Using same postgres container for a spring project database and a keycloak database - spring

Question

I am trying to run three dockerized services:
Spring-boot app
Keycloak for authentication
Postgres as database
I would like to have both the Spring-boot app and the Keycloak app to use the same Postgres container as their database, but I couldn't find a way to make it work. My docker-compose.yml is as follows:
version: '3.7'
services:
db:
image: 'postgres:13.1-alpine'
container_name: db
ports:
- "5432:5432"
volumes:
- ./app_data:/var/lib/postgresql/data_app
- ./keycloak_data:/var/lib/postgresql/data_keycloak
- ../docker-postgresql-multiple-databases:/docker-entrypoint-initdb.d
environment:
POSTGRES_MULTIPLE_DATABASES: keycloak, app_user
POSTGRES_PASSWORD: password
healthcheck:
test: [ "CMD-SHELL", "pg_isready" ]
interval: 10s
timeout: 5s
retries: 5
keycloak:
image: jboss/keycloak:14.0.0
container_name: keycloak
environment:
- KEYCLOAK_USER=admin
- KEYCLOAK_PASSWORD=admin
- DB_VENDOR=postgres
- DB_ADDR=postgres
- DB_USER=keycloak
- DB_PASSWORD=password
- JDBC_PARAMS=useSSL=false
ports:
- "8080:8080"
depends_on:
- db
healthcheck:
test: "curl -f http://localhost:8080/auth || exit 1"
start_period: 20s
app:
image: 'app.postgre:latest'
build:
context: .
container_name: app
depends_on:
- db
- keycloak
environment:
- SPRING_DATASOURCE_URL=jdbc:postgresql://db:5432/app
- SPRING_DATASOURCE_USERNAME=app_user
- SPRING_DATASOURCE_PASSWORD=password
- SPRING_JPA_HIBERNATE_DDL_AUTO=update
volumes:
app_data:
postgres_data:
(Note: I tried using the following code: https://github.com/mrts/docker-postgresql-multiple-databases to set-up the needed databases by hand, but even so it still fails. I also tried doing without this script, but that also failed.)
I have tried them and managed to make a docker-compose file which runs the spring app and the database together, and another docker-compose file which runs the keycloak app and the database together, but when I try to bring all three together it fails.

Answer 1

I have a very similar setup with Postgres, Keycloak, pgAdmin and a Golang API service. The skeleton of my docker-compose.yml is like this, give it a try (I omitted some parts for simplicity), it is working for me. I think the important parts here are networks and links, and also setting up multiple databases (as you already do). I use db as the hostname of Postgres server, when I connect to it via pgAdmin for example.
services:
db:
build:
context: .
dockerfile: ./Dockerfile.db
volumes:
networks:
- mynetwork
restart: unless-stopped
ports:
- ${POSTGRES_PORT}:5432
environment:
- POSTGRES_MULTIPLE_DATABASES=${POSTGRES_MULTIPLE_DATABASES}
- POSTGRES_USER=${POSTGRES_USER}
- POSTGRES_PASSWORD=${POSTGRES_PASSWORD}
healthcheck:
pgadmin:
image: dpage/pgadmin4
restart: unless-stopped
environment:
volumes:
ports:
networks:
- mynetwork
restart: unless-stopped
depends_on:
- db
api:
build:
context: .
dockerfile: ./Dockerfile.api
ports:
environment:
- POSTGRES_HOST=${POSTGRES_HOST}
- POSTGRES_PORT=${POSTGRES_PORT}
volumes:
networks:
- mynetwork
depends_on:
- db
links:
- db
restart: unless-stopped
keycloak:
image: quay.io/keycloak/keycloak:latest
environment:
- DB_VENDOR=${KEYCLOAK_DB_VENDOR}
- DB_ADDR=${KEYCLOAK_DB_ADDR}
- DB_DATABASE=${KEYCLOAK_DB_DATABASE}
- DB_USER=${KEYCLOAK_DB_USER}
- DB_SCHEMA=${KEYCLOAK_DB_SCHEMA}
- DB_PASSWORD=${KEYCLOAK_DB_PASSWORD}
- KEYCLOAK_USER=${KEYCLOAK_USER}
- KEYCLOAK_PASSWORD=${KEYCLOAK_PASSWORD}
ports:
- ${KEYCLOAK_PORT}:8080
depends_on:
- db
networks:
- mynetwork
links:
- db
restart: unless-stopped
volumes:
volumes:
networks:
mynetwork:
And some important a values from my .env:
POSTGRES_MULTIPLE_DATABASES=mydb,keycloak
POSTGRES_USER=
POSTGRES_PASSWORD=
POSTGRES_HOST=db
POSTGRES_PORT=5432
KEYCLOAK_PORT=8084
KEYCLOAK_DB_VENDOR=POSTGRES
KEYCLOAK_DB_ADDR=db
KEYCLOAK_DB_DATABASE=keycloak
KEYCLOAK_DB_USER=
KEYCLOAK_DB_SCHEMA=public
KEYCLOAK_DB_PASSWORD=
KEYCLOAK_USER=
KEYCLOAK_PASSWORD=
My Dockerfile.db is like this, you don't need the localedef part (I need it for Hungarian localization):
FROM postgres:latest
RUN localedef -i hu_HU -c -f UTF-8 -A /usr/share/locale/locale.alias hu_HU.UTF-8
COPY docker-postgresql-multiple-databases.sh /docker-entrypoint-initdb.d/
And docker-postgresql-multiple-databases.sh contains:
#!/bin/bash
set -e
set -u
function create_user_and_database() {
local database=$1
echo " Creating user and database '$database'"
psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" <<-EOSQL
CREATE USER $database;
CREATE DATABASE $database;
GRANT ALL PRIVILEGES ON DATABASE $database TO $database;
EOSQL
}
if [ -n "$POSTGRES_MULTIPLE_DATABASES" ]; then
echo "Multiple database creation requested: $POSTGRES_MULTIPLE_DATABASES"
for db in $(echo $POSTGRES_MULTIPLE_DATABASES | tr ',' ' '); do
create_user_and_database $db
done
echo "Multiple databases created"
fi