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MongoDB Vertical Scaling

This guide will give an overview on how KubeDB Ops-manager operator updates the resources(for example CPU and Memory etc.) of the MongoDB database.

Before You Begin

You should be familiar with the following KubeDB concepts:
- MongoDB
- MongoDBOpsRequest

How Vertical Scaling Process Works

The following diagram shows how KubeDB Ops-manager operator updates the resources of the MongoDB database. Open the image in a new tab to see the enlarged version.

Fig: Vertical scaling process of MongoDB

The vertical scaling process consists of the following steps:

At first, a user creates a MongoDB Custom Resource (CR).
KubeDB Provisioner operator watches the MongoDB CR.
When the operator finds a MongoDB CR, it creates required number of StatefulSets and related necessary stuff like secrets, services, etc.
Then, in order to update the resources(for example CPU, Memory etc.) of the MongoDB database the user creates a MongoDBOpsRequest CR with desired information.
KubeDB Ops-manager operator watches the MongoDBOpsRequest CR.
When it finds a MongoDBOpsRequest CR, it halts the MongoDB object which is referred from the MongoDBOpsRequest. So, the KubeDB Provisioner operator doesn’t perform any operations on the MongoDB object during the vertical scaling process.
Then the KubeDB Ops-manager operator will update resources of the StatefulSet Pods to reach desired state.
After the successful update of the resources of the StatefulSet’s replica, the KubeDB Ops-manager operator updates the MongoDB object to reflect the updated state.
After the successful update of the MongoDB resources, the KubeDB Ops-manager operator resumes the MongoDB object so that the KubeDB Provisioner operator resumes its usual operations.

In the next docs, we are going to show a step by step guide on updating resources of MongoDB database using MongoDBOpsRequest CRD.

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MongoDB Vertical Scaling

Before You Begin

How Vertical Scaling Process Works

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