Debugging Nginx Cache Misses: Hitting high number of MISS despite high proxy valid
lucas at lucasrolff.com
Sat May 12 16:29:43 UTC 2018
It can be as simple as doing a curl to your “origin” url (the one you proxy_pass to) for the files you see that gets a lot of MISS’s – if there’s odd headers such as cookies etc, then you’ll most likely experience a bad cache if your nginx is configured to not ignore those headers.
From: nginx <nginx-bounces at nginx.org> on behalf of Quintin Par <quintinpar at gmail.com>
Reply-To: "nginx at nginx.org" <nginx at nginx.org>
Date: Saturday, 12 May 2018 at 18.26
To: "nginx at nginx.org" <nginx at nginx.org>
Subject: Debugging Nginx Cache Misses: Hitting high number of MISS despite high proxy valid
My proxy cache path is set to a very high size
proxy_cache_path /var/lib/nginx/cache levels=1:2 keys_zone=staticfilecache:180m max_size=700m;
and the size used is only
sudo du -sh *
Proxy cache valid is set to
proxy_cache_valid 200 120d;
I track HIT and MISS via
add_header X-Cache-Status $upstream_cache_status;
Despite these settings I am seeing a lot of MISSes. And this is for pages I intentionally ran a cache warmer an hour ago.
How do I debug why these MISSes are happening? How do I find out if the miss was due to eviction, expiration, some rogue header etc? Does Nginx provide commands for this?
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