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barrymw/enable purging of files in squid cache.md

Created October 6, 2022 02:15
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Enable purging of files in squid cache
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enable purging of files in squid cache.md

TL;DR

Ensure that your squid.conf includes the following configuration.

acl localhost  src 127.0.0.1/32 ::1
acl manager proto cache_object
acl purge method PURGE

# Only allow cachemgr access from localhost
http_access allow manager localhost
http_access allow localhost purge
http_access deny manager
http_access deny purge

squidclient -m PURGE <URL that is cached when it shouldn't be>

E.g:

# squidclient -m PURGE http://mirror.aarnet.edu.au/pub/centos/7.9.2009/updates/x86_64/repodata/repomd.xml
HTTP/1.0 200 OK
Server: squid/m.n.pp
Mime-Version: 1.0
Date: Thu, 06 Oct 2022 02:05:16 GMT
Content-Length: 0
X-Cache: MISS from proxy.somewhere
X-Cache-Lookup: NONE from proxy.somewhere:3128
Via: 1.0 proxy.somewhere (squid/m.n.pp)
Connection: close

If the URL isn't in the cache, the return code will be 404 Not Found instead of 200 OK.

This was based on the info found on https://help.getbusi.com/article/43-removing-individual-objects-from-squid-cache

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