hello-world 例子
就像其他任何一门语言一样，我们来体验 docker 的 hello world
$ docker run hello-world
但是报错
:~$ docker run hello-world
Unable to find image 'hello-world:latest' locally
docker: Error response from daemon: Get "https://registry-1.docker.io/v2/": dial tcp 208.101.60.87:443: i/o timeout.
See 'docker run --help'.
原因
网络问题，发现 WSL 中网络不通
$ curl -v https://registry-1.docker.io/v2/
* Trying 199.59.149.202:443...
* Trying 2001::9df0:232:443...
* Immediate connect fail for 2001::9df0:232: Network is unreachable
* connect to 199.59.149.202 port 443 failed: Connection timed out
* Failed to connect to registry-1.docker.io port 443 after 133350 ms: Connection timed out
* Closing connection 0
curl: (28) Failed to connect to registry-1.docker.io port 443 after 133350 ms: Connection timed out
解决办法
这和之前的 Docker 报错一致，问题根源在网络连通性，而不是链接本身。
1. 使用国内镜像加速（最快解决）
在 WSL 中执行：
sudo tee /etc/docker/daemon.json <<'EOF'
{"registry-mirrors": ["https://docker.mirrors.ustc.edu.cn","https://registry.docker-cn.com"]
}
EOF
然后重启 Docker：
sudo systemctl restart docker # 若你启用了 systemd
# 或
sudo service docker restart # 若未启用 systemd
再试：
docker run hello-world
发现还是不行，依然报错
$ docker run hello-world
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'.
不过在 WSL 中 ping 一下百度，网络正常
$ ping baidu.com
PING baidu.com (182.61.244.181) 56(84) bytes of data.
64 bytes from 182.61.244.181 (182.61.244.181): icmp_seq=1 ttl=51 time=12.0 ms
64 bytes from 182.61.244.181 (182.61.244.181): icmp_seq=2 ttl=51 time=54.8 ms
64 bytes from 182.61.244.181 (182.61.244.181): icmp_seq=3 ttl=51 time=35.9 ms
64 bytes from 182.61.244.181 (182.61.244.181): icmp_seq=4 ttl=51 time=90.4 ms
确认配置+添加DNS解析
确认配置
$ cat /etc/docker/daemon.json
{"registry-mirrors": ["https://docker.mirrors.ustc.edu.cn","https://registry.docker-cn.com"]
}
dns
$ cat /etc/resolv.conf
# This file was automatically generated by WSL. To stop automatic generation of this file, add the following entry to /etc/wsl.conf:
# [network]
# generateResolvConf = false
# nameserver 172.23.224.1
nameserver 114.114.114.114
可用 ip
dig @114.114.114.114 registry-1.docker.io 找到可用IP
结果很少，感觉很奇怪。
$ dig @114.114.114.114 registry-1.docker.io +short
168.143.162.58
修改 host 文件
echo "168.143.162.58 registry-1.docker.io" | sudo tee -a /etc/hosts
重启
$ sudo systemctl restart docker
确认
docker run hello-world
发现还是不行，真的麻烦。
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