Checking disk space for tmpfs Nagios

Question

Here is the result of df on my target computer ~# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vgsys-lvroot 11G 5.4G 5.0G 52% / udev 24G 4.0K 24G 1% /dev tmpfs 4.0G 256K 4.0G 1% /tmp tmpfs 4.8G 6.1M 4.7G 1% /run none 5.0M 0 5.0M 0% /run/lock none 24G 0 24G 0% /run/shm /dev/mapper/vgsys-lvopt 30G 25G 4.8G 84% /opt /dev/sda1 226M 71M 144M 34% /boot

And the result of the polling via snmp from my nagios poller:

 # ./check_snmp_storage.pl -H 172.x.x.x -v 1 -C public -m tmpfs -w 80 -c 90
Filter : tmpfs
OID : 1.3.6.1.2.1.25.2.3.1.3.8, Desc : Shared memory
OID : 1.3.6.1.2.1.25.2.3.1.3.35, Desc : /opt
OID : 1.3.6.1.2.1.25.2.3.1.3.6, Desc : Memory buffers
OID : 1.3.6.1.2.1.25.2.3.1.3.1, Desc : Physical memory
OID : 1.3.6.1.2.1.25.2.3.1.3.33, Desc : /dev
OID : 1.3.6.1.2.1.25.2.3.1.3.32, Desc : /sys/fs/fuse/connections
OID : 1.3.6.1.2.1.25.2.3.1.3.36, Desc : /boot
OID : 1.3.6.1.2.1.25.2.3.1.3.7, Desc : Cached memory
OID : 1.3.6.1.2.1.25.2.3.1.3.3, Desc : Virtual memory
OID : 1.3.6.1.2.1.25.2.3.1.3.10, Desc : Swap space
OID : 1.3.6.1.2.1.25.2.3.1.3.31, Desc : /
storages selected : 0
Unknown storage : tmpfs : ERROR

As you can see, the tmpfs filesystems are not showed in SNMP. (but I tried without hope (neither success) "-m tmp", "-m /tmp")

Is it possible ?

Someone know a plugin to monitor a tmpfs filesystem ?

Thanks

Answer 1

This isn't the fault of check_snmp_storage.pl. Oddly, the hrStorage branch includes types for "RamDisk" (hrStorageTypes 8), but an snmpwalk confirms what you are seeing: it ignores tmpfs mounts.

According to the usage documentation, you can explicitly (try to) force the script to check RamDisk storage using -q RamDisk.

You can use the standard check_disk plugin with the NRPE agent to check tmpfs mounts, though.