centos6上yum安装drbd（内核：2.6.32.696）

author：headsen  chen 

date: 2017-11-20  15:11:21

notice: 个人原创，转载请注明，否则依法追究法律责任

前期准备：

 两台机器：配置主机名分别为： local.aaa.com 和local2.aaa.com

                  配置IP地址分别为:   192.168.115.143 和 192.168.115.180 并且能上网

                  配置时间服务：ntpdate ,使得两台主机的时间都准确并一致

                  配置两台主机的hosts文件，使得都能相互ping通主机名

                  

 1，安装（两台都要）

[root@client 桌面]# wget http://www.elrepo.org/elrepo-release-6-8.el6.elrepo.noarch.rpm

 [root@client 桌面]# yum -y install elrepo-release-6-8.el6.elrepo.noarch.rpm

 [root@client 桌面]# yum -y install drbd84-utils kmod-drbd84

[root@client 桌面]# modprobe drbd
[root@client 桌面]# lsmod | grep drbd
drbd 374888 0
libcrc32c 1246 1 drbd
[root@client 桌面]#

2，分区（但不格式化和挂载，两台都要）（两台服务器的同步分区要一样大）

[root@local2 桌面]# lsblk

[root@local2 桌面]# fdisk /dev/sdb

[root@local2 桌面]# lsblk
。。。
sdb 8:16 0 5G 0 disk
├─sdb1 8:17 0 2G 0 part
└─sdb2 8:18 0 2G 0 part
sr0 11:0 1 1024M 0 rom
[root@local2 桌面]#

3,配置

3.1.参数配置：(两台都要)

vim /usr/local/drbd/etc/drbd.conf
清空里面的配置，添加如下配置：

resource r0{
protocol C;
startup { wfc-timeout 0; degr-wfc-timeout 120;}
disk { on-io-error detach;}
net{
timeout 60;
connect-int 10;
ping-int 10;
max-buffers 2048;
max-epoch-size 2048;
}
syncer { rate 100M;}
on local.aaa.com{
device /dev/drbd0;
disk /dev/sdb1;
address 192.168.115.143:7788;
meta-disk internal;
}
on local2.aaa.com{
device /dev/drbd0;
disk /dev/sdb1;
address 192.168.115.180:7788;
meta-disk internal;
}
}

将这个配置文件传到另外一台服务器上，要求两台服务器的这个配置文件要一模一样。

3.2.创建DRBD设备并激活r0资源：两台都要)

# mknod /dev/drbd0 b 147 0

# drbdadm create-md r0

等待片刻，显示success表示drbd块创建成功
----------------
Writing meta data...
initializing activity log
NOT initializing bitmap
New drbd meta data block successfully created.
               --== Creating metadata ==--
As with nodes, we count the total number of devices mirrored by DRBD
at http://usage.drbd.org.
The counter works anonymously. It creates a random number to identify
the device and sends that random number, along with the kernel and
DRBD version, to usage.drbd.org.
http://usage.drbd.org/cgi-bin/insert_usage.pl?
nu=716310175600466686&ru=15741444353112217792&rs=1085704704
* If you wish to opt out entirely, simply enter 'no'.
* To continue, just press [RETURN]        //出现[RETURN]按回车
success
----------------
再次输入该命令：
# drbdadm create-md r0
成功激活r0
----------------
[need to type 'yes' to confirm] yes
Writing meta data...
initializing activity log
NOT initializing bitmap
New drbd meta data block successfully created.

3.3 启动DRBD服务：(两台都要)

# service drbd start

注：需要主从共同启动方能生效

3.4.查看状态：(两台都要)

cat /proc/drbd

version: 8.4.3 (api:1/proto:86-101)
GIT-hash: 89a294209144b68adb3ee85a73221f964d3ee515 build by root@drbd1.example.com,
2013-05-27 20:45:19
0: 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:1060184

或者

service drbd status

drbd driver loaded OK; device status:
version: 8.4.3 (api:1/proto:86-101)
GIT-hash: 89a294209144b68adb3ee85a73221f964d3ee515 build by root@drbd1.example.com,
2013-05-27 20:45:19
m:res  cs         ro                   ds                         p  mounted  fstype
0:r0   Connected  Secondary/Secondary  Inconsistent/Inconsistent  C

注：这里ro:Secondary/Secondary表示两台主机的状态都是备机状态，ds是磁盘状态，显示的状态内容为“不一致”，这是因为DRBD无法判断哪一方为主机，应以哪一方的磁盘数据作为标准。

3.5.将drbd1主机配置为主节点：(node1)

# drbdsetup /dev/drbd0 primary --force

分别查看主从DRBD状态：

(node1)

service drbd status

drbd driver loaded OK; device status:
version: 8.4.3 (api:1/proto:86-101)
GIT-hash: 89a294209144b68adb3ee85a73221f964d3ee515 build by root@local.aaa.com,
2013-05-27 20:45:19
m:res  cs         ro                 ds                 p  mounted  fstype
0:r0   Connected  Primary/Secondary  UpToDate/UpToDate  C

(node2)

service drbd status

drbd driver loaded OK; device status:
version: 8.4.3 (api:1/proto:86-101)
GIT-hash: 89a294209144b68adb3ee85a73221f964d3ee515 build by root@local2.aaa.com,
2013-05-27 20:49:06
m:res  cs         ro                 ds                 p  mounted  fstype
0:r0   Connected  Secondary/PrimaryUpToDate/UpToDate  C

注：ro在主服务器上显示 Primary/Secondary , ds显示UpToDate/UpToDate;

      ro在从服务器上显示 Secondary/Primary  , ds显示UpToDate/UpToDate表示主从配置成功。

3.6 挂载DRBD：(node1)

从刚才的状态上看到mounted和fstype参数为空，所以我们这步开始挂载DRBD到系统目录

# mkfs.ext4 /dev/drbd0

# mount /dev/drbd0 /data

注：Secondary节点上不允许对DRBD设备进行任何操作，包括只读，所有的读写操作只能在Primary节点上进行，只有当Primary节点挂掉时，Secondary节点才能提升为Primary节点继续工作。

 

4、模拟故障

(node1)

cd /data
touch 1 2 3 4 5
cd ..
umount /data
drbdsetup /dev/drbd0 secondary

注：这里实际生产环境若DRBD1宕机，在DRBD2状态信息中ro的值会显示为Secondary/Unknown,只需要进行DRBD提权操作即可。 (node2)

drbdsetup /dev/drbd0 primary
mount  /dev/drbd0 /data
cd /data
touch 6 7 8 9 10
ls
--------------
1  10  2  3  4  5  6  7  8  9  lost+found

查看(node1)(node2)DRBD状态：

(node2)
service drbd status

drbd driver loaded OK; device status:
version: 8.4.3 (api:1/proto:86-101)
GIT-hash: 89a294209144b68adb3ee85a73221f964d3ee515 build by root@local2.aaa.com,
2013-05-27 20:49:06
m:res  cs         ro                 ds                 p  mounted  fstype
0:r0   Connected  Primary/Secondary  UpToDate/UpToDate  C  /data    ext4


(node1)
service drbd status

drbd driver loaded OK; device status:
version: 8.4.3 (api:1/proto:86-101)
GIT-hash: 89a294209144b68adb3ee85a73221f964d3ee515 build by root@local.aaa.com,
2013-05-27 20:45:19
m:res  cs         ro                 ds                 p  mounted  fstype
0:r0   Connected  Secondary/Primary  UpToDate/UpToDate  C