Fail to run docker hello world

After docker installed, it is recommended to check it with below command:

sudo docker run hello-world

When it fails to run, it might be a missing proxy configuration. Docker has its own proxy configuration and it does not use http_proxy variable.

Define docker proxy:

Edit etc/systemd/system/docker.service.d/http-proxy.conf and add proxy under [Service] section:

[Service]

Environment="http_proxy=http://PROXY_MACHINE_REAL_NAME:8080"
"https_proxy=http://PROXY_MACHINE_REAL_NAME:8080"
"no_proxy=127.0.0.1,localhost,mydyumserver"

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