Monthly Archives: June 2014

Nginx purge (invalidate) cache

Posted by on June 19, 2014 No comments

How to purge cache record in ngix cache via http request.
Today we install awesome nginx plugin in production https://github.com/FRiCKLE/ngx_cache_purge/
How to use it – real life example:

1. Our cache location and proxy settings:

proxy_cache_path /var/cache/nginx/proxy_cache_quick levels=1:2 keys_zone=quick_cache:300m max_size=2m inactive=7d;

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How to test cdn delivery speed via curl

Posted by on June 8, 2014 No comments

Our company use our own CDN based on nginx caching. 7 high loaded (40 000 RPS per server) servers in 2 datacenters.
And periodically I observer some deviations in delivery time. from 0.15 to 7.5 or even 30 seconds.
We have nginx SLA module + Graphics and monitoring. But I need to test all servers for anomaly delivery time.

#!/bin/bash

for l in ip1.x.x.x \
         ip2.x.x.x \
         ....
         ipN.x.x.x; do

echo $l;

    for i in {1..1024}; do
    curl -s -w "%{time_total} -- %{time_connect}\n" -o /dev/null --resolve it.randomthemes.com:443:$l https://it.randomthemes.com/favicon.ico >> ./$l.txt
    done

done

Then analyse ipN.x.x.x.txt any way you like.

cat | sort -n | tail -n 25
etc.

Have a nice day. I really like curl and hope this will help someone.