镜像源信息
打开 /etc/docker/daemon.json 没有这个文件就创建
内容如下

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{
	"registry-mirrors": [
	"https://dockerhub.azk8s.cn",
	"https://reg-mirror.qiniu.com",
	"https://registry.docker-cn.com",
	"http://docker.mirrors.ustc.edu.cn",
	"http://hub-mirror.c.163.com"
	]
}

然后重启 docker

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systemctl daemon-reload
systemctl restart docker

resart docker 镜像源不生效的话，先停止在启动

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systemctl stop docker
systemctl start docker