Example: Deploying Cassandra with Stateful Sets

This tutorial shows you how to develop a native cloud Cassandra deployment on Kubernetes. In this example, a custom Cassandra SeedProvider enables Cassandra to discover new Cassandra nodes as they join the cluster.

StatefulSets make it easier to deploy stateful applications within a clustered environment. For more information on the features used in this tutorial, see the StatefulSet documentation.

Cassandra on Docker

The Pods in this tutorial use the gcr.io/google-samples/cassandra:v13 image from Google’s container registry. The Docker image above is based on debian-base and includes OpenJDK 8.

This image includes a standard Cassandra installation from the Apache Debian repo. By using environment variables you can change values that are inserted into cassandra.yaml.

ENV VAR	DEFAULT VALUE
`CASSANDRA_CLUSTER_NAME`	`'Test Cluster'`
`CASSANDRA_NUM_TOKENS`	`32`
`CASSANDRA_RPC_ADDRESS`	`0.0.0.0`

Objectives
Before you begin
Creating a Cassandra Headless Service
Using a StatefulSet to Create a Cassandra Ring
Validating The Cassandra StatefulSet
Modifying the Cassandra StatefulSet
Cleaning up
What's next

Objectives

Create and validate a Cassandra headless Service.
Use a StatefulSet to create a Cassandra ring.
Validate the StatefulSet.
Modify the StatefulSet.
Delete the StatefulSet and its Pods.

Before you begin

To complete this tutorial, you should already have a basic familiarity with Pods, Services, and StatefulSets. In addition, you should:

Install and Configure the kubectl command-line tool
Download cassandra-service.yaml and cassandra-statefulset.yaml
Have a supported Kubernetes cluster running

Note: Please read the setup if you do not already have a cluster.

Additional Minikube Setup Instructions

Caution:
Minikube defaults to 1024MB of memory and 1 CPU. Running Minikube with the default resource configuration results in insufficient resource errors during this tutorial. To avoid these errors, start Minikube with the following settings:
minikube start --memory 5120 --cpus=4

Creating a Cassandra Headless Service

A Kubernetes Service describes a set of Pods that perform the same task.

The following Service is used for DNS lookups between Cassandra Pods and clients within the Kubernetes cluster.

`application/cassandra/cassandra-service.yaml`
`apiVersion: v1 kind: Service metadata: labels: app: cassandra name: cassandra spec: clusterIP: None ports: - port: 9042 selector: app: cassandra`

Launch a terminal window in the directory you downloaded the manifest files.
Create a Service to track all Cassandra StatefulSet nodes from the cassandra-service.yaml file:
```
kubectl apply -f https://k8s.io/examples/application/cassandra/cassandra-service.yaml
```

Validating (optional)

Get the Cassandra Service.

kubectl get svc cassandra

The response is

NAME        TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)    AGE
cassandra   ClusterIP   None         <none>        9042/TCP   45s

Service creation failed if anything else is returned. Read Debug Services for common issues.

Using a StatefulSet to Create a Cassandra Ring

The StatefulSet manifest, included below, creates a Cassandra ring that consists of three Pods.

Note: This example uses the default provisioner for Minikube. Please update the following StatefulSet for the cloud you are working with.

`application/cassandra/cassandra-statefulset.yaml`
apiVersion: apps/v1 kind: StatefulSet metadata: name: cassandra labels: app: cassandra spec: serviceName: cassandra replicas: 3 selector: matchLabels: app: cassandra template: metadata: labels: app: cassandra spec: terminationGracePeriodSeconds: 1800 containers: - name: cassandra image: gcr.io/google-samples/cassandra:v13 imagePullPolicy: Always ports: - containerPort: 7000 name: intra-node - containerPort: 7001 name: tls-intra-node - containerPort: 7199 name: jmx - containerPort: 9042 name: cql resources: limits: cpu: "500m" memory: 1Gi requests: cpu: "500m" memory: 1Gi securityContext: capabilities: add: - IPC_LOCK lifecycle: preStop: exec: command: - /bin/sh - -c - nodetool drain env: - name: MAX_HEAP_SIZE value: 512M - name: HEAP_NEWSIZE value: 100M - name: CASSANDRA_SEEDS value: "cassandra-0.cassandra.default.svc.cluster.local" - name: CASSANDRA_CLUSTER_NAME value: "K8Demo" - name: CASSANDRA_DC value: "DC1-K8Demo" - name: CASSANDRA_RACK value: "Rack1-K8Demo" - name: POD_IP valueFrom: fieldRef: fieldPath: status.podIP readinessProbe: exec: command: - /bin/bash - -c - /ready-probe.sh initialDelaySeconds: 15 timeoutSeconds: 5 # These volume mounts are persistent. They are like inline claims, # but not exactly because the names need to match exactly one of # the stateful pod volumes. volumeMounts: - name: cassandra-data mountPath: /cassandra_data # These are converted to volume claims by the controller # and mounted at the paths mentioned above. # do not use these in production until ssd GCEPersistentDisk or other ssd pd volumeClaimTemplates: - metadata: name: cassandra-data spec: accessModes: [ "ReadWriteOnce" ] storageClassName: fast resources: requests: storage: 1Gi --- kind: StorageClass apiVersion: storage.k8s.io/v1 metadata: name: fast provisioner: k8s.io/minikube-hostpath parameters: type: pd-ssd

application/cassandra/cassandra-statefulset.yaml Copy application/cassandra/cassandra-statefulset.yaml to clipboard

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: cassandra
  labels:
    app: cassandra
spec:
  serviceName: cassandra
  replicas: 3
  selector:
    matchLabels:
      app: cassandra
  template:
    metadata:
      labels:
        app: cassandra
    spec:
      terminationGracePeriodSeconds: 1800
      containers:
      - name: cassandra
        image: gcr.io/google-samples/cassandra:v13
        imagePullPolicy: Always
        ports:
        - containerPort: 7000
          name: intra-node
        - containerPort: 7001
          name: tls-intra-node
        - containerPort: 7199
          name: jmx
        - containerPort: 9042
          name: cql
        resources:
          limits:
            cpu: "500m"
            memory: 1Gi
          requests:
            cpu: "500m"
            memory: 1Gi
        securityContext:
          capabilities:
            add:
              - IPC_LOCK
        lifecycle:
          preStop:
            exec:
              command: 
              - /bin/sh
              - -c
              - nodetool drain
        env:
          - name: MAX_HEAP_SIZE
            value: 512M
          - name: HEAP_NEWSIZE
            value: 100M
          - name: CASSANDRA_SEEDS
            value: "cassandra-0.cassandra.default.svc.cluster.local"
          - name: CASSANDRA_CLUSTER_NAME
            value: "K8Demo"
          - name: CASSANDRA_DC
            value: "DC1-K8Demo"
          - name: CASSANDRA_RACK
            value: "Rack1-K8Demo"
          - name: POD_IP
            valueFrom:
              fieldRef:
                fieldPath: status.podIP
        readinessProbe:
          exec:
            command:
            - /bin/bash
            - -c
            - /ready-probe.sh
          initialDelaySeconds: 15
          timeoutSeconds: 5
        # These volume mounts are persistent. They are like inline claims,
        # but not exactly because the names need to match exactly one of
        # the stateful pod volumes.
        volumeMounts:
        - name: cassandra-data
          mountPath: /cassandra_data
  # These are converted to volume claims by the controller
  # and mounted at the paths mentioned above.
  # do not use these in production until ssd GCEPersistentDisk or other ssd pd
  volumeClaimTemplates:
  - metadata:
      name: cassandra-data
    spec:
      accessModes: [ "ReadWriteOnce" ]
      storageClassName: fast
      resources:
        requests:
          storage: 1Gi
---
kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: fast
provisioner: k8s.io/minikube-hostpath
parameters:
  type: pd-ssd

Update the StatefulSet if necessary.

Create the Cassandra StatefulSet from the cassandra-statefulset.yaml file:

kubectl apply -f https://k8s.io/examples/application/cassandra/cassandra-statefulset.yaml

Validating The Cassandra StatefulSet

Get the Cassandra StatefulSet:

kubectl get statefulset cassandra

The response should be:

NAME        DESIRED   CURRENT   AGE
cassandra   3         0         13s

The StatefulSet resource deploys Pods sequentially.

Get the Pods to see the ordered creation status:

kubectl get pods -l="app=cassandra"

The response should be:

NAME          READY     STATUS              RESTARTS   AGE
cassandra-0   1/1       Running             0          1m
cassandra-1   0/1       ContainerCreating   0          8s

It can take several minutes for all three Pods to deploy. Once they are deployed, the same command returns:

NAME          READY     STATUS    RESTARTS   AGE
cassandra-0   1/1       Running   0          10m
cassandra-1   1/1       Running   0          9m
cassandra-2   1/1       Running   0          8m

Run the Cassandra nodetool to display the status of the ring.

kubectl exec -it cassandra-0 -- nodetool status

The response should look something like this:

Datacenter: DC1-K8Demo
======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address     Load       Tokens       Owns (effective)  Host ID                               Rack
UN  172.17.0.5  83.57 KiB  32           74.0%             e2dd09e6-d9d3-477e-96c5-45094c08db0f  Rack1-K8Demo
UN  172.17.0.4  101.04 KiB  32           58.8%             f89d6835-3a42-4419-92b3-0e62cae1479c  Rack1-K8Demo
UN  172.17.0.6  84.74 KiB  32           67.1%             a6a1e8c2-3dc5-4417-b1a0-26507af2aaad  Rack1-K8Demo

Modifying the Cassandra StatefulSet

Use kubectl edit to modify the size of a Cassandra StatefulSet.

Run the following command:

kubectl edit statefulset cassandra

This command opens an editor in your terminal. The line you need to change is the replicas field. The following sample is an excerpt of the StatefulSet file:

# Please edit the object below. Lines beginning with a '#' will be ignored,
# and an empty file will abort the edit. If an error occurs while saving this file will be
# reopened with the relevant failures.
#
apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
kind: StatefulSet
metadata:
  creationTimestamp: 2016-08-13T18:40:58Z
  generation: 1
  labels:
  app: cassandra
  name: cassandra
  namespace: default
  resourceVersion: "323"
  uid: 7a219483-6185-11e6-a910-42010a8a0fc0
spec:
  replicas: 3

Change the number of replicas to 4, and then save the manifest.

The StatefulSet now contains 4 Pods.

Get the Cassandra StatefulSet to verify:

kubectl get statefulset cassandra

The response should be

NAME        DESIRED   CURRENT   AGE
cassandra   4         4         36m

Cleaning up

Deleting or scaling a StatefulSet down does not delete the volumes associated with the StatefulSet. This setting is for your safety because your data is more valuable than automatically purging all related StatefulSet resources.

Warning: Depending on the storage class and reclaim policy, deleting the PersistentVolumeClaims may cause the associated volumes to also be deleted. Never assume you’ll be able to access data if its volume claims are deleted.

Run the following commands (chained together into a single command) to delete everything in the Cassandra StatefulSet:

grace=$(kubectl get po cassandra-0 -o=jsonpath='{.spec.terminationGracePeriodSeconds}') \
  && kubectl delete statefulset -l app=cassandra \
  && echo "Sleeping $grace" \
  && sleep $grace \
  && kubectl delete pvc -l app=cassandra

Run the following command to delete the Cassandra Service.
```
kubectl delete service -l app=cassandra
```

What's next

Learn how to Scale a StatefulSet.
Learn more about the KubernetesSeedProvider
See more custom Seed Provider Configurations

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