免密码认证

配置SSH密钥免密码登录需三步：首先在本地运行ssh-keygen -t rsa -b 2048生成密钥对，私钥id_rsa保存于~/.ssh/，公钥id_rsa.pub用于后续配置；然后通过ssh-copy-id user@192.168.1.100将公钥复制到远程服务器的~/.ssh/autho…