一、docker pull拉取镜像时出错提示拉取镜像超时

1. 修改镜像仓库地址

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sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{
  "registry-mirrors": ["https://yxzrazem.mirror.aliyuncs.com"]
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker

2. 修改DNS

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sudo vim /etc/resolv.conf

//输入
nameserver 8.8.8.8
nameserver 8.8.4.4