3.4.0 Matrix Server Administration Guide

Chapter 12: Configure Service Monitors 137

service if it is not already started. When the service monitor instance

becomes inactive, the monitor stops the NT service. When you configure

the monitor, you will need to indicate whether dependent services of the

NT service should also be started and stopped.

When the monitored NT service is started, it is provided with four

environment variables that are set as follows:

•

COMPUTERNAME = < virtual hostIP address>

•

_CLUSTER_NETWORK_FQDN_ = <virtual host IP address>.<domainname>

•

_CLUSTER_NETWORK_HOSTNAME_ = <virtual host IP address>

•

_CLUSTER_NETWORK_NAME_ == <virtual host IP address>

The monitor probe queries the status of the NT service. If the status is

SERVICE_RUNNING, the service status remains Up. If the status does not

indicate that the NT service is running, the service status is set to Down.

The

NTSERVICE monitor is also available as a device monitor. When

deciding whether to create a service monitor or a device monitor,

consider the effect that you want the monitor to have on the matrix. If you

want a single virtual host to be associated with the monitor, create a

service monitor. If you want multiple virtual hosts, or no virtual hosts, to

be associated with the monitor, create a device monitor.

SMTP Service Monitor

By default, the SMTP service monitor probes TCP port 25 (sendmail port)

of the virtual host address. You can change this port number to the port

number configured for your SMTP server. The default frequency of the

probe is every 30 seconds. The default time that the service monitor waits

for a probe to complete is five seconds.

The probe attempts to connect to port 25 and expects to read an initial

message from the SMTP server. This message should begin with 220. If

the probe is successful, the monitor sends the string QUIT\n to the SMTP

server. If there are no errors, the service status remains Up. If an error

occurs, the status is set to Down.