Labels and purge scope

[Adrien Bigot]

Thank you for this confirmation !

Now I know this is the same cache, I will move the ban block in the main
VCL !

Thanks again !

Regards,

--

Adrien Bigot

Le 19/12/2019 à 16:14, Guillaume Quintard a écrit :
> Hi,
>
> Yes, labels are going to access the same cache , exactly like a
> reloaded vcl is going to use the same cache as the vcl it replaced.
>
> So, sending one request on any domain is going to work, but wouldn't
> it be more straightforward to just have the ban block in the main vcl,
> before you dispatch the request to a sub vcl?
>
> Cheers,
>
>
> On Thu, Dec 19, 2019, 15:07 Adrien Bigot <adrien.bigot at smile.fr
> <mailto:adrien.bigot at smile.fr>> wrote:
>
>     Hello,
>
>     I plan to use labels on a Varnish stack in front of multiple backends.
>     I have a question about ban with multiple labels.
>
>     My main.vcl will route requests in function of Host header for
>     example like this :
>
>     if (req.http.host == "front.mydomain.com
>     <http://front.mydomain.com>") {
>           return (vcl(l_varnish_fronts));
>         }
>         if (req.http.host == "api.mydomain.com
>     <http://api.mydomain.com>") {
>           return (vcl(l_varnish_api));
>         }
>
>
>     When we want to ban objects we do it with a HTTP BAN method on
>     each varnish server. Varnish handle it the BAN request like that 
>     in each label's VCL file :
>     sub vcl_recv {
>             if (req.method == "BAN") {
>
>             if (req.http.Cache-BanExpression) {
>                 ban(req.http.Cache-BanExpression);
>             }
>             return (synth(200, "Banned"));
>     }
>
>
>     My question is if I want to purge contents like this :
>
>     curl -XBAN --header 'Cache-BanExpression:
>     obj.http.Cache-Tags-TeamCompetitionReference ~ (^|,)6847(,|$)'  
>     http://myVarnishIP
>
>     Will them be banned for all my Labels (if I include the proper vcl
>     code in main.vcl), or do I have to make a request for each label
>     like :
>     curl -XBAN --header 'Host: front.mydomain.com
>     <http://front.mydomain.com>' --header 'Cache-BanExpression:
>     obj.http.Cache-Tags-TeamCompetitionReference ~ (^|,)6847(,|$)'  
>     http://myVarnishIP
>     curl -XBAN --header 'Host: api.mydomain.com
>     <http://api.mydomain.com>'    --header 'Cache-BanExpression:
>     obj.http.Cache-Tags-TeamCompetitionReference ~ (^|,)6847(,|$)'  
>     http://myVarnishIP
>
>
>     In fact, I want to know if the cache is mutualized between labels
>     ? If yes, is a solution exists to purge contents in all labels
>     without sending multiple BAN requests ?
>
>     Thanks in advance.
>
>     Best regards,
>
>     -- 
>
>     Adrien Bigot
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