Hi all,
When I started my day today, I realized how strange our caching was
acting up. While the site was still running without problems for most of
it, the memory usage was a bit higher than usual.
After some digging, I realized that most of the requests weren't cached
and the logs were flooded with POST /wp-cron.php (see attachment). You
can see the Fastly caching graph at the rectangle, this is when I made
the change. After the change, you will see that the cache RATE jumped to
100% and the passes and requests dropped.
After some reading, I realized that its either that somebody is creating
a problem by constantly hitting our /wp-cron.php file(an attacker?), or
the caching layer checks too enthusiastically. A sure thing is that I do
not remember seeing that much requests, it would had jumped at me earlier.
In any case, the wp-cron.php will not be called from the outside anymore
but managed by our very own crontab. Problem solved.
--
Regards,
Renoir Boulanger | Developer operations engineer
W3C | Web Platform Project
http://w3.org/people/#renoirb ✪ https://renoirboulanger.com/ ✪ @renoirb
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