If the server is sending back errors, such as TCP resets or HTTP 5xx errors, then the server is assumed to have errors. The server should quickly respond with valid responses, such as HTTP 200. Passive health monitors do not send a check to the servers, instead, NSX Advanced Load Balancer monitors end-user interaction with the servers. While active health monitors provide a binary good/bad analysis of server health, passive health monitors provide a more subtle check by attempting to understand and react to the client-to-server interaction. The following are the configurable active health monitors: If one SE marks a server up and another SE marks a server down, each SE will include or exclude the server from load balancing according to their local monitor results. Each SE must be able to send monitors to the servers, which ensures there are no routing or intermediate networking issues that might prevent access to a server from all the active Service Engines. You can define send and receive timeout intervals, to determine the server response is successful or failed.Īctive health monitors originate from the Service Engines hosting the virtual service.
The following are the two types of health monitors:Īctive health monitors send customer queries to the servers. The health monitors are attached to a pool for a virtual service.Ī pool that is not attached to a virtual service will not send health monitors and is considered as an inactive configuration.Ī pool can have multiple actively concurrent health monitors, such as ping, TCP, and HTTP, and a passive monitor.Īll active health monitors must be successful for the server to be marked up. The following are the features of the health monitor: NSX Advanced Load Balancer sends active health monitors periodically that originate from Service Engines hosting the virtual service.
Health monitors perform this function either by actively sending a synthetic transaction to a server or by passively monitoring client experience with the server. NSX Advanced Load Balancer ensures that the servers perform correctly. NSX Advanced Load Balancer uses servers to accommodate additional workload before load balancing a client to a server. This section describes the details of health monitors used by NSX Advanced Load Balancer.
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