1. docker下载经常遇见如下问题

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)

2. daemon.json修改

cd /etc/docker

如果该目录下没用 daemon.json，就新建一个 daemon.json，然后输入以下内容

{
    "registry-mirrors": [
          "https://2a6bf1988cb6428c877f723ec7530dbc.mirror.swr.myhuaweicloud.com",
          "https://docker.m.daocloud.io",
          "https://hub-mirror.c.163.com",
          "https://mirror.baidubce.com",
          "https://your_preferred_mirror",
          "https://dockerhub.icu",
          "https://docker.registry.cyou",
          "https://docker-cf.registry.cyou",
          "https://dockercf.jsdelivr.fyi",
          "https://docker.jsdelivr.fyi",
          "https://dockertest.jsdelivr.fyi",
          "https://mirror.aliyuncs.com",
          "https://dockerproxy.com",
          "https://mirror.baidubce.com",
          "https://docker.m.daocloud.io",
          "https://docker.nju.edu.cn",
          "https://docker.mirrors.sjtug.sjtu.edu.cn",
          "https://docker.mirrors.ustc.edu.cn",
          "https://mirror.iscas.ac.cn",
          "https://docker.rainbond.cc"
     ]
}

3. 刷新和启动

systemctl daemon-reload
systemctl restart docker