On Sat, Apr 21, 2012 at 3:47 PM, Rainer Duffner <[email protected]>wrote:
> Am Sat, 21 Apr 2012 09:25:06 +0100 > schrieb Neil Saunders <[email protected]>: > > > Hi all - > > > > A two part question on cache sharing: > > > > a) I've got 3 web servers each with a 3.5Gb memory cache. I'd like > > them to share a cache but don't want to use the experimental > > persistant storage backend - Are there any other options? > > > I think Java-software like ehcache (or some advanded derivative of > it) can do that. > But AFAIK, it requires close integration with the app that is cached. > I don't think you can just bolt ehcache on top of stuff like you can do > with varnish. > > > Rainer > Hi all - I've tried implementing the web server chaining suggested above but have run in to a dead end. Broad configuration: On all servers except the "last" in the chain I've defined: backend next_web_server { .host = "webX.domain.com"; .port = "80"; } And have added the following to vcl_recv: if (req.http.X-Cache-Warming ~ "true") { set req.backend = next_web_server; set req.hash_always_miss = true; return(lookup); } set req.backend = system; } And have the following vcl_hash: sub vcl_hash { hash_data(req.url); if (req.http.host) { hash_data(req.http.host); } return(hash); } My issue is that all "real" requests (i.e. those without the X-Cache-Warming header following cache warming) are cache missing on all web servers except the last one (The one thats actually going to the real backend during cache warming) - It's like the backend name is being explicitly hashed, but can't see anything that would indicate what's going on in the documentation. Any help appreciated! Ta, Neil
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