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Putnik
Asked: 2016-12-08 00:17:39 +0800 CST

how to debug/troubleshoot collectd?

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I have an issue with custom script using exec plugin. From shell the script works well and nothing useful in /var/log/collectd.log.

LoadPlugin logfile
<Plugin logfile>
        LogLevel info
        File "/var/log/collectd.log"
        Timestamp true
        PrintSeverity true
</Plugin>

How can I debug/troubleshoot it? In the doc I found an example

-> | PUTVAL "testhost/interface/if_octets-test0" interval=10 1179574444:123:456
<- | 0 Success

But how can I run it, how can I pass my PUTVAL to collectd? The collectd does not listen any port (all the other plugins work well and send data to graphite).

Just to be clear: the problem is not to see the generated string but to make sure the particular string will be accepted.

Thank you.

p.s. the particular issue: the script returns dozens of values but one of them only get to graphite.

troubleshooting debugging collectd

2 Answers

  1. Your custom script should use the text protocol you mentions by wrting commands to stdout. You can find a very simple example in the docs : https://collectd.org/wiki/index.php/Plugin:Exec

    echo "PUTVAL \"$HOSTNAME/exec-magic/gauge-magic_level\" interval=$INTERVAL N:$VALUE"

    Basically, your script should only write PUTVAL commands to stdout (and nothing else) to submit values.

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  2. Stopping the service, and manually running check_capability -f displays errors that do not get printed to the log file.

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