On Mon, Mar 7, 2011 at 5:52 PM, Drew Smathers <[email protected]> wrote: > On Mon, Mar 7, 2011 at 5:39 PM, Per Buer <[email protected]> wrote: [snip] >> >> That's "Saint Mode" - please >> see http://www.varnish-cache.org/docs/trunk/tutorial/handling_misbehaving_servers.html#saint-mode >> I see that there isn't too much details on the semantics there. I'll see if >> I can add some details. > > Hi Per, > > I actually tried using saintmode for this problem but one point that I > found tricky is that saintmode (as far as i can tell from docs) can > only be set on beresp. If the backend is up, that's great because I > can check a non-200 status in vcl_fetch() and set. But in the case of > all backends being down, vcl_fetch() doesn't even get invoked and > there isn't any other routine and object in the routine's execution > context (that I know of) where I can set saintmode and restart. >
Sorry to bump my own thread, but does anyone know of a way to set saintmode if a backend is down, vs. up and misbehaving (returning 500, etc)? Also, I added a backend probe and this indeed caused grace to kick in once the probe determined the backend as sick.I think the docs should be clarified if this isn't a bug (grace not working without probe): http://www.varnish-cache.org/docs/2.1/tutorial/handling_misbehaving_servers.html#tutorial-handling-misbehaving-servers Finally it's somewhat disconcerting that in the interim between a cache expiry and before varnish determines a backend as down (sick) it will 503 - so this could affect many clients during that window. Ideally, I'd like to successfully service requests if there's an object in the cache - period - but I guess this isn't possible now with varnish? Thanks, -Drew _______________________________________________ varnish-misc mailing list [email protected] http://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc
