Layout and Configuration of the Squid Monitoring Machines

Introduction

This document describes the current setup of squid monitoring machines that provide the web service, with a detailed look at the component (i.e. logs, scripts, etc.) distribution in the machines' filesystems.

Network Environment

The service is provided by two identical machines (wlcgsquidmon{1,2}), which are behind a DNS Round-Robin alias. Given that the default policy of Linux clients for a connection-refused event is to try the next available host in the DNS alias, the machines are running HTTP and Rsync servers concurrently for reliability. On the other hand, the SNMP polls are emitted only by the one machine of the pair currently marked as "Master".

Filesystem Layout

All relevant activity in the machines is performed under the squidmon user. The following tree-view describes the layout of squidmon's home. This tree is 3-level deep, it allows opening/closing of branches.

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-- LuisLinares - 08-May-2013