Forum Discussion
NimbostratusVirtual Server availability between LTM and GTM
Hello,
We have a Virtual Server in each of our data centers, let's call it 0.0.0.1, configured in our LTM that only has an iRule as its resource. The iRule takes all requests pointed at 0.0.0.1 and redirects them to a different Virtual Server based on their HTTP referer. For instance, if a user goes to www.example.com, our DNS server points it at 0.0.0.1, and when the request arrives the LTM redirects it to 1.1.1.0. If a user goes to www.anotherexample.com, our DNS server points it 0.0.0.1 and the LTM redirects it to 2.2.2.0.
Since the iRule is processed on first priority, http health checks don't return anything. In our GTM, we've set up a Wide IP pool which includes 0.0.0.1, however the GTM constantly marks the Virtual Server as "Offline" since it can't verify its health (since the IP address isn't reachable). Is there a way to force the GTM to mark the server as "Available" even when the health checks can't reach it?
Thank you for your help!
7 Replies
AllrecipesDCO_1Also, for further reference, I've tried the following health monitor and it still comes back "Offline": GET / HTTP/1.0\r\nHost: www.example.com\r\n and GET / HTTP/1.0\r\nReferer: www.example.com\r\n
Cory_50405Noctilucent
You could disable health checking completely if you have no need for it. Just remove all monitors from the GTM pool and uncheck Verify Virtual Server Availability in the pool configuration. The wide IP will still respond without health checking.
- AllrecipesDCO_1Awesome, thanks Cory! I just tested and this appears to work. I'll use this workaround for now, until I can find some way to get the LTM and GTM to communicate properly.
- Cory_50405Is there a reason you want to pursue having a monitor on this pool if all you are doing is redirecting to other virtual servers that (hopefully) have health checking enabled? I guess I see this as more of a permanent solution versus just a work around but I'm also looking in from the outside. I'm sure you have your reasons.
- AllrecipesDCO_1I'd prefer to have the GTM actively notifying me if it's unable to send traffic there, rather than bypassing the health check and assuming that the iRule is doing its job, but I see your point, too. I guess it's more of a peace-of-mind thing for me.
- nag_54823
Cirrostratus
why can't we use iquery monitoring between GTM and LTM ?
- AllrecipesDCO_1We can and do use iQuery monitoring between the two.
