[WBEL-users] high availability HOW TO?

[Christian Nygaard]

On Fri, 11 Feb 2005, Kyle Gasho wrote:

> Group,
>  
> I want to setup 2 Linux servers that will be redundant systems, both
> sharing the same IP and load balancing all ports and services on both.
> IE high availability
>  
> My first thought was to email this list, I've seen and read some GREAT
> post and thought this would be a good place to ask the question.
>  
> ...and of course I'm using WBEL!
>  
>  
> So where do I go from here?
>  

This is an advanced topic. First of all its not always certain that a 
redundant solution will provide greater availability as it adds complexity 
when things do go wrong.

You need to define what services you need to have redundant.

You will probably need to have something like a load balancer, 
that distributes the load between the servers and provides failover 
support if one of the nodes goes down, you can checkout Linux virtual 
server.

http://www.linuxvirtualserver.org/

If you are going to have redundant filesystems you need a clustered 
filesystem that can be shared between the nodes SAN + GFS, SCSI + GFS or 
iSCSI + GFS. RHEL Update 4 added iSCSI initiator support.

http://www.ultramonkey.org/
or Red Hat cluster suite http://www.redhat.com/software/rha/cluster/

//Chris