check_disk '/sys not accessable'

[Boyer, Timothy A.]

Nagios 3.3.1.  Two identical RHEL6.1 systems, and all I'm trying to do is get a total disk space reading.  So nrpe is running on both, with the identical command in nrpe.cfg:

command[check_all_disk]=/usr/lib/nagios/plugins/check_disk -w $ARG1$ -c $ARG2$
command[check_all_disk]=/usr/lib/nagios/plugins/check_disk -w $ARG1$ -c $ARG2$

Running as user nagios from the central server.

One works fine:

-sh-4.1$ /usr/lib/nagios/plugins/check_nrpe -H server1 -c check_all_disk -a 20% 10%
DISK OK - free space: / 24673 MB (98% inode=99%); /dev/shm 12007 MB (100% inode=99%); /boot 154 MB (65% inode=99%); /home 7507 MB (98% inode=99%);

the other gives me this:

-sh-4.1$ /usr/lib/nagios/plugins/check_nrpe -H server2 -c check_all_disk -a 20% 10%
DISK CRITICAL - /sys is not accessible: Permission denied

Identical versions of nrpe (2.12); a diff on check_disk shows they're both identical; both commands work correctly locally run as user Nagios:

[nagios at server1 ~)$ /usr/lib/nagios/plugins/check_disk -w20% -c10%
DISK OK - free space: / 24673 MB (98% inode=99%); /dev/shm 12007 MB (100% inode=99%); /boot 154 MB (65% inode=99%); /home 7507 MB (98% inode=99%);

[nagios at server2 /]$ /usr/lib/nagios/plugins/check_disk -w20% -c10%
DISK OK - free space: / 22004 MB (77% inode=96%); /dev/shm 498 MB (100% inode=99%); /boot 387 MB (84% inode=99%);

 Multiple other nrpe commands running on both; this is the only thing they're having problems with.

/sys is user-readable in both.  Logs show nothing.

I've run out of ideas.  Pointers in the right direction appreciated...


Tim


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