HAProxy - stop catering requests on 500 from server

Question

Is there any way to stop catering further requests to server from HAProxy when a bankend server sends a 500?

When a server receives a signal like SIGINT, it will start serving "500 Server Internal Error" . SO when HAProxy detects 500 response from server, will it be able to stop further requests to the server?

There is a macro "on-error" which is enabled by default in server section. Trying that did not yield any result. For example:

server nucleus_server1 127.0.0.1:12341 check on-error mark-down

.the macro on-mark-down is not working along with this.

Any ideas?

Answer 1

If you want HAProxy marks server as DOWN based on return code sends by this server add 'observe layer7' option to server definition. For your example, it could look like:

server nucleus_server1 127.0.0.1:12341 check on-error mark-down observe layer7 error-limit 1

It means that if nucleus_server1 returns 500 to any client request it will be removed from the pool. By 'error-limit' you can configure how many 500's have to be returned to mark this server as 'DOWN'.

Server will be marked as 'UP' again if internal HAProxy check success (by default 2 times).

Take a look on: check, fall, raise, error-limit, observe options in HAProxy documentation for more info.