Ops Interview Task

prerequisite

1. VirtualBox (https://www.virtualbox.org/)
2. Vagrant (https://vagrant.io)
3. jq (sudo apt-get install jq | brew install jq)
4. minikube (https://kubernetes.io/docs/tasks/tools/install-minikube/)
5. ansible (https://docs.ansible.com/ansible/latest/installation_guide/intro_installation.html)

Task

• Create a Dockerfile for the app
• Create a docker-compose.yml for the app
• Write a bash script that creates and boots Vagrant box with Ubuntu.
• Using Ansible provision the VM to
  • Setup hostname of VM as demo-ops
  • Create a user demo
  • Configure sysctl for sane defaults. For eg: increasing open files limit. Configure a variety of sysctl settings to make the VM a production grade one.
  • Set the system's timezone to "Asia/Kolkata"
  • Install Docker and Docker-Compose
  • Configure Docker Daemon to have sane defaults. For eg: to keep logs size in check.
  • Deploy the docker-compose.yml in /etc/demo-ops and start the services

Make sure you have ssh key located at ~/.ssh/ as vagrant will pick key from there to configure ubuntu machine. ssh-keygen

Steps

1. chmod +x main.sh

2. Deploy Vagrant ubuntu machine and configure it using ansbile. (script will configure ansible inventory file by fetching vagrant machine ip and placing it in ansible-playbook/inventory)

   ./main.sh start

   When prompt, select network interface to which internet is connected

   

3. Once deployment is done you can see logs printed on terminal perfoming health check.

   

   you can also verify manually by running following command

   vagrant ssh -c "curl localhost:8000"

4. To destroy VM simply run following command

   ./main.sh stop

Bonus

1. To deploy over k8s run following command

   ./main.sh k8s

   it will create deployment from mainifest file located in k8s directory. the script will first create Namespace then deploy redis app, while loop have been placed in script for pod status check it will run until pod status is RUNNING once condition is met loop will break and script will deploy go-app same will be done for go-app pod. once deployment is completed script will fetch minikube IP and run curl IP:NodePort to check requests are served from pod.

   

2. delete deployments

   ./main.sh k8sremove

Help

./main.sh

Refrences

https://docs.ansible.com/ansible

https://www.vagrantup.com/docs

https://kubernetes.io/docs/home/