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密钥+密码登录ssh（双层保障）
1. 生成密钥
使用需要生成密钥的用户登录后键入。
ssh-keygen -t rsa
直接回车会在~/.ssh目录（用户所在家目录下的.ssh目录，如果没有请自行创建.ssh目录）生成id_rsa, id_rsa.pub文件 第一个是私有密钥
第二个是公共密钥。如果输入内容会在当前目录创建你输入内容为名称的私钥公钥。这里直接回车。
然后输入密钥密码，再次输入密码（也可以不要密码直接回车）。生成密钥完成。
将用户.ssh目录内的两个密钥下载到本地。（我用的是win客户端ftp方式下载）
2. 配置ssh使用密钥（一定先下载下来再去修改配置）
将.ssh中的id_rsa.pub复制并改名字为authorized_keys
将生成的私钥文件下载到本地保存id_rsa，可以保存成node1
cd .ssh cp id_rsa.pub authorized_keys
修改authorized_keys权限为700（必须修改为700，不能为其他）
chmod 700 authorized_keys vim /etc/ssh/sshd_config 修改sshd_config文件
AuthorizedKeysFile .ssh/authorized_keys //公钥公钥认证文件 PubkeyAuthentication yes
//可以使用公钥登录 PasswordAuthentication no //不允许使用密码登录 systemctl restart sshd.service
在XShell中登录
* 文件-> 新建
名称没有太大限制。随意填写，这里填写的是rsa-test。
接着填写主机的IP地址，也就是所要连接的服务器的IP地址。
* 填写 用户身份验证 信息
这里的密码为前面所设置的秘钥的保密码，用户名为服务器的账号用户名。
在多终端的XShell上进行登录
如果在另外一台电脑上连接这个服务器账号，则除了前面一步的配置之外，还需要手动添加私钥。具体方法为：
*
工具-> 用户秘钥管理者
*
选择 导入，然后选择私钥之后选择打开即可正常连接。
