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zacharysarah
2017-11-30 18:53:33 -06:00
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docs/tutorials/stateful-application/cassandra.md
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@@ -1,6 +1,6 @@
---
title: "Example: Deploying Cassandra with Stateful Sets"
assignees:
approvers:
- ahmetb
---
@@ -45,18 +45,18 @@ To complete this tutorial, you should already have a basic familiarity with [Pod
### Additional Minikube Setup Instructions
**Caution:** [Minikube](/docs/getting-started-guides/minikube/) defaults to 1024MB of memory and 1 CPU which results in an insufficient resource errors during this tutorial.
**Caution:** [Minikube](/docs/getting-started-guides/minikube/) defaults to 1024MB of memory and 1 CPU which results in an insufficient resource errors during this tutorial.
{: .caution}
To avoid these errors, run minikube with:
minikube start --memory 5120 --cpus=4
{% endcapture %}
{% capture lessoncontent %}
## Creating a Cassandra Headless Service
A Kubernetes [Service](/docs/concepts/services-networking/service/) describes a set of [Pods](/docs/concepts/workloads/pods/pod/) that perform the same task.
A Kubernetes [Service](/docs/concepts/services-networking/service/) describes a set of [Pods](/docs/concepts/workloads/pods/pod/) that perform the same task.
The following `Service` is used for DNS lookups between Cassandra Pods and clients within the Kubernetes Cluster.
@@ -110,14 +110,14 @@ The StatefulSet manifest, included below, creates a Cassandra ring that consists
2. 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
**Note:** It can take up to ten minutes for all three Pods to deploy.
**Note:** It can take up to ten minutes for all three Pods to deploy.
{: .note}
Once all Pods are deployed, the same command returns:
@@ -143,39 +143,37 @@ The StatefulSet manifest, included below, creates a Cassandra ring that consists
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 of a Cassandra StatefulSet.
Use `kubectl edit` to modify the size of of a Cassandra StatefulSet.
1. 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.
**Note:** The following sample is an excerpt of the StatefulSet file.
{: .note}
```yaml
# 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/v1beta2
kind: StatefulSet
metadata:
creationTimestamp: 2016-08-13T18:40:58Z
generation: 1
labels:
app: cassandra
name: cassandra
namespace: default
resourceVersion: "323"
selfLink: /apis/apps/v1beta1/namespaces/default/statefulsets/cassandra
uid: 7a219483-6185-11e6-a910-42010a8a0fc0
spec:
replicas: 3
```
# 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/v1beta2
kind: StatefulSet
metadata:
creationTimestamp: 2016-08-13T18:40:58Z
generation: 1
labels:
app: cassandra
name: cassandra
namespace: default
resourceVersion: "323"
selfLink: /apis/apps/v1beta1/namespaces/default/statefulsets/cassandra
uid: 7a219483-6185-11e6-a910-42010a8a0fc0
spec:
replicas: 3
2. Change the number of replicas to 4, and then save the manifest.
2. Change the number of replicas to 4, and then save the manifest.
The StatefulSet now contains 4 Pods.
@@ -187,11 +185,11 @@ Use `kubectl edit` to modify the size of of a Cassandra StatefulSet.
NAME DESIRED CURRENT AGE
cassandra 4 4 36m
{% endcapture %}
{% capture cleanup %}
Deleting or scaling a StatefulSet down does not delete the volumes associated with the StatefulSet. This ensures safety first: your data is more valuable than an auto purge of all related StatefulSet resources.
Deleting or scaling a StatefulSet down does not delete the volumes associated with the StatefulSet. This ensures safety first: your data is more valuable than an auto purge of all related StatefulSet resources.
**Warning:** Depending on the storage class and reclaim policy, deleting the Persistent Volume Claims may cause the associated volumes to also be deleted. Never assume you’ll be able to access data if its volume claims are deleted.
{: .warning}