HP Cache Server Appliance Administrator Guide

iii
Preface ......................................................................... xii
Who should read this manual . . . . . ................................ xii
Conventionsusedinthismanual................................... xii
1 Overview ....................................................................... 1
WhatisTrafficServer?.........................................1
Traffic Server deployment options . . .................................1
TrafficServerasawebproxycache.................................2
TrafficServerasareverseproxy...................................2
TrafficServerinacachehierarchy..................................2
TrafficServerinacluster.......................................2
Traffic Server components . . . . . . .................................3
TheTrafficServercache.......................................3
The Adaptive Redirection Module (ARM) . .............................3
The Host Database. . ........................................3
TheDNSResolver..........................................4
TrafficServerprocesses.......................................4
Administrationtools..........................................5
Trafficanalysisoptions.........................................5
TrafficServersecurityoptions .....................................5
2 GettingStarted.................................................................. 7
Overview of Access Methods . . . . . .................................7
Verifying that Traffic Server is up and running .............................8
Accessing Traffic Manager . . . . . . .................................8
UsingtheMonitorandConfiguretabs................................9
Usingonlinehelp...........................................9
StartingTrafficLine.......................................... 10
RestartingTrafficServer....................................... 10
3 WebProxyCaching ............................................................. 11
Understanding web proxy caching . . ................................ 11
Adayinthelifeofacacherequest................................. 11
Ensuring cached object freshness . . ................................ 12
RevalidatingHTTPobjects..................................... 12
HTTP object freshness tests . . . . ................................ 13
DecidingwhethertoserveHTTPobjects.............................. 13
ConfiguringHTTPfreshnessoptions................................ 14
CachingHTTPalternates...................................... 14
Scheduling updates to local cache content. ............................ 16
Newsarticlecaching ......................................... 16
TrafficServerasanewsserver .................................. 17
TrafficServerasacachingproxynewsserver........................... 17
Supporting several parent news servers . . ............................ 17
Contents