This is a take-home project assigned to Siddharth.

• Dockerize the Caching service app

Prerequisites:

1. I prefer Ubuntu 16.04
2. Docker
3. Redis Cluster
4. PEM key for Ec2 instances

1. Create a docker repository on Docker Hub. (You should already have an account)
2. Login into your docker account from the local machine docker login
3. Insert your credentials
4. Create a GitHub public repository and clone it on the local system.
5. Create a DockerFile (Please refer to the Dockerfile on this repository)
6. Add the python file
7. Build the docker image docker build -t <username>/caching-service
8. Check the images by running docker image ls
9. Run the docker container by running this command docker run -p 3000:3000 -e PORT=3000 -e REDIS_URL=http://34.208.xxx.49 <username>/caching-service
10. REDIS_URL and PORT are declared as env variables.
11. Check the container name & status by running this command docker ps
12. Tag the docker service by docker latest caching-service:latest caching-service:latest
13. Finally, push your image to the docker hub repository by running this command docker push <username>/caching-service

Dockerfile

• Deploy your service to Heroku

1. Install Heroku on the local machine using snap install --classic heroku
2. heroku login not required as opposed using an API key
3. Store your API key in ~/.netrc file
4. Create a heroku.yml file with all required dependencies - heroku.yml
5. Install Heroku container registry plugin by using heroku plugins:install @heroku-cli/plugin-container-registry
6. Change the login mode to Heroku container by typing heroku container : login
7. Create a Heroku container app by using heroku create -a <appname>
8. Push the container by hitting heroku container:push web -a <imagename>
9. Release the container by using heroku container:release web -a <imagename>
10. Open the created app by using heroku open
11. All the above steps are automated on shell script- gumgum.sh

• Build a Drone deployment pipeline

1. Create a Drone CI account and authenticate with your GitHub account.
2. Create a Git Webhook and add the Drone CI authentication token and payload URL https://cloud.drone.io (grab token from the user settings page on Drone CI) and create the action triggers. The below image describes the process.
3. Create a .drone.yml file for all running dependencies to trigger a build step.

• Multi-key support Script was improved by closely matching the requirement - extended.py

Slack Channel Alert

1. The drone.yml file has this code appended at the bottom
2. Grab the Slack webhook from the Administration -> Applications -> Webhooks page on your Slack Admin Workspace
3. Attach the webhook to a channel of your choice
4. Insert these details on the script above

steps:
- name: slack
  image: plugins/slack
  settings:
    webhook: <https://hooks.slack.com/services/...>
    channel: <your channel>
    link_names: true
    template: >
      {{#success build.status}}
        build {{build.number}} succeeded. Good job. <your email>
      {{else}}
        build {{build.number}} failed. Please fix this <@channelname> <@someone>
      {{/success}}