CentOS6.5通过SSH免密码登陆

来源：互联网发布：安卓锁屏软件编辑：程序博客网时间：2024/06/05 05:17

我们用四台服务器做测试，IP分别为

A:192.168.1.211

B:192.168.1.212

C:192.168.1.213

D:192.168.1.214

四台电脑上同时操作

ssh-keygen -t rsa

连续三次回车，系统会在/root/.ssh/下生成一个公钥和一个私钥

[root@localhost ~]# ssh-keygen -t rsaGenerating public/private rsa key pair.Enter file in which to save the key (/root/.ssh/id_rsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /root/.ssh/id_rsa.Your public key has been saved in /root/.ssh/id_rsa.pub.The key fingerprint is:89:1d:2d:8f:a9:a8:5a:db:d2:eb:77:d1:ba:fd:d5:02 root@localhost.localdomainThe key's randomart image is:+--[ RSA 2048]----+|                 ||         .       ||        o .      ||       o B       ||      . S.. E    ||     . .. .  . . ||  ... .  o    o .|| ..+. . o.   . . ||..oo+o ......    |+-----------------+[root@localhost ~]#

将B、C、D三台电脑的公钥发送给A，并且重命名以免发生覆盖

[root@localhost ~]# scp /root/.ssh/id_rsa.pub 192.168.1.211:/root/.ssh/id_rsa.pub2The authenticity of host '192.168.1.211 (192.168.1.211)' can't be established.RSA key fingerprint is 23:5b:94:96:05:03:23:58:78:bd:d3:d8:fa:39:43:3c.Are you sure you want to continue connecting (yes/no)? yesWarning: Permanently added '192.168.1.211' (RSA) to the list of known hosts.root@192.168.1.211's password: id_rsa.pub                                                                                                                            100%  408     0.4KB/s   00:00    [root@localhost ~]#

[root@localhost ~]# scp /root/.ssh/id_rsa.pub 192.168.1.211:/root/.ssh/id_rsa.pub3The authenticity of host '192.168.1.211 (192.168.1.211)' can't be established.RSA key fingerprint is 23:5b:94:96:05:03:23:58:78:bd:d3:d8:fa:39:43:3c.Are you sure you want to continue connecting (yes/no)? yesWarning: Permanently added '192.168.1.211' (RSA) to the list of known hosts.root@192.168.1.211's password: id_rsa.pub                                                                                                                            100%  408     0.4KB/s   00:00    [root@localhost ~]#

[root@localhost ~]# scp /root/.ssh/id_rsa.pub 192.168.1.211:/root/.ssh/id_rsa.pub4The authenticity of host '192.168.1.211 (192.168.1.211)' can't be established.RSA key fingerprint is 23:5b:94:96:05:03:23:58:78:bd:d3:d8:fa:39:43:3c.Are you sure you want to continue connecting (yes/no)? yesWarning: Permanently added '192.168.1.211' (RSA) to the list of known hosts.root@192.168.1.211's password: id_rsa.pub                                                                                                                            100%  408     0.4KB/s   00:00    [root@localhost ~]#

发送完成之后我们查看A的/root/.ssh/目录

[root@localhost ~]# ll /root/.ssh/total 20-rw------- 1 root root 1675 Oct  9 15:18 id_rsa-rw-r--r-- 1 root root  408 Oct  9 15:18 id_rsa.pub-rw-r--r-- 1 root root  408 Oct  9 15:21 id_rsa.pub2-rw-r--r-- 1 root root  408 Oct  9 15:22 id_rsa.pub3-rw-r--r-- 1 root root  408 Oct  9 15:22 id_rsa.pub4[root@localhost ~]#

可以看到除了自己本身的公钥和私钥还多了三个又B、C、D发送过来的公钥。接下来我们在A电脑上将四个公钥写入到authorized_keys文件

[root@localhost ~]# cat /root/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys[root@localhost ~]# cat /root/.ssh/id_rsa.pub2 >> /root/.ssh/authorized_keys[root@localhost ~]# cat /root/.ssh/id_rsa.pub3 >> /root/.ssh/authorized_keys[root@localhost ~]# cat /root/.ssh/id_rsa.pub4 >> /root/.ssh/authorized_keys[root@localhost ~]#

写入完成查看一下authorized_keys文件里面是否有内容

[root@localhost ~]# cat /root/.ssh/authorized_keys ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA6Y6cL086xfqj1VFnVeNeGxDtakT6yXbPphMUSgVdICKRfQEsZdbuqx3CpZ7AsxzGqtjqusfcE0wkZHTpB9+w2ewwyqzLEesGQke3MU+ppeKeRTVmuVaeZ/+p0ivKECX3C0eFPZmxXg/Tp35UzM09fGuHTVT6PQ+NNml3A7BIXLu9aZ6V0H9VGgbtjdvBGdmpx8COwhSaatZOMRY+zHXJtynpudFYclnqefwTTYB7EsIhkf8lEQZPqLfjyX2XPp3V5gGrvPda/VlkBQRCKaF5zqlg024e1Wf9bYPgSLh+R+XxWQzTlBrG9ayvMkdMHb2DOUNYnnspt9I4jxPazra3aQ== root@localhost.localdomainssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA3h2kkCOzvYcHnSy03DiW7phqQ4SxNnuV7qiKcXgMDi56pL23vrAiPDraeyn6zRgtwwSPS47ZbtQ7hgUEVZ8MNzcu4JIBW/QEPuGFA2rX9n19h9e1TCvVxlC2zRAgQs/8lUBTXO+63Ua/W1GeKOxOLUiLBPLmHOkhFkngVpzaFWrqj/YhgqQ+hemDUmrNkDCs3EBIBoF8QAH0z3mCr0pMVv8HEFFvwS4tSnwJDvh+86/tFUwzO/6uUa4hY/XvF/IhVUiB39zKFLdKxU5K03ZzTHMLxbzeUKLwY0uOLoP+9lzwj08EUjmYkyQgXaT3ZKM9m8RoBMGvcRnos0jl/By2OQ== root@localhost.localdomainssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAvUnnRJ0W9HNY655XMk1nUnSqQHmNNurTUfOGehEJG/lWaqYgbtxzxw2WA4+76rvMJ/Reqi6c5kc/K3sE0Qz8MoCFbItG5ROFjSieS7TyBi/351bVcsIhcC4JmltJx73dt9eQSdVJlN4eVVqSqPs9TK6YpnydA3AGmcZCCpVLESuzj7geXzMO16m+un/4OfQFFlcIcT5m/6zP1C/XiljFwlTD6v/8UFDlm4a7yXOrm+1mF6GjEifOiPGPVILOv6PlCrM21Z0yeh/sTJ36308LjGwuk+4qFzY+X0o+hP7Q1jEJjnETOnCSIttUdMzBwclVonKBAPOxqY1g+UCy6Plfdw== root@localhost.localdomainssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAvO4L3lAycE6sXb+60s5KDtzLAoY6XwxpBKM6rIz2aX/qYOZBVDfqZYIRI7V03xVudfcuaPab8tUEnReXYsn6o9OX5WmBxu94Uu6SaiQmD7PvVNdV8wScsyd4lB6rkxne436A53d7TYH3IugDmdnaI8fXEv60BUQMPcbpwyxaCwzRqISglj2iog8LfV3yGfJed/cGp8RvgcToDNYbK2Q+ZVgZHiiHQcGpxbHmTRtavGtA6nFBs6K+l7XzfwvN7f/yL++6z/DjDMwuoHHIGY2Uhn5YCbDTppU1aRjXTvp/eOWg3x1BYiI2gHqqpOaDVSYZsNgp79Pu1CnyGFQeu2luhQ== root@localhost.localdomain[root@localhost ~]#

接下来我们将生成好的authorized_keys文件放入B、C、D每台电脑

[root@localhost ~]# scp /root/.ssh/authorized_keys 192.168.1.212:/root/.ssh/The authenticity of host '192.168.1.212 (192.168.1.212)' can't be established.RSA key fingerprint is 23:5b:94:96:05:03:23:58:78:bd:d3:d8:fa:39:43:3c.Are you sure you want to continue connecting (yes/no)? yesWarning: Permanently added '192.168.1.212' (RSA) to the list of known hosts.root@192.168.1.212's password: authorized_keys                                                                                                                       100% 1632     1.6KB/s   00:00    [root@localhost ~]# scp /root/.ssh/authorized_keys 192.168.1.213:/root/.ssh/The authenticity of host '192.168.1.213 (192.168.1.213)' can't be established.RSA key fingerprint is 23:5b:94:96:05:03:23:58:78:bd:d3:d8:fa:39:43:3c.Are you sure you want to continue connecting (yes/no)? yesWarning: Permanently added '192.168.1.213' (RSA) to the list of known hosts.root@192.168.1.213's password: authorized_keys                                                                                                                       100% 1632     1.6KB/s   00:00    [root@localhost ~]# scp /root/.ssh/authorized_keys 192.168.1.214:/root/.ssh/The authenticity of host '192.168.1.214 (192.168.1.214)' can't be established.RSA key fingerprint is 23:5b:94:96:05:03:23:58:78:bd:d3:d8:fa:39:43:3c.Are you sure you want to continue connecting (yes/no)? yesWarning: Permanently added '192.168.1.214' (RSA) to the list of known hosts.root@192.168.1.214's password: authorized_keys                                                                                                                       100% 1632     1.6KB/s   00:00    [root@localhost ~]#

好了，到这里我们就完成了四台电脑之间的SSH免密码访问。

[root@localhost ~]# ssh 192.168.1.211Last login: Mon Oct  9 15:08:18 2017 from 192.168.1.40[root@localhost ~]#

通过ssh登陆进去以后可以通过logout命令登陆

[root@localhost ~]# logoutConnection to 192.168.1.211 closed.[root@localhost ~]#

好了，这个就到这里，有什么疑问欢迎大家留言。

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