DevOps Classroom Series – 27/Jan/2020

Manual Creation of Apache Server

• Scenario: Creating an Apache Server
• Sol:
  • Create an ubuntu server
  • ssh into ubuntu server
  • execute the following commands

  sudo apt-get update
  sudo apt-get install apache2 -y
  

  • Browse to http://<publicip&gt;

Creating a Docker Image for Apache Server

• Approach:
  • Search for ubuntu in Docker hub to choose base image
  • Execute some commands while building apache image (to convert base image into apache server image)

  sudo apt-get update
  sudo apt-get install apache2 -y
  

• Solution:
  • Create a file with name Dockerfile and add following contents

  FROM ubuntu
  RUN "apt-get update"
  RUN "apt-get install apache2 -y"
  

  • Using this Dockerfile build a docker image using

  docker image build -t myapache .
  

Installing Docker on Linux Platforms

• Simple Approach:
  • Always installs the latest version

  curl -fsSL https://get.docker.com -o get-docker.sh
  sh get-docker.sh
  

  • add user to the Docker Group

  sudo usermod -aG docker <username>
  

  • Logout and login into the linux machine

  docker info
  

Manual Creation of Spring-Petclinic (Spring Boot)

• Install JAVA
• Download Spring pet clinic from here
• Run the command java -jar spring-petclinic-2.2.0.BUILD-SNAPSHOT.jar

Docker image creation for Spring-Petclinic

• Find a base-image with java already installed. In this example i would be using openjdk:8
• Dockerfile

FROM openjdk:8
RUN wget https://war-jar-files.s3-us-west-2.amazonaws.com/spring-petclinic-2.2.0.BUILD-SNAPSHOT.jar
EXPOSE 8080
CMD ["java", "-jar", "spring-petclinic-2.2.0.BUILD-SNAPSHOT.jar"]

• Build the image

docker image build -t spc .
docker image ls

• Create the container from image

docker container run -d -p 8081:8080 spc
docker container ls

• Navigate petclinic using http://<vmip&gt;:8081

Dockerfile Instructions

• Instructions are phrases in the Dockerfile with some Behaviors
• For complete list of instructions refer here
• FROM => to choose the base image
• RUN => execute the command while building the image
• EXPOSE => to expose ports used by container
• CMD => command to be executed while container creation