A docker-compose file reference

A docker-compose file is used to define services, networks and volumes for containers in an environment. The extension for the compose file can be either .yml or .yaml. You can use any of your favorite text editors to author a compose file. By default, docker-compose tool looks for the compose file in the current directory. docker-compose file is versioned; the latest version at the time of writing is version 3. A docker-compose file consists of key:option:value pairs, the version:3.0 key:value pair in the preceding example of the compose file tells the tool which version to use while validating the contents of the file. Following the indentation rules for a compose file is very important, if you consider the docker-compose file as a table of characters with rows and columns, every new key:value pair starts at column 0 in a compose file. The options for a key, like web in the preceding example starts at column 1 or say after leaving a space. Similarly, the...