Hi Sidharta, I'm not sure why the tutorial you linked to isn't adequate. Do you need the POST to also create an object in cache?
Kind regards, -- Guillaume Quintard On Sat, May 16, 2020 at 11:44 PM Sidhartha Agrawal <[email protected]> wrote: > Hi Varnish Community, > > I am a software developer at Arista Network in our Tools and > Infrastructure Group. We use Varnish(6.3.1) to cache our build objects such > as RPMS and images and Varnish is an integral part of our internal build > system. > > Some of these objects are of the order of ~500 MB, so a GET of multiple > such objects can put a significant load on the backend(OpenSwift). Since > there is an adequate temporal locality(within a day) between the POST of > the large object and the subsequent GET, we would like to cache the object > when the POST happens, so that the subsequent GET is guaranteed to find it > in the cache(unless evicted or expired). > > As I understand, Varnish bypasses the cache for POST and passes it > straight to the backend. We would like to change this behavior of POST to > also add an entry for the object in the cache if the write to the backend > was successful. > > A cursory google search for “Caching Post requests on Varnish” lead to me > this article > <https://docs.varnish-software.com/tutorials/caching-post-requests/#step-1-prepare-the-vcl-for-caching-post-requests>. > Though I do not think this is exactly what we need. The article talks about > avoiding a write to the backend if another POST request is made with the > same body. That is different from what we are trying to do. > > I would appreciate any insights you can provide in to: > > - > > What changes do I need to make to the VCL to achieve our desired > behavior > - > > Comments, on whether this is a bad idea for some reason. > > > I have been following the VCL state machine from this website > <https://varnish-cache.org/docs/6.3/reference/states.html#reference-states>. > I appreciate the help. > > -Sid > > _______________________________________________ > varnish-misc mailing list > [email protected] > https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc >
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