Hi, we are using LVS for some time now very successfully. Until now we just used the ipvsadm command and no backend monitoring via tools like ldirector. Currently we have these requirements which may be fulfilled using ipvsadm: 1. Adding and Removing realservers 2. Changing the weight of realservers
For technical reasons some applications have a persistance time of 8 hours. For maintenance we usually edit the weight of the corrensponding realserver to 0 and wait for the persistant connections to time out over night. Current users can still work for the day. In emergency situations we remove the realserver immedietly and all persistant clients are redirected to new real servers. No we would like to move to ldirectord with backend monitoring. So far we have tested and established the fact, that we can still use ipvsadm to manually modify the weight of the real server. Ldirector apparently does not mess with the weight as long as the state of the real server does not change (becomes unavailable). For maintenance we created a maintenance directory and set "quiescent=yes" in Ldirectord. When putting a realserver in maintenance mode we just create the appropiate file in the maintenance directory and the Ldirectord sets the weight to 0. New connections will be delegated to different realservers and the old persistant connections time out over night. Now the problem: We can still remove the real server with ipvsadm manually. This would ensure that even the persistant connections are dropped. Unfortunately Ldirectord adds the server again to the virtual server with a weight of 0. The persistant connections therefore still go on. Therefore I would like to actually remove the persistance template and all connections of a specific realserver from the kernel table similar to the way the conntrack tool/library allows modifications of the kernel connection tracking table. Modifying the ldirector configuration is possible but much more complicated on a complex loadbalancer serving several hundred real servers. Any ideas? Ralf _______________________________________________ Please read the documentation before posting - it's available at: http://www.linuxvirtualserver.org/ LinuxVirtualServer.org mailing list - [email protected] Send requests to [email protected] or go to http://lists.graemef.net/mailman/listinfo/lvs-users
