Centos5.6x86_64下安装drbd+heartbeat+nfs

   这篇文章其实是对《构建高可用Linux服务器(第二版)》中第五章中“生产下的高可用NFS文件服务器”一节的补充，其实像drbd和heartbeat这些软件都是可以通过yum来自动安装的，例如安装drbd的命令如下：

yum -y install drbd83 kmod-drbd83  

DRBD的配置文件/etc/drbd.conf如下所示：

global {  
# minor-count dialog-refresh disable-ip-verification  
usage-count no;         #统计drbd的使用  
}  
common {  
syncer  { rate 30M; }  #同步速率，视带宽而定  
}  
resource r0 {           #创建一个资源，名字叫”r0”  
protocol C;             #选择的是drbd的C 协议（数据同步协议，C为收到数据并写入后返回，确认成功）  
handlers {              #默认drbd的库文件  
pri-on-incon-degr "/usr/lib/drbd/notify-pri-on-incon-degr.sh; /usr/lib/drbd/notify-emergency-reboot.sh; echo b > /proc/sysrq-trigger ; reboot -f";  
pri-lost-after-sb "/usr/lib/drbd/notify-pri-lost-after-sb.sh; /usr/lib/drbd/notify-emergency-reboot.sh; echo b > /proc/sysrq-trigger ; reboot -f";  
local-io-error "/usr/lib/drbd/notify-io-error.sh; /usr/lib/drbd/notify-emergency-shutdown.sh; echo o > /proc/sysrq-trigger ; halt -f";  
# fence-peer "/usr/lib/drbd/crm-fence-peer.sh";  
# split-brain "/usr/lib/drbd/notify-split-brain.sh root";  
# out-of-sync "/usr/lib/drbd/notify-out-of-sync.sh root";  
# before-resync-target "/usr/lib/drbd/snapshot-resync-target-lvm.sh -p 15 -- -c 16k";  
# after-resync-target /usr/lib/drbd/unsnapshot-resync-target-lvm.sh;  
}  
startup {  
# wfc-timeout degr-wfc-timeout outdated-wfc-timeout wait-after-sb  
wfc-timeout 120;  
degr-wfc-timeout 120;       
}  
disk {  
# on-io-error fencing use-bmbv no-disk-barrier no-disk-flushes  
# no-disk-drain no-md-flushes max-bio-bvecs  
on-io-error detach;  
}  
net {  
# sndbuf-size rcvbuf-size timeout connect-int ping-int ping-timeout max-buffers  
# max-epoch-size ko-count allow-two-primaries cram-hmac-alg shared-secret  
# after-sb-0pri after-sb-1pri after-sb-2pri data-integrity-alg no-tcp-cork  
max-buffers 2048;  
cram-hmac-alg "sha1";  
shared-secret "123456";  
#allow-two-primaries;  
}  
syncer {  
rate 30M;  
# rate after al-extents use-rle cpu-mask verify-alg csums-alg  
}  
on centos1.cn7788.com { #设定一个节点，分别以各自的主机名命名  
device  /dev/drbd0; #设定资源设备/dev/drbd0 指向实际的物理分区 /dev/sdb1  
disk    /dev/sdb;  
address 192.168.11.32:7788;      #设定监听地址以及端口  
meta-disk       internal;  
}  
on centos2.cn7788.com {         #设定一个节点，分别以各自的主机名命名  
device  /dev/drbd0; #设定资源设备/dev/drbd0 指向实际的物理分区 /dev/sdb1  
disk    /dev/sdb;  
address 192.168.11.33:7788;       #设定监听地址以及端口  
meta-disk       internal;  
}  
}  

Heartbeat的配置文件如下： 

logfile /var/log/ha-log  
logfacility local0  
keepalive 2  
deadtime 15  
ucast eth0 192.168.11.32 
ucast eth1 10.0.0.2  
auto_failback off  
node centos1.cn7788.com centos2.cn7788.com 

补充说明的几点是：