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Kubernetes and docker

  1. Let's create a Dockerfile for the app in this repo. sha-service is a simple app, that will accept hex values with http post and print it out with http get requests.
Description of the sha-service

Routes:

  • POST: http(s)://$(whatever_name)/api/v1/sha_manager/:branch/:source
  • GET: http(s)://$(whatever_name)/api/v1/sha_manager/:branch/:source

Examples:

  • POST: https://sha-service.com/api/v1/sha_manager/main/src:sha-123456 . note: in src:sha-123456 the : (colon symbol) which divides source and sha is neccessary, given that service can properly parse and save sha related to branch and source.

  • GET https://sha-service.com/api/v1/sha_manager/main/src. note: on GET you just specify branch and source, if something is stored under that path, you will get the result, in this case the result will be sha-123456.

  1. Build, name and tag docker image for the app. The name should be: ghcr.io/powr/sha-service, add whatever tag you want. You may need default-libmysqlclient-dev wget ruby-mysql2 packets from debian in order to start the app in docker.

You also need to pass RAILS_ENV as a build time argument to be equal to development when building the image in order to use local database.

  1. Let's bring an up and working mysql db installation:
docker run --name shadb -p 3306:3306 -e MYSQL_ROOT_PASSWORD=123qwe -e MYSQL_DATABASE=shadb mysql:latest

Now start sha-service container and check if it's able to communicate with DB. For some installations you might need to perform

docker inspect -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' shad

and copy it's output IP to config/database.yml host section. Don't forget to revert this change back because we'll need default configuration for the next step.

  1. You'll need a working minikube installation that works with your docker for this step, or if you have docker-desktop just enable kubernetes in the settings. Now create a simple kubernetes deployment for the sha-service docker container that you've just built and also forward port 3000. Make a curl post and get requests to the sha-service app, that you just deployed and see if it works.