CentOS7安装Docker和Kubadm

1、卸载旧版本的Docker # 若是系统没有装过docker可跳过此步骤 [root@localhost luna]$ yum remove docker docker-common container-selinux docker-selinux docker-engine -y 2、安装yum-utils [root@localhost luna]$ yum install -y yum-u

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