Error message
dial tcp: lookup index.docker.io: no such host
HTTP Proxy
This example overrides the default docker.service file.
If you are behind a HTTP proxy server, for example in corporate settings, you will need to add this configuration in the Docker systemd service file.
First, create a systemd drop-in directory for the docker service:
mkdir /etc/systemd/system/docker.service.d
Now create a file called /etc/systemd/system/docker.service.d/http-proxy.conf that adds the HTTP_PROXY environment variable:
[Service]
Environment="HTTP_PROXY=http://proxy.example.com:80/"
If you have internal Docker registries that you need to contact without proxying you can specify them via the NO_PROXY environment variable:
Environment="HTTP_PROXY=http://proxy.example.com:80/" "NO_PROXY=localhost,127.0.0.0/8,docker-registry.somecorporation.com"
Flush changes:
$ sudo systemctl daemon-reload
Restart Docker:
$ sudo systemctl restart docker
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