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Im preparing a web-server and have already installed Wordpress on it. Everything worked fine. But instantly, the memory usage went up. Now I only have 300MB of memory free. To check the problem, I disabled some services like php, nginx, fail2ban, psad and mysql. It reduced the memory usage by a small amount but still its too high.

Then I restarted the machine and started working again. Again after some time, the memory usage shot up! How can I locate the exact problem? What might be causing this issue?

PS : Its an Ubuntu

PS : It looks like the swap is not yet used. Swap usage : 0 (The server is a virtual machine (KVM))

The output of free -m

             total       used       free     shared    buffers     cached
Mem:          2003       1764        238          0         43       1350
-/+ buffers/cache:        370       1633
Swap:         2043          0       2043
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If you want memory to stay free, don't assign it to a virtual machine! – David Schwartz Aug 27 '12 at 7:39
up vote 9 down vote accepted

Your memory usage is fine. You have 1633 MB useable of 2003 MB (the free section in the second line, where buffers are considered), 1350 MB is used up by buffers. Please read this site for an explanation.

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Thanks a lot for the explanation :) – THpubs Aug 26 '12 at 13:27

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