Creating a instance template with tomcat application

• Lets create a image with tomcat application
• Create a ubuntu 18.04 instance and execute the following commands

sudo apt update
sudo apt install openjdk-8-jdk -y
 sudo apt install tomcat8 tomcat8-admin tomcat8-common  tomcat8-docs tomcat8-user -y
 cd /tmp
 wget https://referenceappkhaja.s3-us-west-2.amazonaws.com/gameoflife.war
 sudo cp /tmp/gameoflife.war /var/lib/tomcat8/webapps/gameoflife.war

• Now access the application htpp://publicip:8080/gameoflife
• Now lets try to create a image
• Once the image is created , lets create an instance template
• Ensure you have healthcheck created
• From instance template try to create instance group with minimum 2 instance and max 5 instances
• Wait for the instance template to be launched and the health checks to be successful
• Lets create a loadbalancer with http protocol
  • frontend => http port 80
  • backend => game of life group http port 8080

Exercise:

• Try to create instance template in such a way that your instances will not have public/external ip address
• Then create a load balancer
• This is given as an exercise as in reality we will not create our vms with external ips which are part of instance-group and running our production applications.

Summary

• We have been creating instance templates and instance groups from google console
• We need to find the automation options around it