Weird loadbalancing behavior from Classic ELB
We have 4x EC2 instances with httpd web server scattered across B and D zones. In random times of the day, one of the instances in Zone B would get none of the traffic and have its traffic rerouted the other EC2 instance in that zone.
The user-traffic would be like this:
- Zone B, Instance 1 - 50%
- Zone B, Instance 2 - 0%
- Zone D, Instance 3 - 25%
- Zone D, Instance 4 - 25%
I mentioned user-traffic above because the traffic from health checks during this period are equal across all machines and all of them are fine.
After 5 minutes it would return back to normal.
Any help would be appreciated.
Have you looked at this Knowledge center article:
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