├── Dockerfile
├── LICENSE
├── README.md
└── create-multiple-postgresql-databases.sh


/Dockerfile:
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1 | FROM library/postgres:9.6-alpine
2 | 
3 | COPY create-multiple-postgresql-databases.sh /docker-entrypoint-initdb.d/
4 | 
5 | RUN chmod +x /docker-entrypoint-initdb.d/create-multiple-postgresql-databases.sh
6 | 
7 | EXPOSE 5432
8 | 


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/LICENSE:
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 1 | MIT License
 2 | 
 3 | Copyright (c) 2017 Mart Sõmermaa
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


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/README.md:
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 1 | # Using multiple databases with the official PostgreSQL Docker image
 2 | 
 3 | The [official recommendation](https://hub.docker.com/_/postgres/) for creating
 4 | multiple databases is as follows:
 5 | 
 6 | *If you would like to do additional initialization in an image derived from
 7 | this one, add one or more `*.sql`, `*.sql.gz`, or `*.sh` scripts under
 8 | `/docker-entrypoint-initdb.d` (creating the directory if necessary). After the
 9 | entrypoint calls `initdb` to create the default `postgres` user and database,
10 | it will run any `*.sql` files and source any `*.sh` scripts found in that
11 | directory to do further initialization before starting the service.*
12 | 
13 | This directory contains a script to create multiple databases using that
14 | mechanism.
15 | 
16 | ## Usage
17 | 
18 | ### By mounting a volume
19 | 
20 | Clone the repository, mount its directory as a volume into
21 | `/docker-entrypoint-initdb.d` and declare database names separated by commas in
22 | `POSTGRES_MULTIPLE_DATABASES` environment variable as follows
23 | (`docker-compose` syntax):
24 | 
25 |     myapp-postgresql:
26 |         image: postgres:9.6.2
27 |         volumes:
28 |             - ../docker-postgresql-multiple-databases:/docker-entrypoint-initdb.d
29 |         environment:
30 |             - POSTGRES_MULTIPLE_DATABASES="DB1,ownerOfDB1: DB2,ownerOfDB2: ...DB(n), ownerOfDB(n)"
31 |             - POSTGRES_PASSWORD=
32 | 
33 | ### By building a custom image
34 | 
35 | Clone the repository, build and push the image to your Docker repository,
36 | for example for Google Private Repository do the following:
37 | 
38 |     docker build --tag=eu.gcr.io/your-project/postgres-multi-db .
39 |     gcloud docker -- push eu.gcr.io/your-project/postgres-multi-db
40 | 
41 | You still need to pass the `POSTGRES_MULTIPLE_DATABASES` environment variable
42 | to the container:
43 | 
44 |     myapp-postgresql:
45 |         image: eu.gcr.io/your-project/postgres-multi-db
46 |         environment:
47 |             - POSTGRES_MULTIPLE_DATABASES="DB1,ownerOfDB1: DB2,ownerOfDB2: ...DB(n), ownerOfDB(n)"
48 |             - POSTGRES_PASSWORD=
49 | 
50 | ### Non-standard database names
51 | 
52 | If you need to use non-standard database names (hyphens, uppercase letters etc), quote them in `POSTGRES_MULTIPLE_DATABASES`:
53 | 
54 |         environment:
55 |             - POSTGRES_MULTIPLE_DATABASES="DB1","ownerOfDB1": "DB2","ownerOfDB2": ..."DB(n)", "ownerOfDB(n)"
56 | 


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/create-multiple-postgresql-databases.sh:
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 1 | #!/bin/bash
 2 | 
 3 | set -e
 4 | set -u
 5 | 
 6 | function create_user_and_database() {
 7 | 	local database=$(echo $1 | tr ',' ' ' | awk  '{print $1}')
 8 | 	local owner=$(echo $1 | tr ',' ' ' | awk  '{print $2}')
 9 | 	echo "  Creating user and database '$database'"
10 | 	psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" <<-EOSQL
11 | 	    CREATE USER $owner IF NOT EXISTS;
12 | 	    CREATE DATABASE $database;
13 | 	    GRANT ALL PRIVILEGES ON DATABASE $database TO $owner;
14 | EOSQL
15 | }
16 | 
17 | if [ -n "$POSTGRES_MULTIPLE_DATABASES" ]; then
18 | 	echo "Multiple database creation requested: $POSTGRES_MULTIPLE_DATABASES"
19 | 	for db in $(echo $POSTGRES_MULTIPLE_DATABASES | tr ':' ' '); do
20 | 		create_user_and_database $db
21 | 	done
22 | 	echo "Multiple databases created"
23 | fi
24 | 


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