docker从私有镜像库pull/push镜像问题：Error response from daemon: Get https://harbor.op.xxxx.com/v2/: x509: certificate signed by unknown authority

docker从私有镜像库pull/push镜像问题：Error response from daemon: Get https://harbor.op.xxxx.com/v2/: x509: certificate signed by unknown authority

环境centos7+docker 1.17

解决方法：
1. 添加https证书，方法自己搜下
2. 加--insecure-registry参数

配置文件位置
/usr/lib/systemd/system/docker.service
ExecStart=/usr/bin/dockerd --insecure-registry harbor.op.xxxx.com

之前也搜到过ExecStart=/usr/bin/docker daemon -H fd:// --insecure-registry=xxx 这样的写法， docker无法启动，
报错: `docker daemon` is not supported on Linux. Please run `dockerd` directl

加上参数如果启动失败，可以看下日志 See "systemctl status docker.service" and "journalctl -xe" for details.

centos6也是 如此， centos6 + docker 1.7

配置文件位置

/etc/sysconfig/docker
参数加到
other_args