安装saltstack

准备工作：

安装python3.7 和 pip-19.0.3

下载链接：https://pan.baidu.com/s/10FJfY8YE7yqnbhzMXP_04w
提取码：upiz

cd /usr/src/Python-3.7.3
./configure
make
make install

　　

vim /usr/bin/yum

#!/usr/bin/python  ==>   #!/usr/bin/python2.7 

vi /usr/libexec/urlgrabber-ext-down

#!/usr/bin/python  ==>   #!/usr/bin/python2.7 

如果不修改urlgrabber-ext-down文件，用yum安装软件时会出现下面的情况：

===================================================================================
Installing:
 net-tools        x86_64        2.0-0.24.20131004git.el7         base        306 k

Transaction Summary
===================================================================================
Install  1 Package

Total download size: 306 k
Installed size: 918 k
Downloading packages:


Error downloading packages:
  net-tools-2.0-0.24.20131004git.el7.x86_64: [Errno 5] [Errno 2] No such file or directory