写在前面，这个是我很早之前在VmWare安装的Linux7,通过yum 安装的docker，但是今天怎么都无法pull镜像，报错如下。

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

问题排查

检查网络是否通常

ping www.baidu.com

设置阿里云镜像加速地址

sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{"registry-mirrors": ["https://95lnapms.mirror.aliyuncs.com"]
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker

pull 镜像仍然报错，查看docker是否成功设置镜像地址

docker info | grep Registry -A3 

查看docker 日志看报错问题

# 通过yum 安装的docker日志在 /var/log/messages
tail -500f /var/log/messages
# 直接查看报错信息
Oct  9 21:53:38 localhost dockerd: time="2024-10-09T21:53:38.438867024-04:00" level=info msg="Attempting next endpoint for pull after error: denied: This request is forbidden. Please proceed to https://help.aliyun.com/zh/acr/product-overview/product-change-acr-mirror-accelerator-function-adjustment-announcement to view the announcement." spanID=51a7bcba48f43406 traceID=92a5ccfd35082cb24dd48789f28e858a
Oct  9 21:53:53 localhost dockerd: time="2024-10-09T21:53:53.439850479-04:00" level=warning msg="Error getting v2 registry: Get \"https://registry-1.docker.io/v2/\": net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)" spanID=51a7bcba48f43406 traceID=92a5ccfd35082cb24dd48789f28e858a
# 大概意思就是尝试从阿里云镜像仓库拉取了，但是报错了，然后在从docker原来的镜像仓库拉去，可能网络不通也拉取不到

替换新的镜像仓库地址

sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{"registry-mirrors": ["https://do.nark.eu.org","https://dc.j8.work","https://docker.m.daocloud.io","https://dockerproxy.com","https://docker.mirrors.ustc.edu.cn","https://docker.nju.edu.cn"]
}
EOF
sudo systemctl daemon-reload