Tomcat deployment on Kubernetes

Overview

Tomcat deployment on Kubernetes-

Deploying Apache Tomcat on Kubernetes involves encapsulating Tomcat and your web application in Docker containers. Kubernetes orchestrates containers, manages deployment, scaling and networking. Using Deployment manifests, Services for networking, and Persistent Volumes for storage, you define your Tomcat application’s desired state. Kubernetes handles load balancing, health checks, and automatic scaling based on demand. This combination ensures a scalable, flexible, and automated deployment of Tomcat within a containerized environment.

Tomcat

Is an open-source application server developed by the Software Foundation. It implements the Java Servlet, Java Server Pages (JSP), and Java Expression Language technologies, providing a platform for deploying and running Java-based web applications.

Read Also – Jenkins deployment on kubernetes

Prerequisites

A running Kubernetes cluster. You can use a managed Kubernetes service or set up a cluster locally using a tool like Minikube.
The Kubectl command-line tool is installed and configured to connect to your Kubernetes cluster.

Step 1: Start Minikube Cluster

Open a terminal and start your Minikube cluster

$minikube start

$minikube status

$minikube dashboard

Step 2: Create a Tomcat Deployment

Let’s start by creating a basic Tomcat Deployment using a Kubernetes YAML file. Save the following content into a file named tomcat-deployment.yaml.

$sudo nano tomcat-deployment.yaml

apiVersion: apps/v1

kind: Deployment

metadata:

name: tomcat-deployment

spec:

replicas: 3 # Adjust the number of replicas as needed

selector:

matchLabels:

app: tomcat

template:

metadata:

labels:

app: tomcat

spec:

containers:

- name: tomcat

image: tomcat:latest # Use the appropriate Tomcat image version

ports:

- containerPort: 8080 # Expose the port that Tomcat uses

$kubectl create ns tomcat-namespace

$cat tomcat-deployment.yaml

$kubectl create -f tomcat-deployment.yaml

$kubectl get ns

Step 3: Create a Tomcat Service

Now, let’s create a Service to expose the Tomcat deployment. a file named tomcat-service.yaml

$sudo nano tomcat-service.yaml

kind: Service

metadata:

name: tomcat-service

namespace: tomcat-namespace

spec:

selector:

app: tomcat

ports:

- protocol: TCP

port: 8080 # Port exposed by the Tomcat deployment

targetPort: 8080 # Port the container listens on

type: NodePort

$kubectl create -f tomcat-service.yaml

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Mahesh Wabale

Admin at DevOpsLover.com

Mahesh Wabale is the admin & author of this blog, Technology enthusiast with interest in DevOps, CICD, Spring Boot, Microservices Architecture He has more than 7 years of experience in IT industry, programming language and development stuff. He loves to share his experience with his blog.