HTTP proxy configuration for Docker on CentOS 7

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HTTP proxy configuration for Docker on CentOS 7

On CentOS7 if docker is behind a proxy server then use following steps:

1. Create folder for configuring docker service through systemd

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

2. Create service configuration file at /etc/systemd/system/docker.service.d/http-proxy.conf

   [Service]
   Environment="HTTP_PROXY=http://proxy.iiit.ac.in:8080/" "NO_PROXY=localhost,127.0.0.0/8,10.0.0.0/8,192.168.0.0/16,172.16.0.0/12"

3. Reload systemctl so that new settings are read

   sudo systemctl daemon-reload

4. Verify that docker service Environment is properly set

   sudo systemctl show docker --property Environment

5. Restart docker service so that it uses updated Environment settings

   sudo systemctl restart docker

Learned from https://docs.docker.com/articles/systemd/

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