centos7 python多版本切换

1 引言

由于需要对Ambari进行编译，然而编译过程中需要用到Python2.6而centos自带为Python2.7，所以需要在centos中同时安装Python2.6 和 Python2.7。借鉴Java JDK的方法进行了一定探究，步骤记录如下

2 安装编译Python2.6的包

```

yum groupinstall "Development tools" //安装devtoolset

yum install zlib-devel //安装编译Python需要的包包

yum install bzip2-devel

yum install openssl-devel

yum install ncurses-devel

yum install sqlite-devel

```

3 下载Python2.6源码并编译安装

```

wget https://www.python.org/ftp/python/2.6.9/Python-2.6.9.tar.xz //下载python2.6包

tar -xf Python-2.6.9.tar.xz //解压python2.6包

cd Python-2.6.9 //切换路径

./configure //配置python源码

make && make altinstall //编译并安装，安装默认在/usr/local/bin/python2.6

```

4 配置软连接

```

mv /usr/bin/python2  /usr/bin/python2.bak

mv /usr/bin/python2-config  /usr/bin/python2-config.bak

ln -s /usr/local/bin/python2.6 /usr/bin/python2.6

ln -s /usr/local/bin/python2.6-config /usr/bin/python2.6-config

ln -s /usr/local/bin/python2 /usr/bin/python2.6

ln -s /usr/local/bin/python2-config /usr/bin/python2.6-config

```

5 修改yum配置使得其可用

```

vi /usr/bin/yum // 第一行改为#!/usr/bin/python2.7

vi /usr/libexec/urlgrabber-ext-down //第一行改为#!/usr/bin/python2.7

```