systemctl restart docker在docker-hub拉取慢，因为服务器在外网

直接配置阿里云镜像就可以

首先：

  1. vim /etc/docker/daemon.json
    加入下面的那句
  2.  

"registry-mirrors": ["https://o88ff1dn.mirror.aliyuncs.com"]

然后

systemctl daemon-reload

systemctl restart docker

就ok，注意，etc/docker/daemon.json里本来就有俩括号，直接在阔括号里面加我标红的那句就可以了，千万千万别加俩大括号，切记！！！（我一直加，弄了俩小时，一直拉不了，一不加，瞬间拉下来了，坑啊！！！！！）

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