MACROMEDIA COLDFUSION MX-CLUSTERCATS Manuale Utente Scaricare il pdf (Pagina 150)

140 Chapter 7 Optimizing ClusterCATS

Troubleshooting the load-balancing metrics

If ClusterCATS gets an exception every time it processes getsimpleload.jsp, you may

have installed ClusterCATS before installing JRun. In this case, verify that the following

is true:

• JRunMetricThread.class file is located in /jrun/lib/ext

• The virtual directory /btauxdir is configured on your web server. (This was created

during installation, but you might have removed it.)

1 2 ... 145 146 147 148 149 150 151 152 153 154 155 156

Using ClusterCATS 1
CONTENTS 3
C o n t e n t s v 5
ABOUT THIS BOOK 7
Developer resources 8
Viewing online documentation 9
Contacting Macromedia 10
CHAPTER 1 11
Before You Begin 11
ClusterCATS overview 12
Detailed overview 13
• A user enters a new URL 14
• A user employs a bookmark 14
ClusterCATS overview 5 15
ClusterCATS components 16
System requirements 17
CHAPTER 2 19
What is scalability? 20
What is scalability? 11 21
Load management 22
Avoiding common bottlenecks 26
• “What is DNS?” on page 17 27
Zones and domains 28
What is website availability? 33
Common failures 34
Website availability scenario 35
Failover considerations 35
What is clustering? 38
• It uses proven technology 39
CHAPTER 3 43
Installing ClusterCATS 43
Before you install 44
Configuring server failover 48
Configuring firewalls 48
Analyzing web server content 49
After you install 55
CHAPTER 4 57
Configuring Clusters 57
ClusterCATS Server 58
Creating clusters 64
Creating clusters 55 65
Creating clusters 57 67
Creating clusters in UNIX 70
3 Click OK 71
Removing clusters 72
Adding cluster members 73
Removing cluster members 75
Server load thresholds 76
Server load thresholds 67 77
Server load thresholds 69 79
Server load thresholds 71 81
Session-aware load balancing 82
Session swapping overview 84
Using ColdFusion probes 87
Using ColdFusion probes 81 91
To remove a ColdFusion probe: 91
Using ColdFusion probes 83 93
Using JRun probes 94
Using JRun probes 85 95
To remove a JRun probe: 98
Using JRun probes 89 99
To add a new JRun probe: 99
Load-balancing devices 102
• dynamic-feedback -retry 103
Product drop-down list 104
Load-balancing devices 97 107
Administrator e-mail options 110
Administering security 113
Administering security 105 115
Administering security 107 117
CHAPTER 5 119
Maintaining Cluster Members 119
Resetting cluster members 130
CHAPTER 6 131
ClusterCATS Utilities 131
Using btadmin 132
Using btcfgchk 136
Using hostinfo 139
Using sniff 140
CHAPTER 7 141
Optimizing ClusterCATS 141
Using server failover 147
Overview of metrics 148
Load types 149
Output variables 149
142 Index 152
146 Index 156

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