External Check works once then says not supported

[omicron]

Hello,

I am having a problem trying to get the fan speed in my bladecenter.

I first tried to use SNMP but the problem is that the value returned is a string (which contains characters). So, I can't use it to graph or trigger on this item.

I then decided to use external check, with a script containing the SNMP querry. That script is parsing the result of the query in order to get only the numeric value I need, and not the rest.
And it works! ... but just once.

After the value is displayed once on the frontend, the second time the external check is executed, the item disables itself (it is marked as "not supported") and says that my script "returned nothing".

Here is my script :

#!/bin/sh

 TEST=$(/usr/bin/snmpget -v1 -c public 10.202.200.1 .1.3.6.1.4.1.2.3.51.2.2.3.1.0 | /bin/sed "s/[^0-9]//g");
         
          
        function test(){   
                
                declare -i TEST2=${TEST:10};

                return $((TEST2)); 

        }
    
        test;

In that script,

snmpget -v1 -c public 10.202.200.1 .1.3.6.1.4.1.2.3.51.2.2.3.1.0

returns the following as a string:

SNMPv2-SMI::enterprises.2.3.51.2.2.3.1.0 = STRING: "46% of maximum"

Once the script is executed, I get the value I need (in my exemple, it is 46).

I already tried to change the Timeout value in the zabbix-server config file setting it to 30, but it didn't work.

Help on this issue would be much appreciated

[alixen]

Hi,

Have you tried to simplify your script ?

I think that the script below should work

#!/bin/sh
/usr/bin/snmpget -v1 -c DLNEGOCE 10.202.200.1 .1.3.6.1.4.1.2.3.51.2.2.3.1.0 | /bin/sed "s/[^0-9]//g"

Regards,
Alixen

[omicron]

Thank you for your answer.

It tried as you said, and it works, except what I get is "223512231046" instead of 46. Indeed, as you can see in the following, there's 10 digits before 46:

SNMPv[B][I]2[/I][/B]-SMI::enterprises.[B][I]2.3.51.2.2.3.1.0[/I][/B] = STRING: "46% of maximum"

That was why I had to substring the SNMP string in my script.

Can you help me adapt your script to retrieve only the digits after the 10 firsts?

[omicron]

I managed to modify the script you gave me to suit my needs.
It seems to work.

Here is the script :

#!/bin/sh
snmp_string=$(/usr/bin/snmpget -v1 -c public 10.202.200.1 .1.3.6.1.4.1.2.3.51.2.2.3.1.0 | /bin/sed "s/[^0-9]//g");
echo ${snmp_string:10};

Again, thank you Alixen for your help!

[omicron]

One more thing please:

I would like to pass the snmp oid as a parameter.
I tried the following:

#!/bin/sh

snmp_string=$(/usr/bin/snmpget -v1 -c public 10.202.200.1 $1 | /bin/sed "s/[^0-9]//g");

echo ${snmp_string:10};

(I also tried $2 instead of $1 as seen on other posts).

On the frontend, I changed the item as in the following:

script.sh[.1.3.6.1.4.1.2.3.51.2.2.3.1.0]

It didn't work. I have the same problem as with my previous script.

It seems like I am not getting the parameter in the $1 (or $2) variable.
This was working perfectly with the snmp oid directly inserted in the script (without the variable).
What did I do wrong? Can you help me?

[alixen]

Hi,

External scripts get your arguments starting from $2, $1 is Zabbix host name.
Check the manual for details : http://www.zabbix.com/documentation/...xternal_checks

Using -Ov option of snmpget would also help parsing the result since it removes OID part:

#! /bin/sh
/usr/bin/snmpget -v1 -c $3 -Ov $1 $2 | /bin/sed "s/[^0-9]//g"

You could then call it as:

script.sh[.1.3.6.1.4.1.2.3.51.2.2.3.1.0 DLNEGOCE]

Regards,
Alixen

[omicron]

Here is my new script:

#!/bin/sh

snmp_string=$(/usr/bin/snmpget -v1 -c public -Ov $1 $2 | /bin/sed "s/[^0-9]//g");

echo $snmp_string;

... But it didn't change anything (I'm still having the "not supported" error).
I really don't get why it's always working the first time, and then ... nothing.
It's really weird.

Any other idea?

[alixen]

Hi,

I suggest to add some debug messages to your script, it may give you a clue about what is going wrong.
I would start with:

#!/bin/sh
LOG=/tmp/script.log
echo start: $0 `date` >> $LOG
echo args: $* >> $LOG

snmp_string=$(/usr/bin/snmpget -v1 -c public -Ov $1 $2 | /bin/sed "s/[^0-9]//g");

echo $snmp_string;

echo snmp_string: $snmp_string >> $LOG
echo end: $0 `date` >> $LOG

Regards,
Alixen

[omicron]

Thank to your help I finally managed to determine what was the problem.

Indeed, when I'm executing the script by hand it's writting some info in the log file, whereas when it's executed by zabbix,there is no log entry.

So I looked carefully to the chmod and modified them.

Now it's working perfectly.

But I still don't get why it was always working the first time, and then nothing ... strange.

But my problem is solved.

Thank you Alixen, and sorry for having wasted your time.

[matjing]

external check works only for first argument

I am running zabbix 2.0. and for external checks I have the following:

#!/bin/sh
LOG=/tmp/zabbix_external.log
echo start: $0 `date` >> $LOG
echo args: $* >> $LOG

ttl=$(snmpwalk -v 2c -c wrongcomm 41.222.XX.XX ifOutOctets.$1  | awk '{print$4}');

echo $ttl;

echo ttl: $ttl >> $LOG
echo end: $0 `date` >> $LOG

the log files show the following:

start: /usr/local/share/zabbix/externalscripts/zabbix_external.sh Sun Jun 17 16:51:32 EAT 2012
args: 503
ttl: 8348368
end: /usr/local/share/zabbix/externalscripts/zabbix_external.sh Sun Jun 17 16:51:32 EAT 2012
start: /usr/local/share/zabbix/externalscripts/zabbix_external.sh Sun Jun 17 16:51:37 EAT 2012
args: 939
ttl: 2914065543
end: /usr/local/share/zabbix/externalscripts/zabbix_external.sh Sun Jun 17 16:51:39 EAT 2012
start: /usr/local/share/zabbix/externalscripts/zabbix_external.sh Sun Jun 17 16:51:50 EAT 2012
args: 717
ttl: 2425176665
end: /usr/local/share/zabbix/externalscripts/zabbix_external.sh Sun Jun 17 16:51:50 EAT 2012

On the gui I configured ->numeric unsigned, decimal,multiplier = 8, and units as bps.

However only the first one with args 939 registers any value on the front end for graphing. It also happens to be the first one I configured.

when checking the GUI,

 
history: Configuration of items » Latest data » Configuration of hosts » Configuration of items » Latest data

there are converted values for the one then zeros for all the others. On one I can see a value was picked once then it all went back to the zeroes.

If I try running multiple scripts one for each OID, again the first one works, the others all become 'not supported'
[code]
15817:20120615:211432.166 item [Zabbix server:ifOut.939] became not supported: Received value [IF-MIB::ifInOctets.939 = C
ounter32: 1068503185] is not suitable for value type [Numeric (unsigned)] and data type
[code]
What could I be missing?

Mat

[matjing]

external check works only for first argument -seems to work

damn its weird when you fix/answer your own post:
I changed from the 32bit to 64bit for high speed interfaces on cisco and seem to be okay now.

#ttl=$(snmpwalk -v 2c -c wrongcom 41.222.xx,x ifOutOctets.$1  | awk '{print$4}');
ttl=$(snmpwalk -v 2c -c wrongcom 41.222.xx.x [b] ifHCInOctets[/b].$1  | awk '{print$4}');

[matjing]

external check works only for first argument

ttl=$(snmpwalk -v 2c -c wrongcom 41.222.xx.x  [B]ifHCOutOctets[/B].$1  | awk '{print$4}');

okay now I have the same (original) problem for the outbound interface. Any takers? just show's zeroes. These are virtual interfaces with traffic shaping applied