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The following is a diagram of the clustering scenario we will be setting up: 
Install OS
Install CentOS 5.6 on two identical servers. You may also configure the NICs at this point. One NIC will be for the iSCSI storage network (eth2), one will be for clustering heartbeat (eth1), and one NIC will be for all other communications, including sipXecs (eth0).
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When prompted for software selection, deselect desktop - – Gnome and select Clustering and Storage Clustering. Perform the install.
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chkconfig iscsi on onserviceservice iscsi start |
On each server you need to connect to a blank (fresh) shared iSCSI disk. For example, if your iSCSI shared disk is located at IP address 172.16.5.10 you would run the following command on each server:
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#!/bin/bash
#
#
#
# Simple script for cluster services to use for bare metal ethernet interface
#
# chkconfig: 345 89 14
# description: Starts and stops the clustered service network interface
# processname: net
#
# Source function library.
. /etc/init.d/functions
SIPX_IP='172.16.1.5'
SIPX_INTERFACE=eth0
CLUS_INTERFACE=eth2
ISCSI_INTERFACE=eth1
PROG_NAME=clusnet
RETVAL=0
DEFAULT_GW=`cat /etc/sysconfig/network-scripts/ifcfg-$SIPX_INTERFACE | grep GATEWAY | sed 's/GATEWAY=//g'`
SUBNET_MASK=`cat /etc/sysconfig/network-scripts/ifcfg-$SIPX_INTERFACE | grep NETMASK | sed 's/NETMASK=//g'`
INTUP=`/sbin/ifconfig | grep -c $SIPX_INTERFACE`;
# <define any local shell functions used by the code that follows>
start() {
echo -n "Starting $SIPX_INTERFACE: "
ip address flush dev eth0
sleep 3
ip address addifconfig $SIPX_INTERFACE $SIPX_IP/ netmask $SUBNET_MASK brd + dev eth0
ip up
sleep 3
route add default viagw $DEFAULT_GW dev $SIPX_INTERFACE
echo
echo -n $"$SIPX_INTERFACE is up.";
success $"$SIPX_INTERFACE is up.";
echo
chkconfig postgresql off
return $RETVAL
}
stop() {
echo -n "Shutting down $SIPX_INTERFACE: "
ifdown $SIPX_INTERFACE
ifup $SIPX_INTERFACE
ifup $ISCSI_INTERFACE
ifup $CLUS_INTERFACE
echo
echo -n $"Interface $SIPX_INTERFACE is down.";
success $"Interface $SIPX_INTERFACE is down.";
echo
chkconfig postgresql off
return $RETVAL
}
getstatus() {
if [ $INTUP -lt 1 ]
then
echo
echo -n $"Interface $SIPX_INTERFACE is down."
failure $"Interface $SIPX_INTERFACE is down."
echo
return 1;
fi
echo
echo -n $"Interface $SIPX_INTERFACE is up.";
success $"Interface $SIPX_INTERFACE is up.";
echo
return $RETVAL
}
case "$1" in
start)
start
;;
stop)
stop
;;
status)
getstatus
;;
restart)
stop
sleep 5
start
;;
*)
echo "Usage: $PROG_NAME {start|stop|status|restart}"
exit 1
;;
esac
exit $RETVAL
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Cluster Status for uc_cluster @ Sun Jul 3 14:46:41 2011 Member Status: Quorate Member Name ID Status ------ ---- ---- ------ 172.16.4.5 1 Online, Local, rgmanager 172.16.4.8 2 Online, rgmanager Service Name Owner (Last) State ------- ---- ----- ------ ----- service:sipXpbx 172.16.4.5 starteddisabled |
Create Clustered Storage
As of this writing the best filesystem to use for cluster storage is GFS. This is because unlike most other filesystems, GFS is safe to mount on both nodes at the same time without risking data corruption. This allows for quick failover with less risk of data corruption.
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/dev/sipx-vol/freeswitch /opt/freeswitch gfs defaults 0 0 /dev/sipx-vol/openfire /opt/openfire gfs defaults 0 0 /dev/sipx-vol/sipxdata /var/sipxdata gfs defaults 0 0 /dev/sipx-vol/etc_sipxpbx /etc/sipxpbx gfs defaults 0 0 /dev/sipx-vol/pgsql /var/lib/pgsql gfs defaults 0 0 |
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You'll also need to change the IP address of your primary node's communication interface (eth0) to an IP address that's different than the sipXecs system's IP address (but on the same subnet). This is so sipXecs can function on both nodes.back to the original settings by running:
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/usr/local/bin/clusnet stop |
DNS Caching Nameserver Configuration
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