To improve the security and stability of your ECS instances, you need to upgrade a group of instances that run outdated operating systems. These versions no longer receive maintenance or support and carry significant security risks, so migrate to a newer operating system that receives ongoing maintenance. This topic describes how to use OOS to efficiently upgrade ECS instances in bulk.
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Instances restart during template execution.
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You cannot switch between Windows and Linux operating systems.
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Target ECS instances must not have unpaid orders.
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Data on the system disk is cleared. Only data on data disks is retained.
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Selecting a paid image incurs an image fee. For more information, see Image billing.
Procedure
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Log on to the CloudOps Orchestration Service console. In the left-side navigation pane, choose . Select the Batch Instance Operations task and click Create.
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Click Instance Operations, click Replace System Disk, and then select a target image.
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Select the ECS instances to upgrade.
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Keep the default advanced options and click Create.
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In Execution Steps and Results, view the execution progress.
