docker pull拉取失败: error pulling image configuration: download failed after attempts=6:xxx timeout_docker pull download failed

解决方法：
配置镜像源。(属于是把能加的都加上了，此处没有阿里镜像源)

sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<EOF
{
    "registry-mirrors": [
        "https://hub.uuuadc.top",
        "https://docker.anyhub.us.kg",
        "https://dockerhub.jobcher.com",
        "https://dockerhub.icu",
        "https://docker.ckyl.me",
        "https://docker.awsl9527.cn",
        "https://dockerproxy.com",
        "https://docker.mirrors.ustc.edu.cn",
        "https://docker.nju.edu.cn"
    ]
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker
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要添加阿里源请参考：
Docker配置国内镜像源(阿里源)

如果还是不能解决，请参考：
Docker Hub 镜像加速器