links: Docker MOC

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Docker Volumes

In docker-compose.yml, you can create volumes for persistent data. These volumes are stored under docker app and can be used by containers

Example

volumes:
	node_modules:
	build:
	postgres-db:

In this example when you run docker-compose up it creates 3 volumes node_modules, build, postgres-db

Now In order to map these volumes to container, you add volumes to the container, for example. If you want to use postgres-db everytime for your postgres container, you can do something like this

services:
	db:
		image: postgres:alpine
	volumes:
		- "postgres-db:/var/lib/postgresql/data"

Now every time, the postgres container mounts postgres-db, so the data will be persistent

The reason is we are mapping source postgres-db to the postgres container destination where it is looking for data /var/lib/postgresql/data

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tags: docker