使用 ssh-keygen 和 ssh-copy-id 实现SSH无密码登录功能

Posted 2020-09-12

首先安装如下软件

yum -y install openssh-clients

否则没有 ssh-copy-id 命令

ssh-keygen  产生公钥与私钥对.

ssh-copy-id 将本机的公钥复制到远程机器的authorized_keys文件中，ssh-copy-id也能让你有到远程机器的home, ~./ssh , 和 ~/.ssh/authorized_keys的权利

该测试以root用户测试，如需其他用户的无密码SSH登录，执行切换到相应用户模式操作即可。

验证测试环境：

192.168.1.41 pgxlsrv1

192.168.1.42 pgxlsrv2

192.168.1.43 pgxlsrv3

第一步:在本地机器上使用ssh-keygen产生公钥私钥对

[root @pgxlsrv1 ~]# ssh-keygen

[root @pgxlsrv2 ~]# ssh-keygen

[root @pgxlsrv3 ~]# ssh-keygen

第二步:用ssh-copy-id将公钥复制到远程机器中

-i：指定公钥文件

#pgxlsrv1

[root @pgxlsrv1 ~]# ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected]

[root @pgxlsrv1 ~]# ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected]

[root @pgxlsrv1 ~]# ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected]

#pgxlsrv2

[root @pgxlsrv2 ~]# ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected]

[root @pgxlsrv2 ~]# ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected]

[root @pgxlsrv2 ~]# ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected]

#pgxlsrv3

[root @pgxlsrv3 ~]# ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected]

[root @pgxlsrv3 ~]# ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected]

[root @pgxlsrv3 ~]# ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected]

注意: ssh-copy-id 将key写到远程机器的 ~/ .ssh/authorized_key.文件中

第三步: 登录到远程机器不用输入密码

#pgxlsrv1

[root @pgxlsrv1 ~]# ssh pgxlsrv1

[root @pgxlsrv1 ~]# ssh pgxlsrv2

[root @pgxlsrv1 ~]# ssh pgxlsrv3

#pgxlsrv2

[root @pgxlsrv2 ~]# ssh pgxlsrv2

[root @pgxlsrv2 ~]# ssh pgxlsrv1

[root @pgxlsrv2 ~]# ssh pgxlsrv3

#pgxlsrv3

[root @pgxlsrv3 ~]# ssh pgxlsrv3

[root @pgxlsrv3 ~]# ssh pgxlsrv1

[root @pgxlsrv3 ~]# ssh pgxlsrv2

------- 通过如上三步即可实现主机之间的无密码SSH登录 --------------

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