Docker Compose Example / Database + App

docker-compose.local.yaml

version: "3.9"
# Definitions of the Services related to the Compose File.
# Each service is it's own container, Docker Compose handles 
# starting the services
services:
  # Database (MongoDB)
  database:
    # Image is related to a image locally or on a remote Docker Registry
    image: mongo
    container_name: mongodb
    # Environment allows you to set environment variables within the container
    environment:
      - PUID=1000
      - PGID=1000
    # Volumes sets up a local to remote mapping. Allowing you to persist data between restarts
    volumes:
      - ./database:/data/db
    # Ports defines which ports your container should expose. 
    # In this case, we expose 27017 and map it to port 27017 inside the container
    ports:
      - 27017:27017
    restart: unless-stopped
  # User Service
  shield:
    # Build tells docker that we are using a local Dockerfile instead of pulling a remote image.
    build:
      # The name of our local Dockerfile
      dockerfile: Dockerfile
      # The name of the Image once built See Dockerfile for why it is important
      target: dev
      # Where the docker file resides.
      context: .
    container_name: shield
    # Depends On tells docker to start the database before running this service
    depends_on:
      - "database"
    environment:
      - PUID=1000
      - PGID=1000
      - FURIOUS_CONFIG=config/staging.yaml
      - FURIOUS_MONGO_DB=A80FD952-B226-4FFA-B57F-0FD8F53FF9EF
    volumes:
      - ./database:/data/db
    ports:
      - 6710:6710
    restart: unless-stopped
    
   

Dockerfile

# Dockerfile References: https://docs.docker.com/engine/reference/builder/

# Start from golang:1.17-alpine base image and name the image `dev`
FROM golang:1.17-alpine as dev

# Add a work directory within the Container (not locally)
WORKDIR /app

# Copy local files from the current working directory into ./ in the container
COPY go.mod go.sum ./

# This Command is RUN inside of the Container.
RUN go mod download


# Copy app files
# This is copying local files in the CWD into the CWD of the Container
COPY . .

# Install Reflex for development
# Another command run inside of the container
RUN go install github.com/cespare/reflex@latest
# Expose port
# Exposes the following port from the container to the local environment
EXPOSE 6710
# Start app
# CMD is the entry point. The final command which should be long running.
CMD go run main.go serve