcp://192.168.59.3:2376
``` ```
These options : These options :
@ -209,15 +217,21 @@ These options :
The command line reference has the [complete list of daemon flags](../reference/commandline/daemon.md) The command line reference has the [complete list of daemon flags](../reference/commandline/daemon.md)
with explanations. with explanations.
5. Save and close the file. 6. Save and close the file.
6. Restart the `docker` daemon. 7. Flush changes.
```
$ sudo systemctl daemon-reload
```
8. Restart the `docker` daemon.
``` ```
$ sudo systemctl restart docker $ sudo systemctl restart docker
``` ```
7. Verify that the `docker` daemon is running as specified with the `ps` command. 9. Verify that the `docker` daemon is running as specified with the `ps` command.
``` ```
$ ps aux | grep docker | grep -v grep $ ps aux | grep docker | grep -v grep