Johan Louwers wrote:Actually, you can now use the base monitoring capabilities of Enterprise Manager 12c Cloud Control to monitor your Linux boxes for free. You don't need to pay for support or option packs or anything.
Putting in the free part is making this question a bit more dificult. You can have a look at Cacti and Nagios which are quite ok. However, depending on your OS and/or hardware you might find that you already have paid the license fee to be able to use sone of the Oracle Enterprise Manager hardware and OS plugins.