> On 31 Jul 2017, at 22:41, bjun...@gmail.com wrote: > > Hi, > > i'm experimenting with some Lua code in HAProxy where i need a simple > key/value store (not persistent). I want to avoid Redis or other external > dependency. > > Is there some sort of shared memory segment in HAProxy Lua integration that > can be used? (or is it possible to access HAProxy stick-tables from Lua?)
Adding shared memory segment in Lua is an interesting way. Adding a key/value system with Lua using shared memory seems very smart, but the development of this kind of function may be complicated and needs a little bit of brainstorm. As the shared memory is local on the system, the information is not shared between nodes distributed on servers. Also I have some doubts about the right usage of these system because shared memory requires lock (sem) and haproxy doesn’t like locks. Its not possible today to access to the stick tables with other method than the sample fetches and converters bindings. In other way, peer protocol requires full mesh connections (I’m using 12 HAProxy, so 66 connections) I prefer sharing data with stick tables, mechanism are already written and are reliable, but the content stored is limited. Maybe a peer protocol hierarchical concentrator will be welcome. Note that, for my own usage I’m brainstorming with Redis. This software is very light and fast. My goal is tracking sessions on many servers. So I think to this behaviour: - Each haproxy reads the local redis, - HAProxy send updates message in MULTICAST/UDP and all nodes receives the update (this way may loose messages) Sharing data between HAProxy is not so easy :-) Thierry > ---------------------- > Best Regards > > Bjoern
