IP Virtual IP

Icantprintinlinux · 03-28-2008, 01:07 PM

Hey I am trying to use heartbeat in CentOS with apache

and I need to make a virtual IP address

for example

node1.gogordie.ca (this server is the main webserver) and if it goes down i need Heartbeat to kick in and start up apache on node2.gogordie.ca (I have no problem getting that far). Now apparently I need to make a virtual IP address for the main web server.

How do I make virtual IP address

msound · 03-28-2008, 01:53 PM

This seems like a fairly straightforward tutorial:

http://linuxhelp.blogspot.com/2005/0...resses-on.html

If you google for:
"redhat how to assigned multiple ip addresses to a single nic"

You'll get a lot of useful results.

Cheers!

Linville79 · 03-28-2008, 03:39 PM

First, make an alias of your interface:

Code:

cd /etc/sysconfig/network-scripts
cp ifcfg-eth0 ifcfg-eth0:10

Next, edit the alias file:

Code:

DEVICE=eth0  <-- change to eth0:10
ONBOOT=yes
TYPE=Ethernet
IPADDR=192.168.0.100 <-- change to new IP address **
NETMASK=255.255.0.0
GATEWAY=192.168.0.254

** if you're using dhcp, you won't have this line, you'll have a line like:
BOOTPROTO=dhcp

Next, start the new interface:

Code:

ifup eth0:10

Next, check to make sure the interface is up and has an IP address:

Code:

ifconfig -a

You're done. You now have two IP addresses for the same network interface card.

Icantprintinlinux · 03-28-2008, 05:32 PM

thanks man, that help out a lot

thumper_808 · 05-28-2009, 12:58 PM

Hi Icantprintinlinux,
I've done the hardcoding of the ip aliases but that just load-balances...right? I thought you were looking for IP failover. so, you only have 1 out of the 2 servers ever answering requests (http in your case). That's what i'm looking for except it's for mysql. i'm clearly no expert but I have been working with Heartbeat for 2 weeks and simply cannot get Heartbeat to spawn the virtual address that's labelled in the haresources file.

Have you had any luck?