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105 lines
3.3 KiB
Markdown
105 lines
3.3 KiB
Markdown
page_title: Controlling and configuring Docker using Systemd
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page_description: Controlling and configuring Docker using Systemd
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page_keywords: docker, daemon, systemd, configuration
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# Controlling and configuring Docker using Systemd
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Many Linux distributions use systemd to start the Docker daemon. This document
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shows a few examples of how to customise Docker's settings.
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## Starting the Docker daemon
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Once Docker is installed, you will need to start the Docker daemon.
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$ sudo systemctl start docker
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# or on older distributions, you may need to use
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$ sudo service docker start
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If you want Docker to start at boot, you should also:
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$ sudo systemctl enable docker
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# or on older distributions, you may need to use
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$ sudo chkconfig docker on
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## Custom Docker daemon options
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There are a number of ways to configure the daemon flags and environment variables
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for your Docker daemon.
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If the `docker.service` file is set to use an `EnvironmentFile`
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(often pointing to `/etc/sysconfig/docker`) then you can modify the
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referenced file.
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Or, you may need to edit the `docker.service` file, which can be in `/usr/lib/systemd/system`
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or `/etc/systemd/service`.
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### Runtime directory and storage driver
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You may want to control the disk space used for Docker images, containers
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and volumes by moving it to a separate partition.
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In this example, we'll assume that your `docker.service` file looks something like:
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[Unit]
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Description=Docker Application Container Engine
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Documentation=http://docs.docker.com
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After=network.target docker.socket
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Requires=docker.socket
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[Service]
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Type=notify
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EnvironmentFile=-/etc/sysconfig/docker
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ExecStart=/usr/bin/docker -d -H fd:// $OPTIONS
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LimitNOFILE=1048576
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LimitNPROC=1048576
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[Install]
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Also=docker.socket
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This will allow us to add extra flags to the `/etc/sysconfig/docker` file by
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setting `OPTIONS`:
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OPTIONS="--graph /mnt/docker-data --storage-driver btrfs"
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You can also set other environment variables in this file, for example, the
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`HTTP_PROXY` environment variables described below.
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### HTTP Proxy
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This example overrides the default `docker.service` file.
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If you are behind a HTTP proxy server, for example in corporate settings,
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you will need to add this configuration in the Docker systemd service file.
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First, create a systemd drop-in directory for the docker service:
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mkdir /etc/systemd/system/docker.service.d
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Now create a file called `/etc/systemd/system/docker.service.d/http-proxy.conf`
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that adds the `HTTP_PROXY` environment variable:
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[Service]
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Environment="HTTP_PROXY=http://proxy.example.com:80/"
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If you have internal Docker registries that you need to contact without
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proxying you can specify them via the `NO_PROXY` environment variable:
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Environment="HTTP_PROXY=http://proxy.example.com:80/" "NO_PROXY=localhost,127.0.0.0/8,docker-registry.somecorporation.com"
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Flush changes:
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$ sudo systemctl daemon-reload
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Restart Docker:
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$ sudo systemctl restart docker
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## Manually creating the systemd unit files
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When installing the binary without a package, you may want
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to integrate Docker with systemd. For this, simply install the two unit files
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(service and socket) from [the github
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repository](https://github.com/docker/docker/tree/master/contrib/init/systemd)
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to `/etc/systemd/system`.
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