经常在不同linux机器之间互相scp拷文件，每次总是要输入密码才可行。
通过ssh-keygen生成公钥，在两台机器之间互相建立信任通道即可。
假设本地机器client，远程机器为server。
1. 生成rsa keygen
[[email protected] winter] $ ssh-keygen -b 1024 -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/winter/.ssh/id_rsa): <Enter>
Enter passphrase (empty for no passphrase): <Enter>
Enter same passphrase again: <Enter>
Your identification has been saved in /home/winter/.ssh/id_rsa.
Your public key has been saved in /home/winter/.ssh/id_rsa.pub.
The key fingerprint is:
33:d4:7b:9c:87:04:cf:14:40:22:6d:c7:15:78:97:6a [email protected]
直接上面公钥和私钥存放地址可以直接回车，私钥密码可以直接回车，也可以输入。
2. 查看.ssh目录下了多私钥和公钥文件
[[email protected] winter] $ ls .ssh/
id_rsa id_rsa.pub known_hosts
3. 拷贝公钥到目标机器上，并改名成authorized_keys
[[email protected] winter] $ scp .ssh/id_rsa.pub [email protected]:/home/server/.ssh/authorized_keys
如果多人用一个服务器，那么只需要把自己生成的id_rsa.pub的内容>>到服务器的authorized_keys里就行了
4.如果出现Agent admitted failure to sign using the key 问题：
解決方法：
使用 ssh-add 指令將私钥加进来（根据个人的密匙命名不同更改 id_rsa）
# ssh-add ~/.ssh/id_rsa