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you have full root on the box, pick your flavour of linux to install. I also have ssh keys that it auto-installs for me.
You can have a reserved IP (extra cost), comes with 1 static for free, can do IPv6 (free, but if you don't do at start, you need to reboot).
They also have lots of different data centers around the world. I have a server in SFO (vpn) and NYC (www). Both run Ubuntu.
Tbh, I'm very happy with DO and will keep using them. Earlier in this thread you'll see a speedtest I did breaking 700Mbit/s which is fine for me. They also go all the way up to like 20 cpu boxes.
Do those boxes give you root / access to network confinguration