docker配置国内镜像地址，解决无法pull镜像问题docker: Error response from daemon

问题：

执行命令

$ docker run -it --rm -p 8888:8080 tomcat:8.5.32
报错

Unable to find image 'tomcat:8.5.32' locally
docker: Error response from daemon: Get https://registry-1.docker.io/v2/: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers).
See 'docker run --help'.

$ echo "DOCKER_OPTS="$DOCKER_OPTS --registry-mirror=http://f2d6cb40.m.daocloud.io"" | sudo tee -a /etc/default/docker
$ sudo service docker restart
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原文链接：https://blog.csdn.net/belvine/java/article/details/89478228