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通过第一台虚拟化主机，将适用于 root 用户的基于公钥身份验证的 SSH 配置到所有 3 台虚拟化主机上。
确保您使用的是与后端管理网络关联的主机名或 IP 地址。
有关更多详细信息，请查看 Red Hat Enterprise Linux 7 的《安装指南》：https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/System_Administrators_Guide/s1-ssh-configuration.html#s2-ssh-configuration-keypairs。
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