NRPE: Unable to read output

[Matthew Litwin]

I wrote a perl plugin that seems to work fine when I run it locally on the
remote host as the nagios user, however when I try to execute it via NRPE I
get the old familiar nebulous ³NRPE: Unable to read output². I have
debugging on for NRPE logging and it doesn¹t tell much more. (Note this is
in reverse order is it is out of splunk. IPs are obfuscated)

Sep  3 19:27:01 sjvp00dbs001.XX.com Sep  3 19:27:01 nrpe[12434]: [ID 903583
daemon.debug] Connection from X.X.X.X closed.
host=sjvp00dbs001.XX.com Options sourcetype=syslog Options source=udp:514
Options
589/3/09 7:27:01.000 PM
Sep  3 19:27:01 sjvp00dbs001.XX.com Sep  3 19:27:01 nrpe[12434]: [ID 869297
daemon.debug] Return Code: 1, Output: NRPE: Unable to read output
host=sjvp00dbs001.XX.com Options sourcetype=syslog Options source=udp:514
Options
599/3/09 7:27:01.000 PM
Sep  3 19:27:01 sjvp00dbs001.XX.com Sep  3 19:27:01 nrpe[12434]: [ID 757686
daemon.debug] Command completed with return code 1 and output:
host=sjvp00dbs001.XX.com Options sourcetype=syslog Options source=udp:514
Options
609/3/09 7:27:01.000 PM
Sep  3 19:27:01 sjvp00dbs001.XX.com Sep  3 19:27:01 nrpe[12434]: [ID 462736
daemon.debug] Running command:
/usr/loca/nagios/libexec/check_scrub_backlog.pl -w 1000 -c 2000 -u XXXX -p
XXXX -i XXXX
Sep  3 19:27:01 sjvp00dbs001.XX.com Sep  3 19:27:01 nrpe[12434]: [ID 881351
daemon.debug] Host is asking for command 'check_scrub_backlog' to be run...
host=sjvp00dbs001.XX.com Options sourcetype=syslog Options source=udp:514
Options
629/3/09 7:27:01.000 PM
Sep  3 19:27:01 sjvp00dbs001.XX.com Sep  3 19:27:01 nrpe[12434]: [ID 385967
daemon.debug] Host address is in allowed_hosts
host=sjvp00dbs001.XX.com Options sourcetype=syslog Options source=udp:514
Options
639/3/09 7:27:01.000 PM
Sep  3 19:27:01 sjvp00dbs001.XX.com Sep  3 19:27:01 nrpe[12434]: [ID 654915
daemon.debug] Connection from X.X.X.X port 34549
host=sjvp00dbs001.XX.com Options sourcetype=syslog Options source=udp:514
Options
649/3/09 7:27:01.000 PM
Sep  3 19:27:01 sjvp00dbs001.XX.com Sep  3 19:27:01 nrpe[12434]: [ID 879649
daemon.debug] Handling the connection...

The command that is trying to run looks corrected- arguments are being sent
correctly. I have tested the command using the same user that NRPE is
running as, nagios. I did build in output for error messages in case there
were problems like issues with ENV, but obviously they are not making it to
NRPE. I confirmed my output text has EOLs. What is especially weird is that
the return code makes it back correctly but the output is just ³NRPE: Unable
to read output² even as logged by nrpe.

The output should look like this, which is what it gets locally when ran:
Scrub Backlog Count: 1083

Nothing unusually with that, right?

Any help appreciated, thanks.



Does anyone have any other suggestions on how I might debug this? Since NRPE
is working for all my other plugins
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