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DRBD 3 nodes howto (Beta Version)

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DRBD for 3 nodes howto (Beta Version)
By Syed Asim Abbas
This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Date : 18-Nov-2009


We have installed 3 nodes drbd, but it is not reliable as two DRBD server setup. We are facing some issues after the installation.

[root@drbd1 ~]# yum install drbd83 kmod-drbd83
[root@drbd2 ~]# yum install drbd83 kmod-drb83
[root@drbd3 ~]# yum install drbd83 kmod-drb83


Insert the lines(for first 2 nodes )

vi /etc/drbd.conf
-----------------------

global { usage-count yes; }
common { syncer { rate 10M; } }
resource r0 {
protocol C;
net {
}
on drbd1.isb.ots.com {
device    /dev/drbd0;
disk      /dev/hda5;
address   192.168.1.224:7789;
flexible-meta-disk  internal;
}
on drbd2.isb.ots.com {
device    /dev/drbd0;
disk      /dev/hda5;
address   192.168.1.223:7789;
flexible-meta-disk  internal;
}


[root@drbd1 ~]# modprobe drbd

[root@drbd2 ~]# modprobe drbd



[root@drbd2 ~]# vi /etc/ha.d/haresources


[root@drbd1 ~]# drbdadm create-md r0


[root@drbd2 ~]# drbdadm create-md r0


HEAR BEAT Setup for 2 nodes (drbd1 , drbd 2)
--------------------------------------------


[root@drbd1 ha.d]# vi ha.cf


logfacility     local0
keepalive 2
#deadtime 30 # USE THIS!!!
deadtime 10
bcast   eth2
#serial /dev/ttyS0
#baud 19200
auto_failback off
node drbd1.isb.ots.com  drbd2.isb.ots.com




[root@drbd1 ha.d]# vi /etc/ha.d/haresources


drbd1.isb.ots.com IPaddr::10.0.0.5/27/eth0 drbddisk::r0 Filesystem::/dev/drbd0::/data::ext3


SAME configuration on node 2 with different name and IP




root@drbd1 ~]# cat /proc/drbd
version: 8.3.2 (api:88/proto:86-90)
GIT-hash: dd7985327f146f33b86d4bff5ca8c94234ce840e build by This e-mail address is being protected from spambots. You need JavaScript enabled to view it .local, 2009-08-29 14:02:24




[root@drbd2 ~]# cat /proc/drbd
version: 8.3.6 (api:88/proto:86-91)
GIT-hash: f3606c47cc6fcf6b3f086e425cb34af8b7a81bbf build by This e-mail address is being protected from spambots. You need JavaScript enabled to view it , 2009-11-10 08:57:54






[root@drbd1 ~]# /etc/init.d/drbd start
Starting DRBD resources: [ d(r0) s(r0) n(r0) ]....



[root@drbd1 ~]# cat /proc/drbd
version: 8.3.2 (api:88/proto:86-90)
GIT-hash: dd7985327f146f33b86d4bff5ca8c94234ce840e build by This e-mail address is being protected from spambots. You need JavaScript enabled to view it .local, 2009-08-29 14:02:24
0: cs:WFConnection ro:Secondary/Unknown ds:Inconsistent/DUnknown 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:b oos:200736




[root@drbd2 ~]# /etc/init.d/drbd start

[root@drbd2 ~]# cat /proc/drbd
version: 8.3.6 (api:88/proto:86-91)
GIT-hash: f3606c47cc6fcf6b3f086e425cb34af8b7a81bbf build by This e-mail address is being protected from spambots. You need JavaScript enabled to view it , 2009-11-10 08:57:54
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:b oos:200736







[root@drbd1 ~]# drbdadm  -- --overwrite-data-of-peer primary  r0


[root@drbd1 ~]# cat /proc/drbd
version: 8.3.2 (api:88/proto:86-90)
GIT-hash: dd7985327f146f33b86d4bff5ca8c94234ce840e build by This e-mail address is being protected from spambots. You need JavaScript enabled to view it .local, 2009-08-29 14:02:24
0: cs:SyncSource ro:Primary/Secondary ds:UpToDate/Inconsistent C r----
ns:70656 nr:0 dw:0 dr:70656 al:0 bm:4 lo:0 pe:100 ua:0 ap:0 ep:1 wo:b oos:133280
[======>.............] sync'ed: 36.0% (133280/200736)K
finish: 0:00:15 speed: 8,432 (8,432) K/sec




For Node 3
-------------

Now add 3rd node resource on /etc/drbd.conf




}
resource r1 {
protocol A;
syncer {
after r0;
rate 12M;
al-extents 513;
}
net {
}
stacked-on-top-of r0 {
device /dev/drbd3;
address 192.168.1.224:7788; # Virtul of 2 node DRBD clusterIP provided by Heartbeat
}

on drbd3.isb.ots.com {
device     /dev/drbd3;
disk       /dev/hda5;
address    192.168.1.225:7788; # Public IP of the backup node
meta-disk  internal;
}
}




[root@drbd1 ~]# drbdadm --stacked create-md r1


[root@drbd1 ~]# drbdadm --stacked up r1



[root@drbd1 ~]# drbdadm --stacked -- --overwrite-data-of-peer primary  r1

[root@drbd3 ~]# drbdadm create-md r1


root@drbd3 ~]# cat /proc/drbd
version: 8.3.2 (api:88/proto:86-90)
GIT-hash: dd7985327f146f33b86d4bff5ca8c94234ce840e build by This e-mail address is being protected from spambots. You need JavaScript enabled to view it .local, 2009-08-29 14:02:24

3: cs:SyncTarget ro:Secondary/Primary ds:Inconsistent/UpToDate A r----
ns:0 nr:40524 dw:37720 dr:0 al:0 bm:1 lo:702 pe:0 ua:701 ap:0 ep:1 wo:b oos:162972
[===>................] sync'ed: 20.5% (162972/200692)K
finish: 0:00:17 speed: 9,428 (9,428) K/sec
[root@drbd3 ~]#









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