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MySQLRole

What is MySQLRole

A MySQLRole is a Kubernetes CustomResourceDefinition (CRD) which allows a user to create a database secret engine role in a Kubernetes native way.

When a MySQLRole is created, the KubeVault operator creates a role according to the specification. If the user deletes the MySQLRole CRD, then the respective role will also be deleted from Vault.

MySQLRole CRD Specification

Like any official Kubernetes resource, a MySQLRole object has TypeMeta, ObjectMeta, Spec and Status sections.

A sample MySQLRole object is shown below:

apiVersion: engine.kubevault.com/v1alpha1
kind: MySQLRole
metadata:
  name: mysql-role
  namespace: demo
spec:
  secretEngineRef:
    name: sql-secret-engine
  creationStatements:
    - "CREATE USER '{{name}}'@'%' IDENTIFIED BY '{{password}}';"
    - "GRANT SELECT ON *.* TO '{{name}}'@'%';"
status:
  observedGeneration: 1
  phase: Success

Note: To resolve the naming conflict, name of the role in Vault will follow this format: k8s.{clusterName}.{metadata.namespace}.{metadata.name}

Here, we are going to describe the various sections of the MySQLRole crd.

MySQLRole Spec

MySQLRole spec contains information that necessary for creating a database role.

spec:
  secretEngineRef:
    name: <secret-engine-name>
  path: <database-secret-engine-path>
  defaultTTL: <default-ttl>
  maxTTL: <max-ttl>
  creationStatements:
    - "statement-0"
    - "statement-1"
  revocationStatements:
    - "statement-0"

MySQLRole spec has the following fields:

spec.secretEngineRef

spec.secretEngineRef is a required field that specifies the name of an AppBinding reference which is used to connect with a Vault server. AppBinding must be on the same namespace with the MySQLRole object.

spec:
  secretEngineRef:
    name: sql-secret-engine

spec.path

spec.path is an optional field that specifies the path where the secret engine is enabled. The default value is database.

spec:
  path: my-mysql-path

spec.creationStatements

spec.creationStatements is a required field that specifies a list of database statements executed to create and configure a user. The {{name}} and {{password}} values will be substituted by Vault.

spec:
  creationStatements:
    - "CREATE USER '{{name}}'@'%' IDENTIFIED BY '{{password}}';"
    - "GRANT SELECT ON *.* TO '{{name}}'@'%';"

spec.defaultTTL

spec.defaultTTL is an optional field that specifies the TTL for the leases associated with this role. Accepts time suffixed strings (“1h”) or an integer number of seconds. Defaults to system/engine default TTL time.

spec:
  defaultTTL: "1h"

spec.maxTTL

spec.maxTTL is an optional field that specifies the maximum TTL for the leases associated with this role. Accepts time suffixed strings (“1h”) or an integer number of seconds. Defaults to system/engine default TTL time.

spec:
  maxTTL: "1h"

spec.revocationStatements

spec.revocationStatements is an optional field that specifies a list of database statements to be executed to revoke a user. The {{name}} value will be substituted. If not provided defaults to a generic drop user statement.

MySQLRole Status

status shows the status of the MySQLRole. It is managed by the KubeVault operator. It contains the following fields:

• observedGeneration: Specifies the most recent generation observed for this resource. It corresponds to the resource’s generation, which is updated on mutation by the API Server.

• phase: Indicates whether the role successfully applied to Vault or not.

• conditions : Represent observations of a MySQLRole.