将公钥保存到服务器实现免密SSH登录

1. 创建ssh key

ssh-keygen

会得到一个公钥~/.ssh/id_rsa.pub, 一个私钥~/.ssh/id_rsa.

2. 将公钥添加到服务器的认证列表

scp -p <port_number> ~/.ssh/id_rsa.pub <user_name>@1.2.3.4:/root/.ssh/authorized_keys