Thanks Dridi Boukelmoune. In my oppion, if the varnish is not the botterneck, it can take more backends.
I set 8 backends, and it seems works. And more, I see many connection failed in my varnishstat 2277628 0.00 67.73 backend_fail - Backend conn. failures After use ulimit to change configure, the issue was fixed. On Fri, Jan 11, 2013 at 4:03 PM, Dridi Boukelmoune < [email protected]> wrote: > Hi, > > About the 5 backends limit, you might be interested by this link: > https://www.varnish-cache.org/docs/trunk/phk/backends.html > > PHK basically states that 1000 backends is not an unreasonable number. > > I assume that backends are limited according to available resources > and other factors that can't be established without proper > measurements. > > Best regards, > Dridi > > On Fri, Jan 11, 2013 at 4:24 AM, Shaohui Zheng <[email protected]> > wrote: > > I refers other people's configure file on internet, it seems that it is > out > > of date :). > > > > the command varnishlog -b -i TxURL is a great for debugging. > > > > Thanks Rangel Raul & Peter Jacobs. > > > > the new VCL configure file works well, and the 503 error has been gone. > > > > You guys really solve me a big problem. > > > > I have other question, I know many people select LVS(Linux Virtual > Server), > > but I prefer Varnish. I hear from some guys said Varnish can only take 3 > ~ 5 > > backends, if it takes more backends, the performance will downgrade too > > much. Do you have some experience? how many backends can varnish maintain > > with best performance, just according to the experience. > > > > > > I already have 5 backends according to the workloads, but it seems that > the > > backends workload is still too high, I want to add more nodes. Waiting > for > > your advice, thanks. > > > > > > On Wed, Jan 9, 2013 at 11:14 PM, Rangel, Raul <[email protected]> > > wrote: > >> > >> varnishlog -b -i TxURL. > > > > > > > > > > > > -- > > Best regards > > Shaohui > > > > _______________________________________________ > > varnish-misc mailing list > > [email protected] > > https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc > -- Best regards Shaohui
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