User manual

The WebMux™ Model 480S, 580SG, and 680PG User Guide – Version 7.0.x

Appendix 5 – Sample Custom CGI Code

The custom cgi-bin checking program may be written in Java, VB, C, or Perl, for

example, or it may be a WB or shell script. Here is sample script written for the

linux shell bash which sees if an SSH daemon is running as its check criterion.

#!/bin/bash

echo "Content-type: text/plain"

echo # blank line

if ps -C sshd &>/dev/null ; then

echo "OK" # response from server goes here, see list below.

echo "SSH service available"

else

echo "NOT OK"

echo "SSH daemon not running"

The following is a list of valid CGI code responses:

OK - server is alive, no weight change

OVERLOAD - set weight to 0, to quiesce (same as “WEIGHT=0”)

QUIESCE - set weight to 0, to quiesce (same as “WEIGHT=0”)

WEIGHT=n - set weight to integer n

WEIGHT-=n - subtract integer n from the weight

WEIGHT+=n - add integer n to the weight

The response must be in all capitals to be recognized. The changes in weight

count as an unsaved configuration change. It is not automatically saved.