centos
安装包[rpm]和光盘iso文件
http://mirror.centos.org/centos/
对应如上包的代码
http://vault.centos.org/ git.centos.org
centos7的ReleaseNote
10. Sources
All CentOS-7 sources are hosted at git.centos.org. All code released into the distribution originated from git.centos.org.
Source RPMs will also be published once the release is done, in the usual location at http://vault.centos.org/centos/7/
From a CentOS machine you can easily retrieve sources using the yumdownloader --source <packagename> command.
CentOS 6 高可用服务 Heartbeat v3 安装以及配置
http://www.tuicool.com/articles/rMBFj2
Redhat
Redhat的开源代码和rpm包地址
http://dl.fedoraproject.org/pub/
http://www.cnblogs.com/magialmoon/p/3618055.html
epel包是啥
http://fedoraproject.org/wiki/EPEL/zh-cn
企业版 Linux 附加软件包(以下简称 EPEL)是一个由特别兴趣小组创建、维护并管理的，针对 红帽企业版 Linux(RHEL)及其衍生发行版(比如 CentOS、Scientific Linux、Oracle Enterprise Linux)的一个高质量附加软件包项目。
如heatbeat的一个安装方法[redhat6]
# wget http://mirrors.sohu.com/fedora-epel/6/i386/epel-release-6-8.noarch.rpm
# rpm -ivh epel-release-6-8.noarch.rpm
# yum install heartbeat*
redhat7下heartbeat没有捆绑的rpm包
http://dl.fedoraproject.org/pub/epel/7/x86_64/repoview/letter_h.group.html