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CentOS6.5下DRBD+HeartBeat+NFS配置(一)

 

DRBD配置

Distributed Replicated Block Device(DRBD)是一个用软件实现的、无共享的、服务器之间镜像块设备内容的存储复制解决方案。
 
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。
 
一、环境描述
系统版本:centos6.6 x64(内核2.6.32-504.16.2.el6.x86_64)
DRBD版本:DRBD-8.4.3
 
node1(主节点)IP: 192.168.0.191 主机名:drbd1.corp.com
node2(从节点)IP: 192.168.0.192 主机名:drbd2.corp.com
 
(node1) 仅为主节点配置
(node2) 仅为从节点配置
(node1,node2) 为主从节点共同配置
 
二、安装前准备:(node1,node2)
1、关闭iptables和SELINUX,避免安装过程中报错。

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# service iptables stop
# chkconfig iptables off
# setenforce 0
# vi /etc/selinux/config
---------------
SELINUX=disabled
---------------

2、配置hosts文件

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# vi /etc/hosts
192.168.0.191  drbd1.corp.com
192.168.0.192  drbd2.corp.com

3、在两台虚拟机分别添加一块10G硬盘分区作为DRBD设备磁盘,分别都为sdb1,大小10G,并在本地系统创建/store目录,不做挂载操作。

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# fdisk /dev/sdb
----------------
n-p-1-1-"+10G"-w
----------------
# mkdir /store

4、时间同步:

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# ntpdate -u asia.pool.ntp.org

三、DRBD的安装配置:
1、安装依赖包:(node1,node2)

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

2、安装DRBD:(node1,node2)

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# wget http://oss.linbit.com/drbd/8.4/drbd-8.4.3.tar.gz
# 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/2.6.32-504.16.2.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

3、加载DRBD模块:(node1,node2)

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# modprobe drbd

查看DRBD模块是否加载到内核:

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# lsmod |grep drbd
drbd 310172 4
libcrc32c 1246 1 drbd

4、参数配置:(node1,node2)

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

清空文件内容,并添加如下配置:

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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 200M;}
 
on drbd1.corp.com{
device /dev/drbd0;
disk /dev/sdb1;
address 192.168.0.191:7788;
meta-disk internal;
}
on drbd2.corp.com{
device /dev/drbd0;
disk /dev/sdb1;
address 192.168.0.192:7788;
meta-disk internal;
}
}

注:请修改上面配置中的主机名、IP、和disk为自己的具体配置
 
5、创建DRBD设备并激活r0资源:(node1,node2)

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# 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]
 
success

再次输入该命令:

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# 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.

6、启动DRBD服务:(node1,node2)

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# service drbd start

注:需要主从共同启动方能生效
 
7、查看状态:(node1,node2)

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# 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.corp.com, 2015-05-12 21:05:41
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,显示的状态内容为“Inconsistent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。
 
8、将drbd1.example.com主机配置为主节点:(node1)

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# drbdsetup /dev/drbd0 primary --force

分别查看主从DRBD状态:
(node1)

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# 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.corp.com, 2015-05-12 21:05:41
m:res  cs         ro                 ds                 p  mounted     fstype
0:r0   Connected  Primary/Secondary  UpToDate/UpToDate  C

(node2)

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# service drbd status
drbd driver loaded OK; device status:
version: 8.4.3 (api:1/proto:86-101)
GIT-hash: 89a294209144b68adb3ee85a73221f964d3ee515 build by root@drbd2.corp.com, 2015-05-12 21:05:46
m:res  cs         ro                 ds                 p  mounted     fstype
0:r0   Connected  Secondary/Primary  UpToDate/UpToDate  C

ro在主从服务器上分别显示 Primary/Secondary和Secondary/Primary
ds显示UpToDate/UpToDate
表示主从配置成功。
 
9、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/store

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# mkfs.ext4 /dev/drbd0
# mount /dev/drbd0 /store

注:Secondary节点上不允许对DRBD设备进行任何操作,包括挂载;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,并自动挂载DRBD继续工作。
 
成功挂载后的DRBD状态:(node1)

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# 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.corp.com, 2015-05-12 21:05:41
m:res  cs         ro                 ds                 p  mounted     fstype
0:r0   Connected  Primary/Secondary  UpToDate/UpToDate  C  /store      ext4

原文链接:CentOS6.5下DRBD+HeartBeat+NFS配置(一),转载请注明来源!

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