一、主机资源：

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DRBD下载地址：http://oss.linbit.com/drbd/

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二、系统基本配置

master、slave都做如下配置。

1.配置/etc/hosts文件

 ~]# vi /etc/hosts

127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4

::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

192.168.0.152 master
192.168.0.153 slave

2.禁用selinux：

# sed -i "7s/enforcing/disabled/" /etc/selinux/config

3.禁用或卸载iptables，这里我们将iptables禁用：

1) 关闭防火墙-----service iptables stop
2)启动防火墙-----service iptables start
3)重启防火墙-----service iptables restart
4) 查看防火墙状态--service iptables status
5) 永久关闭防火墙--chkconfig iptables off
6) 永久关闭后启用--chkconfig iptables on

4.运行yum update升级内核：

# yum update
Loaded plugins: fastestmirror, presto
Loading mirror speeds from cached hostfile
 * base: mirrors.btte.NET
………

5.格式化/dev/sdb

#fdisk -l

#fdisk /dev/sdb

6.重启

reboot

三、安装DRBD 8.4.2（主备节点配置相同）

1.主备节点安装drbd编译环境：

# yum -y install gcc flex wget make kernel-devel kernel-headers Git libxslt rpm-build automake autoconf

2.下载DRBD安装文件

# wget http://oss.linbit.com/drbd/8.4/drbd-8.4.2.tar.gz

3.解压并安装DRBD文件

#tar -zvxf drbd-8.4.2.tar.gz
# cd drbd-8.4.2
drbd-8.4.2]# ./configure --prefix=/usr/local/drbd --with-km
drbd-8.4.2]# make KDIR=/usr/src/kernels/`uname -r`/
drbd-8.4.2]# make install

4.安装配置DRBD驱动模块

drbd-8.4.2]# cd drbd
drbd-8.4.2]# make clean
drbd-8.4.2]# make KDIR=/usr/src/kernels/`uname -r`/
drbd-8.4.2]# cp drbd.ko /lib/modules/`uname -r`/kernel/lib/
drbd-8.4.2]# depmod #创建模块依赖关系的列表
drbd-8.4.2]# cp /usr/local/drbd/etc/rc.d/init.d/drbd /etc/rc.d/init.d/
drbd-8.4.2]# chkconfig --add drbd
drbd-8.4.2]# chkconfig drbd on

四、定义DRBD 配置文件 （主备节点配置相同）

~]# cp /usr/local/drbd/etc/drbd.d/global_common.conf /usr/local/drbd/etc/drbd.d/global_common-bak.conf
~]# vi /usr/local/drbd/etc/drbd.d/global_common.conf

 global {
 usage-count yes; # 是否参加DRBD使用者统计.默认是yes
 # minor-count dialog-refresh disable-ip-verification
}

common {
 handlers {
 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";
 }

 startup {
 wfc-timeout 30;
 degr-wfc-timeout 30;
 outdated-wfc-timeout 30;
 }

 options {
 # cpu-mask on-no-data-accessible
 }

 disk {
 on-io-error detach;
 fencing resource-and-stonith;
 resync-rate 50M; # 设置主备节点同步时的网络速率最大值,单位是字节.
 }

 net {
 protocol C; # 使用协议C.表示收到远程主机的写入确认后,则认为写入完成.
 cram-hmac-alg sha1; # 设置主备机之间通信使用的信息算法.
 shared-secret "123456";
 }
}

~]# vi /usr/local/drbd/etc/drbd.d/Redis.res

 resource redis{ 
 on master { 
 device /dev/drbd1; #逻辑设备的路径 
 disk /dev/sdb; #物理设备 
 address 192.168.0.152:7788; #IP和监听端口
 meta-disk internal; 
 } 
 on slave { 
 device /dev/drbd1; 
 disk /dev/sdb; 
 address 192.168.0.153:7788; 
 meta-disk internal; 
 } 
}

~]# modprobe drbd #载入DRBD模块
~]# lsmod |grep drbd #确认DRBD模块载入成功

drbd 314184 0 
libcrc32c 1246 1 drbd

~]# drbdadm create-md redis #创建元数据

 --== Thank you for participating in the global usage survey ==--
The server's response is:

you are the 4070th user to install this version
md_offset 10737414144
al_offset 10737381376
bm_offset 10737053696

Found some data

 ==> This might destroy existing data! <==

Do you want to proceed?
[need to type 'yes' to confirm] yes

Writing meta data...
initializing activity log
NOT initializing bitmap
New drbd meta data block successfully created.
success

~]# mkdir -p /usr/local/drbd/var/run/drbd
~]# drbdadm up redis #启用资源

Device '1' is configured!
Command 'drbdmeta 1 v08 /dev/sdb internal apply-al' terminated with exit code 20

~]# cat /proc/drbd #查看DRBD状态

version: 8.4.2 (api:1/proto:86-101)
GIT-hash: 7ad5f850d711223713d6dcadc3dd48860321070c build by , 2012-12-31 20:26:02
1: cs:Connected ro:Secondary/Secondary ds:Inconsistent/Inconsistent C r-----
ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:10485404

~]# mkdir /drbd #为DRBD分区挂载创建路径

**********************************************************************************************************************

五、设置主节点Primary node（master配置）

~]# drbdadm primary --force redis #设置master角色为Primary
~]# mkfs.ext4 /dev/drbd1 #格式化drbd1(逻辑设备)

 mke2fs 1.41.12 (17-May-2010)
文件系统标签=
操作系统:Linux
块大小=4096 (log=2)
分块大小=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
655360 inodes, 2621351 blocks
131067 blocks (5.00%) reserved for the super user
第一个数据块=0
Maximum filesystem blocks=2684354560
80 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks: 
 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632
正在写入inode表: 完成 
Creating journal (32768 blocks):
Writing superblocks and filesystem accounting information: 完成
This filesystem will be automatically checked every 36 mounts or 180 days, whichever comes first. 
Use tune2fs -c or -i to override.

~]# mount /dev/drbd1 /drbd #挂载DRBD分区
~]# df -h

文件系统 容量 已用 可用 已用%% 挂载点
/dev/sda3 8.7G 1.1G 7.3G 13% /
tmpfs 497M 0 497M 0% /dev/shm
/dev/sda1 194M M 120M 35% /boot
/dev/drbd1 9.9G 151M 9.2G 2% /drbd

六、同步测试：

mater操作：

 ~]# ls
anaconda-ks.cfg drbd-8.4.2 drbd-8.4.2.tar.gz install.log install.log.syslog
~]# cp drbd-8.4.2.tar.gz /drbd
~]# ll /drbd
总用量 676
-rw-r--r-- 1 root root 675803 10月 15 21:14 drbd-8.4.2.tar.gz
drwx------ 2 root root 16384 10月 15 21:07 lost+found
~]# umount /dev/drbd1 #卸载挂载的DRBD分区
~]# drbdadm secondary redis #主节点角色降级

slave操作：

~]# drbdadm primary redis #备节点设置成primary角色
~]# mount /dev/drbd1 /drbd #备节点挂载DRBD分区
~]# df -h

文件系统 容量 已用 可用 已用%% 挂载点
/dev/sda3 8.7G 1.1G 7.3G 13% /
tmpfs 497M 0 497M 0% /dev/shm
/dev/sda1 194M M 120M 35% /boot
/dev/drbd1 9.9G 152M 9.2G 2% /drbd

~]# ll /drbd
总用量 676
-rw-r--r-- 1 root root 675803 10月 15 21:14 drbd-8.4.2.tar.gz
drwx------ 2 root root 16384 10月 15 21:07 lost+found

测试完成~！