Cloudera Docs

Rotating database certificates when SSL enforcement is enabled

When SSL enforcement is enabled on your database server, do not perform the RDS certificate rotation directly using AWS tools, as this can lead to a service degradation or an outage of the respective resource. Use the options provided by CDP Public Cloud to perform the required RDS certificate rotation instead.

Required role (Data Lakes): EnvironmentAdmin

Required role (Data Hub): DataHubAdmin or EnvironmentAdmin

If the following warning message is displayed on top of the Management Console window, you must perform the TLS/SSL certificate rotation:

If you do not see the warning message, your clusters are not affected or the rotation has already been performed when you recently stopped and started your cluster or the environment.

CDP provides two options for rotating the expiring database certificates, with and without stopping your cluster:

Rotating the database certificate by stopping and starting your cluster

This is the default and most simple way to let CDP perform the certificate rotation and all changes required.

Instructions

  1. Stop all Data Hubs where the warning about expiring database certificates is shown.

  2. Stop and start your Data Lakes where the warning message is displayed.

    CDP will automatically perform all Data Lake and AWS RDS changes required.

  3. Start all Data Hubs that you have previously stopped.

    CDP will automatically perform all Data Hub and AWS RDS changes required where the warning message is displayed.

You can perform the stop and start either via UI or CLI, see Stop a cluster.

Rotating the database certificate without stopping the cluster

Stopping the Data Lake or Data Hubs is not feasible in some scenarios, as workloads need to be stopped and data stored on ephemeral disks or ephemeral cache is lost during cluster restart.

In certain cases, CDP allows the database certificate rotation to be performed without stopping your cluster. If your cluster supports this, you will see a Rotate Database Certificate button in the warning message.

The Rotate Database Certificate button is only available if a rolling restart is supported on your cluster. The list of supported Data Lakes and Data Hubs is available in the Rolling upgrades overview.

Under some circumstances, a rolling certificate rotation may not be supported for a Data Lake or Data Hub cluster, but can be enabled through entitlement. For information about obtaining this entitlement, contact Cloudera Customer Support.

Instructions

To perform a rolling restart, click the Rotate Database Certificate button on top of the screen, inside the warning message.

You can also use the following CLI commands to perform the certificate rotation with minimal downtime and without stopping the cluster. The same roles are required as for the Rotate Database Certificate action through the UI.

  1. Use the following command to rotate the certificate for each Data Hub cluster.
    cdp datahub rotate-db-certificate --datahubName <VALUE CAN BE cluster CRN or name>
  2. Use the following command to rotate the certificate for the Data Lake.
    cdp datalake rotate-db-certificate --datalakeName <VALUE CAN BE cluster CRN or name>

Overriding default root certificate

CDP automatically chooses the target root certificate for the RDS instance. Currently, the following certificate authority (CA) certificates are available for the RDS database:
  • rds-ca-rsa2048-g1, which is valid for 40 years
  • rds-ca-rsa4096-g1, which is valid for 100 years
  • rds-ca-ecc384-g1, which is valid for 100 years
By default, rds-ca-rsa2048-g1 is the root certificate in all supported regions that is picked as a target certificate during the certificate rotation. You have the option to override the default certificate, and set one of the certificates available in your region as a target root certificate that will be picked during the certificate rotation. Overriding the default root certificate is not tied to any particular RDS instance, but applicable to the whole AWS region in the target AWS account.
The list of available root certificates in your region can be retrieved with the following AWS CLI command:
aws --region [*** REGION ***] rds describe-certificates
The command returns the output JSON containing the properties of the RDS root certificates that are currently available in the given region. The properties also detail if an override is already set for the root certificate.
If there are more than one entries, you can use the following command to set one of the root certificates as a target, and override what is configured as default:
aws --region [*** REGION ***] rds modify-certificates --certificate-identifier [*** ROOT CERTIFICATE ***]
The following command is an example to override the default rds-ca-rsa2048-g1 certificaate in the us-west-1 to rds-ca-ecc384-g1:
aws --region us-west-1 rds modify-certificates --certificate-identifier rds-ca-ecc384-g1