Anyway your system is under both global and local memory pressure. You
didn't see apache going down previously because it was probably the one
which was stuck and could be killed.
Anyway you need to setup your system more carefully.

There is, also, an evidence that system has enough of memory! :) Just take column 'rss' from process list in OOM message and sum it - you will get 2489911. It's probably in KB so it's about 2.4 GB. System has 14 GB of RAM so this also match data on my graph - 2.4 is about 17% of 14.

azur

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