Day 2 Docker Assignment

How to Develop an Image

1. Run a Container in itd mode with ubuntu image docker run -itd ubuntu

2. Go into the container with execute command.
   docker exec -it 2cfdc788d068 /bin/bash

3. Install Java
   Download and Install JDK/JRE 11 in Ubuntu
   apt-get update
   apt-get install openjdk-11-jdk -y
   apt install openjdk-11-jdk-headless -y

4. Install Apache2
   Command – apt-get install apache2 -y

5. Exit from Container

6. Search and download Sample.war file and click on the link -> copy link address.

We can see sample.war file is available.

1. Install wget command and provide permission.
   Command - yum install wget -y

2. Copy the sample.war file to the container.
   Command: docker cp sample.war 2cfdc788d068:/opt

3. Validate we have everything we require.
   Like – Java, Apache2, Sample.war
   $ docker exec 2cfdc788d068 java

4. Commit – create the image
   $docker commit -m"ub-java-apache2-app" -a"jawahar" 2cfdc788d068 managerapp

5. Create the container from the image
   $docker run -itd --name manager managerapp

6. Verify everything we require is there in container “manager”
   $ docker exec manager java

$ docker exec manager which apache2
$ docker exec manager ls /opt

How to share the image

1. Create a tarball file
   $ docker save -o managerapp.tar managerapp

2. Load Image
   $docker load -i managerapp.tar

Share the image with Team – Docker Registry.

1. Create a registry on docker hub
   jawahar108/devopsmanagerapp general | Docker Hub

2. Login to hub.docker.com with your docker user name and password.
   $ docker login

3. Tag Docker Images or Alias the image
   $ docker tag managerapp jawahar108/devopsmanagerapp

4. Push the image to docker
   $ docker push jawahar108/devopsmanagerapp

Refresh the docker and click on Public View

jawahar108/devopsmanagerapp - Docker Image | Docker Hub
Docker Pull Command
docker pull jawahar108/devopsmanagerapp

Share the url with manager.
jawahar108/devopsmanagerapp - Docker Image | Docker Hub

Thank You!