Azure App Service - Auto-Heal vs Health Check

Question

Health Check can restart an instance. Auto-Heal also can restart an instance.

So, when should I use Health Check and when should I use Auto-Heal. Should I use them both together?

Answer 1

The Health Check feature is pretty basic compared to Auto-Heal. Basically it makes a request to a predefined url and if it does not get a succesful response it will take that instance out of the load balancer pool. If it remain unhealthy it will be replaces with a new instance. It works only if scale-out is applied to the web app.

Auto-Heal is much more sophisticated: instead of pinging a url it can be configured to restart an instance when a certain memory or cpu usage limit is reached, or when the response time is degraded during a certain period.