rock-containers

Repo to store container sources

Structure

This repo contains a structure allowing for tailoring applications agnostic to the container management backend. The idea is that we can create a new subdirectory to support a different orchestration provider.

example/
  docker/
    Dockerfile
    other-files
    foo.txt
  kubernetes/
    pod1.json
    pod2.json
    whatever-goes-here.json

This sort of mirrors the structure used by Project Atomic's nulecule library.

Containers

All the containers should be built upon rocknsm/base, which can be found on Docker Hub and in the base directory. base is built upon the centos/systemd container. We run our containers using systemd (See this blog post for discussion on the rationale. TLDR; you get lots of monitoring and resource abilities and a familiar init structure.

Requirements. The one thing you have to ensure you do for this to work is run the following on the host. After that, it just works ™️

sudo setsebool container_manage_cgroup 1

Currently these containers are development. They add two things to the base systemd container: RockNSM Devel Repo and confd. The first let's us easily build and deploy RPMs and the second lets us template configuration files and configure them using environment variables.

TODO

We have several containers to build to make them 12 Factor compliant. Check out the example and zookeeper builds to see examples how to do it.

Lastly, I don't claim to be the end-all-be-all expert on these things. I accept (and enjoy) a good argument. I have strong opinions, but happy to listen.

Thanks!