[Linux-cluster] How to configure Squid Server Failover in RHCS

[gordan at bobich.net]

On Wed, 9 Apr 2008, Mshehzad Pankhawala wrote:

> Now i am testing a Squid server Failover.
> 
> One IP address (ex. 192.168.0.111) is allowed to connect to the internet directly.
> 
> I have two RHEL5 Server having Squid installed on it. and i want to configure Squid Fail over
> using RHCS on those two servers. But I can't find in Resource List Resource Like Squid Server
> (As like Apache Server).
> 
> After that I wrote a script to start the Squid Server And added it as Script resource but it
> failed. The proble is that I am getting requests from clients at 3128 port of Squid but they
> won't connect to internet at all.
> 
> I have desabled SELinux and Firewall from the begning of this testing.

Squid can be rather funny with what IP addresses/interfaces it binds to. 
I've found it works in a hot-failover setup (always runs on both servers) 
if you tell it to bind to a port without specifying the IPs (so it binds 
to all interfaces/IPs), and just fail over the IP - no need to bother 
specifying the fail-over service. Mind you, same holds true for Apache - 
you might as well have your servers as a load-balanced pair, rather than 
warm spare fail-over.

Gordan