基于Ubuntu 14.04 的DRBD配置

1.安装DRBD软件：

root@controller1:/# apt-get install -y --force-yes drbd8-utilsReading package lists... DoneBuilding dependency tree....   

查看drbd状态

root@controller1:/# service drbd statusdrbd driver loaded OK; device status:version: 8.4.3 (api:1/proto:86-101)srcversion: F97798065516C94BE0F27DC m:res  cs  ro  ds  p  mounted  fstype

drbd属于两节点，需要在另外一节点安装一样的软件

2.配置Drbd资源

root@controller1:/# cd /etc/drbd.d/root@controller1:/etc/drbd.d# lsglobal_common.conf  mysql.res

进入drbd配置目录，可以看到global_common.conf配置文件，上述mysql.res为笔者后来创建文件

创建Drbd设备资源配置文件，创建并且编辑文件

root@controller1:/etc/drbd.d# touch mysql.resroot@controller1:/etc/drbd.d# vim mysql.res 

资源配置格式，如下文实际文件

resource mysql {    device minor 0;    disk "/dev/sdb5";    meta-disk internal;    on controller1 {        address ipv4 192.168.2.11:7700;    }    on controller2 {        address ipv4 192.168.2.12:7700;    }}

resource 资源名 {    device minor 0;    设备号      disk "/dev/sdb5";  底层实际使用的设备，两个节点可以有差异    meta-disk internal;节点信息，controller1，controller2为两节点hostname    on controller1 {        address ipv4 192.168.2.11:7700;    }    on controller2 {        address ipv4 192.168.2.12:7700;    }}

3.启动设备资源

当两个节点的配置文件都创建完毕后

root@controller1:/etc/drbd.d# drbdadm create-md mysqlYou want me to create a v08 style flexible-size internal meta data block.There appears to be a v08 flexible-size internal meta data blockalready in place on /dev/sdb5 at byte offset 5368705024Do you really want to overwrite the existing v08 meta-data?[need to type 'yes' to confirm] yesWriting meta data...md_offset 5368705024al_offset 5368672256bm_offset 5368508416Found xfs filesystem     5242684 kB data area apparently used     5242684 kB left usable by current configurationEven though it looks like this would place the new meta data intounused space, you still need to confirm, as this is only a guess.Do you want to proceed?[need to type 'yes' to confirm] yesinitializing activity logNOT initializing bitmapNew drbd meta data block successfully created.

启用设备

root@controller1:/etc/drbd.d# drbdadm up mysql root@controller1:/etc/drbd.d# drbd-overview   0:mysql/0  WFConnection Secondary/Unknown Inconsistent/DUnknown C r----s

强制为主节点，只需要在一个节点上操作

root@controller1:~# drbdadm -- --force primary mysqlroot@controller1:~# drbd-overview   0:mysql/0  WFConnection Primary/Unknown UpToDate/Outdated C r----s

drbd-overview 可以查看drbd设备状态，另外drbd设备符

root@controller1:/dev/drbd# lsby-disk  by-resroot@controller1:/dev/drbd# ls -al by-disk/total 0drwxr-xr-x 2 root root 60 Jul 29 13:20 .drwxr-xr-x 4 root root 80 Jul 29 13:20 ..lrwxrwxrwx 1 root root 11 Jul 29 13:22 sdb5 -> ../../drbd0root@controller1:/dev/drbd# ls -al by-res/total 0drwxr-xr-x 3 root root 60 Jul 29 13:20 .drwxr-xr-x 4 root root 80 Jul 29 13:20 ..drwxr-xr-x 2 root root 60 Jul 29 13:20 mysqlroot@controller1:/dev/drbd# ls -al by-res/mysql/total 0drwxr-xr-x 2 root root 60 Jul 29 13:20 .drwxr-xr-x 3 root root 60 Jul 29 13:20 ..lrwxrwxrwx 1 root root 14 Jul 29 13:22 0 -> ../../../drbd0

实际的设备/dev/drbd0   设备号0为配置文件中

拷贝文件至drbd设备

root@controller1:/# mount /dev/drbd0 /mnt/root@controller1:/# cp -prf /var/lib/mysql/* /mnt/root@controller1:/# drbd-overview   0:mysql/0  WFConnection Primary/Unknown UpToDate/Outdated C r----s /mnt xfs 5.0G 112M 4.9G 3%

此时另外一个节点处于outdated状态，只需要在另外节点创建并启用，两者即会同步

root@controller2:~# drbdadm create-md mysql You want me to create a v08 style flexible-size internal meta data block.There appears to be a v08 flexible-size internal meta data blockalready in place on /dev/sda5 at byte offset 5368705024Do you really want to overwrite the existing v08 meta-data?[need to type 'yes' to confirm] yes.......New drbd meta data block successfully created.root@controller2:~# drbd-overview   0:mysql/0  Unconfigured . . . . root@controller2:~# drbdadm up mysql root@controller2:~# drbd-overview   0:mysql/0  SyncTarget Secondary/Primary Inconsistent/UpToDate C r-----         [>....................] sync'ed:  0.7% (5088/5116)Mfinish: 0:02:42 speed: 31,744 (31,744) want: 30,800 K/sec

4.Drbd脑裂行为解决

如上我们看到节点2上数据处于standalone状态，即发生了脑裂。【因为该环境之前本身就有数据】

此时可以通过，使得次节点数据不可靠，让其主动同主节点同步

root@controller2:~# drbdadm secondary mysqlroot@controller2:~# drbdadm  -- --discard-my-data connect mysqlroot@controller1:/# drbdadm connect mysql

如果此种情况节点2，仍然是StandAlone，则可以完全重建节点2。

root@controller2:~# drbdadm detach mysql root@controller2:~# drbdadm down mysql root@controller2:~# drbdadm create-md mysql You want me to create a v08 style flexible-size internal meta data block.There appears to be a v08 flexible-size internal meta data blockalready in place on /dev/sda5 at byte offset 5368705024Do you really want to overwrite the existing v08 meta-data?[need to type 'yes' to confirm]........root@controller2:~# drbdadm up mysql root@controller2:~# drbd-overview   0:mysql/0  SyncTarget Secondary/Primary Inconsistent/UpToDate C r-----         [>....................] sync'ed:  1.5% (5044/5116)Mfinish: 0:01:07 speed: 75,776 (75,776) want: 91,600 K/sec

经过一段时间同步后，同步完成。

root@controller1:/# drbd-overview   0:mysql/0  SyncSource Primary/Secondary UpToDate/Inconsistent C r----- /mnt xfs 5.0G 112M 4.9G 3%         [================>...] sync'ed: 86.2% (708/5116)Mfinish: 0:00:13 speed: 54,484 (54,420) K/sec

两个节点同步时，一个状态为SyncSource一个状态为SyncTarget

root@controller1:/# drbd-overview   0:mysql/0  Connected Primary/Secondary UpToDate/UpToDate C r----- /mnt xfs 5.0G 112M 4.9G 3%

同步完成状态为Connected