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Docker

Run from your command line:

docker version
Possible result Explanation
bash: docker: No such file or directory You need to install docker
Client: Version: < 1.0.0 You need a newer version of docker
Server: Version: < 1.0.0 You need a newer version of docker
Client: Version: > 1.0.0\nServer: Version: > 1.0.0 You are all good

If you need to install docker, start here:

https://docs.docker.com/engine/installation/

Run from your command line:

docker ps

If you see a (possibly empty) list of running containers, you are good.