I need to host several WP sites and I wonder if I can use one droplet for all of them. My sites are optimized and cached, so I do not foresee issues with memory/cpu
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×Yes you can!
However, what you may want to look out for is:
In addition to the above answers, you could also use the free Cloudflare service and nginx’s fastcgi cache. The combined power of those two things will mean that 99% of requests won’t even touch the backend or database etc. I followed this guide https://rtcamp.com/wordpress-nginx/tutorials/single-site/fastcgi-cache-with-purging/ but I see there’s also a tutorial here now: https://www.digitalocean.com/community/tutorials/how-to-setup-fastcgi-caching-with-nginx-on-your-vps
I managed to hammer the hell out of a small droplet and serve several thousand requests per minute without the load monitor even batting an eyelid, because, as I said, Cloudflare served most of the requests before they even hit the server, and the fastcgi cache served 99% of the rest.
As an added bonus over something like W3TC kind of plugins, with the fastcgi_cache methods, your site will stay up even if your back end/php/mysql goes down! Neat, huh?
(Obviously only for static content, not posting comments etc!)
Thank you very much for your hints! They are very helpful indeed. I have been using shared hosting for a few years but recently my sites started to experience lots of downtime. I think it is time to move to a server like digitalocean. I am only concerned that I know very little about Linux or nginx commands. I am used to use cPanel.