Re: High Availability options for a webobjects application
Re: High Availability options for a webobjects application
- Subject: Re: High Availability options for a webobjects application
- From: Chuck Hill <email@hidden>
- Date: Fri, 26 Feb 2010 10:13:37 -0800
On Feb 26, 2010, at 8:19 AM, Matt Stokes wrote:
Looking for HA options for a WebObjects application.
Is it possible to have a HA (high availability) web server
Something like this?
http://www.ibm.com/developerworks/linux/library/l-linux-ha/
pointing to 'n' number of sites with a web server/instances/
database setup for each of the "n" sites.
I don't think that is the way to do it. You want a director in front
of N Apache machines that all share X app server boxes that talk to
one of several boxes in a DB cluster.
Users could get routed to any site when they go to www.example.com,
which will redirect to
site1.example.com
site2.example.com
.....
....
siteN.example.com
If there is a failure on any of the sites - then you take it offline
by changing the configuration on the master HA web server.
But the site does not run _in_ Apache. Apache and the woadaptor just
direct it to an instance. This does not address session failover when
one of the instances dies. Instance death is far more likely than
Apache death.
I am not sure that you need the different domain names.
Looks ok on paper but not entirely convinced that this will be
problem free. What are the pitfalls in a setup like this?
Make sure any cookie domain is just "example.com".
Chuck
--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems.
http://www.global-village.net/products/practical_webobjects
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