ssh 免密码登录

1、本地生成秘钥对：

注：私钥~/.ssh/id_rsa，公钥~/.ssh/id_rsa.pub

2、拷贝公钥到远端：

[ -f ~/.ssh/id_rsa ] || ssh-keygen -t rsa -f ~/.ssh/id_rsa  -P ''
cat ~/.ssh/id_rsa.pub | ssh 用户名@服务器ip "cat - >> ~/.ssh/authorized_keys"

3、免密码登录测试：

ssh 用户名@服务器ip