ssh-keygen -t rsa -f ~/.ssh/id_rsa.xxx -C ‘email’
id_rsa.xxx是我们指定的文件名,这时~/.ssh 目录下会多出 id_rsa.xxx 和 id_rsa.xxx.pub 两个文件,id_rsa.xxx.pub 里保存的就是我们要使用的 key
id_rsa.xxx
Host *.xxx.com IdentityFile ~/.ssh/id_rsa.xxx user xxx