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Device Manager Guide, Cisco ACE 4700 Series Application Control Engine Appliance

OL-26645-02

Chapter 6 Configuring Real Servers and Server Farms

Configuring Health Monitoring

• HTTP_PROBE_SCRIPT

• HTTPCONTENT_PROBE

• HTTPHEADER_PROBE

• HTTPPROXY_PROBE

• IMAP_PROBE

• LDAP_PROBE

• MAIL_PROBE

• POP3_PROBE

• PROBENOTICE_PROBE

• RTSP_PROBE

• SSL_PROBE_SCRIPT

These scripts are located in the probe: directory and are accessible in both the Admin and user contexts.

Note that the script files in the probe: directory are read-only, so you cannot copy or modify them.

However, you can copy files from the probe: directory. For more information, see the Administration

Guide, Cisco ACE Application Control Engine.

To load a script into memory on the ACE appliance and enable it for use, use the script file command.

For detailed information on uploading and executing Toolkit Command Language (TCL) scripts on the

ACE appliance, refer to the Server Load-Balancing Guide, Cisco ACE Application Control Engine.

Configuring Health Monitoring for Real Servers

To check the health and availability of a real server, the ACE appliance periodically sends a probe to the

real server. Depending on the server response, the ACE appliance determines whether to include the

server in its load-balancing decision.

Note You can configure the inband health monitoring feature and health probes to monitor the health of the

real servers in a server farm. When you do, both are required to keep a real server in service within a

server farm. If either feature detects a server is out of service, the ACE does not select the server for load

balancing. For more information on inband health monitoring, see the “Configuring Server Farms”

section on page 6-18.

Use this procedure to establish monitoring of real servers to determine their viability in load-balancing

decisions.

Procedure

Step 1 Choose Config > Virtual Contexts > context > Load Balancing > Health Monitoring. The Health

Monitoring table appears.

Step 2 Click Add to add a new health monitoring probe, or select an existing entry, and then click Edit to

modify it. The Health Monitoring screen appears.

Step 3 In the Name field, enter a name that identifies the probe and that associates the probe with the real server.

Valid entries are unquoted text strings with no spaces and a maximum of 64 characters.

Step 4 In the Type field, select the type of probe you want to use. The probe type determines what the probe

sends to the real server. See Table 6-9 for the types of probes and their descriptions.

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