Linux SSH - ssh免密码登录配置方法 - 《Linux 系统笔记》

首先，说明一下我们要做的是，serverA 服务器的 usera 用户免密码登录 serverB 服务器的 userb用户。
我们先使用usera 登录 serverA 服务器

[root@serverA ~]# su - usera
[usera@serverA ~]$ pwd
/home/usera

然后在serverA上生成密钥对

1. [usera@serverA ~]$ ssh-keygen -t rsa
2. Generating public/private rsa key pair.
3. Enter file in which to save the key (/home/usera/.ssh/id_rsa): 
4. Created directory '/home/usera/.ssh'.
5. Enter passphrase (empty for no passphrase): 
6. Enter same passphrase again: 
7. Your identification has been saved in /home/usera/.ssh/id_rsa.
8. Your public key has been saved in /home/usera/.ssh/id_rsa.pub.
9. The key fingerprint is:
10. 39:f2:fc:70:ef:e9:bd:05:40:6e:64:b0:99:56:6e:01 usera@serverA
11. The key's randomart image is:
12. +--[ RSA 2048]----+
13. |          Eo*    |
14. |           @ .   |
15. |          = *    |
16. |         o o .   |
17. |      . S     .  |
18. |       + .     . |
19. |        + .     .|
20. |         + . o . |
21. |          .o= o. |
22. +-----------------+

ssh免密码登录配置方法 - 图1

此时会在/home/usera/.ssh目录下生成密钥对

1. [usera@serverA ~]$ ls -la .ssh
2. 总用量 16
3. drwx------  2 usera usera 4096  8月 24 09:22 .
4. drwxrwx--- 12 usera usera 4096  8月 24 09:22 ..
5. -rw-------  1 usera usera 1675  8月 24 09:22 id_rsa
6. -rw-r--r--  1 usera usera  399  8月 24 09:22 id_rsa.pub

然后将公钥上传到serverB 服务器的，并以userb用户登录

1. [usera@portalweb1 ~]$ ssh-copy-id userb@10.124.84.20
2. The authenticity of host '10.124.84.20 (10.124.84.20)' can't be established.
3. RSA key fingerprint is f0:1c:05:40:d3:71:31:61:b6:ad:7c:c2:f0:85:3c:cf.
4. Are you sure you want to continue connecting (yes/no)? yes
5. Warning: Permanently added '10.124.84.20' (RSA) to the list of known hosts.
6. userb@10.124.84.29's password: 
7. Now try logging into the machine, with "ssh 'userb@10.124.84.20'", and check in:
8. 
9.   .ssh/authorized_keys
10. 
11. to make sure we haven't added extra keys that you weren't expecting.

ssh免密码登录配置方法 - 图2

这个时候usera的公钥文件内容会追加写入到userb的 .ssh/authorized_keys 文件中

1. [usera@serverA ~]$ cat .ssh/id_rsa.pub 
2. ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA2dpxfvifkpswsbusPCUWReD/mfTWpDEErHLWAxnixGiXLvHuS9QNavepZoCvpbZWHade88KLPkr5XEv6M5RscHXxmxJ1IE5vBLrrS0NDJf8AjCLQpTDguyerpLybONRFFTqGXAc/ximMbyHeCtI0vnuJlvET0pprj7bqmMXr/2lNlhIfxkZCxgZZQHgqyBQqk/RQweuYAiuMvuiM8Ssk/rdG8hL/n0eXjh9JV8H17od4htNfKv5+zRfbKi5vfsetfFN49Q4xa7SB9o7z6sCvrHjCMW3gbzZGYUPsj0WKQDTW2uN0nH4UgQo7JfyILRVZtwIm7P6YgsI7vma/vRP0aw== usera@serverA

查看serverB服务器userb用户下的 ~/.ssh/authorized_keys文件，内容是一样的，此处我就不粘贴图片了。

1. [userb@serverB ~]$ cat .ssh/authorized_keys 
2. ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA2dpxfvifkpswsbusPCUWReD/mfTWpDEErHLWAxnixGiXLvHuS9QNavepZoCvpbZWHade88KLPkr5XEv6M5RscHXxmxJ1IE5vBLrrS0NDJf8AjCLQpTDguyerpLybONRFFTqGXAc/ximMbyHeCtI0vnuJlvET0pprj7bqmMXr/2lNlhIfxkZCxgZZQHgqyBQqk/RQweuYAiuMvuiM8Ssk/rdG8hL/n0eXjh9JV8H17od4htNfKv5+zRfbKi5vfsetfFN49Q4xa7SB9o7z6sCvrHjCMW3gbzZGYUPsj0WKQDTW2uN0nH4UgQo7JfyILRVZtwIm7P6YgsI7vma/vRP0aw== usera@serverA

另外我们要注意，.ssh目录的权限为700，其下文件authorized_keys和私钥的权限为600。否则会因为权限问题导致无法免密码登录。我们可以看到登陆后会有known_hosts文件生成。

1. [useb@serverB ~]$ ls -la .ssh
2. total 24
3. drwx------.  2 useb useb 4096 Jul 27 16:13 .
4. drwx------. 35 useb useb 4096 Aug 24 09:18 ..
5. -rw-------   1 useb useb  796 Aug 24 09:24 authorized_keys
6. -rw-------   1 useb useb 1675 Jul 27 16:09 id_rsa
7. -rw-r--r--   1 useb useb  397 Jul 27 16:09 id_rsa.pub
8. -rw-r--r--   1 useb useb 1183 Aug 11 13:57 known_hosts

这样做完之后我们就可以免密码登录了

[usera@serverA ~]$ ssh userb@10.124.84.20

另外，将公钥拷贝到服务器的~/.ssh/authorized_keys文件中方法有如下几种：
1、将公钥通过scp拷贝到服务器上，然后追加到~/.ssh/authorized_keys文件中，这种方式比较麻烦。scp -P 22 ~/.ssh/id_rsa.pub user@host:~/。
2、通过ssh-copy-id程序，就是我演示的方法，ssh-copyid user@host即可
3、可以通过cat ~/.ssh/id_rsa.pub | ssh -p 22 user@host ‘cat >> ~/.ssh/authorized_keys’，这个也是比较常用的方法，因为可以更改端口号。

https://blog.csdn.net/universe_hao/article/details/52296811