Daemon proxy configuration
If your organization uses a proxy server to connect to the internet, you may need to configure the Docker daemon to use the proxy server. The daemon uses a proxy server to access images stored on Docker Hub and other registries, and to reach other nodes in a Docker swarm.
This page describes how to configure a proxy for the Docker daemon. For instructions on configuring proxy settings for the Docker CLI, see Configure Docker CLI to use a proxy server.
There are two ways you can configure these settings:
- Configuring the daemon through a configuration file or CLI flags
- Setting environment variables on the system
Configuring the daemon directly takes precedence over environment variables.
Daemon configuration
You may configure proxy behavior for the daemon in the daemon.json
file,
or using CLI flags for the --http-proxy
or --https-proxy
flags for the
dockerd
command. Configuration using daemon.json
is recommended.
{
"proxies": {
"http-proxy": "http://proxy.example.com:3128",
"https-proxy": "https://proxy.example.com:3129",
"no-proxy": "*.test.example.com,.example.org,127.0.0.0/8"
}
}
After changing the configuration file, restart the daemon for the proxy configuration to take effect:
$ sudo systemctl restart docker
Environment variables
The Docker daemon checks the following environment variables in its start-up environment to configure HTTP or HTTPS proxy behavior:
HTTP_PROXY
http_proxy
HTTPS_PROXY
https_proxy
NO_PROXY
no_proxy
systemd unit file
If you're running the Docker daemon as a systemd service, you can create a
systemd drop-in file that sets the variables for the docker
service.
Note for rootless mode
The location of systemd configuration files are different when running Docker in rootless mode. When running in rootless mode, Docker is started as a user-mode systemd service, and uses files stored in each users' home directory in
~/.config/systemd/<user>/docker.service.d/
. In addition,systemctl
must be executed withoutsudo
and with the--user
flag. Select the "Rootless mode" tab if you are running Docker in rootless mode.
Create a systemd drop-in directory for the
docker
service:$ sudo mkdir -p /etc/systemd/system/docker.service.d
Create a file named
/etc/systemd/system/docker.service.d/http-proxy.conf
that adds theHTTP_PROXY
environment variable:[Service] Environment="HTTP_PROXY=http://proxy.example.com:3128"
If you are behind an HTTPS proxy server, set the
HTTPS_PROXY
environment variable:[Service] Environment="HTTPS_PROXY=https://proxy.example.com:3129"
Multiple environment variables can be set; to set both a non-HTTPS and a HTTPs proxy;
[Service] Environment="HTTP_PROXY=http://proxy.example.com:3128" Environment="HTTPS_PROXY=https://proxy.example.com:3129"
Note
Special characters in the proxy value, such as
#?!()[]{}
, must be double escaped using%%
. For example:[Service] Environment="HTTP_PROXY=http://domain%%5Cuser:complex%%23pass@proxy.example.com:3128/"
If you have internal Docker registries that you need to contact without proxying, you can specify them via the
NO_PROXY
environment variable.The
NO_PROXY
variable specifies a string that contains comma-separated values for hosts that should be excluded from proxying. These are the options you can specify to exclude hosts:- IP address prefix (
1.2.3.4
) - Domain name, or a special DNS label (
*
) - A domain name matches that name and all subdomains. A domain name with a
leading "." matches subdomains only. For example, given the domains
foo.example.com
andexample.com
:example.com
matchesexample.com
andfoo.example.com
, and.example.com
matches onlyfoo.example.com
- A single asterisk (
*
) indicates that no proxying should be done - Literal port numbers are accepted by IP address prefixes (
1.2.3.4:80
) and domain names (foo.example.com:80
)
Example:
[Service] Environment="HTTP_PROXY=http://proxy.example.com:3128" Environment="HTTPS_PROXY=https://proxy.example.com:3129" Environment="NO_PROXY=localhost,127.0.0.1,docker-registry.example.com,.corp"
- IP address prefix (
Flush changes and restart Docker
$ sudo systemctl daemon-reload $ sudo systemctl restart docker
Verify that the configuration has been loaded and matches the changes you made, for example:
$ sudo systemctl show --property=Environment docker Environment=HTTP_PROXY=http://proxy.example.com:3128 HTTPS_PROXY=https://proxy.example.com:3129 NO_PROXY=localhost,127.0.0.1,docker-registry.example.com,.corp
Create a systemd drop-in directory for the
docker
service:$ mkdir -p ~/.config/systemd/user/docker.service.d
Create a file named
~/.config/systemd/user/docker.service.d/http-proxy.conf
that adds theHTTP_PROXY
environment variable:[Service] Environment="HTTP_PROXY=http://proxy.example.com:3128"
If you are behind an HTTPS proxy server, set the
HTTPS_PROXY
environment variable:[Service] Environment="HTTPS_PROXY=https://proxy.example.com:3129"
Multiple environment variables can be set; to set both a non-HTTPS and a HTTPs proxy;
[Service] Environment="HTTP_PROXY=http://proxy.example.com:3128" Environment="HTTPS_PROXY=https://proxy.example.com:3129"
Note
Special characters in the proxy value, such as
#?!()[]{}
, must be double escaped using%%
. For example:[Service] Environment="HTTP_PROXY=http://domain%%5Cuser:complex%%23pass@proxy.example.com:3128/"
If you have internal Docker registries that you need to contact without proxying, you can specify them via the
NO_PROXY
environment variable.The
NO_PROXY
variable specifies a string that contains comma-separated values for hosts that should be excluded from proxying. These are the options you can specify to exclude hosts:- IP address prefix (
1.2.3.4
) - Domain name, or a special DNS label (
*
) - A domain name matches that name and all subdomains. A domain name with a
leading "." matches subdomains only. For example, given the domains
foo.example.com
andexample.com
:example.com
matchesexample.com
andfoo.example.com
, and.example.com
matches onlyfoo.example.com
- A single asterisk (
*
) indicates that no proxying should be done - Literal port numbers are accepted by IP address prefixes (
1.2.3.4:80
) and domain names (foo.example.com:80
)
Example:
[Service] Environment="HTTP_PROXY=http://proxy.example.com:3128" Environment="HTTPS_PROXY=https://proxy.example.com:3129" Environment="NO_PROXY=localhost,127.0.0.1,docker-registry.example.com,.corp"
- IP address prefix (
Flush changes and restart Docker
$ systemctl --user daemon-reload $ systemctl --user restart docker
Verify that the configuration has been loaded and matches the changes you made, for example:
$ systemctl --user show --property=Environment docker Environment=HTTP_PROXY=http://proxy.example.com:3128 HTTPS_PROXY=https://proxy.example.com:3129 NO_PROXY=localhost,127.0.0.1,docker-registry.example.com,.corp