Linux系统下下载git
卸载CentOS自带的Git
通过git –-version查看系统带的版本，Cento6.5自带的是git版本是1.7.1
yum remove git
安装前环境配置
$ yum install -y curl-devel expat-devel gettext-devel openssl-devel zlib-devel asciidoc xmlto perl-devel perl-CPAN autoconf*
下载git2.2.1并将git添加到环境变量中
wget https://github.com/git/git/archive/v2.2.1.tar.gz
tar zxvf v2.2.1.tar.gz
cd git-2.2.1
make configure
./configure --prefix=/usr/local/git --with-iconv=/usr/local/libiconv
make all doc
make install install-doc install-html
echo "export PATH=$PATH:/usr/local/git/bin" >> /etc/bashrc
source /etc/bashrc
查看版本号
git --version
由于升级了git版本，git clone 的时候报了如下的错误
SSL connect error
解决方法：
yum update -y nss curl libcurl