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