CentOS版本:CentOS release 5.5 (Final)
系统磁盘:/dev/sda(系统安装要的swap和/目录)
/dev/sdb(用作drbd使用)
两台主机:ip 10.0.17.155
10.0.17.156
第一步:定义host:
[root@mysql-n1 ~]# vi /etc/hosts
10.0.17.155 mysql-n1
10.0.17.156 mysql-n2
第二步:创建磁盘(前提有这样一块硬盘,由于我是在vm上面做的实验,所以多模拟出来了
一块硬盘,linux认盘,就是根据盘的个数,自己辨别,第一块就是sda,第二块就是sdb)
[root@mysql-n1 ~]# fdisk -l
Disk /dev/sda: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 262 5221 39841200 83 Linux
/dev/sda2 1 261 2096451 82 Linux swap / Solaris
Partition table entries are not in disk order
Disk /dev/sdb: 21.4 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
[root@mysql-n1 ~]# fdisk /dev/sdb
依次输入:n-->p-->1 回车-->回车-->w完成
The number of cylinders for this disk is set to 2610.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-2610, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-2610, default 2610):
Using default value 2610
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@mysql-n1 ~]# fdisk -l
Disk /dev/sda: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 262 5221 39841200 83 Linux
/dev/sda2 1 261 2096451 82 Linux swap / Solaris
Partition table entries are not in disk order
Disk /dev/sdb: 21.4 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 1 2610 20964793+ 83 Linux
第三步:安装drbd
[root@mysql-n1 ~]# yum -y install kmod-drbd83 drbd83
第四步:配置drbd(我只配置/etc/drbd.conf),把配置好的scp到另一台服务器上
global { usage-count no; }
common { syncer { rate 200M; } }
resource r0 {
protocol C;
net {
cram-hmac-alg sha1;
shared-secret "MySQL_HA";
}
disk{
on-io-error detach;
fencing resource-only;
}
startup{
wfc-timeout 120;
degr-wfc-timeout 120;
}
on mysql-n1 {
device /dev/drbd0;
disk /dev/sdb1;
address 10.0.17.155:7898;
meta-disk internal;
}
on mysql-n2 {
device /dev/drbd0;
disk /dev/sdb1;
address 10.0.17.156:7898;
meta-disk internal;
}
}
第五步:DRBD创建元数据库信息:
[root@mysql-n1 ~]# drbdadm create-md all
Writing meta data...
initializing activity log
NOT initialized bitmap
New drbd meta data block successfully created.
[root@mysql-n2 ~]# drbdadm create-md all
Writing meta data...
initializing activity log
NOT initialized bitmap
New drbd meta data block successfully created.
第六步:启动DRBD
[root@mysql-n1 ~]# /etc/init.d/drbd start
第七步:设置primary节点&mkfs
[root@mysql-n1 ~]# drbdadm primary all(报错,执行下面操作)
0: State change failed: (-2) Need access to UpToDate data
Command 'drbdsetup 0 primary' terminated with exit code 17
[root@mysql-n1 ~]# drbdadm -- --overwrite-data-of-peer primary all
[root@mysql-n1 ~]# mkfs.ext3 /dev/drbd0
第八步:查看drbd的状态
[root@mysql-n1 ~]# cat /proc/drbd
version: 8.3.13 (api:88/proto:86-96)
GIT-hash: 83ca112086600faacab2f157bc5a9324f7bd7f77 build by
mockbuild@builder10.centos.org, 2012-05-07 11:56:36
0: cs:SyncSource ro:Primary/Secondary ds:UpToDate/Inconsistent C r-----
ns:5043196 nr:0 dw:0 dr:5051264 al:0 bm:307 lo:1 pe:5 ua:64 ap:0 ep:1 wo:b
oos:15921556
[===>................] sync'ed: 24.1% (15548/20472)M
finish: 0:02:02 speed: 129,304 (126,064) K/sec
其中:ro是角色信息:Primary/Secondary(代表这个是主节点)
Secondary/Primary(代表这个是副节点)
ds是磁盘状态:UpToDate/Inconsistent(正在同步,数据还没有一致)
UpToDate/UpToDate (同步完成,数据一致)
ns是网络传输的数据包:以K为字节
dw是磁盘写操作
dr是磁盘读操作
第九步:挂载DRBD分区到/data目录下
[root@mysql-n1 ~]# mkdir /data
[root@mysql-n1 ~]# mount /dev/drbd0 /data
[root@mysql-n1 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 37G 4.5G 31G 13% /
tmpfs 502M 0 502M 0% /dev/shm
/dev/drbd0 20G 173M 19G 1% /data
注意:DRBD的英文全称就是Distributed Replicated Block Device(分布式块设备复制),
个人认为,说白了就是对/dev/sdb1的复制。而且Secondary节点的/dev/drbd0是不能进行挂
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