To allow existing users of ACK Serverless Basic clusters to use the features and capabilities of ACK Serverless Pro clusters, Container Service for Kubernetes (ACK) has launched a hot migration feature that helps you dynamically migrate an ACK Serverless Basic cluster to an ACK Serverless Pro cluster. This topic describes how to migrate an ACK Serverless Basic cluster to an ACK Serverless Pro cluster.
Background information
An ACK Serverless Pro cluster is an ACK Serverless cluster that is built on the ACK Serverless Basic cluster, provides enhanced reliability and security for large-scale enterprise production environments, and offers a compensable Service Level Agreement (SLA). For more information, see the ACK Serverless Pro cluster overview.
Limitations
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You can only hot migrate an ACK Serverless Basic cluster to an ACK Serverless Pro cluster if the cluster runs Kubernetes 1.16 or later.
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You cannot downgrade an ACK Serverless Pro cluster to an ACK Serverless Basic cluster.
Workflow
The migration from an ACK Serverless Basic cluster to an ACK Serverless Pro cluster consists of two parts: a precheck and the migration.
You can migrate an ACK Serverless Basic cluster to an ACK Serverless Pro cluster only after the cluster passes the precheck.
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If the precheck fails, view the report details and follow the instructions to fix the issues.
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If the precheck passes, you can start the migration.
Migration impact
Hot migrating an ACK Serverless Basic cluster to an ACK Serverless Pro cluster does not affect your workloads. However, we recommend that you perform the migration during off-peak hours.
Procedure
Log on to the ACK console. In the left navigation pane, click Clusters.
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On the Clusters page, find the ACK Serverless Basic cluster to migrate and click Migrate to Pro in the Actions column.
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In the Migrate to Pro dialog box, click Precheck. Review the notes in the dialog box, which state that the migration changes your billing, the APIServer will be briefly unavailable, and cluster events will be cleared. The notes also remind you that the cluster must pass this precheck, the process takes about 5 minutes, and it is best performed during off-peak hours.
After you click Precheck, you are taken to the Migration Check page in the Container Intelligence Service console.
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On the Migration Check page, click Run Migration Check. In the Migration Check panel, read and select Notes, then click Check.
If the check fails, click View Details on the Migration Check page and follow the instructions to resolve the issues.
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After the check passes, return to the Migrate to Pro dialog box and click OK.
After the migration, the Cluster Type of the ACK Serverless Basic cluster automatically changes from ACK Serverless Basic cluster to ACK Serverless Pro cluster.