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问题：运行 docker run hello-world 报错

Unable to find image 'hello-world:latest' 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'.

原因：原镜像源网络不稳定

做加速配置

vi /etc/docker/daemon.json

{
    "registry-mirrors": [
        "https://do.nark.eu.org",
        "https://dc.j8.work",
        "https://docker.m.daocloud.io",
        "https://dockerproxy.com",
        "https://docker.mirrors.ustc.edu.cn",
        "https://docker.nju.edu.cn"
    ]
}

systemctl restart docker.service