第一步：进入ssh文件夹
$：cd ~/.ssh
第二步：获取git的密钥
$：ssh-keygen -t rsa -b 4096 -C "email@email.com" -f id_rsa_github
id_rsa_github：是密钥文件
第三步：复制密钥
$：clip < ~/.ssh/id_rsa_github.pub
第四步：需要在.ssh文件夹下面创建config文件
Host github.com
HostName github.com
User user1
PreferredAuthentications publickey
IdentityFile ~/.ssh/id_ras_github ## 这个是创建的密钥文件
如果有多个的话，可以复制多份
Host github.com
HostName github.com
User user1
PreferredAuthentications publickey
IdentityFile ~/.ssh/id_ras_github1
Host github.com
HostName github.com
User user1
PreferredAuthentications publickey
IdentityFile ~/.ssh/id_ras_github2
第五步：
git clone git@gitlab.xxx.com:second/test.git
