varnish 4 to cache from multiple servers with different content

[Guillaume Quintard]

Hi,

There's no stickyness involved with the round-robin director. But from what
you are describing, Varnish is doing what you ask it to do: it caches from
one backend and keep serving the cached content (ie. it doesn't need to go
to the backends anymore).

If you wish to have a non-caching loadbalancer, then then "return (pass);"
at the end of vcl_recv and you'll be ok.

Otherwise, what behavior do you wish to obtain?

-- 
Guillaume Quintard

On Wed, Nov 23, 2016 at 3:59 PM, Sreenath Kodedala <vedarad at gmail.com>
wrote:

> http://stackoverflow.com/questions/40751646/varnish-4-
> to-cache-from-multiple-servers-with-different-content
>
>
> Using varnish 4 to cache different content of same request from multiple
> servers. It looks like it caches the first request from one server and
> keeps giving the same content for every subsequent request.
>
> doing curl gives response with two caches and different age.
>
> Are there any factors like load or anything else for stickiness behaviour?
> Used Jmeter and apache benchmark with load but still got the same behaviour.
>
> Is my vcl_hash is good? Want to save the object with hash combination of
> url and ip of backend server.
>
> am I missing anything?
>
> using round robin and hash_data. below is my config.vcl
>
> backend s1{
>     .host = "190.120.90.1";
> }
>
> backend s2{
>     .host = "190.120.90.2";
> }
>
> sub vcl_init {
>     new vms = directors.round_robin();
>     vms.add_backend(s1);
>     vms.add_backend(s2);
> }
>
> sub vcl_recv {
>     set req.backend_hint = vms.backend();
> }
>
> sub vcl_hash {
>     hash_data(req.url);
>     if (req.http.host) {
>         hash_data(req.http.host);
>     } else {
>         hash_data(server.ip);
>     }
>     return(lookup);
> }
>
>
> Thanks,
> Sreenath
>
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