98 lines
3.1 KiB
Markdown
98 lines
3.1 KiB
Markdown
page_title: Configuring Docker
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page_description: Configuring the Docker daemon on various distributions
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page_keywords: docker, daemon, configuration
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# Configuring Docker on various distributions
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After successfully installing Docker, the `docker` daemon runs with it's default
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configuration. You can configure the `docker` daemon by passing configuration
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flags to it directly when you start it.
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In a production environment, system administrators typically configure the
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`docker` daemon to start and stop according to an organization's requirements. In most
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cases, the system administrator configures a process manager such as `SysVinit`, `Upstart`,
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or `systemd` to manage the `docker` daemon's start and stop.
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Some of the daemon's options are:
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| Flag | Description |
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|-----------------------|-----------------------------------------------------------|
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| `-D`, `--debug=false` | Enable or disable debug mode. By default, this is false. |
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| `-H`,`--host=[]` | Daemon socket(s) to connect to. |
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| `--tls=false` | Enable or disable TLS. By default, this is false. |
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The command line reference has the [complete list of daemon flags](/reference/commandline/cli/#daemon).
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## Direct Configuration
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If you're running the `docker` daemon directly by running `docker -d` instead of using a process manager,
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you can append the config options to the run command directly.
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Here is a an example of running the `docker` daemon with config options:
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docker -d -D --tls=false -H tcp://0.0.0.0:2375
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These options :
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- Enable `-D` (debug) mode
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- Set `tls` to false
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- Listen for connections on `tcp://0.0.0.0:2375`
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## Ubuntu
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After successfully [installing Docker for Ubuntu](/installation/ubuntulinux/), you can check the
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running status using Upstart in this way:
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$ sudo status docker
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docker start/running, process 989
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You can start/stop/restart `docker` using
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$ sudo start docker
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$ sudo stop docker
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$ sudo restart docker
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### Configuring Docker
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You configure the `docker` daemon in the `/etc/default/docker` file on your
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system. You do this by specifying values in a `DOCKER_OPTS` variable.
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To configure Docker options:
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1. Log into your system as a user with `sudo` or `root` privileges.
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2. If you don't have one, create the `/etc/default/docker` file in your system.
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Depending on how you installed Docker, you may already have this file.
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3. Open the file with your favorite editor.
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$ sudo vi /etc/default/docker
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4. Add a `DOCKER_OPTS` variable with the following options. These options are appended to the
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`docker` daemon's run command.
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```
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DOCKER_OPTS=" --dns 8.8.8.8 --dns 8.8.4.4 -D --tls=false -H tcp://0.0.0.0:2375 "
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```
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These options :
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- Set `dns` server for all containers
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- Enable `-D` (debug) mode
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- Set `tls` to false
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- Listen for connections on `tcp://0.0.0.0:2375`
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5. Save and close the file.
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6. Restart the `docker` daemon.
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$ sudo restart docker
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7. Verify that the `docker` daemon is running as specified wit the `ps` command.
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$ ps aux | grep docker | grep -v grep
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