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-drbd83DRBD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 100M; } #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16k"; # after-resync-target /usr/lib/drbd/unsnapshot-resync-target-lvm.sh; } startup { # wfc-timeout degr-wfc-timeout outdated-wfc-timeout wait-after-sb wfc-timeout 120; degr-wfc-timeout 120; } disk { # on-io-error fencing use-bmbv no-disk-barrier no-disk-flushes # no-disk-drain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 100M; # 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：