配置主机之间的信任关系

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下面是用root用户执行配置的，也可以切换到其他用户去做这个配置，那么跳转的时候就 ssh username@192.168.1.13即可


1.生成各个主机自己的秘钥文件
主机a和主机b相同操作
# cd .ssh
# ls -lrt
total 12
-rw-r--r-- 1 root root 857 Sep 13 14:26 authorized_keys
-rw-r--r-- 1 root root 4725 Oct 29 16:29 known_hosts

# rm -f authorized_keys
# rm -f known_hosts
# ssh-keygen -t dsa ---有的是用rsa，一路回车即可
Generating public/private dsa key pair.
Enter file in which to save the key (/root/.ssh/id_dsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_dsa.
Your public key has been saved in /root/.ssh/id_dsa.pub.
The key fingerprint is:
34:8a:16:02:25:dc:20:ae:ee:95:b1:32:99:e7:3b:6c root@sfxbdb04.sf-express.com

# ls -lrt
total 8
-rw-r--r-- 1 root root 618 Oct 30 16:55 id_dsa.pub
-rw------- 1 root root 668 Oct 30 16:55 id_dsa
# cat id_dsa.pub >>authorized_keys

2.把主机a的authorized_keys传到另一台主机b相同目录
scp authorized_keys root@192.168.1.14:/root/.ssh

3.主机b将自身的秘钥写入authorized_keys
# ls -l
total 12
-rw-r--r-- 1 root root 1854 Oct 30 16:59 authorized_keys
-rw------- 1 root root 668 Oct 30 16:55 id_dsa
-rw-r--r-- 1 root root 618 Oct 30 16:55 id_dsa.pub

cat id_dsa.pub >>authorized_keys

4.查看
cat -n authorized_keys

5.再把这个传回去给主机a就可以了。
scp authorized_keys root@192.168.1.13:/root/.ssh

6.跳转测试（2台主机都能成功执行下面2个即成功）
ssh 192.168.1.13
ssh 192.168.1.14

记得第一次需要yes一下
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