It is popular because of the developer experience. You can get a Postgres database running with one command, and then throw it away (and no this is not equivale

It is popular because of the developer experience. You can get a Postgres database running with one command, and then throw it away (and no this is not equivalent to apt install postgres). Many other things are pretty polished as well, definitely more polished than LXC. Kubernetes and similar software "solve" some problems and create a bunch of new ones. I don't think the actual tech is that good (or new for that matter, Solaris had zones in ~2005); for example getting a core dump from a container without going into the host machine is an unsolved problem.