从docker1.3.2版本开始默认docker registry使用的是https，当你用docker pull 非https的docker regsitry的时候会报下面错误：
Error: Invalid registry endpoint ... Get ... If this private registry supports only HTTP or HTTPS with an unknown CA certificate, please add '--insecure-registry 192.168.1.103:5000' to the daemon's arguments. In the case of HTTPS, if you have access to the registry's CA certificate, no need for the flag; simply place the CA certificate at /etc/docker/certs.d/192.168.1.103:5000/ca.crt
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解决方案：
vi /usr/lib/systemd/system/docker.service
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内容修改如下：
[Unit]Description=Docker Application Container EngineDocumentation=http://docs.docker.comAfter=network.target docker.socketRequires=docker.socket[Service]Type=notifyEnvironmentFile=-/etc/sysconfig/dockerEnvironmentFile=-/etc/sysconfig/docker-storageExecStart=/usr/bin/docker -d --insecure-registry 192.168.1.103:5000 -H fd:// $OPTIONS $DOCKER_STORAGE_OPTIONSLimitNOFILE=1048576LimitNPROC=1048576[Install]WantedBy=multi-user.target
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