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Changing the length of the plugin output in Nagiosxi
Posted: Thu Jun 02, 2011 7:53 am
by arnab.roy
Hi ,
I am trying to monitor a number of wireless access points the output of the plugin looks like this
OK AP-Khipu-Comms-Room Clients-0 OK AP-Khipu-South-Africa-Office Clients-0 OK AP-Khipu-South-Africa-Office Clients-0 OK AP-Khipu-Board-Room Clients-5 OK AP-Khipu-Board-Room Clients-5 OK AP-Khipu-MiltonKeynes-Office Clients-0 OK AP-Khipu-Remote-Backup Clients-0 OK AP-Khipu-Technical Clients-4 |Khipu-Comms-Room1=0;25;30;0; Khipu-South-Africa-Office2=0;25;30;0; Khipu-South-Africa-Office3=0;25;30;0; Khipu-Board-Room4=5;25;30;0; Khipu-Board-Room5=5;25;30;0; Khipu-MiltonKeynes-Office6=0;25;30;0; Khipu-Remote-Backup7=0;25;30;0; Khipu-Technical8=4;25;30;0;
Nagios is obviously chopping the output off and processing 4k, in the opensource version this value can be modified at compile time is their a way we can increase this in NagiosXI.
Many Thanks
Arnab
Re: Changing the length of the plugin output in Nagiosxi
Posted: Thu Jun 02, 2011 9:32 am
by tonyyarusso
You would need to do the same process, recompiling Core underneath.
Re: Changing the length of the plugin output in Nagiosxi
Posted: Thu Jun 02, 2011 11:18 am
by arnab.roy
I am afraid I will end up breaking the whole thing, as I am not very sure how the core and xi frontend talks to each other ...
it would be great if some kind of step by step process is provided, many thanks
Arnab
Re: Changing the length of the plugin output in Nagiosxi
Posted: Thu Jun 02, 2011 11:34 am
by tonyyarusso
Start with the
Upgrade Instructions. After you have unpacked the update tarball and before you run the upgrade script, create a patch file in /tmp/nagiosxi/subcomponents/nagioscore/patches/ with your changes and add it to /tmp/nagiosxi/subcomponents/nagioscore/apply-patches, then run the upgrade script and proceed as usual. (This assumes you know how to make a patch file - there are other more direct but less "correct" ways to do this that will work too.)
Re: Changing the length of the plugin output in Nagiosxi
Posted: Thu Jun 02, 2011 1:18 pm
by arnab.roy
hi tony thanks for that , unfortunately we have some customization and integration with netdisco which will get blown if I run the upgrade script. we usually recopy the modified php s when we upgrade . so if you can suggest some alternatives that would be great
Re: Changing the length of the plugin output in Nagiosxi
Posted: Thu Jun 02, 2011 1:36 pm
by tonyyarusso
You could try tracking down which file(s) get modified by that option and figuring out how to compile just those I guess, although that would be a bit tedious. You really should separate out any customizations in a way that will be either saved or easily replaceable on an upgrade though, since you'll need to keep the software up to date anyway.
Re: Changing the length of the plugin output in Nagiosxi
Posted: Thu Jun 02, 2011 2:35 pm
by arnab.roy
hi tony ok I think we will go the upgrade way can you give an example of the patch file which will modify the value in the header file thanks s lot for your help
Re: Changing the length of the plugin output in Nagiosxi
Posted: Thu Jun 02, 2011 3:26 pm
by tonyyarusso
Here you go:
Code: Select all
[root@demo nagioscore]# pwd
/tmp/nagiosxi/subcomponents/nagioscore
[root@demo nagioscore]# cat patches/output-length.patch
diff -rau nagios-3.2.3/include/common.h /root/nagios-3.2.3/include/common.h
--- nagios-3.2.3/include/common.h 2010-10-03 22:56:55.000000000 -0500
+++ /root/nagios-3.2.3/include/common.h 2011-06-02 15:15:56.000000000 -0500
@@ -471,7 +471,7 @@
#define MAX_FILENAME_LENGTH 256 /* max length of path/filename that Nagios will process */
#define MAX_INPUT_BUFFER 1024 /* size in bytes of max. input buffer (for reading files, misc stuff) */
#define MAX_COMMAND_BUFFER 8192 /* max length of raw or processed command line */
-#define MAX_EXTERNAL_COMMAND_LENGTH 8192 /* max length of an external command */
+define MAX_EXTERNAL_COMMAND_LENGTH 16384 /* max length of an external command */
#define MAX_DATETIME_LENGTH 48
diff -rau nagios-3.2.3/include/nagios.h /root/nagios-3.2.3/include/nagios.h
--- nagios-3.2.3/include/nagios.h 2008-12-14 08:52:23.000000000 -0600
+++ /root/nagios-3.2.3/include/nagios.h 2011-06-02 15:15:44.000000000 -0500
@@ -43,7 +43,7 @@
of MAX_EXTERNAL_COMMAND_LENGTH in common.h to allow for passive checks results received through the external
command file. EG 10/19/07
*/
-#define MAX_PLUGIN_OUTPUT_LENGTH 8192 /* max length of plugin output (including perf data) */
+define MAX_PLUGIN_OUTPUT_LENGTH 16384 /* max length of plugin output (including perf data) */
[root@demo nagioscore]# cat apply-patches
#!/bin/sh
pkgname=$1
# Apply our patches
echo "Applying Nagios XI patches to Nagios Core..."
# Already in Nagios Core 3.2.3
#patch $pkgname/base/events.c < patches/nagios-schedulingstatus.patch
patch $pkgname/cgi/Makefile.in < patches/cgi-makefile.patch
patch $pkgname/base/checks.c < patches/nagios-passivehostcheckbroker.patch
patch $pkgname/base/checks.c < patches/nagios-passivehoststatusupdate.patch
patch -p0 < patches/output-length.patch
# Custom CGIs
cp patches/cgi/*.c $pkgname/cgi
[root@demo nagioscore]#