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Exercise 2.08

Prompt

  • Create a database and save the todos there. Use Secrets and/or ConfigMaps to have the backend access the database.

Get started: Copy directory ex-2-04-v-1.1 as ex-2-08-v-1.2

Hint

  • Mock ex-2-07
  • Use kubectl create namespace todotest
  • Add files to manifests to add a stateful postgres database, db-configmaps, and postgres service
  • Update the todo app so that we refer to database instead of in memory json file

Test

- Open http://localhost:8081/. Wait for 5 seconds if it says "postgres-svc" is not found yet. Now go delete both todo app pod and postgres pod. Once both pods are back check http://localhost:8081/. If http://localhost:8081/ root page shows an image and todo app, then we know it works.

Notes:

  • To add a defualt namespace, you have to manually add kubectl config set-context --current --namespace=<name>

Solution

- cd to this directory, run `make relaunch-cluster` and check http://localhost:8081/. Now go delete both todo app pod and postgres pod. Once both pods are back check http://localhost:8081/.

Source: DevOps with Kubernetes