Citrix NetScaler Autoscaling
So had a case appear earlier today where we needed to scale out the NetScaler deployment within a container environment. More specific we needed a good way for NetScaler to automatic add new entries within a load balanced vserver when a container orchestration environment scaled out a stack with new containers.
So in most cases a container orchestration platform already has a built-in load balancing mechanism like HAproxy for instance which is used to load balance between the different containers within a host. In most cases you have multiple container hosts and therefore have multiple HAproxy instances with its own IP address and exposed port which represents a service.
Now we could of course have each HAproxy IP within a DNS entry with round robin, but that would not provide us with a good health monitoring service, so if a host went down and suddenly a service would be unavailable for some users who would connect.
Now we often need a new load balanced layer above the HAproxy tier to provide load balanced between the different HAproxy instances with proper health monitoring. The issue is that we need to insert the new container instances when they get provisioned so they are automatically load balanced.
Read the entire article here, NetScaler Autoscaling | Marius Sandbu
via Marius Sandbu.