{"id":5484,"date":"2020-05-11T08:00:14","date_gmt":"2020-05-11T02:30:14","guid":{"rendered":"https:\/\/www.upnxtblog.com\/?p=5484"},"modified":"2020-07-06T12:05:52","modified_gmt":"2020-07-06T06:35:52","slug":"portworx-tutorial-demonstrate-ha-cassandra-stateful-application","status":"publish","type":"post","link":"https:\/\/www.upnxtblog.com\/index.php\/2020\/05\/11\/portworx-tutorial-demonstrate-ha-cassandra-stateful-application\/","title":{"rendered":"Portworx Tutorial : Demonstrate HA Cassandra Stateful Application"},"content":{"rendered":"
<\/div>

Portworx <\/a><\/strong>is a popular Kubernetes persistent storage<\/a>\u00a0and\u00a0Docker storage<\/a> solution. It’s a clustered block storage solution and provides a Cloud-Native layer from which containerized stateful applications programmatically consume block, file, and object storage services directly through the scheduler.<\/p>\n

With Portworx, you can manage any database or stateful service on any infrastructure using any container scheduler. You get a single data management layer for all of your stateful services, no matter where they run.<\/p>\n

In this post, we will learn how to deploy Cassandra to Kubernetes and use Portworx Volumes to provide HA capability:<\/p>\n

    \n
  1. Install, configure Portworx<\/strong><\/li>\n
  2. Use the Portworx Storage Class<\/strong> to create a PVC with 3 replicas of the data<\/li>\n
  3. Use a simple YAML file to deploy Cassandra<\/strong> using this storage class<\/li>\n
  4. How to validate data persistence by deleting the Cassandra pod<\/li>\n<\/ol>\n

    First, we will deploy Cassandra in a StatefulSet with a single node (replicas=1) to show the basics of node failover. We will create sample data, force Cassandra to flush the data to disk, and then failover the Cassandra pod and show how it comes back up with its data intact. Then, we’re going to show how we can scale the cluster to 3 nodes and dynamically create volumes for each.<\/p>\n\n

    Step #1.Validate Kubernetes<\/h2>\n

    Use kubectl get nodes<\/code> to check if the Kubernetes nodes are ready.<\/p>\n

    \"\"
    Image – Kubernetes Pods are ready<\/figcaption><\/figure>\n

    Step #2.Install Portworx<\/h2>\n

    Portworx requires at least 2 to 3 nodes in the cluster to have dedicated storage for use. It will then carve out virtual volumes from these storage pools. In this example, we use a 20GB block device that exists on each node.<\/p>\n

    \"\"
    Image – Choose the device to install portworx<\/figcaption><\/figure>\n
    \"\"
    Image – Install Portworx<\/figcaption><\/figure>\n

    In the above install command, note the below:<\/p>\n