What is the keycloak docker compose Yaml file format for external postgres db connection URL - postgresql

Question

I need to setup the Keycloak docker server with the External postgres Database connection URL.
Here's my current yaml file content which is working with POstgres docker container image as mentioned
version: '3'
volumes:
postgres_data:
driver: local
services:
postgres:
image: postgres:11
volumes:
- postgres_data:/var/lib/postgresql/data
environment:
POSTGRES_DB: keycloak
POSTGRES_USER: keycloak
POSTGRES_PASSWORD: password
ports:
- 5433:5432
keycloak:
image:jboss/keycloak:latest
environment:
DB_VENDOR: POSTGRES
DB_ADDR: postgres
DB_DATABASE: keycloak
DB_USER: keycloak
DB_SCHEMA: public
DB_PASSWORD: password
KEYCLOAK_USER: admin
KEYCLOAK_PASSWORD: password
KEYCLOAK_LOGLEVEL: DEBUG
ROOT_LOGLEVEL: DEBUG
ports:
- 8080:8080
- 8443:8443
depends_on:
- postgres
I checked the official documentation for passing external DB connection URL.
But exactly didn't get what changes will be needed in YAML file
ref: https://hub.docker.com/r/jboss/keycloak/
I tried removing the Postgres and depends_on section from services and passed the Database connection details in Kecyloak environment section in yaml but it did not worked for me
Can anyone suggest the correct YAML file changes to use PostgresDB connection URL
Thank You.

Answer 1

Docker containers can see each other by their service name, so here service name postgres is actually the connection url for keycloak container.
version: '3'
volumes:
postgres_data:
driver: local
services:
postgres: # Service name
image: postgres:11
volumes:
- postgres_data:/var/lib/postgresql/data
environment:
POSTGRES_DB: keycloak
POSTGRES_USER: keycloak
POSTGRES_PASSWORD: password
ports:
- 5433:5432
keycloak:
image: jboss/keycloak:latest
environment:
DB_VENDOR: POSTGRES
DB_ADDR: postgres # <<< This is the address, change it to your external db ip/domain
DB_DATABASE: keycloak
DB_USER: keycloak
DB_SCHEMA: public
DB_PASSWORD: password
KEYCLOAK_USER: admin
KEYCLOAK_PASSWORD: password
KEYCLOAK_LOGLEVEL: DEBUG
ROOT_LOGLEVEL: DEBUG
ports:
- 8080:8080
- 8443:8443
depends_on:
- postgres