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Several Servers hidden behind single IP
Posted: Fri Oct 07, 2011 5:27 am
by tkircht
We have several customers that hide more than one (Windows/NSClient++) server behind one single IP-address. What I usually do in these cases is forward increasing port numbers to those hosts (12489-> HostA, 12490->HostB, 12491->HostC, etc.). On the Nagios side I need to create a service definition for every combination of portnumber and service ( one for CPULOAD at 12489, CPULOAD at 12490, etc.) which tends to fill the service-definitions-file with a bunch of definition entries.
Can anybody stir me towards a better (i.e. more readable and manageable) setup for this problem? I'd love a way to pass the port number to the host definition and use a generic definition for each service. I feel like I could add the port number to the host address (12.34.56.78:1290) but am at a loss on how to parse this in the command definition.
Any ideas for me there?
Thanks for any hints!
Thomas
Re: Several Servers hidden behind single IP
Posted: Fri Oct 07, 2011 8:17 am
by tkircht
I guess I solved it myself - was rather straightforward even. Just in case anyone needs this... Feel free to comment if you see something you don't like...
Parser script:
Code: Select all
1 #!/bin/bash
2 # check_parse_nt
3 # parses socket and executes check_nt
4 # Thomas Kirchtag 2011
5
6 #
7 FULLADDRESS="${1}"
8 shift
9
10 IPADDRESS="${FULLADDRESS%:*}"
11 PORTNUMBER="${FULLADDRESS#*:}"
12 CHECK_NT="/usr/lib/nagios/plugins/check_nt"
13 $CHECK_NT -H "${IPADDRESS}" -p "${PORTNUMBER}" "$@"
command definitions:
Code: Select all
define command {
command_name check-nt-variable
command_line $USER1$/check_parse_nt $HOSTADDRESS$ -v $ARG1$ $ARG2$
}
define command {
command_name check-host-alive-nt-variable
command_line $USER1$/check_parse_nt $HOSTADDRESS$ -v CLIENTVERSION $ARG1$ $ARG2$
}
Host template:
Code: Select all
# Generic NSClient-Host
define host{
use generic-host;
name nsclient-host-variable ; The name of this host template
check_command check-host-alive-nt-variable!CLIENTVERSION! -p12490 -s Password
hostgroups windows-servers,NSClient-Servers-variable
register 0 ;
}
Sample host definition:
Code: Select all
define host {
use nsclient-host-variable;
host_name 0000-002-IP-W2K8R2-03;
address 123.45.67.17:12490;
check_command check-host-alive-nt-variable
}
Service template:
Code: Select all
define service {
use generic-service
name nsclient-service
notification_interval 0 ; set > 0 if you want to be renotified
max_check_attempts 3
register 0
}
Sample service definition:
Code: Select all
define service {
use nsclient-service
hostgroup_name NSClient-Firewall-2K8-variable
service_description Firewall
check_command check-nt-variable!SERVICESTATE!-l 'MpsSvc' -s Password
}
Re: Several Servers hidden behind single IP
Posted: Sun Oct 09, 2011 9:39 pm
by JenyZ
I actually found this very helpful....kinda a newbie with php, talk about mind boggling, but am enjoying all the techie language!
Re: Several Servers hidden behind single IP
Posted: Mon Oct 10, 2011 9:29 am
by tkircht
Well, seeing that somebody (Hi Jeny!) is actually reading this I have to admit that I threw that solution into the garbage bin already. The clean way to solve this problem of course uses user-defined macros and good host templates. I now have all my host specific information like port numbers, urls etc in my host definitions and address these macros from within my command.cfg. Just a small sample - tell me if you need more:
Code: Select all
define host {
use nsclient-host-variable;
host_name 0000-002-IP-W2K8R2-03;
address 12.34.56.17;
_NSCP_PORT 12490;
_NSCP_PW topsecret;
check_command check-host-alive-nt-variable
hostgroups +NSClient-AD-2K8,NSClient-Firewall-2K8
}
Code: Select all
define command {
command_name check-nt-variable
command_line $USER1$/check_nt -H $HOSTADDRESS$ -p $_HOSTNSCP_PORT$ -s $_HOSTNSCP_PW$ -v $ARG1$ $ARG2$
}