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

root@192.168.91.135'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 root@192.168.91.135

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 root@192.168.91.135:/root/.ssh/authorized_keys

root@192.168.91.135'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 root@192.168.91.135

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：

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[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== root@localhost.localdomain", 　　"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