安裝docket下載超時，需要將docker 網址換成國內的網址
[root@localhost yum.repos.d]# dnf install https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm Last metadata expiration check: 0:01:12 ago on Wed 29 Apr 2020 02:41:32 PM CST. [MIRROR] containerd.io-1.2.6-3.3.el7.x86_64.rpm: Curl error (28): Timeout was reached for https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm [Operation too slow. Less than 1000 bytes/sec transferred the last 30 seconds] [FAILED] containerd.io-1.2.6-3.3.el7.x86_64.rpm: Curl error (28): Timeout was reached for https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm [Operation too slow. Less than 1000 bytes/sec transferred the last 30 seconds] Curl error (28): Timeout was reached for https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm [Operation too slow. Less than 1000 bytes/sec transferred the last 30 seconds] [root@localhost yum.repos.d]# dnf install https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm Last metadata expiration check: 0:02:47 ago on Wed 29 Apr 2020 02:41:32 PM CST.
解決方法：換成國內的源
[root@localhost yum.repos.d]# dnf install https://mirrors.aliyun.com/docker-ce/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm
問題2：
在centos8.1 安裝docker 執行安裝時報如下錯誤
解決方法：
手動安裝containerd.io
[root@localhost yum.repos.d]# dnf install https://mirrors.aliyun.com/docker-ce/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm
問題3：
通過yum 安裝完成docker執行搜索鏡像的為命令，報Cannot connect to the Docker daemon錯誤
[root@localhost yum.repos.d]# docker search centos Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
解決方法：重新加載daemon文件並重啟docker
[root@localhost yum.repos.d]# systemctl daemon-reload [root@localhost yum.repos.d]# systemctl restart docker [root@localhost yum.repos.d]# systemctl status docker