In ACK dedicated clusters, master nodes require manual administration. As your cluster scales or workload patterns change, these nodes may experience resource constraints or idle capacity. This topic describes how to change the instance type of a master node to adjust its resource specifications.
Prerequisites
Before you begin, ensure that you have:
Usage notes
This operation may involve unexpected risks. Back up your data before proceeding.
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This procedure applies to pay-as-you-go master nodes. For other billing methods or alternative scaling approaches, see Overview of instance configuration changes.
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Resource scaling requires a node reboot.
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Schedule these operations during off-peak hours to minimize business impact.
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To modify the configurations of multiple master nodes, operate node-by-node to maintain cluster availability. Parallel modifications may trigger API server disruptions.
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OS replacement is not supported on master nodes.
Change the instance type of a master node
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Log on to the ACK console. In the left-side navigation pane, click Clusters.
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On the Clusters page, click the name of the target cluster. In the left-side navigation pane, choose Nodes > Nodes.
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Locate the master node whose instance type you want to change. Click its instance ID to open the Instance Details tab, where you can view current instance specifications.
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In the Configuration Information section, click Change to the right of the instance type field. The Change Instance Type dialog box appears.
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Select the target instance type, confirm the estimated cost, and click Stop Instances and Proceed. For recommended master node specifications based on cluster size, see Choose ECS specifications to create master nodes.
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In the Stop Instance dialog box, set the Stopped By parameter and click Confirm. For details, see Stop an instance.
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After the configuration change completes, click Start Instance And Return. In the Start Instance dialog box, click OK. Wait until the node is re-added to the cluster and enters the Ready state.