dockerfiles/tomcat

Clear Linux* OS tomcat container image

What is this image?

clearlinux/tomcat is a Docker image with tomcat running on top of the official clearlinux base image.

Tomcat is an open source implementation of the Java Servlet, JavaServer Pages, Java Expression Language and Java WebSocket technologies.

For other Clear Linux* OS based container images, see: https://hub.docker.com/u/clearlinux

Why use a clearlinux based image?

Clear Linux* OS is an open source, rolling release Linux distribution optimized for performance and security, from the Cloud to the Edge, designed for customization, and manageability.

Clear Linux* OS based container images use:

• Optimized libraries that are compiled with latest compiler versions and flags.
• Software packages that follow upstream source closely and update frequently.
• An aggressive security model and best practices for CVE patching.
• A multi-staged build approach to keep a reduced container image size.
• The same container syntax as the official images to make getting started easy.

To learn more about Clear Linux* OS, visit: https://clearlinux.org.

Deployment:

Deploy with Docker

The easiest way to get started with this image is by simply pulling it from Docker Hub.

*Note: This container uses the same syntax as the official tomcat image.

1. Pull the image from Docker Hub:

   docker pull clearlinux/tomcat
   

2. Start a container using the examples below:

   docker run --rm -it --hostname my-tomcat --name some-tomcat -p 8080:8080 clearlinux/tomcat
   

Deploy with Kubernetes

This image can also be deployed on a Kubernetes cluster, such as minikube.The following example YAML files are provided in the repository as reference for Kubernetes deployment:

• tomcat-deployment.yaml: example using default configuration to create a basic tomcat service.

• tomcat-deployment-index-custom.yaml: example using your own custom index html to create a tomcat service.

• tomcat-deployment-conf-custom.yaml: example using your own custom configuration to create a tomcat service.

Steps to deploy tomcat on a Kubernetes cluster:

1. If you want to deploy tomcat-deployment.yaml

   kubectl create -f tomcat-deployment.yaml
   

   Or if you want to deploy tomcat-deployment-index-custom.yaml

   kubectl create -f tomcat-deployment-index-custom.yaml
   

   Or if you want to deploy tomcat-deployment-conf-custom.yaml

   kubectl create -f tomcat-deployment-conf-custom.yaml
   

2. Navigate to http://<nodeIP>:30001 in your browser, where 30001 is the port number defined in your service.

Build and modify:

The Dockerfiles for all Clear Linux* OS based container images are available at https://github.com/clearlinux/dockerfiles. These can be used to build and modify the container images.

1. Clone the clearlinux/dockerfiles repository.

   git clone https://github.com/clearlinux/dockerfiles.git
   

2. Change to the directory of the application:

   cd tomcat/
   

3. Build the container image:

   docker build -t clearlinux/tomcat .
   

   Refer to the Docker documentation for default build arguments. Additionally:

   • swupd_args - specifies arguments to pass to the Clear Linux* OS software manager. See the swupd man pages for more information.

Licenses

All licenses for the Clear Linux* Project and distributed software can be found at https://clearlinux.org/terms-and-policies