linux下免密码证书登入设置&遇到问题解决办法

1、远程：192.168.1.11
2、本地：192.168.1.10

步骤
1、创建密钥
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ssh-keygen -t rsa
luoyangbo@localhost:~/.ssh$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter passphrase (empty for no passphrase): (忽略)
Enter same passphrase again: (忽略)
Your identification has been saved in /home/luoyangbo/.ssh/id_rsa.
Your public key has been saved in /home/luoyangbo/.ssh/id_rsa.pub.
2、复制公密到服务器

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scp id_rsa.pub [email]luoyangbo@192.168.1.11[/email]:/home/luoyangbo/.ssh/192.168.1.10

luoyangbo@localhost:~/.ssh$ scp id_rsa.pub [email]miao@192.168.1.112[/email]:/home/luoyangbo/.ssh/192.168.1.11
[email]luoyangbo@192.168.1.11[/email]'s password:
id_rsa.pub                                                                   100%  404     0.4KB/s   00:00

3、添加公密到192.168.11的信任区域
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cat 192.168.1.10 >> authorized_keys

注： 2，3两步可由命令ssh-copy-id一步到位
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ssh-copy-id [email]luoyangbo@192.168.1.11[/email]

luoyangbo@localhost:~/.ssh$ ssh-copy-id [email]luoyangbo@192.168.1.11[/email]
Password:
Now try logging into the machine, with "ssh 'luoyangbo@192.168.1.11'", and check in:

  .ssh/authorized_keys

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

4、启动ssh-agent
如果ssh 192.168.11返回 Agent admitted failure to sign using the key
ps -Af | grep agent查看有无ssh-agent有无运行，若没有
luoyangbo@localhost:~/.ssh$ ssh-agent

5、添加id_rsa到ssh-agent
luoyangbo@localhost:~/.ssh$ ssh-add id_rsa

PS:遇到问题&解决办法
   一切完成后，ssh远程仍然需要密码验证。
   这时只需要修改远程机器.ssh及其下面文件的权限即可
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chown username: /home/username/.ssh
chown username: /home/username/.ssh/*
chmod 700 /home/username/.ssh
chmod 600 /home/username/.ssh/*