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NOTE: BOTH SERVERS ARE IDENTICAL EXCEPT ETH0 LOCAL IP

Server IP's :

LAN IP Range = 192.168.1.*

192.168.1.30 = Virtual_IP
192.168.1.10 = node1 eth0
192.168.1.20 = node2 eth0

DRBD Network :

DRBD Network is Back2Back Nic's directly Connected.

Using a /30 bitmask with only 2 Usable IP's. ( Network Map at Bottom), increment port number in DRBD res config.

http://serverfault.com/questions/328804/direct-ethernet-link-between-two-servers

drbd# on node1 = 10.1.1.1:778{8,9..}
drbd# on node2 = 10.1.1.2:778{8,9..}

Disk Layout :

/dev/sda = OS
/dev/sdb1 = drbd1 = SQL 
/dev/sdb2 = drbd2 = APACHE
/dev/sdb3 = drbd3 = DATA

/etc/hosts

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.1.10 node1.freesoftwareservers.com node1
192.168.1.20 node2.freesoftwareservers.com node2

/etc/hostname or /etc/sysconfig/network

node#.freesoftwareservers.com

 

https://www.aelius.com/njh/subnet_sheet.html

/30 -- 64 Subnets -- 2 Hosts/Subnet

Network #IP RangeBroadcast
.0.1-.2.3
.4.5-.6.7
.8.9-.10.11
.12.13-.14.15
.16.17-.18.19
.20.21-.22.23
.24.25-.26.27
.28.29-.30.31
.32.33-.34.35
.36.37-.38.39
.40.41-.42.43
.44.45-.46.47
.48.49-.50.51
.52.53-.54.55
.56.57-.58.59
.60.61-.62.63
.64.65-.66.67
.68.69-.70.71
.72.73-.74.75
.76.77-.78.79
.80.81-.82.83
.84.85-.86.87
.88.89-.90.91
.92.93-.94.95
.96.97-.98.99
.100.101-.102.103
.104.105-.106.107
.108.109-.110.111
.112.113-.114.115
.116.117-.118.119
.120.121-.122.123
.124.125-.126.127
.128.129-.130.131
.132.133-.134.135
.136.137-.138.139
.140.141-.142.143
.144.145-.146.147
.148.149-.150.151
.152.153-.154.155
.156.157-.158.159
.160.161-.162.163
.164.165-.166.167
.168.169-.170.171
.172.173-.174.175
.176.177-.178.179
.180.181-.182.183
.184.185-.186.187
.188.189-.190.191
.192.193-.194.195
.196.197-.198.199
.200.201-.202.203
.204.205-.206.207
.208.209-.210.211
.212.213-.214.215
.216.217-.218.219
.220.221-.222.223
.224.225-.226.227
.228.229-.230.231
.232.233-.234.235
.236.237-.238.239
.240.241-.242.243
.244.245-.246.247
.248.249-.250.251
.252.253-.254.255
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