59 lines
2.2 KiB
Markdown
59 lines
2.2 KiB
Markdown
# Using multiple databases with the official PostgreSQL Docker image
|
|
|
|
The [official recommendation](https://hub.docker.com/_/postgres/) 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.*
|
|
|
|
This directory contains a script to create multiple databases using that
|
|
mechanism.
|
|
|
|
## Usage
|
|
|
|
### By mounting a volume
|
|
|
|
Clone the repository, mount its directory as a volume into
|
|
`/docker-entrypoint-initdb.d` and declare database names separated by commas and each entry with database, user and password separated by double colon in `POSTGRES_MULTIPLE_DATABASES` environment variable as follows
|
|
(`docker-compose` syntax):
|
|
|
|
myapp-postgresql:
|
|
image: postgres:9.6.2
|
|
volumes:
|
|
- ../docker-postgresql-multiple-databases:/docker-entrypoint-initdb.d
|
|
environment:
|
|
- POSTGRES_MULTIPLE_DATABASES=db1:user:pwd,db2:user:pwd
|
|
- POSTGRES_USER=myapp
|
|
- POSTGRES_PASSWORD=
|
|
- POSTGRES_DB=db
|
|
|
|
### By building a custom image
|
|
|
|
Clone the repository, build and push the image to your Docker repository,
|
|
for example for Google Private Repository do the following:
|
|
|
|
docker build --tag=eu.gcr.io/your-project/postgres-multi-db .
|
|
gcloud docker -- push eu.gcr.io/your-project/postgres-multi-db
|
|
|
|
You still need to pass the `POSTGRES_MULTIPLE_DATABASES` environment variable
|
|
to the container:
|
|
|
|
myapp-postgresql:
|
|
image: eu.gcr.io/your-project/postgres-multi-db
|
|
environment:
|
|
- POSTGRES_MULTIPLE_DATABASES=db1,db2
|
|
- POSTGRES_USER=myapp
|
|
- POSTGRES_PASSWORD=
|
|
- POSTGRES_DB=db
|
|
|
|
### Non-standard database names
|
|
|
|
If you need to use non-standard database names (hyphens, uppercase letters etc), quote them in `POSTGRES_MULTIPLE_DATABASES`:
|
|
|
|
environment:
|
|
- POSTGRES_MULTIPLE_DATABASES="test-db-1:user:pwd","test-db-2:user:pwd"
|