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?
My bad solution:
sub vcl_init {
new upstream_rr = directors.round_robin();
key_rr.add_backend(srv1);
key_rr.add_backend(srv2);
}
sub vcl_recv {
if (req.restarts == 0) {
set req.backend_hint = upstream_rr.backend();
} else {
if (req.restarts == 1) {
std.syslog(180, "RECV IN PROG: set backend srv1");
set req.backend_hint = srv1;
} elseif (req.restarts == 2) {
std.syslog(180, "RECV IN PROG: set backend srv2");
set req.backend_hint = srv2;
} elseif (req.restarts > 2) {
std.syslog(180, "RECV IN PROG: use other DC backend default");
set req.backend_hint = default;
}
}
return (hash);
}
--
--
Николай Богданов
Инженер АО «Флант»
http://flant.ru/
+7 (495) 721-10-27, доб. 422
+7 (926) 125-39-69
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