PURGING objects on multiple instances of varnish

[Stephen Wood]

What does your VCL look like?


On Wed, May 29, 2013 at 9:50 AM, Puneet <puneet.arora at insticator.com> wrote:

> Hi Stephen,****
>
> ** **
>
> Yes the Varnish will use hash_director.****
>
> ** **
>
> The Load Banalcer is executing in Round Robin manner. The LB is connected
> to 4 instances of Varnish which will be given requests in Round Robin
> fashion.****
>
> ** **
>
> Now, in order to send the request to Varnish directly, I need the host to
> be the IP & Port of the varnish instances.****
>
> i.e. let I have ONE varnish instance at 192.168.0.23 at port 3002****
>
> so the request will be for “ –XPURGE
> http://192.168.0.23:3002/<path-to-object> “****
>
> ** **
>
> By, doing that Varnish gives a response stating “405 Object Not in Cache”*
> ***
>
> ** **
>
> Thanks****
>
> Puneet****
>
> ** **
>
> *From:* Stephen Wood [mailto:smwood4 at gmail.com]
> *Sent:* Tuesday, May 28, 2013 5:42 PM
> *To:* Puneet
> *Cc:* varnish-misc at varnish-cache.org
> *Subject:* Re: PURGING objects on multiple instances of varnish****
>
> ** **
>
> Generally speaking, the varnish setup you are describing would use a hash
> director and not round-robin, so that the object would only be cached on
> one of your varnish nodes and therefore only require a single purge request.
> ****
>
> ** **
>
> If your object lives on multiple nodes, then you could do something simple
> like send a HTTP request to *every* one of your hosts. This would require
> you to keep a list of your hosts and also create the appropriate
> permissions on all of your varnish instances: ****
>
> ** **
>
> $ for i in `cat varnish_host.list`; do curl -XPURGE http://$i/object;done*
> ***
>
> ** **
>
> I hope that helps. Maybe somebody can offer a better solution than myself.
> ****
>
> On Tue, May 28, 2013 at 2:17 PM, Puneet <puneet.arora at insticator.com>
> wrote:****
>
> Hi All,****
>
>  ****
>
> I am using a Load Balancer (LB) in front of Varnish instances. Just say
> the LB is listening on Port: 80 and there are multiple instances of Varnish
> on different port nos.****
>
> i.e. I have a single LB which is connected to 4 instances of varnish, and
> LB is executing in a round-robin fashion. ****
>
>  ****
>
> Now, how can I purge objects on Varnish and maintain consistency among
> different instances of Varnish.****
>
>  ****
>
> Thanks****
>
> Puneet****
>
>  ****
>
>  ****
>
>
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>
> ** **
>
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