Kubernetes experiments

• Basic notes on Kubernetes & Helm - at ./kube
• Launching minikube, configuring RBAC/ABAC - at ./kube/config/{abac|rbac}

Github Actions & Packages

• see ./github/ for a pipeline (only 1 job)
• see Packages at github repo - there will be a docker image available

Pushing image:

• login at Packages
  • get token with packages:* permissions
  • cat GITHUB_PACKAGES_TOKEN | docker login https://docker.pkg.github.com --username avbelyaev --password-stdin
• build, tag (docker.pkg.github.com/avbelyaev/k8s-rbac-experiments/flask-sample) and push

Notes on using this sample flask app

• connect (e.g. with Mongo Explorer - Intellij Idea plugin) with the following creds:

  • uri: localhost:27017
  • creds: admin/admin
  • auth database: kube
  • mechanism: scram

• example request to save json from body:

curl -X POST localhost:5000/api/docs -H 'content-type: application/json' -d '{"hello": "world"}'

or same via HTTPie:

http localhost:5000/api/docs hello=world

• venv:

pip3 install virtualenv
virtualenv venv --python python3
# export LC_ALL=C in case of unsupported locale
source venv/bin/activate
pip install -r requirements.txt 

• build actions:

docker build -t flask .
docker run -p 5000:5000 flask
docker exec -it <cnt_id> sh

• run Flask in dev mode == setting env FLASK_ENV=development

• running tests: pytest from here. or pytest backend/tests if not tests found

• to write messages from print straight to container's stdout, use print = partial(print, flush=True) which flushes buffer (and writes data) immediately