custom script.. where is the problem?

[michu]

hey all

well i created a nice script, which returns me the % of used space of a disk..
i saved it in /opt/zabbix/hd_voll:
----------------------------------------------------
#!/bin/bash
host=$1
disk=$2

mulfix=1000000000 #because bash dosnt know floats...

SUSED=$(snmpget -P e -O q $host public host.hrStorage.hrStorageTable.hrStorageEntry.hrSto rageUsed.$disk | cut -f2 -d" )
STOTAL=$(snmpget -P e -O q $host public host.hrStorage.hrStorageTable.hrStorageEntry.hrSto rageSize.$disk | cut -f2 -d ")

#echo "tot: $STOTAL"
#echo "use: $SUSED"

if [ "$STOTAL" = "0" ]
then printf 'ERROR\n'
else
if [ "$STOTAL" = "" ]
then printf 'ERROR\n'
exit 1;
fi
divres=$((100 * $mulfix / $STOTAL))
resultm=$(($divres * $SUSED))
resultUnrounded=$(($resultm / ($mulfix/10))) # a primitive rounding algo...
resultUnroundedA=$(($resultUnrounded + 5))
result=$(($resultUnroundedA /10))
echo $result
----------------------------------------------------
when i run it from the command line, it workss fine:

abcmgmt:/ # /opt/zabbix/hd_voll server01 4
66

so i edited /etc/zabbix/agentd.conf, i changed the following:

a) increased the timeout
# Spend no more than Timeout seconds on processing
# Must be between 1 and 30

Timeout=30

b)added the user parameter
UserParameter=DiskFree[SERVER01],/opt/zabbix/hd_voll server01 4

now i restartet zabbix...

in the web interface, i add a new item, type is "zabbix_agent" and the key i enter is "DiskFree[SNFSERVER01]", status "monitored", type of information is "numeric"...

the host is monitored and working fine (other snmp items)... but my script never gets checked... output from latest values:
DiskFree - - - Graph Trend Compare

no errors... any hints?

ps i testet it on zabbix v1.0 and v1.1a2

regards
michael

[johnl]

have a look at following post.

http://www.zabbix.com/forum/showthread.php?t=700&highlight=unsupported

you could create cron job to run the script and output value to file and then get zabbix to reference this file. that way you dont have to worry about time scripts take to execute, zabbix permissions to execute scripts etc.

regards,
john

[michu]

thanks johnl for your quick reply...

well i did it the way you desc.

a) the script is called from a cron job, a file is generated in /opt/zabbix/disk/server014

in zabbix_Agentd.conf i added the following user parameter

UserParameter=DiskFree[SERVER014],cat /opt/zabbix/disk/server014

restart zabbix... now the suckerd.log file show this:

018116:20050525:110928 Got empty string from [server01]. Parameter [DiskFree[SERVER014]]
018116:20050525:110928 Assuming that agent dropped connection because of access permissions
018116:20050525:110928 Got empty string from [server01]. Parameter [DiskFree[SERVER014]]
018116:20050525:110928 Assuming that agent dropped connection because of access permissions
018116:20050525:110928 Got empty string from [server01]. Parameter [DiskFree[SERVER014]]
018116:20050525:110928 Assuming that agent dropped connection because of access permissions


i also created a script which does the cat /opt/zabbix/disk/server014 and set the suid.. still the same error!?

perhaps im calling the parameter wrong.. just to be sure:

agentd.conf:
UserParameter=DiskFree[SERVER014],cat /opt/zabbix/disk/server014

on a host i add the following.. (type: zabbix_agent) and key is DiskFree[SERVER014]

any ideas?

thanks in advance
michael

[Alexei]

Are you sure your script finds snmpget and other external binaries? You do not have full path to the binaries...

[michu]

yes... snmpget is not needed anymore, as i create a text file with via cron job... this means i ve a text file with "44\n" in it...

and a /bin/cat should execute everyone... on the textfile itself everyone has read permission...

2 questions

a) when i use a custom script, i had to declare the item as "zabbix_agent", right?
b) the zabbix agent is just running on the server itself, the other (win) hosts are checked with snmp... so when i create the item, which wants to read the text file, the item needs to specified under the server-host (which runns the agent) or dosnt matter?

regards
michael

[johnl]

so the cron job returns a value to a file eg 1. if you cat this file it should give you

cat file
1

zabbix then needs to have permission to read the contents of this file. your parameters look ok. check that cat file gives you what you think it should and make sure zabbix can read the file.

your userparameter and item look ok. once you get to the point where zabbix can read the value that is in your file. you need to change cron to mv this file to another file name as the cron job momentarily sets file to empty which will trip zabbix agent to unsupported. let me know if you have any problems. this is example of what we use

created cron entry for zabbix user
* * * * * path/script | mv path/outputfile.tmp path/outputfile

then userparameter in agentd (dont forget to restart zabbix agent after making entry)
UserParameter=server[test],cat path/outputfile

item is then
server[test]

regards,
john

[michu]

hey johnl

everything is set up right... and a cat is working as expectet...(with the newline) the mv problem issue is solved as alexei wrote in your thread...

now

>then userparameter in agentd (dont forget to restart zabbix agent after making entry)
>UserParameter=server[test],cat path/outputfile

>item is then
>server[test]

but on which host i add now this new item.. on localhost (where the file is and zabbix runns) or, on the server it monitors... or it dosnt matter? well i tried both... without success...

the status of the item is "Not supported"... which looks like he gets a empty string back...

i increased the debugging to 4... but there are not alot of informations:

019320:20050525:115129 zabbix_agentd started
019321:20050525:115129 zabbix_agentd 19321 started
019322:20050525:115129 zabbix_agentd 19322 started
019323:20050525:115129 zabbix_agentd 19323 started
019324:20050525:115129 zabbix_agentd 19324 started
019325:20050525:115129 zabbix_agentd 19325 started



... im running out of ideas ;)

regards
michael

[johnl]

cant think what could be wrong. i know that when i was trying to get userparameter and script to work it took me a little time (my being stupid didnt help :) . do the following

create a file called file1
put a value of 1 in this file
create userparameter to check reference this file using cat
create item on zabbix using userparameter
set item to monitored.

you should be able to see this under your latest data, if not something wrong with zabbix. if this works then check your steps for current problem.

[michu]

hey johnl... thanks again for your support... i think i missed 2 important steps:

1) i need to add the items on the LOCALHOST (=where zabbix runns)
2) restart ALL 3 tasks (suckerd/agentd/trapperd)...

regards