Linux负载均衡

http://www.askwan.com/post/28/
haproxy+keepalived
Linux企业集群
http://book.51cto.com/art/200806/76015.htm#
第一步:rsync同步web数据（测试通过并且自己加入了ssh的RSA key验证）
http://www.linuxsir.org/main/?q=node/256   rsync 服务器架设方法 v0.1b （正在修订中）
第二步:安装heartbeat并且可以故障切换(正在学习中..)
centos 5.2
yum install -y heartbeat heartbeat-devel heartbeat-ldirectord heartbeat-gui piranha
第三步:配置heartbeat
因为是rpm安装所以默认/etc/ha.d/中没有包含ha.cf,authkeys,haresources这三个文件必须拷贝过来
rpm查询cat /etc/ha.d/README.config
You need three configuration files to make heartbeat happy,
and they all go in this directory.
They are:
        ha.cf           Main configuration file
        haresources     Resource configuration file
        authkeys        Authentication information
These first two may be readable by everyone, but the authkeys file
must not be.
The good news is that sample versions of these files may be found in
the documentation directory (providing you installed the documentation).
If you installed heartbeat using rpm packages then
this command will show you where they are on your system:
                rpm -q heartbeat -d
If you installed heartbeat using Debian packages then
the documentation should be located in /usr/share/doc/heartbeat
然后利用cp把三个文件拷贝到/etc/ha.d/中
第四步:具体安装
http://linux.chinaunix.net/bbs/viewthread.php?tid=1051263
heartbeat2.x的测试终结篇，针对使用heartbeat的新手
注意:例如我们想做httpd的双机热备份的话,首先要把httpd的启动脚本从init中删除
chkconfig --del httpd
chkconfig --level 345 httpd off
删除完成以后修改haresources
HA2 192.168.0.40 httpd
注意这里生成完成了还是不能用必须用