Recommendation :) Docker-compose built on top of the Docker container engine. To know more about Docker please follow this article which will give you a good sense to read this article.
What we will do in this article
- What is docker-compose? Why and when should we use it?
- Installation of docker-compose.
- Let's understand our services.
- Understand Docker-compose file.
- Run these services and access them through localhost.
Step 1: What is docker-compose? Why and when should we use it?
- Docker compose is built on top of docker.
- Docker compose solves the repeated work. Like build, deploy the docker files. Like in our above diagram we have three docker containers. So each container will have a build and run process.
- It helps to reduce human effort. So, fewer errors occur while building and deploying the docker files
Step 2: Installation of docker-compose.
- If you are using docker desktop to run your docker container then we do not require any extra installation steps.
- If docker is used from docker CLI then need to follow the following steps.
Step 3: Let’s understand our services.
- Clone this github repo.
- Next shift to branch basic-docker-compose
- We are having three service
1. Mongodb Service
2. User Service. => Depends on Mongodb service
3. Gateway Service => Depends on User service - To learn more about repo read this article.
Step 4. Understand Docker-compose file.
- In this file, we are having docker-compose manifest file.
- This file just instructs the docker file on where to build and how to run.
version: "3.9"
# From here service and docker commands starts
services:
# Mongodb Container Info and commnads
mongodb: # name of service. This will be used by docker compose only
image: mongo # name of image. This will directly pull from container registry
ports:
- "27017:27017" # which port need to expose and connect
container_name: mongodb # name of container
# User Container Info and commnads
user: # User service. This will be used by docker compose only
build: # Build file path info
context: user # context to specify folder name where docker file is resides
dockerfile: ./Dockerfile # name of docker file
ports: # which port need to expose and connect
- "8080:8000"
container_name: user # name of container
environment: # pass environment variable to user service
- MONGODB_HOST=host.docker.internal:27017
depends_on: # dependency for user service. Specify service will start first.
- mongodb
# Gateway Container Info and commnads
gateway: # User service. This will be used by docker compose only
build: # Build file path info
context: gateway # context to specify folder name where docker file is resides
dockerfile: ./Dockerfile # name of docker file
environment: # pass environment variable to user service
- USER_HOST=host.docker.internal:8080
ports: # which port need to expose and connect
- "3000:3000"
container_name: gateway # name of container
depends_on: # dependenies for gateway service. Specify service will start first.
- mongodb
- user
Step 5: Run these services and access them through localhost.
- Run this following command to build and run docker files
docker compose up -d
- Next access our application from localhost:3000
Feedback: Thank you for reading this article. I hope you understood the basics of deploying your application from scratch with docker compose. Please feel free to ask questions or give suggestions to improve the content quality. Visit this for all articles.
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