报错 Error response from daemon: Get \"https://registry-1.docker.io/v2/\": dial tcp

报错信息：Error response from daemon: Get "https://registry-1.docker.io/v2/": dial tcp

解决方案

1、有可能不能上网

cat /etc/resolv.conf

ping下百度，看能不能正常上网

ping baidu.com

是否存在DNS：nameserver 114.114.114.114

sudo vim /etc/netplan/00-installer-config.yaml

修改后如下

DNS服务器地址，多个DNS服务器地址需要用英文逗号分隔开，可不配置
nameservers:
addresses: [127.0.0.53,114.114.114.114]

# This is the network config written by 'subiquity'
network:
  ethernets:
    enp0s5:
      dhcp4: true
      nameservers:
        addresses:  [127.0.0.53,114.114.114.114]
  version: 2

查看systemd-networkd服务状态（可选）

sudo systemctl status systemd-networkd

重启网络服务

sudo netplan apply

重新拉取正常

2、修改 docker 配置文件

新增或修改 /etc/docker/daemon.json

修改dns内容，"dns": ["114.114.114.114"]

{
    "registry-mirrors":[
        "https://ooe7wn09.mirror.aliyuncs.com",
        "https://registry.docker-cn.com",
        "http://hub-mirror.c.163.com",
        "https://docker.mirrors.ustc.edu.cn"
    ],
    "insecure-registries":[],
    "dns": ["114.114.114.114", "8.8.8.8"]
}

重新拉取正常