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
原文：http://www.cnblogs.com/pinganzi/p/4723820.html