DEV Community

Cover image for How to use the K8ssandra operator
Abhijith Ganesh
Abhijith Ganesh

Posted on

How to use the K8ssandra operator

#devops #kubernetes #cassandra #helm

What is K8ssandra?

It is the kubernetes cluster version of the Database Apache-Cassandra along with Stargate, Prometheus operators, it is a simple and quick method to setup a near-full stack of the database instance

Requisites:

  • 4 CPU cores
  • 8128 MB

Software Requirements:

  • Minikube
  • Helm (v3)

Installation

  • Install the Rancher Local path provisoner by running the command
    kubectl apply -f https://raw.githubusercontent.com/rancher/local-path-provisioner/master/deploy/local-path-storage.yaml

  • Add the lightweight K8ssandra chart running the following command
    helm repo add dokc https://dokc.github.io/Helm-Charts/

  • Check whether the repo was installed

helm repo list

It must show something like this:

NAME URL cassandra https://helm.k8ssandra.io/stable traefik https://helm.traefik.io/traefik minio https://helm.min.io dok https://dokc.github.io/Helm-Charts/
Enter fullscreen mode Exit fullscreen mode

The chart now has been configured for installation, to install the K8ssandra Chart

You can run the k8ssandra configuration yaml with the chart

 cassandra: version: < Cassandra Version Number, preferred version = 4.0.1 > cassandraLibDirVolume: storageClass: local-path size: 5Gi allowMultipleNodesPerWorker: true heap: size: 1G newGenSize: 1G resources: requests: cpu: 1000m memory: 2Gi limits: cpu: 1000m memory: 2Gi datacenters: - name: < Data Center Name > size: < Size > racks: - name: < Rack Name > kube-prometheus-stack: grafana: adminUser: < Grafana Admin User > adminPassword: < Grafana Password > stargate: enabled: < Boolean > replicas: 1 heapMB: 256 cpuReqMillicores: 200 cpuLimMillicores: 1000
Enter fullscreen mode Exit fullscreen mode

To run this:
helm install <cluster_name> dok/k8s-lightweight -f <filename>.yaml

This will run your Kubernetes cluster, To check the pods that are running, you can run the kubectl get pods and it must be like this

NAME READY STATUS RESTARTS AGE prometheus-test-dep-kube-prometheus-s-prometheus-0 2/2 Running 0 2m43s test-dep-cass-operator-6c75d6d684-vh2ts 1/1 Running 0 2m45s test-dep-datacenter1-default-sts-0 2/2 Running 0 2m28s test-dep-datacenter1-stargate-699f64f646-w85kw 1/1 Running 0 2m45s test-dep-grafana-57fd996d9-c58tf 2/2 Running 0 2m45s test-dep-kube-prometheus-s-operator-767fc8984c-9rlmj 1/1 Running 0 2m45s
Enter fullscreen mode Exit fullscreen mode

** The pods may take up to 4 minutes to setup, please be patient **

Once the pods are setup, you can run kubectl get services

NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 144m prometheus-operated ClusterIP None <none> 9090/TCP 33s test-dep-dc-test-additional-seed-service ClusterIP None <none> <none> 32s test-dep-dc-test-all-pods-service ClusterIP None <none> 9042/TCP,8080/TCP,9103/TCP 32s test-dep-dc-test-service ClusterIP None <none> 9042/TCP,9142/TCP,8080/TCP,9103/TCP,9160/TCP 33s test-dep-dc-test-stargate-service ClusterIP 10.96.125.32 <none> 8080/TCP,8081/TCP,8082/TCP,8084/TCP,8085/TCP,9042/TCP 35s test-dep-grafana ClusterIP 10.106.69.131 <none> 80/TCP 35s test-dep-kube-prometheus-s-operator ClusterIP 10.100.170.208 <none> 443/TCP 35s test-dep-kube-prometheus-s-prometheus ClusterIP 10.109.19.63 <none> 9090/TCP 35s test-dep-seed-service ClusterIP None <none> <none> 32s
Enter fullscreen mode Exit fullscreen mode

You can port-forward these services as per your requirement

Example: kubectl port-foward svc/test-dep-grafana 80

You can use the kube-forwarder tool to port-forward the services in your local machines

Top comments (0)