ZBX_TCP_READ() failed [Interrupted system call]

[Jimini]

Hey there,
I have set the following UserParameter on my Clients to let Zabbix look for available updates:

UserParameter=gentoo.updates,emerge -tpvuD world | grep ebuild | wc -l

This works fine, just for one single system the server logs the following error:

Item [Aleph:gentoo.updates] error: Get value from agent failed: ZBX_TCP_READ() failed [Interrupted system call]
Zabbix Host [Aleph]: another network error, wait for 15 seconds

The agent on Aleph does not log any errors.

On the Zabbix server, I use 1.8.4, on Aleph 1.8.3. I also tested 1.8.4 and 1.9.3, but without success.

Here are the configs:
Zabbix server

StartPollers=10
StartTrappers=5 # I also tried up to 200 here
StartPingers=2
ListenPort=10051
SourceIP=10.0.0.2
ListenIP=10.0.0.2
HousekeepingFrequency=1
SenderFrequency=60
DebugLevel=3
Timeout=30
TrapperTimeout=60
UnreachablePeriod=60
PidFile=/var/run/zabbix/zabbix_server.pid
LogFile=/var/log/zabbix/zabbix_server.log
AlertScriptsPath=/home/zabbix/bin/
DBHost=localhost
DBName=(secret)
DBUser=(secret)
DBPassword=(secret)

Zabbix agent

Server=10.0.0.2
ServerPort=10051
Hostname=Aleph
ListenPort=10050
ListenIP=10.0.0.1
SourceIP=10.0.0.1
StartAgents=5 # I tried up to 16 here
DebugLevel=3                                                                                      
PidFile=/var/run/zabbix/zabbix_agentd.pid
LogFile=/var/log/zabbix/zabbix_agentd.log
Timeout=30
UserParameter=gentoo.updates,emerge -tpvuD world | grep ebuild | wc -l

Any help would be really appreciated.

Best regards,
Jimini

[nelsonab]

How long does your user parameter take to execute?

The error is basically saying that the server connected to the agent, asked for an item but the item took too long and the connection timed out.

Try changing that to an active item, rather than a passive one.

[Jimini]

Thank you for your answer. The script took about 20 seconds. I replaced it as follows:

#!/bin/bash
UPDATES=`emerge -tpvuD world | grep ebuild | wc -l`
zabbix_sender -z address.of.zabbix.server -s agent's_hostname -k gentoo.updates -o $UPDATES

Now it can be executed without any errors.

Best regards,
Jimini

[anjiytwok]

Where we have to update

Hello Jimini,

Could you please guide me-

In which file we have to update the below code?

[Jimini]

anjiytwok,
I only updated a script, which looks for available updates on a Gentoo system.
The reason was, that the line in zabbix_agentd.conf took too long to bring a result, so I put everything into a script and delivered it to the Zabbix server by using zabbix_sender.

Best regards,
Jimini

[alin.ilie]

Hi Jimini,

I'm having the exact same issue with one of my scripts. It takes around 5-6 seconds to show the result. Never thought of using zabbix sender till now. One question though, can you please tell me how did you configured the item in the dashboard?

Thank you.

[alin.ilie]

Hi Jimini,

I'm having the exact same issue with one of my scripts. It takes around 5-6 seconds to show the result. Never thought of using zabbix sender till now. One question though, can you please tell me how did you configured the item in the dashboard?

Thank you.

OK, scratch that. I've solved this by creating a Zabbix Item with the type Zabbix trapper. Easy. Then I'm sending my data (a simple response code from an HTTP check) by calling the zabbix sender like so:

zabbix_sender -c /usr/local/etc/zabbix_agentd.conf -k gsc.state -o $RESPONSE_CODE

This is part of the script, as Jimini suggested:

#!/bin/bash
RESPONSE_CODE=`/home/ailie/./gsc State`
zabbix_sender -c /usr/local/etc/zabbix_agentd.conf -k gsc.state -o $RESPONSE_CODE

This works perfectly. I'm calling my script from the command line and it sends the response code into the Zabbix dashboard.

Now, the problem is that I want to receive periodic updates with the response code WITHOUT using a cronjob.

Is there any way to get this into the UserParameter in the zabbix_agentd.conf file?

I've tried creating another item, this time of type agent, gave it a key, and set this in the zabbix_agentd.conf

UserParameter=calling.sender,/home/ailie/gsc_sender \$1

It does absolutely nothing.

I'm sure I'm missing something here, there has to be a way to call the sender periodically, otherwise (calling it only manually) makes very little sense to me.

Thank you.

Alin.

[Jimini]

alin.ilie,

simply select "Zabbix trapper" as the type of the item.

Best regards,
Jimini

P.S.: Zabbix sender is ideal to collect some data at a fixed moment or for events like a completed task (e.g. virus scanning).

[Jimini]

Now, the problem is that I want to receive periodic updates with the response code WITHOUT using a cronjob.

Is there any way to get this into the UserParameter in the zabbix_agentd.conf file?

I've tried creating another item, this time of type agent, gave it a key, and set this in the zabbix_agentd.conf

It does absolutely nothing.

I'm sure I'm missing something here, there has to be a way to call the sender periodically, otherwise (calling it only manually) makes very little sense to me.

Thank you.

Alin.

Alin,

you could try adding the "Timeout" parameter to zabbix_agentd.conf, like

Timeout=30

(must be between 1 und 30)

Best regards,
Jimini

[alin.ilie]

Jimini,

Thank you very much for this suggestion. I've set the timeout to 30 seconds to both the agent and the server in their respective .conf files and it works like a charm.

Thank you.