How to use the K8ssandra operator
Abhijith Ganesh
Posted on February 3, 2022
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.yamlAdd 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/
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
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
** 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
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
Posted on February 3, 2022
Join Our Newsletter. No Spam, Only the good stuff.
Sign up to receive the latest update from our blog.
Related