Sure! Here's how to create a **custom Apache Tomcat Docker image using a Dockerfile** — similar idea to NGINX, but with a focus on serving Java web applications (`.war` files).

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### 🛠 1. **Create a Project Directory**

```bash
mkdir custom-tomcat
cd custom-tomcat
```

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### 📄 2. **Create a `Dockerfile`**

```Dockerfile
# Use the official Tomcat base image
FROM tomcat:9.0

# Maintainer (optional)
LABEL maintainer="infocusm21@gmail.com"

# Optional: Remove default web apps (cleaner)
RUN rm -rf /usr/local/tomcat/webapps/*

# Copy your WAR file to the webapps folder
# (Assuming you place your .war file in this directory)
COPY webapp-war/* /usr/local/tomcat/webapps/

# Expose Tomcat's default port
EXPOSE 8080

# Start Tomcat (default CMD works, but for clarity:)
CMD ["catalina.sh", "run"]

```

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### 📦 3. **Add Your WAR File**

Place your compiled `.war` file (e.g., `myapp.war`) in the same directory as the Dockerfile.  
If you don’t have a WAR yet, you can just create a dummy one for testing or skip the `COPY` step.

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### 🧱 4. **Build the Docker Image**

```bash
docker build -t my-custom-tomcat .
```

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### 🚀 5. **Run the Container**

```bash
docker run -d -p 8080:8080 --name tomcat-container my-custom-tomcat
```

Open your browser and go to:  
📍 `http://localhost:8080/myapp` — and you should see your web app loading!

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If you want to:
- Deploy multiple `.war` files
- Use a custom `server.xml` or `context.xml`
- Add environment variables for database configs

I can help you extend the Dockerfile or use Docker Compose as well. Let me know what kind of project you’re deploying on Tomcat.