Hello, I need your help on configuring servers backup in a backend. This is my current (simplified) backend setup :
backend ws_be mode http option redispatch cookie c insert indirect nocache attr "SameSite=Lax" balance roundrobin server s1 1.2.3.3:1234 cookie s1 check server s2 1.2.3.3:2345 cookie s2 check option allbackups server sb1 2.3.4.5:3456 cookie s1 check backup server sb2 2.3.4.5:4567 cookie s2 check backup FYI, the servers of this backend are node.js processes (dynamic content and websockets). Case 1 : If s1 or s2 is DOWN all the connexions are redispatched to the remaining UP server (s1 or s2). Case 2 : If s1 AND s2 are DOWN, all the connexions are redispatched on sb1 and sb2 backup servers. In the second case, the global application performance is similar to the normal situation where all main servers are UP. However, in the case one, the application performance can be degraded because there is only one server serving requests instead of two (and backup servers are inactive). I would like to modify the current setup so if there is a main server down, it's at once replaced by a backup server and all the connexions redispatched from DOWN server to a backup server. Of course, there may be variations : - 1 main server DOWN -> Corresponding backup server activated - 1 main server DOWN -> all backup servers activated - 1 main server DOWN -> some backup servers activated Any idea on how to achieve this ? -- Best regards, Artur
