Docker Behind Proxy

Configuring docker proxy needs understanding of systemd, this page in digitalocean is a very nice one to start from. In docker official docs, the different situations of envolving docker daemon and/or docker containers are not well separated. Here we make that straight.

Proxy for docker daemon

The command that involves docker daemon itself is the docker pull. This works with Docker version 18.09.6 in Ubuntu18.04, which uses systemd to manage docker daemon:

• Create a systemd drop-in directory for the Docker service, which take precedence before the /lib/systemd/system/docker.service

  mkdir /etc/systemd/system/docker.service.d
  tee /etc/systemd/system/docker.service.d/proxy.conf << EOF
  [Service]
  Environment="HTTP_PROXY=http://10.77.77.77:8080"
  Environment="HTTPS_PROXY=http://10.77.77.77:8080"
  Environment="NO_PROXY=localhost,127.0.0.1,192.168.*.*,172.16.*.*,172.31.*.*,10.*.*.*"
  EOF
  systemctl daemon-reload
  systemctl restart docker
  

• Veryfiy it by running docker info | grep -i proxy

Proxy for running docker containers

• Make docker containers uses proxy, this is for docker build, docker run etc.

  mkdir ~/.docker/
  sudo tee ~/.docker/config.json << EOF
  {
    "proxies":
    {
      "default":
      {
        "httpProxy": "http://10.77.77.77:8080",
        "httpsProxy": "http://10.77.77.77:8080",
        "noProxy": "localhost,127.0.0.1,192.168.*.*,172.16.*.*,172.31.*.*,10.*.*.*"
      }
    }
  }
  EOF
  sudo systemctl restart docker