commands.sh

# --- Install Required Tools ---
sudo apt update
sudo apt install -y curl ca-certificates
curl -fsSL https://get.docker.com -o get-docker.sh
ls -lh get-docker.sh
sudo sh get-docker.sh

# --- Executing docker install script, commit: 7d96bd3c5235ab2121bcb855dd7b3f3f37128ed4 ---
sudo usermod -aG docker $USER
newgrp docker
groups
docker --version

# --- Step 1: Set Up Project Structure ---
mkdir -p ~/containerize-lab
cd ~/containerize-lab
pwd
mkdir -p api worker shared
find . -maxdepth 1 -type d | sort

# --- Step 2: Create Shared Configuration ---
nano shared/config.py
cat shared/config.py

# --- Step 3: Create API Service ---
nano api/app.py
nano api/requirements.txt
cat api/requirements.txt

# --- Step 4: Create Worker Service ---
nano worker/worker.py
nano worker/requirements.txt
cat worker/requirements.txt

# --- Step 1: Create API Dockerfile ---
nano api/Dockerfile
cat api/Dockerfile

# --- Step 2: Create Worker Dockerfile ---
nano worker/Dockerfile
cat worker/Dockerfile

# --- Step 3: Create Docker Compose File (Optional Reference) ---
nano docker-compose.yml
ls -R

# --- Step 1: Build Docker Images ---
cd ~/containerize-lab
docker build -t task-api:v1 -f api/Dockerfile .
docker build -t task-worker:v1 -f worker/Dockerfile .
docker images | grep task

# --- Step 2: Create Docker Network ---
docker network create app-network
docker network ls

# --- Step 3: Run Redis Container ---
docker run -d --name redis --network app-network -p 6379:6379 redis:7-alpine
docker ps | grep redis

# --- Step 4: Run API Container ---
docker run -d \
--name api \
--network app-network \
-p 5000:5000 \
-e REDIS_HOST=redis \
-e REDIS_PORT=6379 \
task-api:v1
docker logs api

# --- Step 5: Run Worker Container ---
docker run -d \
--name worker \
--network app-network \
-e REDIS_HOST=redis \
-e REDIS_PORT=6379 \
task-worker:v1
docker logs worker

# --- Step 1: Verify All Containers Running ---
docker ps

# --- Step 2: Test API Health Endpoint ---
curl http://localhost:5000/health

# --- Step 3: Test Task Submission and Processing ---
curl -X POST http://localhost:5000/task \
-H "Content-Type: application/json" \
-d '{"task_type": "process", "data": {"value": 42}}'
sleep 4
curl http://localhost:5000/result/8c0be32f-bd29-4da4-a7d7-a5d102f6b4e2
curl http://localhost:5000/result/12345678-1234-1234-1234-123456789abc

# --- Step 4: Inspect Container Networking ---
docker network inspect app-network

# --- Step 5: Check Container Logs ---
docker logs api --tail 20
docker logs worker --tail 20

# --- Container won't start ---
docker logs api

# --- Cannot connect to Redis ---
docker ps
docker network inspect app-network | grep -E '"Name":|"IPv4Address"'

# --- Port already in use ---
sudo lsof -i :5000
docker stop api
docker run -d \
--name api \
--network app-network \
-p 5001:5000 \
-e REDIS_HOST=redis \
-e REDIS_PORT=6379 \
task-api:v1
docker stop api
docker rm api
docker run -d \
--name api \
--network app-network \
-p 5000:5000 \
-e REDIS_HOST=redis \
-e REDIS_PORT=6379 \
task-api:v1

# --- Image build fails ---
find . -maxdepth 2 -type f | sort

# --- Worker not processing tasks ---
docker logs worker --tail 50
docker exec -it redis redis-cli

# --- Cleanup ---
docker stop api worker redis
docker rm api worker redis
docker network rm app-network
docker rmi task-api:v1 task-worker:v1
docker ps -a