centos7 python多版本切換

1 引言

由於需要對Ambari進行編譯，然而編譯過程中需要用到Python2.6而centos自帶爲Python2.7，所以需要在centos中同時安裝Python2.6 和 Python2.7。借鑑Java JDK的方法進行了一定探究，步驟記錄如下

2 安裝編譯Python2.6的包

```

yum groupinstall "Development tools" //安裝devtoolset

yum install zlib-devel //安裝編譯Python需要的包包

yum install bzip2-devel

yum install openssl-devel

yum install ncurses-devel

yum install sqlite-devel

```

3 下載Python2.6源碼並編譯安裝

```

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

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

cd Python-2.6.9 //切換路徑

./configure //配置python源碼

make && make altinstall //編譯並安裝，安裝默認在/usr/local/bin/python2.6

```

4 配置軟連接

```

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 // 第一行改爲#!/usr/bin/python2.7

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

```