ssh 免密登录
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[root@localhost .ssh]# /usr/bin/ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
30:f6:d7:2a:ac:56:eb:3f:fa:40:25:8d:90:96:68:cb
root@localhost.localdomain
在主机/.ssh目录下生成密匙
使用ssh的rsa密匙
其中
id_rsa 私匙
id_rsa.pub 公匙
下述命令产生不同类型的密钥
ssh-keygen -t dsa
ssh-keygen -t rsa
ssh-keygen -t rsa1
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[root@localhost .ssh]# scp /root/.ssh/id_rsa.pubroot@172.16.142.5:/root/.ssh/authorized_keys
The authenticity of host '172.16.142.5 (172.16.142.5)' can't be established.
RSA key fingerprint is 4b:a5:74:fb:2e:08:60:af:fa:76:d4:b0:26:4c:13:75.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '172.16.142.5' (RSA) to the list of known hosts.
root@172.16.142.5's password:
id_rsa.pub 100% 236 0.2KB/s 00:00
说明：
将公钥拷贝到远端主机，并写入授权列表文件
你也可以把公钥文件拷贝过去后，在远端主机下直接执行
touch /root/.ssh/authorized_keys
cat /root/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys
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操作完毕，登陆检查。
[root@localhost .ssh]# ssh 172.16.142.5
root@172.16.142.5's password:
请注意此时如果仍提示输入密码，请检查如下文件夹和文件的操作权限，这是非常重要的， 否则ssh公钥认证体制不能正常工作：
172.16.142.4（客户端）
/home/root文件夹的权限是600
/home/root/.ssh文件夹的权限是600 （好像这个权限关系不是很大）
/home/root/.ssh/id_dsa私钥的权限600
172.16.142.5（远端主机）
/home/root文件夹的权限是644
/home/root/.ssh文件夹的权限是644 （好像这个权限关系不是很大）
/root/.ssh/authorized_keys公钥的权限644
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[root@localhost ~]# ssh 172.16.142.5
Last login: Sat Dec 15 21:10:17 2007 from 172.16.142.4
[root@localhost ~]#
无密码SSH登陆成功！
