Hi, I'm trying to understand some behavior we are seeing. We run a group of IPVS director nodes all active with BGP for advertising their addresses and every IPVS node is running both the master and slave sync processes. We run our real nodes in TUN mode (for direct server return).
We believe that some times new connections are reset before they can be established if the network delivers packets to the wrong node before state has been synced. For the most part this doesn't happen but we have encountered a few scenarios mostly involving maintenance or testing new BGP related configs (like removing source interface from ECMP hash) that have caused it. Currently we have these default settings: >cat /proc/sys/net/ipv4/vs/sync_threshold 3 50 >cat /proc/sys/net/ipv4/vs/sync_refresh_period 0 I've read the sysctl docs for these settings and I don't really understand the interaction of the 2nd number in sync_threshold with sync_refresh_period being set to 0. Looking at this, I think we would desire sync_threshold to be "1 $something" but I don't know what $something should be. Or should we only really care about state changes and set it to "0 $something" ? I'm trying to figure out if there would be any unintended consequences of changing these to either 1 or 0. Thanks, Phillip Moore _______________________________________________ Please read the documentation before posting - it's available at: http://www.linuxvirtualserver.org/ LinuxVirtualServer.org mailing list - lvs-users@LinuxVirtualServer.org Send requests to lvs-users-requ...@linuxvirtualserver.org or go to http://lists.graemef.net/mailman/listinfo/lvs-users
