On Tue, Jul 9, 2019 at 8:12 AM Nikolay Bogdanov <[email protected]> wrote: > > Hello. I have one case and I can not find good solution for it. > In varnish3 req.backend was saved during restarts, so I can compare old > backend property and set other backend after first restart. > But in varnish 5 and newer req.backend_hint in vcl_recv is default always. I > can not use retry in vcl_backend_response, because this function did not > called. > How can I fix it?
What you are looking for is probably a circuit breaker, you can implement one with vmod-saintmod: https://github.com/varnish/varnish-modules/blob/master/docs/vmod_saintmode.rst#vmod_saintmode However instead of using it with req, it's probably more efficient to work on the backend side and retry from vcl_backend_fetch or vcl_backend_error. Best, Dridi _______________________________________________ varnish-misc mailing list [email protected] https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc
