ssh 免密码登录

1.首先在电脑上生成公钥和私钥，放到.ssh 目录下
id_rsa.pub
id_rsa
2. 讲 id_rsa.pub拷贝到阿里云服务器的~/.ssh/下就是root/.ssh下
scp id_rsa.pub root@address:~/.ssh/id_rsa.pub
3.登录阿里云服务器
cd ~/.ssh
cat id_rsa.pub >> authorized_keys
4. exit 然后重新登录