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Understanding the Docker Compose Example Configuration

The example file we will be referring to in this guide can be seen 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"