Remove mod_pagespeed from acces.log

Hello,

Im trying to remove the user agent mod_pagespeed from the acces.log of websites. This internal request gets logged with the web traffic. This causes for 1000mb plus traffic a day on the ispconfig web traffic page. Of course because it is an internal request we shouldn't log it. Below an example how it looks.

Code:

*ipofserver* - - [24/Jan/2019:13:40:13 +0100] "GET /wp-content/***.jpg HTTP/1.1" 200 1806 "https://***.com/*" "Serf/1.3.9 (mod_pagespeed/1.13.35.2-0)"
*ipofserver* - - [24/Jan/2019:13:40:13 +0100] "GET /wp-content/***.jpg HTTP/1.1" 200 1806 "https://***.com/*" "Serf/1.3.9 (mod_pagespeed/1.13.35.2-0)"
*ipofserver* - - [24/Jan/2019:13:40:13 +0100] "GET /wp-content/***.jpg HTTP/1.1" 200 1806 "https://***.com/*" "Serf/1.3.9 (mod_pagespeed/1.13.35.2-0)"

I found this posts online on how to do it: https://bjornjohansen.no/exclude-requests-from-nginx-access-log
The problem here is that when I add "if=$log_ua" to the end of the access_log in the nginx server block it gets removed whenever ispconfig changes the file. Is there maybe a way I can do this exclude trick globally or configure something in the nginx pagespeed module itself. I couldn't understand there were not more people having this issue with mod_pagespeed logging all the internal requests. And thus ispconfig giving false information about the web traffic a website was using.

 

I found 2 posts mentioning the same problem I'm having. Still haven't found a pretty solution to exclude the mod_pagespeed requests from the ispconfig web traffic.

http://forum.directadmin.com/showthread.php?t=56037
https://joomla.stackexchange.com/questions/24003/site-keeps-browsing-itself-all-the-time

 

Thanks once again, I didn't know this feature existed. For anyone wondering how I fixed it.

Add this to your nginx http block

Code:

map $http_user_agent $log_ua {
    ~mod_pagespeed 0;
    default 1;
}

And modify the custom nginx_vhost.conf.master to this

Code:

<tmpl_if name='logging' op='==' value='yes'>
        error_log /var/log/ispconfig/httpd/<tmpl_var name='domain'>/error.log;
        access_log /var/log/ispconfig/httpd/<tmpl_var name='domain'>/access.log combined if=$log_ua;
</tmpl_var>
<tmpl_if name='logging' op='==' value='anon'>
        error_log /var/log/ispconfig/httpd/<tmpl_var name='domain'>/error.log;
        access_log /var/log/ispconfig/httpd/<tmpl_var name='domain'>/access.log anonymized if=$log_ua;
</tmpl_var>

Requests from mod_pagespeed will no longer show up in the access.log and thus not in the web traffic quota.