Day 4 - Docker Tutorial: Create a Dockerfile to Deploy a WAR File in Tomcat (Step-by-Step Guide)
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Welcome to Day 4 of our Docker Tutorial Series! In this hands-on video, you'll learn how to create a Dockerfile from scratch to deploy a Java WAR file into a Tomcat container. This is a must-know skill for developers and DevOps engineers looking to automate application deployment.
🔍 What You Will Learn:
00:11 - 01:16 📄 Intro to Dockerfile: Explains what a Dockerfile is and its purpose in building custom Docker images.
01:16 - 02:41 🧱 Dockerfile Contents: Describes writing source code and dependencies into Dockerfile to build an image.
02:41 - 04:02 🛠️ Building & Running: Clarifies how Dockerfile creates images that spawn containers to run applications.
04:02 - 05:53 ☕ Java App Deployment: Plans to dockerize a Java app using Java, Tomcat, and an OS as dependencies.
05:53 - 06:32 📚 Dockerfile Keywords: Introduces key Dockerfile instructions like `FROM`, `RUN`, `COPY`, `CMD`, etc.
06:32 - 09:02 🏗️ FROM Instruction: Demonstrates use of `FROM` to specify base image like Ubuntu, RedHat, or Amazon Linux.
09:02 - 11:51 🔍 JDK in Base Image: Discusses availability of JDK in base images and navigating AWS for setup.
11:51 - 15:54 ⚙️ Docker Setup: Installs Docker, adds user to Docker group, and starts Docker service on EC2.
15:54 - 17:18 📥 Pulling JDK Image: Pulls prebuilt Docker image with Java (OpenJDK) pre-installed.
17:18 - 20:28 🔎 Image Inspection: Views Docker image details and validates Java version installed.
20:28 - 23:37 🧪 Running Java Code: Executes sample Java code inside the container to validate setup.
23:37 - 26:04 🐳 Base Image + Tomcat: Explains layering Java and Tomcat on Amazon Linux to prepare deployment.
26:04 - 28:23 👤 MAINTAINER & PORT: Covers optional `MAINTAINER` keyword and Tomcat’s default port configuration.
28:23 - 30:55 📁 WAR File Upload: Uploads WAR file and prepares to copy it to Tomcat’s deployment directory.
30:55 - 34:26 📂 Tomcat Directory: Locates the correct Tomcat deployment path inside the Docker container.
34:26 - 36:48 🔄 Dockerfile Recap: Reviews Dockerfile steps—selecting base image, installing Java/Tomcat, and WAR deployment.
36:48 - 39:20 🧰 Java Install Commands: Details `RUN` steps to install Java inside the Dockerfile using shell commands.
39:20 - 41:47 📦 WAR Extraction: Downloads, extracts, and places WAR file contents into Tomcat webapps directory.
41:47 - 44:06 🚀 Tomcat Startup: Uses `sh startup.sh` to launch Tomcat server and deploy the app in the container.
44:06 - 46:30 📤 Finalizing Dockerfile: Finalizes `COPY`, `RUN`, and startup instructions in Dockerfile.
46:30 - 47:56 🔨 Build Docker Image: Builds custom image using `docker build -t image-name .` command.
47:56 - 49:05 🧪 Testing Image: Confirms custom image creation and previews container usage (detailed next session).
49:05 - 50:27 📤 Port Forwarding Preview: Mentions need for port forwarding to access deployed app—covered in next class.
50:27 - 51:41 🎓 Session Wrap-Up: Reviews complete workflow of creating image from Dockerfile and running the app.
51:41 - 52:40 💬 Feedback & Closing: Requests learner feedback and ends session with preview of upcoming topics.
Notes : https://www.notion.so/srtechops/Day-4...
By the end of this tutorial, you’ll be able to containerize your Java applications with ease using Docker and Tomcat.
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