Menel

Updated Version of the apache http caching setup for snac, including proxy media

I already wrote about caching here
Now I extended what I cache a bit.
This was because after enabling Option to proxy media I've seen access to the file paths /x/ and /y/ in addition to the path were snac stores the media that I include in my own posts ( /s/ ).
There are two locations to proxy media, depending if you requests the media via the mastodonapi or via the web. (/x/ and /y/), oh and I added the nodeinfo2 path too, because I've noticed it was queried all the time by a lot of instances and it gives me pleasure to see something cached handed out in the access logs 🙂 (I guess it is actaully irrelevant for the system resources).
This is the updated setup:
Enable the relevant modules:

a2enmod expires cache cache_disk

Be sure "htcacheclean" is running to clean up old disk cache. (under debian see /etc/default/apache-htcacheclean or else the relevant systemd service or whatever)
Then add to the snac Virtualhost config:

<LocationMatch "^/social/[^/]+/[xys]/|^/social/nodeinfo_2_0">
CacheEnable disk
Header set Cache-Control "max-age=86400, public" "expr=%{REQUEST_STATUS} == 200"
ExpiresActive On
ExpiresDefault "access plus 86400 seconds"
</LocationMatch>

#snac / activitypub noob #question:

job fifo size (cur): 655
job fifo size (peak): 1291
thread #0 state: waiting
thread #1 state: output
thread #2 state: output
thread #3 state: output

(Medien: 1)

I'm using snac with and am following Hashtags now, and am getting a lot of nice content from specialized Hashtag-Relays. I have now a Problem with unwanted Posts that happen to use Hashtags I want to keep too. But I could Filter them my unwanted Hashtags they use.

Snac supports regex, but now The Question:
how do I know in what form the Regex is expected in my filter_reject.txt?
I want to block a Hashtag case insenitive
/#WhatIBlock/i
or (?i)#WhatIBlock
or maybe something else? It Seems the web is full of different ways to specify regex.

#snac #snac2 #regex #askfedi

After seeing
Improving snac Performance with Nginx Proxy Cache from @itnotes@snac.it-notes.dragas.net via
https://snac.it-notes.dragas.net/itnotes/p/1738139676.258050
https://it-notes.dragas.net/2025/01/29/improving-snac-performance-with-nginx-proxy-cache/
I decided to prematurely optimize and adjust this for my apache2 httpd server in debian where I run snac.

I've never done any caching etc before so it was a nice adventure to learn something new. The documentation helped and in the end it wasn't very hard. I learned a bit about some http headers and regex on the way too.

Basically it works like this:
Enable the relevant modules:

a2enmod expires cache cache_disk

Be sure "htcacheclean" is running to clean up old disk cache. (under debian see /etc/default/apache-htcacheclean or else the relevant systemd service)
Then add to the snac virtualhost config:

    CacheRoot /var/cache/apache2/mod_cache_disk
    CacheQuickHandler off
    CacheLock on
    #Optional while testing stuff;
    CacheDetailHeader on
    
    #My Instance ist not at the root, but under "/social"; so this needs to be adapted:
    <LocationMatch "^/social/[^/]+/s">
    CacheEnable disk
    ExpiresActive On
    ExpiresDefault "access plus 30 days"
    </LocationMatch>