├── docker-compose.yml
├── init
    └── create-multiple-postgresql-databases.sh
└── README.md


/docker-compose.yml:
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 1 | version: '3.8'
 2 | networks:
 3 |   oprativ-network:
 4 |     driver: bridge
 5 | services:
 6 |   {{ SERVICE_NAME }}-db:
 7 |     image: postgres:latest
 8 |     container_name: {{ CONTAINER_NAME }}
 9 |     ports:
10 |         - 5432:5432
11 |     volumes:
12 |         - {{ VOLUME_NAME }}-data:/var/lib/postgresql/data
13 |         - ./init/create-multiple-postgresql-databases.sh:/docker-entrypoint-initdb.d/create-multiple-postgresql-databases.sh
14 |     environment:
15 |         POSTGRES_MULTIPLE_DATABASES: "{{ DATABASE_1 }}, {{ DATABASE_2 }}, {{ DATABASE_3 }}"
16 |         POSTGRES_PASSWORD: {{ PASSWORD }}
17 |         POSTGRES_USER: "{{ DB_USER }}"
18 |     networks:
19 |       - {{ NETWORK_NAME }}
20 | volumes:
21 |  {{ VOLUME_NAME }}-data:
22 | 
23 | 


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/init/create-multiple-postgresql-databases.sh:
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 1 | #!/bin/bash
 2 | 
 3 | set -e
 4 | set -u
 5 | 
 6 | function create_database_grant_privilege() {
 7 |         local database=$1
 8 |         echo "  Creating database '$database' and granting privileges to '$POSTGRES_USER'"
 9 |         psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" <<-EOSQL
10 |             CREATE DATABASE $database;
11 |             GRANT ALL PRIVILEGES ON DATABASE $database TO $POSTGRES_USER;
12 | EOSQL
13 | }
14 | 
15 | if [ -n "$POSTGRES_MULTIPLE_DATABASES" ]; then
16 |         echo "Multiple database creation requested: $POSTGRES_MULTIPLE_DATABASES"
17 |         for db in $(echo $POSTGRES_MULTIPLE_DATABASES | tr ',' ' '); do
18 |                 create_database_grant_privilege $db
19 |         done
20 |         echo "Multiple databases created"
21 | fi
22 | 
23 | 


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/README.md:
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 1 | # Using multiple databases with the official PostgreSQL Docker image
 2 | 
 3 | This is the implementation of the [official recommendation](https://hub.docker.com/_/postgres/) for creating multiple databases.
 4 | 
 5 | This repository contains a docker compose file with placeholders in mustache implementation with bash script to create multiple databases with minor improvement for granting privileges to related database user using that mechanism.
 6 | 
 7 | ## Usage
 8 | 
 9 | ### By mounting a volume
10 | 
11 | Clone the repository, replace the placeholder values in the `docker-compose.yml` file.
12 | 
13 | ### By building a custom image
14 | 
15 | Clone the repository, replace the placeholder values with current, build and push the image to your Docker repository,
16 | for example for Google Private Repository do the following:
17 | 
18 |     docker build --tag=eu.gcr.io/<project_name>/<image_name> .
19 |     gcloud docker -- push eu.gcr.io/<project_name>/<image_name>
20 | 
21 | ### Non-standard database names
22 | 
23 | If you need to use non-standard database names (hyphens, uppercase letters etc), quote them on this way in docker compose file:
24 | `- POSTGRES_MULTIPLE_DATABASES: "non-standard-db-name-1","non-standard-db-name-2"`
25 | 


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