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Re: Unable to cache object within Squid

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On 25/06/2013 5:51 p.m., Reid Watson wrote:
Hi,

We seem to be having a strange issue with SQUID caching an object once it has been purged - this issue does not occur with all objects within the cache..

Quick Overview

- Four Apache Server with Squid Installed
- RedHat 5.7 i386
- squid-3.1.8-1.el5


Issue

- Admin sends a Purge request simultaneously to all four server

Example
1372113766.459      0 10.10.10.10 TCP_MISS/200 280 PURGE http://www.auckland.ac.nz/uoa/ - NONE/- -

- Squid seems to fail on caching the object
- All requests are sent to backend servers

Server 1
1372113766.459      0 10.10.10.10 TCP_MISS/200 280 PURGE http://www.auckland.ac.nz/uoa/ - NONE/- -
372113766.779     23 10.10.10.3 TCP_MISS/504 5063 GET http://www.auckland.ac.nz/uoa/ - NONE/- text/html

What exactly is this 504 error saying?

1372114043.139 106378 127.0.0.1 TCP_MISS/200 9891 GET http://www.auckland.ac.nz/uoa/ - FIRST_UP_PARENT/vip-dr text/html
1372114043.303  10112 127.0.0.1 TCP_MISS/500 24731 GET http://www.auckland.ac.nz/uoa/ - ANY_PARENT/vip-dr text/html
1372114105.918      0 10.10.10.3 TCP_MISS/504 4591 GET http://www.auckland.ac.nz/uoa/ - NONE/- text/html
1372114106.414  57182 127.0.0.1 TCP_MISS/200 69995 GET http://www.auckland.ac.nz/uoa/ - FIRST_UP_PARENT/vip-dr text/html
1372114106.419  55771 127.0.0.1 TCP_MISS/200 45853 GET http://www.auckland.ac.nz/uoa/ - ANY_PARENT/vip-dr text/html
1372114106.436  17387 127.0.0.1 TCP_MISS/200 69967 GET http://www.auckland.ac.nz/uoa/ - FIRST_UP_PARENT/vip-dr text/html
1372114106.490  60516 127.0.0.1 TCP_MISS/200 70115 GET http://www.auckland.ac.nz/uoa/ - FIRST_UP_PARENT/vip-dr text/html
1372114106.707  58628 127.0.0.1 TCP_MISS/200 70115 GET http://www.auckland.ac.nz/uoa/ - ANY_PARENT/vip-dr text/html

And why are the 200 status when they do occur taking so very long to generate?

- if you send a reload command (/sbin/service squid reload) the object is stored within the cache instanlty

What are the headers sent from the origin server to Squid?

Amos





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