Docker pull kube-apiserver 会有以下报错：
[root#59]/home: docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.23.4
Error response from daemon: Head "https://registry.cn-hangzhou.aliyuncs.com/v2/google_containers/kube-apiserver/manifests/v1.23.4": Get "https://dockerauth.cn-hangzhou.aliyuncs.com/auth?scope=repository%3Agoogle_containers%2Fkube-apiserver%3Apull&service=registry.aliyuncs.com%3Acn-hangzhou%3A26842": dial tcp [2408:4005:1000:10::1]:443: connect: network is unreachable
解决方法：
sudo vi /etc/resolv.conf
添加谷歌的dns域名解析地址:
nameserver 8.8.4.4
nameserver localdomain
保存后重启下docker命令:
Systemctl restart docker
