Wordpress+WP-E-COMMERCE+VARNISH

[Damon Snyder]

See some suggestions inline below. Hope this helps get you started.


Server configuration (planned):
> Intel(R) Xeon(R) CPU X5460 @ 3.16GHz, 3 cores, 1.75 GB of RAM, Max of 3 GB
> burstable
> Linux 2.6.32-042stab044.17 on i686 (CenOS 6.2)
>

This is probably overkill. Varnish/nginx are not that cpu intensive. You
are probably fine with that amount of memory to get started.


> Questions:
> How can I tell Varnish to enable cache on certain url and let pass cookies
> on others/rest of the site?
>

Check out the docs on how to cache/not specific urls. Its pretty straight
forward. See https://www.varnish-cache.org/docs/3.0/tutorial/vcl.html. One
thing you want to do from the start is add a HIT/MISS header for debugging
your configuration. See
https://www.varnish-cache.org/trac/wiki/VCLExampleHitMissHeader.


> Having 500.000 visits/month what's the best practice for cache purge?
>

Purge whenever you have new content. The purging is lazy, so you don't have
to worry about purging being costly or effecting the operation.


> How can i configure varnish and nginx, one serving cached pages and the
> other (nginx) serving static content like images ON THE SAME MACHINE. I
> have 2 spare IP address.
>

This is pretty common. You can have nginx serve maint pages and static
content then proxy_pass to varnish for the content you want cached.


> I have HyperCache plugin for Wordpress, it generates static files of the
> site and sends it to nginx to serve. APC also do its work. Should I disable
> HyperCache and let Varnish take care of the PHP content?
> More on HyperCache on http://www.satollo.net/**plugins/hyper-cache<http://www.satollo.net/plugins/hyper-cache>


Varnish is good at what it does. I would lean on varnish first so long as
you can get the purging hooked in to wordpress. Since your content is
updated on a schedule, you could probably purge by hand when new content is
published.

Hope this helps,
Damon


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