Introduction
A Dockerfile is a script that having the command and while deployment the docker image container We will get up and running service which configured with commands.
Prerequisites
- Basic knowledge of Docker.
- Basic knowledge of Linux commands.
Step 1: Create a Tomcat Directory
To begin, we set up a directory just for Apache-related files by employing the mkdir command.
mkdir tomcatStep 2: Create a Dockerfile
Now that we have created a folder, we can use the nano editor to create a Dockerfile within that folder:
nano DockerfilePaste the following commands.
FROM ubuntu:latest
RUN apt-get update && apt-get upgrade -y
RUN apt-get install -y default-jdk
RUN apt-get install -y tomcat8
EXPOSE 8080
CMD ["/usr/share/tomcat8/bin/catalina.sh", "run"]
Save and exit from the nano text editor.
This Dockerfile uses the latest version of Ubuntu as the base image. It then runs apt-get update and upgrade to make sure all packages are up to date. It installs the default-jdk package and tomcat8 package using apt-get install. The EXPOSE command tells Docker that the container will listen on port 8080. The CMD command starts the tomcat8 service using the catalina.sh script. Note that this is a basic setup and you may need to configure the tomcat8 for your specific needs and also you may want to copy your war files to the webapps folder of tomcat8.
Step 3: Building Nginx Docker Image
The docker build command is now used to construct the Dockerfile. within which we give our image a custom name (such as tomcat_image) and tag it with the 1.0.0 suffix.
docker build -t tomcat_image:1.0.0 .The docker images command should be used to verify the image’s existence after it has been constructed.
We can see a list of all the images that have been created or obtained from any public or private registry using the docker images command.
Step 4: Deploy Tomcat Container
Run the image locally as a container after it has been built:
We use detached mode to run the container continuously in the background. In the docker run command, include -d.
We provide port 8080 (HTTP) for the tomcat server in order to host it. To have the server run on localhost, use -p 8080:8080.
As a result, the docker run command also uses the image and the tag that goes with it as input to run the container.
docker run --name custom_tomcat -d -p 8080:8080 tomcat_image:1.0.0Step 5: Testing Tomcat Test Page
Go to any local browser and type localhost to see if the Apache tomcat server is present.
Conclusion
We have successfully build tomcat custom image from scratch dockerfile on ubuntu 22.04 LTS, If you still have questions, please post them in the comments section below.
