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配置ssh不需要密码登录远程主机，网上有很多文章，但好像完整的不多，笔者参照操作，但得到消息：

Agent admitted failure to sign using the key.

原来是没有启动ssh-agent及把私钥加入到ssh-agent，参考如下文章得以解决问题。下文是完整的配置无密码登录ssh远程主机的方法，推荐参阅。

[注]正文来自http://www.jiangmiao.org/blog/559.html，在此表示感谢！

现有2台机器

1、服务器192.168.1.112

2、个人机192.168.1.110

要使110无需密码通过ssh登入112

步骤

1、创建密钥

miao@u32-192-168-1-110:~/.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/miao/.ssh/id_rsa.
Your public key has been saved in /home/miao/.ssh/id_rsa.pub.

2、复制公密到服务器

miao@u32-192-168-1-110:~/.ssh$ scp id_rsa.pub miao@192.168.1.112:/home/miao/.ssh/192.168.1.110
miao@192.168.1.112's password:
id_rsa.pub                                                                   100%  404     0.4KB/s   00:00
miao@u32-192-168-1-110:~/.ssh$

3、添加公密到192.168.112的信任区域

miao@debian-192-168-1-112:~/.ssh$ cat 192.168.1.110 >> authorized_keys
miao@debian-192-168-1-112:~/.ssh$

注： 2，3两步可由命令ssh-copy-id一步到位

miao@ubuntu-192-168-1-110:~/.ssh$ ssh-copy-id miao@192.168.1.112
Password:
Now try logging into the machine, with "ssh 'miao@192.168.1.112'", 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 192.168.112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

miao@u32-192-168-1-110:~/.ssh$ ssh-agent

5、添加id_rsa到ssh-agent

miao@u32-192-168-1-110:~/.ssh$ ssh-add id_rsa

6、完成

from http://www.jiangmiao.org/blog/559.html