Setting up Docker proxy under CentOS 7 (environment variable configuration of Systemd service under Linux)

The Docker daemon uses HTTP_PROXY , HTTPS_PROXY , and NO_PROXY environment variables to configure the behavior of the HTTP or HTTPS proxy in its startup environment. These environment variables cannot be configured using the daemon.json file.

This example overrides the default docker.service file.

In the setup, you need to add this configuration in the Docker systemd service file

If you use an HTTP proxy server, a systemd plugin directory will be created for the docker service:

mkdir -p /etc/systemd/system/docker.service.d

Create a file called /etc/systemd/system/docker.service.d/http-proxy.conf and add HTTP_PROXY environment variable:

[Service]
Environment="HTTP_PROXY=http://proxy.example.com:80/"

Alternatively, if you use an HTTPS proxy server, create another file called /etc/systemd/system/docker.service.d/https-proxy.conf and add HTTPS_PROXY environment variable:

[Service]
Environment="HTTPS_PROXY=https://proxy.example.com:443/"

When configuring non-proxy addresses for Docker, you can specify them through the NO_PROXY environment variable, such as the configuration of an HTTP proxy server:

[Service]    
Environment="HTTP_PROXY=http://proxy.example.com:80/" "NO_PROXY=localhost,127.0.0.1,docker-registry.somecorporation.com"

Or, HTTPS proxy server configuration:

[Service]    
Environment="HTTPS_PROXY=https://proxy.example.com:443/" "NO_PROXY=localhost,127.0.0.1,docker-registry.somecorporation.com"

Re-read the service configuration file:

systemctl daemon-reload

Restart Docker:

systemctl restart docker

Verify that the configuration was loaded:

systemctl show --property=Environment docker

refer to:

https://docs.docker.com/config/daemon/systemd/

The above is the details of setting up Docker proxy under CentOS 7 (environment variable configuration of Systemd service under Linux). For more information about Docker configuration of systemd service, please pay attention to other related articles on 123WORDPRESS.COM!