Nagios Support Forum

free -m
top|head -5

I would recommend allocating at least 8GB of ram to the machine, as 2GB isn't quite enough. This is why you saw the previous error.

Thanks that helped.
With 8GB assigned, it has stayed online for several days. Although it does seem to be using up most of the 8GB already.
May need more once I add more devices.

Can you post the output of free -m again? I'd like to see how much of it is cached. NLS will use your memory as a cache for logs.

Also - how much data do you have incoming per day?

Here is the output.
It's around 1GB on average.
The last 3 days were 1.3 GB, 1.3GB and 532MB.

NLS keeps all of those logs in memory, so the more logs you receive, the more RAM that it is going to eat up. Right now it seems that 8GB is pretty stable. If you run into more instability, I would recommend you look at backup and retention, and have it start closing some of the indices that are no longer needed.