created docker application

README.md

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+# Docker Web Application Deployment
+
+The application consists of two services:
+
+1. **Web Service (Nginx):**
+   - Uses the official Nginx image.
+   - Listens on port 80 inside the container and is mapped to host port 8080.
+2. **Database Service (MySQL 5.7):**
+   - Uses the official MySQL 5.7 image.
+   - Configured with a root password and a default database.
+   - Persists its data using the named volume `mysql-data`.
+
+## Files Overview
+
+- **prepare-app.sh:** 
+  - Creates the required Docker network (`myapp-net`) and persistent volume (`mysql-data`).
+- **docker-compose.yaml:**
+  - Defines the two services along with their ports, environment variables, volumes, and restart policies.
+- **start-app.sh:**
+  - Starts the services using Docker Compose in detached mode.
+  - Displays the URL to access the web service.
+- **stop-app.sh:**
+  - Stops the running containers without deleting the persistent volume.
+- **remove-app.sh:**
+  - Removes all the created resources (containers, network, and volume) from the deployment.
+
+## Deployment Instructions
+
+1. **Preparation:**
+   - Ensure Docker and Docker Compose are installed.
+   - Make the scripts executable:
+     ```bash
+     chmod +x prepare-app.sh start-app.sh stop-app.sh remove-app.sh
+     ```
+   - Run the preparation script:
+     ```bash
+     ./prepare-app.sh
+     ```
+
+2. **Starting the Application:**
+   - Launch the services by running:
+     ```bash
+     ./start-app.sh
+     ```
+   - Open your web browser and navigate to [http://localhost:8080](http://localhost:8080) to see the Nginx welcome page.
+
+3. **Stopping the Application:**
+   - Stop the services without losing data:
+     ```bash
+     ./stop-app.sh
+     ```
+
+4. **Removing the Application:**
+   - To completely remove all deployed resources, run:
+     ```bash
+     ./remove-app.sh
+     ```
+
+## Notes
+
+- The application uses an external network (`myapp-net`) and a persistent volume (`mysql-data`) that are created in `prepare-app.sh`.
+- The Nginx container depends on the MySQL container to demonstrate inter-service communication within the `myapp-net` network.
+- Containers are configured to restart on failure.
+

docker-compose.yaml

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+version: '3.8'
+
+services:
+  web:
+    image: nginx:latest
+    ports:
+      - "8080:80"          
+    networks:
+      - myapp-net
+    restart: on-failure
+    depends_on:
+      - db
+
+  db:
+    image: mysql:5.7
+    environment:
+      MYSQL_ROOT_PASSWORD: example
+      MYSQL_DATABASE: appdb
+    volumes:
+      - mysql-data:/var/lib/mysql
+    networks:
+      - myapp-net
+    restart: on-failure
+
+networks:
+  myapp-net:
+    external: true
+
+volumes:
+  mysql-data:
+    external: true
+

prepare-app.sh

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+#!/bin/bash
+# prepare-app.sh
+
+if ! docker network ls | grep -w myapp-net >/dev/null; then
+  docker network create myapp-net
+  echo "Created Docker network: myapp-net"
+else
+  echo "Docker network myapp-net already exists."
+fi
+
+
+if ! docker volume ls | grep -w mysql-data >/dev/null; then
+  docker volume create mysql-data
+  echo "Created Docker volume: mysql-data"
+else
+  echo "Docker volume mysql-data already exists."
+fi
+
+echo "Preparation complete."
+

remove-app.sh

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+#!/bin/bash
+# remove-app.sh
+
+docker-compose down
+
+docker volume rm mysql-data
+docker network rm myapp-net
+
+echo "All application resources removed."
+

start-app.sh

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+#!/bin/bash
+# start-app.sh
+
+docker-compose up -d
+
+sleep 5
+
+echo "Application started. Access the web service at http://localhost:8080"
+

stop-app.sh

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+#!/bin/bash
+# stop-app.sh
+
+docker-compose stop
+echo "Application services stopped. Persistent data remains intact."
+