I feel like getting to the point that my container restarts when it dies is hard from just userdata loaded in when the instance is created. Everyone will let me

I feel like getting to the point that my container restarts when it dies is hard from just userdata loaded in when the instance is created. Everyone will let me spawn a base image with docker installed and shove in a userdata script but I want to say "please run these 3 docker images and if any of them die restart it" Additionally in k8s I can say "oh and update my dns provider to point to this pod and by the way stick TLS in front of it". I like those last bits a lot too.