异常信息：

Error response from daemon: Head https://registry-1.docker.io/v2/library/redis/manifests/latest: Get https://auth.docker.io/token?scope=repository%3Alibrary%2Fredis%3Apull&service=registry.docker.io: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)

解决该问题主要有两种

一 

解析ip不可用，可以使用 dig @114.114.114.114 registry-1.docker.io找到 如下信息

;; ANSWER SECTION:
registry-1.docker.io.   40      IN      A       3.209.182.229
 

将ANSWER SECTION中的信息填入 、etc/hosts文件中

二 

dns解析错误
在/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:

三 

{
   "exec-opts": ["native.cgroupdriver=systemd"],
   "registry-mirrors": [
    "https://ogsm8vnr.mirror.aliyuncs.com",
    "https://docker.registry.cyou",
    "https://docker-cf.registry.cyou",
    "https://dockercf.jsdelivr.fyi",
    "https://docker.jsdelivr.fyi",
    "https://dockertest.jsdelivr.fyi",
    "https://mirror.aliyuncs.com",
    "https://dockerproxy.com",
    "https://mirror.baidubce.com",
    "https://docker.m.daocloud.io",
    "https://docker.nju.edu.cn",
    "https://docker.mirrors.sjtug.sjtu.edu.cn",
    "https://docker.mirrors.ustc.edu.cn",
    "https://mirror.iscas.ac.cn",
    "https://docker.rainbond.cc"
  ]
}