CentOS6.5下升级Git1.7.1 升级到 Git2.x

[TOC]

如果 go get github.com/go-sql-driver/mysql 或进行 clone ，会报如下错误

```shell
[root@gongwen src]# git --version
git version 1.7.1
[root@gongwen src]# git clone https://github.com/go-sql-driver/mysql.git
Initialized empty Git repository in /usr/local/src/mysql/.git/
error:  while accessing https://github.com/go-sql-driver/mysql.git/info/refs

fatal: HTTP request failed
```

这样我们就需要看一下，当前的git版本号是多少了
```shell
git --version
```
如果不是2.x版本。建议升级成2.x

#### 第一步 卸载CentOS自带的Git
```shell
yum remove git
```

#### 第二步 安装相关扩展
```shell
yum install -y curl-devel expat-devel gettext-devel openssl-devel zlib-devel asciidoc xmlto perl-devel perl-CPAN autoconf*
```

#### 第三步 下载git2.2.1并将git添加到环境变量中
```shell
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
.  /etc/bashrc
```
#### 验证
```shell
git --version
```

#### 备注
**如果升级之后 git clone报SSL connect error错误**
```shell
yum update -y nss curl libcurl
```
便可解决