Deploy a plain HTTP registry

当docker pull a.b.com/ubuntu:14.04的时候，如果提示：“Docker x509 insecure registry”之类的，说这个registry不安全的，如果就是想在a.b.com上面pull，可以这样：

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mac版直接这样：

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linux版的docker，需要这样：

1. Edit the daemon.json file, whose default location is /etc/docker/daemon.json on Linux , If the daemon.json file does not exist, create it. Assuming there are no other settings in the file, it should have the following contents:

{
  "insecure-registries" : ["myregistrydomain.com:5000"]
}

2. Restart Docker for the changes to take effect:
   sudo service docker restart