Dynamically setting value for proxy_cache_valid

[RJoshi]

Is it possible to set a different value for proxy_cache_valid directive using Lua module?  I have a requirement to set different expire time per service.  

I tried below in Nginx.conf but gives error.

 set proxy_cache_value 1m;

proxy_cache_valid $proxy_cache_value;

[Yichun Zhang (agentzh)]

Hello!

IIRC, the proxy_cache_valid directive does not support nginx
variables. You can try patching the NGINX core to add the support (and
possibly proposing the patch to the nginx-devel mailing list too), or
wait for the upcoming cache_filter_by_lua* directives which support
custom Lua code to control the NGINX http cache on a per-request
basis.

Best regards,
-agentzh

[Guilherme]

RJoshi,

Alternatively, you could do something like this using named locations:

location @cache-1m {

    ...

    proxy_cache_valid 200 1m;

    proxy_pass ...

}

location @cache-10m {

    ...

    proxy_cache_valid 200 10m;

    proxy_pass ...

}

location @cache-default {

    ...

    proxy_cache_valid 200 1h;

    proxy_pass...

}

location / {

    access_by_lua_block {

        if service == 1 then

            ngx.exec("@cache-1m")

        elseif service == 2 then

            ngx.exec("@cache-10m")

        else

            ngx.exec("@cache-default")

        end

    }

}

Regards,

Guilherme

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[Nikolaos Tsipas]

Hello agentzh,

Is the cache_filter_by_lua* still on the roadmap? When is it expected to become available? 

Regards,

Nik

[David Birdsong]

On Thu, Sep 14, 2017 at 2:15 AM, Nikolaos Tsipas <nick...@gmail.com> wrote:

Hello agentzh,

Is the cache_filter_by_lua* still on the roadmap? When is it expected to become available? 

Will there be a cache_filter_by_lua_eviction or something similar that allows for a cosocket to fire when an object gets evicted for whatever reason?

 

Regards,

Nik

On Friday, February 12, 2016 at 4:47:18 PM UTC, agentzh wrote:

Hello!

On Thu, Feb 11, 2016 at 3:33 PM, RJoshi wrote:
> Is it possible to set a different value for proxy_cache_valid directive
> using Lua module?  I have a requirement to set different expire time per
> service.
> I tried below in Nginx.conf but gives error.
>
>  set proxy_cache_value 1m;
>
> proxy_cache_valid $proxy_cache_value;
>

IIRC, the proxy_cache_valid directive does not support nginx
variables. You can try patching the NGINX core to add the support (and
possibly proposing the patch to the nginx-devel mailing list too), or
wait for the upcoming cache_filter_by_lua* directives which support
custom Lua code to control the NGINX http cache on a per-request
basis.

Best regards,
-agentzh

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