Cassandra Operator workshop

Requirements

• Kubernetes 1.8+

Minikube

• Install

# start
$ minikube start --cpus 4 --memory 4096 --vm-driver hyperkit --kubernetes-version v1.9.4

Deploy Cassandra Operator

Create a deployment for Cassandra Operator

$ make deploy-operator

Verify the Service was created and a port was allocated:

$ kubectl get services
NAME              TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)          AGE
cassandra         ClusterIP   None           <none>        9042/TCP         1m
cassandra-seeds   ClusterIP   None           <none>        7000/TCP         1m

$ kubectl get pods
NAME                                  READY     STATUS    RESTARTS   AGE
cassandra-operator-847947679f-sk88d   1/1       Running   0          1m

Provision Cassandra Cluster

Create a deployment for Cassandra Cluster

$ make provision-cassandra

Example:

apiVersion: stable.instaclustr.com/v1
kind: CassandraDataCentre
metadata:
  name: cassandra
spec:
  serviceName: cassandra
  replicas: 1
  image: gcr.io/cassandra-operator/cassandra:latest

Verify the Pod was created:

$ kubectl get pods
NAME                                  READY     STATUS    RESTARTS   AGE
cassandra-0                           1/1       Running   0          1m

Tearing down your Operator deployment

$ make clean-operator

Cassandra initial setup

Launch cqlsh and execute:

$ kubectl exec cassandra-0 -i -t -- bash -c 'cqlsh cassandra-seeds'
$ CREATE KEYSPACE accountsapi WITH replication = {'class': 'SimpleStrategy', 'replication_factor' : 1};
$ use accountsapi; CREATE TABLE accounts (id UUID,name text,age int,email text,city text,PRIMARY KEY (id));

Go client app

Build

$ make docker-app-build

Deploy to mini-kube

$ make minikube-deploy

Verify the Service was created and a node port was allocated:

$ kubectl get service web
NAME      TYPE       CLUSTER-IP     EXTERNAL-IP   PORT(S)          AGE
web       NodePort   10.108.82.46   <none>        8080:32491/TCP   1h

To run locally, get public API endpoint

$ minikube service web --url
http://192.168.64.6:32491

Create Account

curl -X POST \
  http://192.168.64.6:31132/account \
  -H 'Cache-Control: no-cache' \
  -H 'Content-Type: application/json' \
  -H 'Postman-Token: 6b7e71fe-8efe-402b-a96e-8f5763da34e3' \
  -d '{
	"name" : "abc inc",
	"email":"abc@gmail.com",
	"age": 21,
	"city":"chicago"
}'

Get Account

curl -X GET \
  http://192.168.64.6:31132/accounts \
  -H 'Cache-Control: no-cache' \
  -H 'Content-Type: application/json' \
  -H 'Postman-Token: 510a7008-94e4-4570-b367-3e2e14749976' \