Added day 33 tasks

Author: LondheShubham153

2026/day-33/README.md

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+# Day 33 – Docker Compose: Multi-Container Basics
+
+## Task
+Today's goal is to **run multi-container applications with a single command**.
+
+Yesterday you manually created networks and volumes and ran containers one by one. Docker Compose does all of that in one YAML file.
+
+---
+
+## Expected Output
+- A markdown file: `day-33-compose.md`
+- All `docker-compose.yml` files you create
+
+---
+
+## Challenge Tasks
+
+### Task 1: Install & Verify
+1. Check if Docker Compose is available on your machine
+2. Verify the version
+
+---
+
+### Task 2: Your First Compose File
+1. Create a folder `compose-basics`
+2. Write a `docker-compose.yml` that runs a single **Nginx** container with port mapping
+3. Start it with `docker compose up`
+4. Access it in your browser
+5. Stop it with `docker compose down`
+
+---
+
+### Task 3: Two-Container Setup
+Write a `docker-compose.yml` that runs:
+- A **WordPress** container
+- A **MySQL** container
+
+They should:
+- Be on the same network (Compose does this automatically)
+- MySQL should have a named volume for data persistence
+- WordPress should connect to MySQL using the service name
+
+Start it, access WordPress in your browser, and set it up.
+
+**Verify:** Stop and restart with `docker compose down` and `docker compose up` — is your WordPress data still there?
+
+---
+
+### Task 4: Compose Commands
+Practice and document these:
+1. Start services in **detached mode**
+2. View running services
+3. View **logs** of all services
+4. View logs of a **specific** service
+5. **Stop** services without removing
+6. **Remove** everything (containers, networks)
+7. **Rebuild** images if you make a change
+
+---
+
+### Task 5: Environment Variables
+1. Add environment variables directly in your `docker-compose.yml`
+2. Create a `.env` file and reference variables from it in your compose file
+3. Verify the variables are being picked up
+
+---
+
+## Hints
+- Start: `docker compose up -d`
+- Stop: `docker compose down`
+- Logs: `docker compose logs -f`
+- Compose creates a default network for all services automatically
+- Service names in compose are the DNS names containers use to talk to each other
+
+---
+
+## Submission
+1. Add your compose files and `day-33-compose.md` to `2026/day-33/`
+2. Commit and push to your fork
+
+---
+
+## Learn in Public
+Share your WordPress + MySQL running via Compose on LinkedIn.
+
+`#90DaysOfDevOps` `#DevOpsKaJosh` `#TrainWithShubham`
+
+Happy Learning!
+**TrainWithShubham**