Intro to kubernetes

Instructor email: mailto:cludwig@instantbrains.com LinkedIn: https://www.linkedin.com/in/chris-ludwig/

Learning objectives

• What’s the minimum hardware setup needed to use kubernetes as a home lab?
• How would I set up a hybrid cloud burst pattern that scales down to minimal/zero cost?
  • Use rancher
• How could I set up continuous delivery through github actions with auto semver bumping?

Questions

Question: Is the idea that each microservice would be managed by a separate team or would a single team manage all the micro services for an application?

• How would you connect nodes from a different network? Would the kube-proxy work across networks?
  • Set up a vpn to “fool” k8s into seeing them all on the same network.
• Why do deployments have unique Ids but pods don’t?
  • Deployed pods are part of a replica set. Pods are named replica set id + unique pod id
• Are ClusterIP service and ingresses exposed on all nodes, or just the control plane nodes, or just the worker node with the pod?
• How do containers reference each other when deployed on separate pods? Same service and different service.
  • Service name or pod IP
• Are selectors OR’d or AND’d? e.g. in a deployment or a service
  • OR’d
• For a web service that only supports https, does it matter if you specify both port 80 and 443 or just forward everything to port 80?
• How do you apply labels to nodes in yaml?
  • it’s possible
• How would you pass secrets from CI to manifest files?
  • Yes, but might require string replacement