Migrating from Varnish

[Andrei]

Hello Maxim!

On Nov 23, 2017 17:55, "Maxim Dounin" <mdounin at mdounin.ru> wrote:

Hello!

On Thu, Nov 23, 2017 at 09:00:52AM -0600, Andrei wrote:

> Hi all,
>
> I've been using Varnish for 4 years now, but quite frankly I'm tired of
> using it for HTTP traffic and Nginx for SSL offloading when Nginx can just
> handle it all. One of the main issues I'm running into with the transition
> is related to cache purging, and setting custom expiry TTL's per
> zone/domain. My questions are:
>
> - Does anyone have any recent working documentation on supported
> modules/Lua scripts which can achieve wildcard purges as well as specific
> URL purges?

Cache purging is available in nginx-plus, see
http://nginx.org/r/proxy_cache_purge.

I'm aware of the paid version, but I don't have  a budget for it yet, and
quite frankly this should be a core feature for any caching service. Are
there no viable options for the community release? It's a rather pertinent
feature to have in my transition


> - How should I go about defining custom cache TTL's for: frontpage,
> dynamic, and static content requests? Currently I have Varnish configured
> to set the ttl's based on request headers which are added in the config
> with regex matches against the host being accessed.

Normal nginx approach is to configure distinct server{} and
location{} blocks for different content, with appropriate cache
validity times.  For example:

    server {
        listen 80;
        server_name foo.example.com;

        location / {
            proxy_pass http://backend;
            proxy_cache one;
            proxy_cache_valid 200 5m;
        }

        location /static/ {
            proxy_pass http://backend;
            proxy_cache one;
            proxy_cache_valid 200 24h;
        }
    }

Note well that by default nginx respects what is returned by the
backend in various response headers, and proxy_cache_valid time
only applies if there are no explicit cache validity time set, see
http://nginx.org/r/proxy_ignore_headers.

So to override the ttls set by the backend, I would have to use
proxy_ignore_headers for all headers which can directly affect the intended
TTL?

Thank you for your time!


--
Maxim Dounin
http://mdounin.ru/
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