Kubernetes test setup

Barebones Ruby on Kubernetes test setup. Mostly following the instructions in https://kubernetes-rails.com

Build the image:

docker build --build-arg revision=$(git rev-parse HEAD) -t appsignal/kubetest:latest .

Then run it and check that it works:

docker run -p 4567:4567 appsignal/kubetest:latest

If this works you can push the image:

docker push appsignal/kubetest:latest

And run a cluster, if kubernetes is on on your local docker instance:

kubectl apply -f k8s

Check that everything is running:

kubectl get pods

And you can now open the app on http://localhost:4567.

To delete the deployment run:

kubectl delete -f k8s

To deploy the latest version of the image:

kubectl rollout restart deployment.apps/kubetest-deployment

Terraform Deployment (Alternative)

As an alternative to manual kubectl commands, you can use Terraform to manage the deployment:

cd terraform
terraform init
terraform apply

The app will be available at http://localhost:4567

For full documentation including configuration options, see terraform/README.md.

To tear down the infrastructure:

terraform destroy

Console access

To prod around with bash get a pod name (kubetest-deployment-7ddc65cb8b-zcrhd, for example):

kubectl get pod -o wide

NAME                                   READY   STATUS    RESTARTS   AGE     IP         NODE             NOMINATED NODE   READINESS GATES
kubetest-deployment-7ddc65cb8b-zcrhd   1/1     Running   0          5m19s   10.1.0.6   docker-desktop   <none>           <none>

And run:

kubectl exec -it kubetest-deployment-7ddc65cb8b-zcrhd -- bash

Logs

To tail the logs for a pod:

kubectl logs kubetest-deployment-7ddc65cb8b-zcrhd --follow