Task 1 - Creating Tomcat student-ui container

Instructions

• Get the docker image of Amazon linux
• Add tomcat package
• Add student ui
• Then commit the image
• Store on ecr as well as on docker hub

Steps Performed

Step 1: Getting the the Amazon Linux Image Upon searching the for amazonlinux image in dockerhub I found its official image I pulled it into the system with docker pull amazonlinux

sudo docker run -it -d -p 32768:8080 --name tomcat-student-ui amazonlinux`

and I run the image interactively and in detached mode so i can execute shell command later on

Lets dive into the container

sudo docker exec -it <containerid> <shell-command>`

Step 2: Installing tomcat application

Our App student-ui required specific version of tomcat thats why we gonna install it from source

Make sure to install dependancies and unzip package before hand

Step 3: Install tomcat from source

Install this specific version from source

cd /opt # we can use this directory for temporary space
curl -O https://dlcdn.apache.org/tomcat/tomcat-9/v9.0.98/bin/apache-tomcat-9.0.98.zip
unzip apache-tomcat-9.0.98.zip # unzip the archive
yum install java-17 -y # tomcat 9 requires java-17 to work properly
cd apache-tomcat-9.0.98/bin/
bash ./catalina.sh start 

It looks like our tomcat server is up and running on desired port

Step 4: Installing Student-ui

but first we need these package building tools git and maven for building our student-ui app

Installing git and maven

sudo yum install git maven -y

Clone the student-ui repo

git clone https://github.com/Pritam-Khergade/student-ui

build student-ui app using maven

cd student-ui
mvn clean package

this creates .war file in ./target folder rename it to suitable short name and move to /opt/apache-tomcat-9.0.98/webapps directory

mv target/studentapp-2.2-SNAPSHOT.war target/studentapp.war
mv target/studentapp.war /opt/apache-tomcat-9.0.97/webapps/

and the app should be accessible on tomcat server on http://instance-ip:32768/studentapp

Create the image out of this running container

Before creating the image its better to remove the unnecessary packages that we no longer need to make the size of the image minimal as possible.

Cleanup the no-longer needed packages to reduce size of image

yum remove maven git unzip -y

Lets exit from container shell and build the image

sudo docker commit <container-id>

You see the created image doesnt have any name so lets give it a tag

sudo docker tag <image-id> <newtag>

now push it to docker hub and ECR

Uploading image to docker hub

First create a repository at docker hub

• Login to docker hub
• Click on repositories
• Create new repository
• Give it proper name and click create

Here is my repo looks llike

Lets push our image into this repo First rename add new tag to image appropriate according to docker hub repo name

sudo docker tag <old-tag-name> <newtag-name>

and now push it to docker hub

sudo docker push archsarangx/tomcat-student-ui:latest

and its successfully uploaded on docker hub at and anyone can pull it with

docker pull archsarangx/tomcat-student-ui:latest

Uploading image to ECR

Step 1: Creating the repository at ECR

• goto amazon ECR service and create repositoy

then click on blue repo name and click on view push commands

Step 2: Authenticate with ECR

aws ecr get-login-password --region us-west-2 | docker login --username AWS --password-stdin 970547378605.dkr.ecr.us-west-2.amazonaws.com

Step 2: Add Tag name to image

“

docker tag archsarangx/tomcat-student-ui:latest 970547378605.dkr.ecr.us-west-2.amazonaws.com/archsarangx/tomcat-student-ui:latest

docker push 970547378605.dkr.ecr.us-west-2.amazonaws.com/archsarangx/tomcat-student-ui:latest

🎉 And our Image is successfully uploaded on both ECR and docker hub.

Thank you for reading

Have a good day!