Docker can be installed using information provided on https://www.docker.com/get-started.
Hyperledger Composer works with two versions of Docker:
- Docker Composer version 1.8 or higher
- Docker Engine version 17.03 or higher
If you already have Docker installed but you're not sure about the version, you can find out what the version is by using the following command in the terminal or command prompt:
docker –version
Be careful: many Linux-based operating systems, such as Ubuntu, come with the most recent version of Python (Python 3.5.1). In this case, it's important to get Python version 2.7. You can get it here: https://www.python.org/download/releases/2.7/.