Understanding the Docker Compose Example Configuration

The example file we will be referring to in this guide can be seen here. If you prefer Alpine-based containers, see the alternative compose file here.

This example is running three containers that we have mentioned at the beginning of this guide.

1. Broadcast Channel
2. OPAL Server
3. OPAL CLient

Here is an overview of the whole docker-compose.yml file, but don't worry, we will be referring to each section separately.

services:
  broadcast_channel:
    image: postgres:alpine
    environment:
      - POSTGRES_DB=postgres
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=postgres
  opal_server:
    image: permitio/opal-server:latest
    environment:
      - OPAL_BROADCAST_URI=postgres://postgres:postgres@broadcast_channel:5432/postgres
      - UVICORN_NUM_WORKERS=4
      - OPAL_POLICY_REPO_URL=https://github.com/permitio/opal-example-policy-repo
      - OPAL_POLICY_REPO_POLLING_INTERVAL=30
      - OPAL_DATA_CONFIG_SOURCES={"config":{"entries":[{"url":"http://opal_server:7002/policy-data","topics":["policy_data"],"dst_path":"/static"}]}}
      - OPAL_LOG_FORMAT_INCLUDE_PID=true
    ports:
      - "7002:7002"
    depends_on:
      - broadcast_channel
  opal_client:
    image: permitio/opal-client:latest
    environment:
      - OPAL_SERVER_URL=http://opal_server:7002
      - OPAL_LOG_FORMAT_INCLUDE_PID=true
      - OPAL_INLINE_OPA_LOG_FORMAT=http
    ports:
      - "7766:7000"
      - "8181:8181"
    depends_on:
      - opal_server
    command: sh -c "./wait-for.sh opal_server:7002 --timeout=20 -- ./start.sh"