Centos6下DRBD的安裝配置

Centos6下DRBD的安裝配置
導讀Distributed Replicated Block Device(DRBD)是一個用軟體實現的、無共用的、伺服器之間鏡像塊裝置內容的儲存複製解決方案。資料鏡像：即時、透明、同步（所有伺服器都成功後返回）、非同步（本機伺服器成功後返回）。DRBD的核心功能通過Linux的核心實現，最接近系統的IO棧，但它不能神奇地添加上層的功能比如檢測到EXT3檔案系統的崩潰。DRBD的位置處於檔案系統以下，比檔案系統更加靠近作業系統核心及IO棧。

一、安裝環境說明

系統版本：CentOS6.5DRBD版本：DRBD-8.4.3node1:  192.168.7.88（drbd1)node2:  192.168.7.89 (drbd2)(node1)為僅主節點配置(node2)為僅從節點配置(node1,node2)為主從節點共同配置

二、準備環境：(node1,node2)

1.關閉iptables和SELINUX，避免安裝過程中報錯

service iptables stop            //關閉iptablessetenforcing 0                 //暫時關閉selinuxsed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/sysconfig/selinux    //永久關閉selinux

2.設定hosts檔案

vi /etc/hosts127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4::1 localhost localhost.localdomain localhost6 localhost6.localdomain6192.168.7.88 drbd1192.168.7.89 drbd2

3.在兩台虛擬機器上添加一塊2G硬碟sdb作為DRBD，分別分區為sdb1，大小1G，並在本地系統建立/data目錄，不做掛載操作。

fdisk /dev/sdb----------------n-p-1-斷行符號-"+1G"-wq----------------mkdir /data

4.時間同步：

ntpdate -u asia.pool.ntp.org

三、DRBD的安裝部署

1.安裝依賴包：(node1,node2)

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

2.安裝DRBD：(node1,node2)

wget http://oss.linbit.com/drbd/8.4/drbd-8.4.3.tar.gztar zxvf drbd-8.4.3.tar.gzcd drbd-8.4.3./configure --prefix=/usr/local/drbd --with-kmmake && make installmkdir -p /usr/local/drbd/var/run/drbdcp /usr/local/drbd/etc/rc.d/init.d/drbd /etc/rc.d/init.dchkconfig --add drbdchkconfig drbd on載入DRBD模組:modprobe drbd查看DRBD模組是否載入到核心：lsmod |grep drbd

四、DRBD的配置

1.參數配置：(node1,node2)

vim /usr/local/drbd/etc/drbd.conf清空裡面的配置，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 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;}}

2.建立DRBD裝置並啟用r0資源：(node1,node2)

mknod /dev/drbd0 b 147 0drbdadm create-md r0等待片刻，顯示success表示drbd塊建立成功----------------Writing meta data...initializing activity logNOT initializing bitmapNew drbd meta data block successfully created. --== Creating metadata ==--As with nodes, we count the total number of devices mirrored by DRBDat http://usage.drbd.org.The counter works anonymously. It creates a random number to identifythe device and sends that random number, along with the kernel andDRBD 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] //出現[RETURN]按斷行符號success----------------再次輸入該命令：# drbdadm create-md r0成功啟用r0----------------[need to type 'yes' to confirm] yesWriting meta data...initializing activity logNOT initializing bitmapNew drbd meta data block successfully created.

3.啟動DRBD服務：(node1,node2)

service drbd start

註：需要主從共同啟動方能生效
4.查看狀態：(node1,node2)

cat /proc/drbdversion: 8.4.3 (api:1/proto:86-101)GIT-hash: 89a294209144b68adb3ee85a73221f964d3ee515 build by root@drbd1.example.com,2013-05-27 20:45:190: 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 statusdrbd 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 20:45:19m:res cs ro ds p mounted fstype0:r0 Connected Secondary/Secondary Inconsistent/Inconsistent C

註：這裡ro:Secondary/Secondary表示兩台主機的狀態都是備機狀態，ds是磁碟狀態，顯示的狀態內容為“不一致”，這是因為DRBD無法判斷哪一方為主機，應以哪一方的磁碟資料作為標準。

5.將drbd1主機配置為主節點：(node1)

drbdsetup /dev/drbd0 primary --force

分別查看主從DRBD狀態：

(node1)service drbd statusdrbd 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 20:45:19m:res cs ro ds p mounted fstype0:r0 Connected Primary/Secondary UpToDate/UpToDate C(node2)service drbd statusdrbd driver loaded OK; device status:version: 8.4.3 (api:1/proto:86-101)GIT-hash: 89a294209144b68adb3ee85a73221f964d3ee515 build by root@drbd2.example.com,2013-05-27 20:49:06m:res cs ro ds p mounted fstype0:r0 Connected Secondary/PrimaryUpToDate/UpToDateC

註：ro在主從伺服器上分別顯示 Primary/Secondary和Secondary/Primary ds顯示UpToDate/UpToDate表示主從配置成功。
6.掛載DRBD：(node1)

從剛才的狀態上看到mounted和fstype參數為空白，所以我們這步開始掛載DRBD到系統目錄mkfs.ext4 /dev/drbd0mount /dev/drbd0 /data註：Secondary節點上不允許對DRBD裝置進行任何操作，包括唯讀，所有的讀寫操作只能在Primary節點上進行，只有當Primary節點掛掉時，Secondary節點才能提升為Primary節點繼續工作。

五、類比故障

(node1)

cd /datatouch 1 2 3 4 5cd ..umount /datadrbdsetup /dev/drbd0 secondary

註：這裡實際生產環境若DRBD1宕機，在DRBD2狀態資訊中ro的值會顯示為Secondary/Unknown,只需要進行DRBD提權操作即可。

(node2)

drbdsetup /dev/drbd0 primarymount /dev/drbd0 /datacd /datatouch 6 7 8 9 10ls--------------1 10 2 3 4 5 6 7 8 9 lost+found

查看(node1)(node2)DRBD狀態：

(node2)service drbd statusdrbd driver loaded OK; device status:version: 8.4.3 (api:1/proto:86-101)GIT-hash: 89a294209144b68adb3ee85a73221f964d3ee515 build by root@drbd2.example.com,2013-05-27 20:49:06m:res  cs         ro                 ds                 p  mounted  fstype0:r0   Connected  Primary/Secondary  UpToDate/UpToDate  C  /data    ext4(node1)service drbd statusdrbd 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 20:45:19m:res  cs         ro                 ds                 p  mounted  fstype0:r0   Connected  Secondary/Primary  UpToDate/UpToDate  C

原文來自：http://www.showerlee.com/archives/295

轉載地址：http://www.linuxprobe.com/centos6-drdb-setup-instal.htm