How to customize the configuration file of the official PostgreSQL Docker image?

Question

I\'m using the official Postgres Docker image trying to customize its configuration. For this purpose, I use the command sed to change max_connections

Answer 1

Using docker compose you can mount a volume with postgresql.auto.conf. Example:

version: '2'

services:
  db:
    image: postgres:10.9-alpine
    volumes:
      - postgres:/var/lib/postgresql/data:z
      - ./docker/postgres/postgresql.auto.conf:/var/lib/postgresql/data/postgresql.auto.conf
    ports:
      - 5432:5432