Comment 0 for bug 1843036

It has been brought to me the following:

Some hosts have started to cause UNKNOWN return values in Nagios for checks on their disks. This is because these hosts are no longer reporting their disks as part of the SNMP table hrStorageTable (1.3.6.1.2.1.25.2.3.1 ) - only memory devices are being reported. The affected hosts that I have investigated received updates for SNMP:

Upgrade package libsnmp-base 5.7.3+dfsg-1.8ubuntu3.1 to 5.7.3+dfsg-1.8ubuntu3.2
Upgrade package libsnmp30 5.7.3+dfsg-1.8ubuntu3.1 to 5.7.3+dfsg-1.8ubuntu3.2
Upgrade package snmpd 5.7.3+dfsg-1.8ubuntu3.1 to 5.7.3+dfsg-1.8ubuntu3.2

It seems likely that this package update is the cause.

As debug info, you can see the difference between 2 nearly identical servers, one of which received the SNMP updates, and one which did not. You can see that the one without the update is returning disks in the SNMP output:

# snmpwalk -v2c -cpublic arcprsmt01 1.3.6.1.2.1.25.2.3.1.3
iso.3.6.1.2.1.25.2.3.1.3.1 = STRING: "Physical memory"
iso.3.6.1.2.1.25.2.3.1.3.3 = STRING: "Virtual memory"
iso.3.6.1.2.1.25.2.3.1.3.6 = STRING: "Memory buffers"
iso.3.6.1.2.1.25.2.3.1.3.7 = STRING: "Cached memory"
iso.3.6.1.2.1.25.2.3.1.3.8 = STRING: "Shared memory"
iso.3.6.1.2.1.25.2.3.1.3.10 = STRING: "Swap space"
iso.3.6.1.2.1.25.2.3.1.3.31 = STRING: "/"
iso.3.6.1.2.1.25.2.3.1.3.37 = STRING: "/run"
iso.3.6.1.2.1.25.2.3.1.3.39 = STRING: "/dev/shm"
iso.3.6.1.2.1.25.2.3.1.3.40 = STRING: "/run/lock"
iso.3.6.1.2.1.25.2.3.1.3.41 = STRING: "/sys/fs/cgroup"
iso.3.6.1.2.1.25.2.3.1.3.67 = STRING: "/run/snapd/ns"
iso.3.6.1.2.1.25.2.3.1.3.70 = STRING: "/var/lib/docker/containers/3cad3d36991b677c37b08b374a7bfeceddf36a6b6754edaa1ff687b00111a6b8/mounts/shm"
iso.3.6.1.2.1.25.2.3.1.3.73 = STRING: "/var/lib/docker/containers/c605c4b76dea65d562ba024212a38e24fb710186c499187b6604478b7ff678e9/mounts/shm"
iso.3.6.1.2.1.25.2.3.1.3.82 = STRING: "/run/user/2002"
iso.3.6.1.2.1.25.2.3.1.3.253 = STRING: "/var/lib/docker/containers/dc74a157fbaaa284e0e5b8ca4afc88769bf625eb796d89a5d26f98a540cabf35/mounts/shm"
iso.3.6.1.2.1.25.2.3.1.3.256 = STRING: "/var/lib/docker/containers/6ce6193433f9c1c95cccbfbbe08a3f3385bdbc4f2e3f0baa02d11baf3866dfd2/mounts/shm"
iso.3.6.1.2.1.25.2.3.1.3.258 = STRING: "/run/user/1000"

The other, which received SNMP updates, is returning only memory devices, such as swap and shmem:

# snmpwalk -v2c -cpublic arcprsmt02 1.3.6.1.2.1.25.2.3.1.3
iso.3.6.1.2.1.25.2.3.1.3.1 = STRING: "Physical memory"
iso.3.6.1.2.1.25.2.3.1.3.3 = STRING: "Virtual memory"
iso.3.6.1.2.1.25.2.3.1.3.6 = STRING: "Memory buffers"
iso.3.6.1.2.1.25.2.3.1.3.7 = STRING: "Cached memory"
iso.3.6.1.2.1.25.2.3.1.3.8 = STRING: "Shared memory"
iso.3.6.1.2.1.25.2.3.1.3.10 = STRING: "Swap space"