Provisioning a KYMA instance on SAP BTP

This blog shows, how to install postgres, kafka and redis on a Kubernetes cluster here SAP® KYMA.

Enable SAP BTP, Kyma Runtime | SAP Tutorials

Got to the SAP BTP site: https://account.hanatrial.ondemand.com/

Enable KYMA in BTP: https://developers.sap.com/tutorials/cp-kyma-getting-started.html

Sizing of the KYMA Cluster in the Trial Account: https://help.sap.com/docs/btp/sap-business-technology-platform/about-trial-account

Install local tools

Install Ubuntu on WSL2 and get started with graphical applications: https://ubuntu.com/tutorials/install-ubuntu-on-wsl2-on-windows-11-with-gui-support#1-overview
Install kubectl: https://kubernetes.io/docs/tasks/tools/

Update the config in .kube environment
1. Copy the kubeconfig URL from the BTP Site, download the file

2. Rename the file to config and put it in the .kube directory (in your home directory)

Installing Pods on KYMA Cluster

– Postgres DB

kubectl apply -f ./Step1_Setup/k8s/postgres

Test Postgres

kubectl exec -it <postgres_pod> — psql -U postgres

Find useful commands for postgres here:

https://docs.vmware.com/en/VMware-SQL-with-Postgres-for-Kubernetes/1.9/tanzu-postgres-k8s/GUID-accessing.html

– Kafka, Zookeeper, AKQH

Before deployment, update the HOSTNAME in the /k8s/kafka/akhq-api-rule.yaml file

Get the hostname as in the screenshot:

or apply the following command:

kubectl get gateway kyma-gateway -n kyma-system -o=jsonpath='{.spec.servers[0].hosts[0]}’
“`

Then apply the .yaml files.

kubectl apply -f ./Step1_Setup/k8s/kafka
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– Redis

kubectl apply -f /k8s/redis
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Test the Kafka Connection

-Deploy testclient

kubectl apply -f /Step1_Setup/k8s/kafkatestclient.yaml
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-Create Topic
kubectl exec -ti testclient — ./bin/kafka-topics.sh –zookeeper zookeeper:32181 –topic messages –create –partitions 1 –replication-factor 1

-Check Topic

kubectl exec -ti testclient — ./bin/kafka-topics.sh –zookeeper zookeeper:32181 –list
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-Create a listener for the topic ( open a new terminal session for this)

kubectl exec -ti testclient — ./bin/kafka-console-consumer.sh –bootstrap-server kafka:29092 –topic messages –from-beginning

-Create a producer for the topic ( open a new terminal session for this)

kubectl exec -ti testclient — ./bin/kafka-console-producer.sh –broker-list kafka:29092 –topic messages

Enter a message in the producer terminal session, this should be shown in the listener session.

Test the AKHQ Website

The AKQH website shows the topics created. You have to forward the local port, here to 9090 local

kubectl port-forward <akhq-pod> localport:8080
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Open your browser and enter the URL

localhost:9090/akhq

See the Kafka topics an messages.

Code is available from Github Repository: https://github.com/mizmauz/heureso_kyma