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When Docker needs to pull the target image through a proxy server, you can configure a global proxy for Docker to achieve this.

Note: The proxy set by the temporary command export HTTP_PROXY on Linux is useful for curl, but not for docker pull.

Example

Assume your proxy server address is proxy.example.com, the port is 8080, here are the specific steps:

1. Create or edit a configuration file

mkdir -p /etc/systemd/system/docker.service.d
touch /etc/systemd/system/docker.service.d/http-proxy.conf

2. Add content to the file

Environment="HTTP_PROXY=http://proxy.example.com:8080"
Environment="HTTPS_PROXY=http://proxy.example.com:8080"

3. Reload and restart the Docker service

systemctl daemon-reload
systemctl restart docker

4. Verify the configuration

docker info

You should see proxy configuration information similar to the following in the output:

HTTP Proxy: http://proxy.example.com:8080
HTTPS Proxy: http://proxy.example.com:8080

With these steps, you should be able to correctly configure the Docker daemon to use a proxy server for image pulling.

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