DevOps-Microservices-Platform

test locally:

docker --version docker-compose --version node --version python3 --version

API service

cd services/api npm install

sudo docker run -d -p 27017:27017 --name mongo-local mongo:6

sudo docker run -d -p 6379:6379 --name redis-local redis:7-alpine

//if containers already created run

sudo docker start mongo-local sudo docker start redis-local

node server.js

curl http://localhost:3003/health

curl http://localhost:3003/api/products

curl -X POST http://localhost:3003/api/products
-H "Content-Type: application/json"
-d '{ "name": "Test Product", "description": "A test product", "price": 29.99, "category": "Electronics", "stock": 100 }'

curl http://localhost:3003/api/products

curl http://localhost:3003/metrics

sudo docker stop mongo-local redis-local sudo docker rm mongo-local redis-local

Recommendation sevice

cd services/recommendation

python3 -m venv venv source venv/bin/activate

pip install -r requirements.txt

sudo docker run --name redis-local -p 6379:6379 -d redis:7-alpine

python app.py

curl http://localhost:5000/health

curl http://localhost:5000/api/recommendations/user123

deactivate docker stop redis-local && docker rm redis-local

Full integration test with docker compose

cd /root folder

docker-compose build

docker-compose up || docker-compose up -d

docker-compose logs || docker-compose logs -f

docker-compose logs -f api docker-compose logs -f recommendation docker-compose logs -f frontend

//last 50 docker-compose logs --tail=50 api

docker-compose ps

Test API service health

curl http://localhost:3003/health

Test Recommendation service health

curl http://localhost:5000/health

Test Frontend (should return HTML)

curl http://localhost:80

Get recommendations for a user

curl http://localhost:5000/api/recommendations/user123

Test caching (second request should be faster)

time curl http://localhost:5000/api/recommendations/user123 time curl http://localhost:5000/api/recommendations/user123

API metrics

curl http://localhost:3000/metrics

Recommendation metrics

curl http://localhost:5000/metrics

Connect to MongoDB container

docker exec -it devops-microservices-platform-mongodb-1 mongosh

Inside MongoDB shell:

show dbs use products show collections db.products.find().pretty() exit

Or as one-liner:

docker exec -it devops-microservices-platform-mongodb-1 mongosh --eval "db.getSiblingDB('products').products.find().pretty()"

Connect to Redis container

docker exec -it devops-microservices-platform-redis-1 redis-cli

Inside Redis CLI:

KEYS * GET products:all GET recommendations:user123 exit

Or as one-liner:

docker exec -it devops-microservices-platform-redis-1 redis-cli KEYS "*"

Check container health status

docker ps --format "table {{.Names}}\t{{.Status}}"

Inspect specific container health

docker inspect devops-microservices-platform-api-1 | grep -A 10 Health

View health check logs

docker inspect devops-microservices-platform-api-1 --format='{{json .State.Health}}' | jq

Test Auto-scaling Behavior (Simulate Load)

Monitor resource usage

docker stats

In another terminal, generate load

while true; do curl -s http://localhost:3000/api/products > /dev/null; done

Test Service Recovery

Stop a service to test restart behavior

docker-compose stop api

Try to access API

curl http://localhost:3000/health

Expected: Connection refused

Restart service

docker-compose start api

Wait a few seconds and test again

sleep 5 curl http://localhost:3000/health

Expected: Service responds again

Clean Up

Stop all services (containers keep data)

docker-compose stop

Stop and remove containers (data persists in volumes)

docker-compose down

Stop and remove everything including volumes (fresh start)

docker-compose down -v

Remove images as well

docker-compose down -v --rmi all

List all containers

docker ps -a

Remove specific container

docker rm -f container_name_or_id

Troubleshooting

Error: "port is already allocated"

Find what's using the port

MacOS/Linux:

lsof -i :3000

Windows:

netstat -ano | findstr :3000

Kill the process or change port in docker-compose.yml

ports:

• "3001:3000" # Use different host port

Check Docker network

docker network ls docker network inspect devops-microservices-platform_app-network

Verify all services are on same network

docker-compose ps

Clear Docker build cache

docker builder prune

Rebuild without cache

docker-compose build --no-cache

Check Dockerfile for errors

docker-compose config

Check logs for error messages

docker-compose logs api

Run container interactively to debug

docker-compose run api sh

Wait for MongoDB to be ready

docker-compose logs mongodb

Verify MongoDB is accessible

docker exec -it devops-microservices-platform-mongodb-1 mongosh --eval "db.runCommand({ ping: 1 })"

Run test-local.sh

chmod +x test-local.sh ./test-local.sh