Docker国内镜像源

1. 问题

镜像依赖于http://docker.io/almalinux，最近构建时网络有些问题

 failed to do request: Head "https://registry-1.docker.io/

2. 替换国内镜像源

系统为CentOS 7，修改/etc/docker/daemon.json

{"registry-mirrors":["http://hub-mirror.c.163.com"]}

重启docker

systemctl daemon-reload
systemctl restart docker