yum -y install salt-master 安装时，出现以下报错：

 file /usr/lib64/python2.6/zipfile.pyc from install of python-libs-2.6.6-66.el6_8.x86_64 conflicts with file from package python-2.6.6-36.el6.x86_64
  file /usr/lib64/python2.6/zipfile.pyo from install of python-libs-2.6.6-66.el6_8.x86_64 conflicts with file from package python-2.6.6-36.el6.x86_64

从报错信息中可以发现conflicts，这是冲突的意思，即python-libs-2.6.6-66.el6_8.x86_64与python-2.6.6-36.el6.x86_64发生冲突；

查询发现系统已经安装了2.6.6-26版本

[root@m01 ~]# rpm -q python-libs
python-libs-2.6.6-36.el6.x86_64
[root@m01 ~]# rpm -q python
python-2.6.6-36.el6.x86_64

而yum安装salt-master的版本是2015.5.10-2.el6 ，需要python-libs-2.6.6-66.el6.x86_64版本，因此导致发生冲突

python-libs-2.6.6-66.el6_8.x86_6
python-2.6.6-36.el6.x86_64

尝试卸载发生冲突的包然后安装需要的版本，可以发现卸载不了，这个包被其它包依赖，受保护，不能卸载
yum -y remove python-2.6.6-36.el6.x86_64

Error: Trying to remove "yum", which is protected
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest

换个思维，那我是否可以升级

yum -y update  python-2.6.6-36.el6.x86_64
[root@m01 ~]# rpm -qa python-libs  
python-libs-2.6.6-66.el6_8.x86_64
[root@m01 ~]# rpm -qa python
python-2.6.6-66.el6_8.x86_64

升级后果然可以安装salt-master了