CentOS 6.3下DRBD安装配置笔记

-----------------------闲 扯-------------------------------

最近准备更新点负载均衡高可用的文档,所以把之前一直想攻克的DRBD今天抽空给搞定了。

DRBD(Distributed Replicated Block Device) 我们可以理解为它其实就是个网络RAID-1,两台服务器间就算某台因断电或者宕机也不会对数据有任何影响,而真正的热切换可以通过Heartbeat方案解决,不需要人工干预。

例如:DRBD+Heartbeat+Mysql进行主从结构分离,作为DRBD+HeartBeat+NFS的备份存储解决方案。

--------------------废话不多说,开搞---------------------------

系统版本:CentOS6.3 x64(内核2.6.32)

DRBD:DRBD-8.4.3

Primary: 192.168.7.88(drbd1.example.com)

Secondary: 192.168.7.89 (drbd2.example.com)

(Primary)为仅主服务器端配置

(Secondary)为仅从服务器端配置

(Primary,Secondary)为主服务器端从服务器端共同配置

一.准备环境:(Primary,Secondary)

1.关闭iptables和SELINUX,避免安装过程中报错。

# service iptables stop

# setenforce 0

# vi /etc/sysconfig/selinux

---------------

SELINUX=disabled

---------------

2.设置hosts文件

# vi /etc/hosts

-----------------

192.168.7.88 drbd1.example.com drbd1

192.168.7.89 drbd2.example.com drbd2

-----------------

3.在两台虚拟机分别添加一块2G硬盘sdb作为DRBD,分别分区为sdb1,大小2G,并在本地系统创建/data目录,不做挂载操作。

# fdisk /dev/sdb

----------------

n-p-1-1-"+1G"-w

----------------

# mkdir /data

4.时间同步:

# ntpdate -u asia.pool.ntp.org

5.更改主机名:

(Primary)

# vi /etc/sysconfig/network

----------------

HOSTNAME=server.example.com

----------------

(Secondary)

# vi /etc/sysconfig/network

----------------

HOSTNAME=client.example.com

----------------

二.DRBD的安装配置:

1.安装依赖包:(Primary,Secondary)

# yum install gcc gcc-c++ make glibc flex kernel-devel kernel-headers

2.安装DRBD:(Primary,Secondary)

# wget

# tar zxvf drbd-8.4.3.tar.gz

# cd drbd-8.4.3

# ./configure --prefix=/usr/local/drbd --with-km

# make KDIR=/usr/src/kernels/2.6.32-279.el6.x86_64/

# make install

# mkdir -p /usr/local/drbd/var/run/drbd

# cp /usr/local/drbd/etc/rc.d/init.d/drbd /etc/rc.d/init.d

# chkconfig --add drbd

# chkconfig drbd on

加载DRBD模块:

# modprobe drbd

查看DRBD模块是否加载到内核:

# lsmod |grep drbd

3.参数配置:(Primary,Secondary)

# vi /usr/local/drbd/etc/drbd.conf

清空文件内容,并添加如下配置:

---------------

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 30M;}

on drbd1.example.com{

device /dev/drbd0;

disk /dev/sdb1;

address 192.168.7.88:7788;

meta-disk internal;

}

on drbd2.example.com{

device /dev/drbd0;

disk /dev/sdb1;

address 192.168.7.89:7788;

meta-disk internal;

}

}

---------------

4.创建DRBD设备并激活ro资源:(Primary,Secondary)

# 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

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.

?

nu=716310175600466686&ru=15741444353112217792&rs=1085704704

* If you wish to opt out entirely, simply enter 'no'.

* To continue, just press [RETURN]

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.

----------------

5.启动DRBD服务:(Primary,Secondary)

# service drbd start

注:需要主从共同启动方能生效

6。查看状态:(Primary,Secondary)

# cat /proc/drbd

----------------

# 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

----------------

# 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

----------------

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

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