源码安装
yum install -y curl-devel expat-devel gettext-devel openssl-devel zlib-devel
yum install -y gcc perl-ExtUtils-MakeMaker
确保系统git 已经被卸载
yum remove -y git(先执行本选项，确保卸载掉git)
cd /usr/src
wget https://www.kernel.org/pub/software/scm/git/git-2.9.3.tar.gz
tar xzf git-2.9.3.tar.gz
cd git-2.9.3
make prefix=/usr/bin/git all
make prefix=/usr/bin/git install
echo "export PATH=$PATH:/usr/bin/git/bin" >> /etc/bashrc
source /etc/bashrc
git --version (查看是否安装完成)
rpm 安装（基于CentOS7）
yum install -y epel-release （#error: Failed dependencies:epel-release = 7 is needed by ius-release-1.0-15.ius.centos7.noarch）
rpm -Uvh https://centos7.iuscommunity.org/ius-release.rpm
yum install git2u
git --version
