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During the last two months I have been setting up Nagios as a side project. We have a lot of new customers coming in and we need to have a tight grip on our systems to satisfy service levels. So as I set up a Debian host to run Nagios on and was making progress in adding systems, I encountered several issues.
One of them was the fact that I need to monitor several tcp ports that are utilized in the applications we are running in a JBoss container. The default script in Nagios to monitor a tcp-port works well and I have used it to create a custom plugin to monitor several ports sequentially.
I have defined a service for this in Nagios and you can see this service is applied to a particular host group:
define service {
hostgroup_name dme-servers
servicegroups DME_DIENSTVERLENING
service_description check_tcp_ports
check_command check_tcp_multiport!1098,1099,4444,5011,5021
use generic-service
}Below is the code I have put in
/usr/lib/nagios/plugins/check_tcp_multiport.pl
| perl | | copy code | | ? |
| 01 | |
| 02 | #!/usr/bin/perl -w |
| 03 | use strict; |
| 04 | use Getopt::Long; |
| 05 | my ($plugin_home,$hostname,$ports); |
| 06 | $plugin_home = "/usr/lib/nagios/plugins/"; |
| 07 | getoptions(); |
| 08 | |
| 09 | sub getoptions |
| 10 | {
|
| 11 | my @ports; |
| 12 | my $error_count = 0; |
| 13 | my $error_ports =""; |
| 14 | |
| 15 | my $result=GetOptions |
| 16 | ( |
| 17 | "h|host=s"=>\$hostname, |
| 18 | "p|port=s" => sub |
| 19 | {
|
| 20 | $ports = pop, |
| 21 | @ports = split(/,/,$ports) |
| 22 | }, |
| 23 | ); |
| 24 | |
| 25 | foreach my $port (@ports) |
| 26 | {
|
| 27 | my $output = `$plugin_home/check_tcp -H $hostname -p $port`; |
| 28 | my $exit_code = $?; |
| 29 | chomp($output); |
| 30 | if ($exit_code != 0) |
| 31 | {
|
| 32 | $error_count++; |
| 33 | $error_ports .= "$port,"; |
| 34 | } |
| 35 | } |
| 36 | |
| 37 | if ( $error_count == 0) |
| 38 | {
|
| 39 | print "All ports are OK on $hostname\n"; |
| 40 | exit 0; |
| 41 | } |
| 42 | chop($error_ports); |
| 43 | print "There are $error_count errors on $hostname: $error_ports\n"; |
| 44 | exit 2; |
| 45 | } |
| 46 | |
| 47 | |
| 48 |