原因: contos 自带git版本太低
yum remove git
1 wget https://www.kernel.org/pub/software/scm/git/git-2.9.5.tar.gz
2.安装依赖包
yum install curl-devel expat-devel gettext-devel openssl-devel zlib-devel gcc perl-ExtUtils-MakeMaker
$ tar -zxvf git-2.9.5.tar.gz
$ cd git-2.9.5
$ make prefix=/usr/local/git all
$ make prefix=/usr/local/git install
$ echo "export PATH=$PATH:/usr/local/git/bin" >> /etc/profile
$ source /etc/profile
$ git --version
git version 2.9.5
