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MySQL Volume Expansion
This guide will give an overview on how KubeDB Ops Manager expand the volume of MySQL
.
Before You Begin
- You should be familiar with the following
KubeDB
concepts:
How Volume Expansion Process Works
The following diagram shows how KubeDB Ops Manager expand the volumes of MySQL
database components. Open the image in a new tab to see the enlarged version.
![Volume Expansion process of MySQL](/docs/v2024.4.27/guides/mysql/volume-expansion/overview/images/volume-expansion.jpg)
The Volume Expansion process consists of the following steps:
At first, a user creates a
MySQL
Custom Resource (CR).KubeDB
Community operator watches theMySQL
CR.When the operator finds a
MySQL
CR, it creates requiredStatefulSet
and related necessary stuff like secrets, services, etc.The statefulSet creates Persistent Volumes according to the Volume Claim Template provided in the statefulset configuration. This Persistent Volume will be expanded by the
KubeDB
Enterprise operator.Then, in order to expand the volume of the
MySQL
database the user creates aMySQLOpsRequest
CR with desired information.KubeDB
Enterprise operator watches theMySQLOpsRequest
CR.When it finds a
MySQLOpsRequest
CR, it pauses theMySQL
object which is referred from theMySQLOpsRequest
. So, theKubeDB
Community operator doesn’t perform any operations on theMySQL
object during the volume expansion process.Then the
KubeDB
Enterprise operator will expand the persistent volume to reach the expected size defined in theMySQLOpsRequest
CR.After the successfully expansion of the volume of the related StatefulSet Pods, the
KubeDB
Enterprise operator updates the new volume size in theMySQL
object to reflect the updated state.After the successful Volume Expansion of the
MySQL
, theKubeDB
Enterprise operator resumes theMySQL
object so that theKubeDB
Community operator resumes its usual operations.
In the next docs, we are going to show a step by step guide on Volume Expansion of various MySQL database using MySQLOpsRequest
CRD.