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整理一下所有遇到这个问题的解决办法，最终已解决！！！！

1、先确定虚拟机能够连接公网，网络适配器选择NAT

[root@localhost etc]# ping www.baidu.comPING www.wshifen.com (103.235.46.39) 56(84) bytes of data.64 bytes from 103.235.46.39 (103.235.46.39): icmp_seq=2 ttl=128 time=117 ms64 bytes from 103.235.46.39 (103.235.46.39): icmp_seq=3 ttl=128 time=80.9 ms64 bytes from 103.235.46.39 (103.235.46.39): icmp_seq=4 ttl=128 time=105 ms64 bytes from 103.235.46.39 (103.235.46.39): icmp_seq=6 ttl=128 time=116 ms

2、如果在拉取镜像时出现如下图报错，考虑先docker login

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)

3、如果docker login 报错如下

[root@localhost etc]# docker loginLogin with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one.Username: kaerdockerPassword: 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)

 4、多数是国外镜像源的网络限制导致，使用国内镜像源即可，但是网络上一大堆没用的，直接上命令

#####https://registry.docker-cn.com是可用的##########

[root@localhost etc]# vim /etc/docker/daemon.json

#####

[root@localhost etc]# systemctl daemon-reload 

[root@localhost etc]# systemctl restart docker

[root@localhost etc]# docker login

如果报错Error response from daemon: Get https://registry-1.docker.io/v2/: net/http: TLS handshake timeout试着重新寻找镜像源吧

[root@localhost etc]# docker run hello-world

如果以上还不能解决，下面总结下网络搜索下出现的解决方案（本人未使用到）

##########摘抄该链接

mkdir -p /etc/systemd/system/docker.service.d

[Service]

systemctl daemon-reload

###########变更DNS###########

[root@localhost etc]# vim /etc/resolv.conf

# Generated by NetworkManager

nameserver 8.8.8.8

结束，继续docker之旅。

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