Linux下实现免密登录

过程如下：

1.Linux下生成密钥

通过命令”ssh-keygen -t rsa“

　2.1 通过ssh-copy-id的方式

　　　　命令： ssh-copy-id -i ~/.ssh/id_rsa.put <romte_ip>

[root@ test . ssh ] # ssh-copy-id -i ~/.ssh/id_rsa.pub 192.168.91.135

[email protected]'s password:

Now try logging into the machine, with "ssh '192.168.91.135'" , and check in :

. ssh /authorized_keys

to make sure we haven 't added extra keys that you weren' t expecting.

[root@ test . ssh ] # ssh [email protected]

Last login: Mon Oct 10 01:25:49 2016 from 192.168.91.133

[root@localhost ~] #

2.2　通过scp将内容写到对方的文件中

命令：scp -p ~/.ssh/id_rsa.pub root@<remote_ip>:/root/.ssh/authorized_keys

 
  [root@ 
  test 
  . 
  ssh 
  ] 
  # scp -p ~/.ssh/id_rsa.pub [email protected]:/root/.ssh/authorized_keys 
 
  [email protected]'s password:  
 
  id_rsa.pub 100% 408 0.4KB 
  /s 
  00:00  
 
  [root@ 
  test 
  . 
  ssh 
  ] 
  #  
 
  [root@ 
  test 
  . 
  ssh 
  ] 
  #  
 
  [root@ 
  test 
  . 
  ssh 
  ] 
  #  
 
  [root@ 
  test 
  . 
  ssh 
  ] 
  # ssh [email protected] 
 
  Last login: Mon Oct 10 01:27:02 2016 from 192.168.91.133 
 
  [root@localhost ~] 
  # 
 
2.3 通过Ansible实现批量免密
2.3.1 将需要做免密操作的机器hosts添加到/etc/ansible/hosts下：
　　[Avoid close]
　　192.168.91.132
　　192.168.91.133
　　192.168.91.134
2.3.2 执行命令进行免密操作
　　ansible <groupname> -m authorized_key -a "user=root key='{{ lookup('file','/root/.ssh/id_rsa.pub') }}'" -k
示例：
 
      ? 
     
           [root@ 
           test 
           sshpass-1.05] 
           # ansible test -m authorized_key -a "user=root key='{{ lookup('file','/root/.ssh/id_rsa.pub') }}'" -k 
          
           　　SSH password: ----->输入密码 
          
           　　192.168.91.135 | success >> { 
          
           "changed" 
           :  
           true 
           ,  
          
           "key" 
           :  
           "ssh-rsa 　　 AAAAB3NzaC1yc2EAAAABIwAAAQEArZI4kxlYuw7j1nt5ueIpTPWfGBJoZ8Mb02OJHR8yGW7A3izwT3/uhkK7RkaGavBbAlprp5bxp3i0TyNxa/apBQG5NiqhYO8YCuiGYGsQAGwZCBlNLF3gq1/18B6FV5moE/8yTbFA4dBQahdtVP PejLlSAbb5ZoGK8AtLlcRq49IENoXB99tnFVn3gMM0aX24ido1ZF9RfRWzfYF7bVsLsrIiMPmVNe5KaGL9kZ0svzoZ708yjWQQCEYWp0m+sODbtGPC34HMGAHjFlsC/SJffLuT/ug/hhCJUYeExHIkJF8OyvfC6DeF7ArI6zdKER7D8M0SM　　WQmpKUltj2nltuv3w== [email protected]" 
           ,  
          
           "key_options" 
           : null,  
          
           "keyfile" 
           :  
           "/root/.ssh/authorized_keys" 
           ,  
          
           "manage_dir" 
           :  
           true 
           ,  
          
           "path" 
           : null,  
          
           "state" 
           :  
           "present" 
           ,  
          
           "unique" 
           :  
           false 
           ,  
          
           "user" 
           :  
           "root" 
          
           　　} 
          
           　　[root@ 
           test 
           sshpass-1.05] 
           #

2.4 手工复制粘贴的方式

　　将本地id_rsa.pub文件的内容拷贝至远程服务器的~/.ssh/authorized_keys文件中

Linux下实现免密登录

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