How can i find what is causing my CPU/Disk Write usage to boost?

Hello i current have a LAMP Stack running on Ubuntu 14.04, and there is something wrong going one, for apparently no reason my CPU usage is being boosted to 100% which is causing all my websites to go down.

When this happen, i reboot my server and everything goes back to normal, my question is how can i find what is causing my CPU usage to go up so fast?

Thanks is advance for any help!

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You may install htop or such tools via your terminal log in then keep monitoring to check what is causing this,


I faced such once with my droplet and htop helped me locate a faulty plugin of my WordPress installation