取消私钥中的密码：
1. 使用openssl命令去掉私钥的密码openssl rsa -in ~/.ssh/id_rsa -out ~/.ssh/id_rsa_new
2. 备份旧私钥mv ~/.ssh/id_rsa ~/.ssh/id_rsa.backup
3. 使用新私钥mv ~/.ssh/id_rsa_new ~/.ssh/id_rsa
4. 设置权限chmod 600 ~/.ssh/id_rsa

转自： http://ju.outofmemory.cn/entry/621