Install apache Tomcat Server in Linux
In this video We are going to install Apache Tomcat in a linux machine for our Devops Practice with Jenkins Tools
*Apache Tomcat* is an *open-source web server and servlet container* developed by the **Apache Software Foundation**. It’s primarily used to **deploy and run Java-based web applications**.
Here’s a breakdown to help you understand it clearly 👇
🧩 *What Apache Tomcat Does*
Tomcat provides a *runtime environment for Java Servlets, JSP (JavaServer Pages), and WebSocket* technologies.
It *receives HTTP requests* from clients (like web browsers), *processes them using Java code**, and **returns dynamic web content* (HTML, JSON, etc.) as a response.
⚙️ *Key Components*
1. *Catalina* – The core servlet container that executes servlets and manages their lifecycle.
2. *Coyote* – The HTTP connector that handles web requests and responses.
3. *Jasper* – The JSP engine that compiles JSP files into servlets.
4. *Cluster, Realm, and Valves* – Provide advanced features like session replication, security, and request filtering.
🌍 *Common Use Cases*
Hosting *Java web applications* (WAR files)
Developing and testing *Spring Boot**, **Java EE**, or **REST API* projects
Learning *Java web development* and *server management*
Integrating with *DevOps pipelines* for continuous deployment
🧠 *Why It’s Popular*
*Lightweight and easy to set up* compared to full Java EE servers (like JBoss or WebLogic)
*Free and open-source*
*Cross-platform* – runs on Linux, Windows, and macOS
Widely used in *production**, **testing**, and **learning* environments
✅ *In short:*
Apache Tomcat = A lightweight, open-source Java web server that powers Java-based web applications.
Perfect 👍 Let’s go step-by-step on *how to install Java JDK on Linux* and set up the *`JAVA_HOME`* environment variable — this works on most modern distributions like **Ubuntu, Debian, CentOS**, or **RHEL**.
☕ Step 1: Check if Java is already installed
Run:
```bash
java -version
```
If it shows something like `command not found`, then Java is not installed yet.
⚙️ Step 2: Install Java JDK
🐧 For *Ubuntu / Debian-based* systems:
```bash
sudo apt update
sudo apt install default-jdk -y
```
🧱 For *CentOS / RHEL-based* systems:
```bash
sudo yum install java-17-openjdk-devel -y
```
(You can replace `java-17-openjdk-devel` with `java-11-openjdk-devel` or another version if needed.)
🔍 Step 3: Verify the installation
```bash
java -version
javac -version
```
You should see something like:
```
openjdk version "17.0.9" 2025-10-01
OpenJDK Runtime Environment (build 17.0.9+10)
OpenJDK 64-Bit Server VM (build 17.0.9+10, mixed mode)
```
🧩 Step 4: Find where Java is installed
Run:
```bash
sudo update-alternatives --config java
```
You’ll see a path like:
```
/usr/lib/jvm/java-17-openjdk-amd64/bin/java
```
Your *JAVA_HOME* is the directory above `/bin`.
So for example:
```
JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64
```
🧭 Step 5: Set the JAVA_HOME environment variable
For the *current session* only:
```bash
export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64
export PATH=$PATH:$JAVA_HOME/bin
```
To make it **permanent**, add those lines to your shell config file:
For **bash**:
```bash
nano ~/.bashrc
```
For **zsh**:
```bash
nano ~/.zshrc
```
Then add:
```bash
export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64
export PATH=$PATH:$JAVA_HOME/bin
```
After saving, reload the config:
```bash
source ~/.bashrc
```
---
✅ Step 6: Verify JAVA_HOME
```bash
echo $JAVA_HOME
```
It should display the correct path.
---
🎯 Done!
Now you have:
Java JDK installed
`JAVA_HOME` configured
System ready for tools like *Apache Tomcat**, **Jenkins**, **Maven**, or **Gradle*
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