docker-compose

docker compose is designed to simplify running multi-container applications using a single command.

version: '3.8'
 
services:
	<service-name>:
		image: <image-name>
		build: <location-of-dockerfile>
		container-name: <name>

to build all the containers, you can run docker compose build.

you can use the service name to run a container.

docker compose run <service-name>

bind mounts

you can specify volumes just like shown below. one thing to note, you can put relative urls here.

version: '3.8'
 
services:
	<service-name>:
		image: <image-name>
		build: <location-of-dockerfile>
		volumes:
			<host-path>:<container-path>

ports, environment variables

you can publish ports like this:

# map ports
services:
	<service-name>:
		ports:
			<host-port>:<container-port>

you can define environment variables like this:

services:
	<service-name>:
		environment:
			- VARIABLE=value
			- VARIABLE=value

[other ways to define env variables in docker] → https://docs.docker.com/compose/environment-variables/set-environment-variables/

related

contents

• basic docker commands
• running docker containers
• dockerfile
• bind mount, ports and expose
• docker volumes
• docker-compose
• docker networking

creating container from scratch → https://youtu.be/8fi7uSYlOdc namespaces, cgroups, union filesystems

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