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Using multiple databases with the official PostgreSQL Docker image

The official recommendation for creating multiple databases is as follows:

If you would like to do additional initialization in an image derived from this one, add one or more *.sql, *.sql.gz, or *.sh scripts under /docker-entrypoint-initdb.d (creating the directory if necessary). After the entrypoint calls initdb to create the default postgres user and database, it will run any *.sql files and source any *.sh scripts found in that directory to do further initialization before starting the service.

Usage (docker-compose)

myapp-postgresql:
    image: ghcr.io/captmicr0/docker-postgresql-multiple-databases:latest
    volumes:
        - ../docker-postgresql-multiple-databases:/docker-entrypoint-initdb.d
    environment:
        - POSTGRES_MULTIPLE_DATABASES=db1,db2
        - POSTGRES_USER=myapp
        - POSTGRES_PASSWORD=mypassword

Non-standard database names

If you need to use non-standard database names (hyphens, uppercase letters etc), no quotes are needed with this fork:

    environment:
        - POSTGRES_MULTIPLE_DATABASES=radarr-main,radarr-log,sonarr-main,sonarr-log,bazarr,readarr-audiobook-main,readarr-audiobook-log,readarr-audiobook-cache,readarr-ebook-main,readarr-ebook-log,readarr-ebook-cache,prowlarr-main,prowlarr-log,jellyseerr