VPS on Linux ubuntu - elementary optimization and security settings?

Question

ubuntu

Now VPS are slowly but surely going to the masses.
Services such as https://www.digitalocean.com/ https://www.vultr.com/ https://www.linode.com/ and others offer ready-to-deploy images for popular Linux distributions. There are even immediately customized images with LAMP and popular CMS.
In fact, you don’t need brains at all, launched your “droplet” with WordPress, went to the wp-admin admin panel and here is the site for you. Now this is exactly how VPSs are starting to position themselves - as an easy and simple replacement for shared hosting. And this is all good, of course, but unlike shared hosting, with VPS, the newly minted "admin" remains 1on1. And everything is fine if everything works, but if suddenly what?
How are things going with optimization, security for such ready-made assemblies?
And generally speaking,what elementary actions should be done to be calm for your virtual machine on (ubuntu) for example?

Answer 1

Protect SSH, FTP so that access is only from the right IPs, complex passwords, set up blocking from ddosers (fail2ban).
With security, as with all nixes, it’s normal, but there are always holes.
But VPS most often break through errors in the sites themselves, cms and engines. They downloaded some plugin for the site, and a hole in it can infect you.
It is often worth going through sites with an aibolit or a shelffinder

Answer 2

> How are things going with optimization, security for such ready-made assemblies?
It sucks, in short, almost always. More details - you need to look at a specific assembly.
> what elementary actions should be done to be calm for your virtual machine on (ubuntu) for example?
VPS. What are the features of the work? see here my answer under the checkbox and comments to it.

Answer 3

Buy paid VPS service from a hosting provider.