Why MySQL hogs all the memory for no reason in Ubuntu 18.04 LTS with 1GB system memory?

MySQL seem to be the culprit in our Ubuntu 18.04 LTS installation using the basic 1 CPU & 1 GB RAM configuration. We have a CMS installed with Docker and besides that there’s pretty much only apache and certbot. We keep having problems with memory as uploading videos usually fails due to a “internal server error”. We used htop command to find out the memory usage.

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Before going into the stack build, I’d like to introduce myself. I’m Dave Hilditch, founder of WP Intense. I’ve been developing WordPress plugins focused on improving WordPress performance for the past 4 years after leaving Skyscanner.

Minimum Hardware Requirements
This section describes the minimum hardware requirements for the Enterprise Service Monitor.

2 CPU Cores


Disk I/O subsystem applicable to a write-intensive database