How can I set persistent data in docker-compose.yml file

Question

New to Docker, and moving on to docker compose. In the past I would start up a container with: docker run -v /localFolder:/containerFolder containerName

I am trying to do the same in a docker-compose.yml, or even in Dockerfile.

Answer 1

Use volumes

volumes: 

# Just specify a path and let the Engine create a volume
 - /var/lib/mysql 

# Specify an absolute path mapping
 - /opt/data:/var/lib/mysql 

# Path on the host, relative to the Compose file
 - ./cache:/tmp/cache 

# User-relative path
 - ~/configs:/etc/configs/:ro 

# Named volume
 - datavolume:/var/lib/mysql

See also detailed post: Use volumes

Answer 2

This is the way to persist the data in volume to the instance

services:
  redis:
    volumes:
      - '_data:/var/lib/data'

volumes:
  _data:
    driver: local