Create shared disk for ocfs2:

• For VirtualBox see: Creating a shared disk for Oracle VirtualBox
• For VMware Player/Workstation see: Creating a shared disk for VMware Player/Workstation

Installing ocfs2 using yum:

# yum install ocfs*

Add the nodes to /etc/hosts if not already.

12.34.56.100    culbor1
12.34.56.101    culbor2

Use the following command to see your IP

# ifconfig

Configure /etc/ocfs2/cluster.conf using o2cb

# oc2b add-cluster cbcluster
# oc2b add-node cbcluster culbor1
# oc2b add-node cbcluster culbor2

Example of cluster.conf afterwards:

node:
    name = culbor1
    cluster = cbcluster
    number = 0
    ip_address = 12.34.56.100
    ip_port = 7777

node:
    name = culbor2
    cluster = cbcluster
    number = 1
    ip_address = 12.34.56.101
    ip_port = 7777

cluster:
    name = cbcluster
    heartbeat_mode = local
    node_count = 2

Note: the node name must be identical to the hostname

Copy the cluster.conf to all nodes

# scp -pr /etc/ocfs2/ culbor2:/etc/

Configure the Timeout settings with

# service o2cb configure

>Check if it all worked with

# service o2cb status

Try to force-reload if it didn't

# service o2cb force-reload

Set o2cb to autostart on all nodes

#chkconfig o2cb on
#chkconfig ocfs2 on

Change the following kernel parameters on all nodes in /etc/sysctl.conf (reboot required to enable these settings)

# vi /etc/sysctl.conf

kernel.panic_on_oops = 1
kernel.panic = 30

Disable selinux and iptables (warning not for production environment!)

# chkconfig iptables off
# vi /etc/selinux/config

SELINUX=disabled

Use fdisk to set the partition (only needed on one node)

# fdisk /dev/sdb

Navigate through the menu:

n (new partition)
p (primary)
1 (first partition)
confirm
confirm
Close fdisk with "w" to write the partition table

Use fdisk on all other nodes to confirm the partition table

# fdisk /dev/sdb

Issue w to write the changes to the disk

Create the folder where you want to mount the new disk (on all nodes)

# mkdir /u02

Format the disk with mkfs (only needed on one node). You can use mkfs parameters (such as label) if you like.

# mkfs.ocfs2 /dev/sdb1

Edit /etc/fstab and add the following line (on all nodes)

/dev/sdb1    /u02    ocfs2    defaults    1 2

Mount the new disk (on all nodes)

# mount /u02