CentOS6 安装saltstack
epel安装：salt安装需要epel源支持，所以在安装salt前需要先安装epel包wget http://ftp.linux.ncsu.edu/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
rpm -ivh epel-release-6-8.noarch.rpm
服务端安装：
yum -y install salt-master
客户端安装：
yum -y install salt-minion
如果出现安装错误：Error: Cannot retrieve metalink for repository: epel. Please verify its path and try again
将/etc/yum.repos.d/epel.repo中的mirrorlist注释掉，baseurl前的#删除
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