Just installed nagios on a central machine and nrpe on 10 remote linux machines and just started monitoring them. It works great. I can get cpu load, current users, processes, mysql, etc. I can't find a way to monitor memory usage using the core plugins. What am I missing? Do I need an external plugin to do this?

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i suggest you rather monitor swap usage. check out check_swap plugin - it comes by default [at least in debian].

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This is exactly what I was looking for... thanks... – rmarimon Sep 30 '10 at 19:40
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