How Can I Measure Memory Utilization With SNMP

[SouperGrover]

What is the best way to calculate the amount of memory used via SNMP? I have a handful of appliances (mostly linux based) that I want to monitor memory for. I see several different memory items SNMP will give me, but I'm not sure which ones to pick

[steveboyson]

HOST-RESOURCES-MIB::hrMemorySize.0

and then these:
HOST-RESOURCES-MIB::hrStorageIndex.X <-- Index für LLD
HOST-RESOURCES-MIB::hrStorageType.X <-- Name, search for "hrStorageRam" here
HOST-RESOURCES-MIB::hrStorageSize.X <-- actual size of memory
HOST-RESOURCES-MIB::hrStorageUsed.X <-- used memory

in my case, X = 1. But that may differ. Better utilize LLD for that.

[SouperGrover]

Thanks, steveboyson. I was hoping to be able to add this to a template. But the index has a good possibility of being different on different devices right?

[steveboyson]

Not too sure about that. I would expect to have the RAM counters appearing at index 1 anytime - but on the other hand: why not be safe and check for "hrStorageRam"?

Your LLD rule OID would then:
HOST-RESOURCES-MIB::hrStorageType
and you would filter on {#SNMPVALUE} with a regexp that allows only "hrStorageRam".

The item prototypes will use {#SNMPINDEX}.

P.S. There are other OID in that region, better have your MIBs in place and do a

snmpwalk -v2c -c<SNMP_COMMUNITY> your-device .1.3.6.1.2.1.25.2.3.1

to be sure not to miss something.
Probably HOST-RESOURCES-MIB::hrStorageAllocationUnits is of interest.

[mgajjar]

I am new to Zabbix. I want to monitor my Linux Server's memory utilization via SNMP.

The default item in the item prototype calculates the free memory.

But I know that Linux defines free memory without including buffer/cache.

Is there a way that I can say that calculate memory that is free + buffer/cache?