ssh远程主机的免密登录配置

ssh经常登录远程主机，需要输入密码，很麻烦，怎样变懒呢？

test environment:

     hostA:ubuntu14.04  username:frank ip:192.168.1.109

     hostB:ubuntu12.04  username:frank ip:192.168.1.107

 

1.hostA ssh-keygen 生成公钥 

　　cd ~

　　ssh-keygen -t rsa

 

2.copy hostA的公钥到 hostB:frank

     scp /home/frank/.ssh/id_rsa.pub frank@192.168.1.107:/home/frank/.ssh/authorized_keys

 

3.login hostB in hostA,(first time, you need to input hostB's passward)