LXCs are still useful to use in a world with Docker. For example, if you're testing your infrastructure configuration code, you need some type of server to run

LXCs are still useful to use in a world with Docker. For example, if you're testing your infrastructure configuration code, you need some type of server to run it against. Using a base Ubuntu 18.04 Docker image might work, but there's a lot of things that Docker is incapable of allowing you to configure, where as with an LXC, you can. In other words, using Docker as an infrastructure target gives me about 80% confidence that things will work on a real host, but with LXCs that confidence level goes up to 99%. So it's common to have a snapshotted LXC image that you can use as a target system, so you can spin up a new fresh LXC based Linux distro in a few seconds. It's a lot faster than using something like Vagrant and fills a much needed gap for testing how you provision servers.