Maintenance page iRule. Need redirect AND rewrite.

Are maint.xyz.com and www.xyz.com both hosted on your LTM?

I do not know of a way to do that. Once you redirect, you have no more control over their connection. May I ask why you want to do that? BTW, you can accomplish the redirect from the http profile, by placing 'maint.xyz.com' in the fallback host window.

The LTM can serve out a good looking page (with images) from an iRule. It does take some doing though. You have to encode the images in base64 and load them into a class file. Here is a good link to some work that nitass has done: https://devcentral.f5.com/questions/maintenance-page

You will, of course, need to add some logic to keep an eye on the www.xyz.com pool. If you simply change the host header, after serving the maintenance page, you will create a race condition that will probably be terminated by the LTM.

I've been looking through your suggestion and working with Nitass' code. I was able to host the site on the LTM and get it to come up when all of the pool members come up, without images. Ideally, I would like to do this. Redirect to maint.xyz.com and replace the URL with www.xyz.com. Our maintenance pages often change so ideally I would redirect to a server with the maint page instead of having to recreate an irule every time the devs have to update the page. Of course the rewrite doesn't work.

when HTTP_REQUEST {
     Check if the VS default pool has no active members
    if { [active_members [LB::server pool]] < 1 }{
        HTTP::redirect "http://maint.xyz.com"
        HTTP::header replace Host "www.xyz.com"
       }
}