【問題】
安裝docker出現的問題
GPG key retrieval failed: [Errno 12] Timeout on https://download.docker.com/linux/centos/gpg: (28, 'Operation timed out after 30001 milliseconds with 0 out of 0 bytes received')
【原因】
由於國內訪問不到docker官方鏡像的緣故
【解決】
執行命令
sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
執行后結果：
其本質是修改了docker-ce.repo文件，文件路徑：/etc/yum.repos.d/docker-ce.repo
GPG key retrieval failed: [Errno 12] Timeout on https://download.docker.com/linux/centos/gpg: (28, 'Operation timed out after 30001 milliseconds with 0 out of 0 bytes received')
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