----------闲 扯-----------
这里首先感谢酒哥的构建高可用的Linux服务器的这本书，看了这本书上并参考里面的配置让自己对DRBD+HeartBeat+NFS思路顿时清晰了许多，最后吐槽下，yum安装真心坑爹，以后如果非必须，尽量源码包安装。
----------开 搞-----------
系统版本： CentOS6.3 x64（内核2.6.32）
DRBD： DRBD-8.4.3
HeartBeat：epel更新源（真坑）
NFS: 系统自带
HeartBeat VIP: 192.168.7.90
Primary DRBD+HeartBeat: 192.168.7.88（drbd1.example.com）
Secondary DRBD+HeartBeat: 192.168.7.89 (drbd2.example.com)
(Primary)为仅主服务器端配置
(Secondary)为仅从服务器端配置
(Primary,Secondary)为主服务器端从服务器端共同配置
二.Hearbeat配置；
这里接着DRBD系统环境及安装配置：
1.安装heartbeat（CentOS6.3中默认不带有Heartbeat包，因此需要从第三方下载）(Primary,Secondary)
# wget ftp://mirror.switch.ch/pool/1/mirror/scientificlinux/6rolling/i386/os/Packages/epel-release-6-5.noarch.rpm
# rpm -ivUh epel-release-6-5.noarch.rpm
# yum --enablerepo=epel install heartbeat -y
2.配置heartbeat
(Primary）
# vi /etc/ha.d/ha.cf
---------------
# 日志
logfile /var/log/ha-log
logfacility local0
# 心跳监测时间
keepalive 2
# 死亡时间
deadtime 5
# 指定对方IP：
ucast eth0 192.168.7.89
# 服务器正常后由主服务器接管资源，另一台服务器放弃该资源
auto_failback off
#定义节点
node drbd1.example.com drbd2.example.com
---------------
（Secondary)
# vi /etc/ha.d/ha.cf
---------------
# 日志
logfile /var/log/ha-log
logfacility local0
# 心跳监测时间
keepalive 2
# 死亡时间
deadtime 5
# 指定对方IP：
ucast eth0 192.168.7.88
# 服务器正常后由主服务器接管资源，另一台服务器放弃该资源
auto_failback off
#定义节点
node drbd1.example.com drbd2.example.com
---------------
编辑双机互联验证文件：(Primary,Secondary)
# vi /etc/ha.d/authkeys
--------------
auth 1
1 crc
--------------
# chmod 600 /etc/ha.d/authkeys
编辑集群资源文件：(Primary，Secondary)
# vi /etc/ha.d/haresources
--------------
drbd1.example.com IPaddr::192.168.7.90/24/eth0 drbddisk::r0 Filesystem::/dev/drbd0::/data::ext4 killnfsd
--------------
该文件内IPaddr,Filesystem等脚本存放路径在/etc/ha.d/resource.d/下
编辑脚本文件killnfsd,用来重启NFS服务：
注：因为NFS服务切换后，必须重新mount NFS共享出来的目录，否则会报错。
# vi /etc/ha.d/resource.d/killnfsd
-----------------
killall -9 nfsd; /etc/init.d/nfs restart;exit 0
-----------------
赋予执行权限：
# chmod 755 /etc/ha.d/resource.d/killnfsd
创建DRBD脚本文件drbddisk:(Primary，Secondary)
注：
此处又是一个大坑，如果不明白Heartbeat目录结构的朋友估计要在这里被卡到死，因为默认yum安装Heartbeat，不会在/etc/ha.d/resource.d/创建drbddisk脚本，而且也无法在安装后从本地其他路径找到该文件。
此处本人也是因为启动Heartbeat后无法PING通虚IP，最后通过查看/var/log/ha-log日志，找到一行
ERROR: Cannot locate resource script drbddisk
然后进而到/etc/ha.d/resource.d/路径下发现竟然没有drbddisk脚本，最后在google上找到该代码，创建该脚本，终于测试通过：
# vi /etc/ha.d/resource.d/drbddisk
-----------------------
#!/bin/bash
#
# This script is inteded to be used as resource script by heartbeat
#
# Copright 2003-2008 LINBIT Information Technologies
# Philipp Reisner, Lars Ellenberg
#
###
DEFAULTFILE="/etc/default/drbd"
DRBDADM="/sbin/drbdadm"
if [ -f $DEFAULTFILE ]; then
. $DEFAULTFILE
fi
if [ "$#" -eq 2 ]; then
RES="$1"
CMD="$2"
else
RES="all"
CMD="$1"
fi
## EXIT CODES
# since this is a "legacy heartbeat R1 resource agent" script,
# exit codes actually do not matter that much as long as we conform to
#
# but it does not hurt to conform to lsb init-script exit codes,
# where we can.
#
#LSB-Core-generic/LSB-Core-generic/iniscrptact.html
####
drbd_set_role_from_proc_drbd()
{
local out
if ! test -e /proc/drbd; then
ROLE="Unconfigured"
return
fi
dev=$( $DRBDADM sh-dev $RES )
minor=${dev#/dev/drbd}
if [[ $minor = *[!0-9]* ]] ; then
# sh-minor is only supported since drbd 8.3.1
minor=$( $DRBDADM sh-minor $RES )
fi
if [[ -z $minor ]] || [[ $minor = *[!0-9]* ]] ; then
ROLE=Unknown
return
fi
if out=$(sed -ne "/^ *$minor: cs:/ { s/:/ /g; p; q; }" /proc/drbd); then
set -- $out
ROLE=${5%/**}
: ${ROLE:=Unconfigured} # if it does not show up
else
ROLE=Unknown
fi
}
case "$CMD" in
start)
# try several times, in case heartbeat deadtime
# was smaller than drbd ping time
try=6
while true; do
$DRBDADM primary $RES && break
let "--try" || exit 1 # LSB generic error
sleep 1
done
;;
stop)
# heartbeat (haresources mode) will retry failed stop
# for a number of times in addition to this internal retry.
try=3
while true; do
$DRBDADM secondary $RES && break
# We used to lie here, and pretend success for anything != 11,
# to avoid the reboot on failed stop recovery for "simple
# config errors" and such. But that is incorrect.
# Don't lie to your cluster manager.
# And don't do config errors...
let --try || exit 1 # LSB generic error
sleep 1
done
;;
status)
if [ "$RES" = "all" ]; then
echo "A resource name is required for status inquiries."
exit 10
fi
ST=$( $DRBDADM role $RES )
ROLE=${ST%/**}
case $ROLE in
Primary|Secondary|Unconfigured)
# expected
;;
*)
# unexpected. whatever...
# If we are unsure about the state of a resource, we need to
# report it as possibly running, so heartbeat can, after failed
# stop, do a recovery by reboot.
# drbdsetup may fail for obscure reasons, e.g. if /var/lock/ is
# suddenly readonly. So we retry by parsing /proc/drbd.
drbd_set_role_from_proc_drbd
esac
case $ROLE in
Primary)
echo "running (Primary)"
exit 0 # LSB status "service is OK"
;;
Secondary|Unconfigured)
echo "stopped ($ROLE)"
exit 3 # LSB status "service is not running"
;;
*)
# NOTE the "running" in below message.
# this is a "heartbeat" resource script,
# the exit code is _ignored_.
echo "cannot determine status, may be running ($ROLE)"
exit 4 # LSB status "service status is unknown"
;;
esac
;;
*)
echo "Usage: drbddisk [resource] {start|stop|status}"
exit 1
;;
esac
exit 0
-----------------------
赋予执行权限：
# chmod 755 /etc/ha.d/resource.d/drbddisk
在两个节点上启动HeartBeat服务，先启动Primary：(Primary,Secondary)
# service heartbeat start
# chkconfig heartbeat on