DevOps Classroom Series – 22/Jun/2020

Revision To Docker (Topics Covered So far)

• Refer to Docker Earlier classroom notes

Practical Revision

1. Create a Docker Image for Game of Life

   • Install JAVA
   • Install Tomcat
   • Download gameoflife from here into webapps folder of tomcat
   • Start tomcat => (http://<ip&gt;:8080/gameoflife)
   • Possible Solution-1
     1. Start with Ubuntu or centos as base image
     2. Install JAVA
     3. Install tomcat
     4. Find the location of webapps
     5. download the war file
     6. Start application

     FROM ubuntu:18.04
     RUN apt-get update && apt-get install openjdk-8-jdk tomcat8 -y
     ADD https://referenceappkhaja.s3-us-west-2.amazonaws.com/gameoflife.war /var/lib/tomcat8/webapps/gameoflife.war
     EXPOSE 8080
     

   • Possible Solution -2
     1. Start with Tomcat as base image
     2. Copy the war file
     3. start tomcat
   • Dockerfile

   FROM tomcat:8
   LABEL author="khaja"
   ADD https://referenceappkhaja.s3-us-west-2.amazonaws.com/gameoflife.war /usr/local/tomcat/webapps/gameoflife.war
   EXPOSE 8080
   CMD ["catalina.sh", "run"]
   

2. Slim Images for Linux applications

   • Popularly alpine image is used
   • Explore alpine image and try to build gameoflife and spc in alpine