安装hma master出错 Error: Package: perl-Mail-Sender-0.8.13-2.el5.1.noarch

You are using the EPEL 5 version of the repo instead of 6, go into your /etc/yum.repos.d/epel.repo file and change:

mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=epel-5&arch=$basearch

to

mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=epel-6&arch=$basearch

Then run

yum clean all 

and then try and install again.

yum -y install perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager

安装master节点：

rpm -Uvh http://mysql-master-ha.googlecode.com/files/mha4mysql-manager-0.52-0.noarch.rpm

yum update atomic-release
You have to bypass Yum by installing the latest version like this:
wget -q -O - https://www.atomicorp.com/installers/atomic | sh

完毕。