New to KubeDB? Please start here.

Before You Begin

• You should be familiar with the following KubeDB concepts:
  • MySQL
  • MySQLDatabase

What is Schema Manager

Schema Manager is a Kubernetes operator developed by AppsCode that implements multi-tenancy inside KubeDB provisioned database servers like MySQL, MariaDB, PosgreSQL and MongoDB etc. With Schema Manager one can create database into specific database server. An user will also be created with KubeVault and assigned to that database. Using the newly created user credential one can access the database and run operations into it. One may pass the database server reference, configuration, user access policy through a single yaml and Schema Manager will do all the task above mentioned. Schema Manager also allows initializing the database and restore snapshot while bootstrap.

How MySQL Schema Manager Process Works

The following diagram shows how MySQL Schema Manager process worked. Open the image in a new tab to see the enlarged version.

The process consists of the following steps:

1. At first the user will deploy a MySQLDatabase object.

2. Once a MySQLDatabase object is deployed to the cluster, the Schema Manager operator first verifies the object by checking the Double-OptIn.

3. After the Double-OptIn verification Schema Manager operator checks in the MySQL server if the target database is already present or not. If the database already present there, then the MySQLDatabase object will be immediately denied.

4. Once everything is ok in the MySQL server side, then the target database will be created and an entry for that will be entered in the kubedb_system database.

5. After successful database creation, the Vault server creates a user in the MySQL server. The user gets all the privileges on our target database and its credentials are served with a secret.

6. The user credentials secret reference is patched with the MySQLDatabase object yaml in the .status.authSecret.name field.

7. If there is any init script associated with the MySQLDatabase object, it will be executed in this step with the Schema Manager operator.

8. The user can also provide a snapshot reference for initialization. In that case Schema Manager operator fetches necessary appbinding, secrets, repository and then the Stash operator takes action with all the information.

In the next doc, we are going to show a step by step guide of using MySQL Schema Manager with KubeDB.