DRBD以其開源，簡單，高效，性能不俗為廣大運(yùn)維者們所青睞。主要功能是在不同節(jié)點(diǎn)上兩個(gè)相同大小的設(shè)備塊級別之間的數(shù)據(jù)同步鏡像。drbd是由內(nèi)核模塊和相關(guān)腳本而構(gòu)成，用以構(gòu)建高可用性的集群。本文主要描述其安裝方式，供大家參考。

有關(guān)DRBD的特性，功能及其相關(guān)基礎(chǔ)知識，大家可以參考： DRBD原理及特性概述

一、演示環(huán)境

OS版本：CentOS release 6.5 (Final) orasrv1: 192.168.21.10 orasrv2: 192.168.21.13 DRBD版本Version: 8.3.15 (api:88)

二、yum方式安裝drbd(兩節(jié)點(diǎn))

1、以下通過yum方式安裝

配置epel源，可以從這里下載，或者直接用wget方式獲取 http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm # wget http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm # rpm -Uvh epel-release-6-8.noarch.rpm # yum -y install drbd83 kmod-drbd83 # modprobe drbd # lsmod |grep drbd drbd 345363 0

2、配置部分，請參考第三點(diǎn)編譯方式安裝drbd之第4小點(diǎn)后續(xù)部分

###注，通過yum方式安裝時(shí)，drbd配置文件目錄有所不同 ###drbd.conf文件放置到/etc目錄下，其余的2個(gè)配置文件存放到/etc/drbd.d目錄下

三、編譯方式安裝drbd

1、安裝用戶空間工具(兩節(jié)點(diǎn))

# yum -y install kernel-devel kernel-headers flex gcc # pwd usr/local/src ###drbd壓縮文件存放位置 # tar -xvf drbd-8.3.15.tar.gz # cd drbd-8.3.15 # ./configure --prefix=/usr/local/drbd --with-km # make KDIR=/usr/src/kernels/2.6.32-431.el6.x86_64/ # make install # ls /usr/local/drbd/ ##查看安裝后的文件 etc lib sbin share var# cp /usr/local/drbd/etc/rc.d/init.d/drbd /etc/init.d/drbd # chkconfig --add drbd # chkconfig drbd on

2、安裝drbd模塊(兩節(jié)點(diǎn))

# cd /usr/local/src/drbd-8.3.15/drbd # make clean # make KDIR=/usr/src/kernels/2.6.32-431.el6.x86_64/ # cp drbd.ko /lib/modules/`uname -r`/kernel/lib/ # depmod # modprobe drbd ###加載drbd模塊到Linux內(nèi)核 注：/usr/src/kernels/2.6.18-274.18.1.el5-i686/這個(gè)內(nèi)核源碼樹路徑需要根據(jù)自己的系統(tǒng)修改。

3、驗(yàn)證drbd內(nèi)核加載(兩節(jié)點(diǎn))

# lsmod |grep drbd drbd 345363 0

4、配置系統(tǒng)磁盤(兩節(jié)點(diǎn))

### Author : Leshami ### Blog ： http://blog.csdn.net/leshami ###本示例種為當(dāng)前2節(jié)點(diǎn)單獨(dú)分配了/dev/sdb磁盤，以下操作在2節(jié)點(diǎn)完成 # fdisk /dev/sdb ###依次輸入n，p，1，回車(enter)，回車(enter)，w # partprobe ###如果依舊無法看到分區(qū)，請reboot以及查找原因 # fdisk -l /dev/sdb

5、配置drbd.conf及global_common.conf(兩節(jié)點(diǎn))

# mv /usr/local/drbd/etc/drbd.conf /usr/local/drbd/etc/drbd.conf.bk # cp /usr/local/src/drbd-8.3.15/scripts/drbd.conf /usr/local/drbd/etc/drbd.conf# more /usr/local/drbd/etc/drbd.conf ###查看drbd.conf應(yīng)包含下列include內(nèi)容 # You can find an example in /usr/share/doc/drbd.../drbd.conf.example include "drbd.d/global_common.conf"; include "drbd.d/*.res";# mv /usr/local/drbd/etc/drbd.d/global_common.conf /usr/local/drbd/etc/drbd.d/global_common.conf.bk # vi /usr/local/drbd/etc/drbd.d/global_common.conf ###global_common.conf可以參考drbd.conf.example global {usage-count yes;# minor-count dialog-refresh disable-ip-verification }common {protocol C;handlers {}startup {wfc-timeout 0; degr-wfc-timeout 120;}disk {on-io-error detach;}net {# sndbuf-size rcvbuf-size timeout connect-int ping-int ping-timeout max-buffers# max-epoch-size ko-count allow-two-primaries cram-hmac-alg shared-secret# after-sb-0pri after-sb-1pri after-sb-2pri data-integrity-alg no-tcp-corkcram-hmac-alg sha1;shared-secret "MySQL-HA"; }syncer {# rate after al-extents use-rle cpu-mask verify-alg csums-algrate 35M;} }###配置資源文件redisk.res # vi /usr/local/drbd/etc/drbd.d/redisk.res resource redisk {on orasrv1.xlk.com {device /dev/drbd0;disk /dev/sdb1;address 192.168.21.10:7789;meta-disk internal;}on orasrv2.xlk.com {device /dev/drbd0;disk /dev/sdb1;address 192.168.21.13:7789;meta-disk internal;} }###也可以通過copy方式直接將配置文件copy到節(jié)點(diǎn)2，則無需單獨(dú)配置2個(gè)配置文件，如下： # scp /usr/local/drbd/etc/drbd.d/* 192.168.21.13:/usr/local/drbd/etc/drbd.d/ # scp /usr/local/drbd/etc/drbd.conf 192.168.21.13:/usr/local/drbd/etc/

6、創(chuàng)建device metadata(兩節(jié)點(diǎn)執(zhí)行)

# drbdadm create-md redisk Writing meta data... initializing activity log NOT initialized bitmap New drbd meta data block successfully created.[root@orasrv1 drbd.d]# drbdadm up redisk [root@orasrv1 drbd.d]# /etc/init.d/drbd status drbd driver loaded OK; device status: version: 8.3.15 (api:88/proto:86-97) GIT-hash: 0ce4d235fc02b5c53c1c52c53433d11a694eab8c build by root@orasrv1.xlk.com, 2015-10-31 09:16:05 m:res cs ro ds p mounted fstype 0:redisk WFConnection Secondary/Unknown Inconsistent/DUnknown C

5、設(shè)置Primary節(jié)點(diǎn)(主節(jié)點(diǎn))

以下操作僅在節(jié)點(diǎn)1(orasrv1)執(zhí)行 # drbdadm primary --force redisk 0: State change failed: (-2) Need access to UpToDate data Command 'drbdsetup 0 primary' terminated with exit code 17 # drbdadm -- --overwrite-data-of-peer primary redisk # mkfs.ext3 /dev/drbd0 # mkdir /data # mount /dev/drbd0 /data # df -h |grep data /dev/drbd0 2.0G 36M 1.9G 2% /data###在第二個(gè)節(jié)點(diǎn)上創(chuàng)建/data目錄 # mkdir /data ###查看drbd狀態(tài)信息： #cat /proc/drbd

四、DRBD數(shù)據(jù)鏡像功能測試

###首先在主節(jié)點(diǎn)完成如下操作 # cp -R /usr/local/drbd /data # ls /data/drbd etc lib sbin share var # du -sh /data/drbd 324K /data/drbd# umount /data # drbdadm secondary redisk # cat /proc/drbd version: 8.3.15 (api:88/proto:86-97) GIT-hash: 0ce4d235fc02b5c53c1c52c53433d11a694eab8c build by root@orasrv1.xlk.com, 2015-10-31 10:58:130: cs:Connected ro:Secondary/Secondary ds:UpToDate/UpToDate C r-----ns:1044700 nr:0 dw:33780 dr:1045517 al:3 bm:64 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:0###在備用節(jié)點(diǎn)完成如下操作 # drbdadm primary redisk # cat /proc/drbd version: 8.3.15 (api:88/proto:86-97) GIT-hash: 0ce4d235fc02b5c53c1c52c53433d11a694eab8c build by root@orasrv2.xlk.com, 2015-10-31 10:59:260: cs:Connected ro:Primary/Secondary ds:UpToDate/UpToDate C r-----ns:0 nr:1044700 dw:1044700 dr:672 al:0 bm:64 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:0 # mount /dev/drbd0 /data # du -sh /data/drbd ###兩節(jié)點(diǎn)數(shù)據(jù)目錄及大小完全一致 324K /data/drbd

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