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YAML /'jæm.ḷ/ is a human-readable data serialization language. It is commonly used for configuration files, but could be used in many applications where data is being stored (e.g. debugging output) or transmitted (e.g. document headers). YAML targets many of the same communications applications as XML but has a minimal syntax which intentionally breaks compatibility with SGML [1]. It uses both Python-style indentation to indicate nesting, and a more compact format that uses [] for lists and {} for maps making YAML 1.2 a superset of JSON.
Custom data types are allowed, but YAML natively encodes scalars (such as strings, integers, and floats), lists, and associative arrays (also known as hashes, maps, or dictionaries).
==Docker compose vs docker stack==
In recent releases, a few things have happened in the Docker world. Swarm mode got integrated into the Docker Engine in 1.12, and has brought with it several new tools. Among others, it’s possible to make use of docker-compose.yml files to bring up stacks of Docker containers, without having to install Docker Compose.
The command is called docker stack, and it looks exactly the same to docker-compose.
Both docker-compose and the new docker stack commands can be used with docker-compose.yml files which are written according to the specification of version 3. For your version 2 reliant projects, you’ll have to continue using docker-compose. If you want to upgrade, it’s not a lot of work though.
As docker stack does everything docker compose does, it’s a safe bet that docker stack will prevail. This means that docker-compose will probably be deprecated and won’t be supported eventually.
However, switching your workflows to using docker stack is neither hard nor much overhead for most users. You can do it while upgrading your docker compose files from version 2 to 3 with comparably low effort.
If you’re new to the Docker world, or are choosing the technology to use for a new project - by all means, stick to using docker stack deploy.
Source: https://vsupalov.com/difference-docker-compose-and-docker-stack/
=SWARM=
