ubuntu hadoop 环境创建ssh无密码登录 localhost

这几天在自己的ubuntu机器上，研究sector/sphere，突然发现我原来在公司配置ssh无密码登录的办法无效，后来搜索后知道了原因，现将ubuntu上设置ssh无密码登录的步骤列出来：

步骤
1.创建密钥

~/.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 /.ssh/id_rsa.
 
Your public key has been saved in /.ssh/id_rsa.pub.
 
 

2.添加公密到信任列表

~/.ssh$ cat 192.168.1.110 >> authorized_keys
 
~/.ssh$
 
 

3.启动ssh-agent (以前没有做过的步骤)
如果ssh localhost返回这样的提示

Agent admitted failure to sign using the key
ps -aux|grep agent查看有无ssh-agent有无运行，若没有

~/.ssh$ ssh-agent
 
 

4.添加id_rsa到ssh-agent

~/.ssh$ ssh-add id_rsa