How to persist data in a dockerized postgres database using volumes

Question

My docker compose file has three containers, web, nginx, and postgres. Postgres looks like this:

postgres:
  container_name: postgres
  restart: always
  ima         


        

Answer 1

Strangely enough, the solution ended up being to change

volumes:
  - ./postgres-data:/var/lib/postgresql

to

volumes:
  - ./postgres-data:/var/lib/postgresql/data