git安装：
yum install git 选择y
git版本查看
git --version
生成公钥：可以采用邮箱
ssh-keygen -t rsa -C "47.97.163.0@qq.com"
查看公钥：
cat /root/.ssh/id_rsa.pub
yum install git 选择y
git --version
ssh-keygen -t rsa -C "47.97.163.0@qq.com"
cat /root/.ssh/id_rsa.pub
