compose.yml

# This sample docker compose file starts a Cloud Pub/Sub emulator and automatically creates a topic and subscription of desired names upon startup.
services:
  pubsub:
    image: google/cloud-sdk:emulators
    command:
      - /bin/bash
      - -ceu
      - |
        set -m
        gcloud beta emulators pubsub start --project=$$CLOUDSDK_CORE_PROJECT --host-port=0.0.0.0:$$PUBSUB_EMULATOR_HOST_PORT --quiet &
        while ! echo > /dev/tcp/localhost/$$PUBSUB_EMULATOR_HOST_PORT; do sleep 1; done
        gcloud pubsub topics create $$TOPIC
        gcloud pubsub subscriptions create $$SUBSCRIPTION --topic=$$TOPIC
        fg %1
    ports:
        # Point your Cloud Pub/Sub SDK client to this port by exporting the environment variable
        # `export PUBSUB_EMULATOR_HOST=localhost:8085` outside of the docker compose environment
        # or by setting the `PUBSUB_EMULATOR_HOST=pubsub:8085` environment variable in the service
        # that uses the Cloud Pub/Sub SDK client in this docker compose environment.
      - 8085:8085
    environment:
      # Equivalent to `gcloud config configurations activate default`
      CLOUDSDK_ACTIVE_CONFIG_NAME: default
      # Equivalent to `gcloud config set auth/disable_credentials true`
      CLOUDSDK_AUTH_DISABLE_CREDENTIALS: true
      # Equivalent to `gcloud config set account emulator@example.com`
      CLOUDSDK_CORE_ACCOUNT: emulator@example.com
      # Equivalent to `gcloud config set project test`
      CLOUDSDK_CORE_PROJECT: test
      # Equivalent to `gcloud config set api_endpoint_overrides/pubsub http://localhost:8085/`
      # Must be an absolute URI that begins with https:// and ends with a trailing /.
      CLOUDSDK_API_ENDPOINT_OVERRIDES_PUBSUB: http://localhost:8085/
      PUBSUB_EMULATOR_HOST_PORT: "8085"
      PUBSUB_EMULATOR_HOST: localhost:8085
      # Change these values `TOPIC` and `SUBSCRIPTION` to match your desired topic and subscription names
      TOPIC: test
      SUBSCRIPTION: test