[Component upgrade] NPD upgrade announcement
Upgrade the ACK Node Problem Detector (ack-node-problem-detector) add-on to version 1.2.8 or later to improve cluster stability.
Background information
Versions of the ack-node-problem-detector add-on earlier than version 1.2.8 enable the file system (FS) handle check (check_fd) by default. When the check_fd process reads large amounts of kernel data, it can trigger a defect in certain operating system kernel versions. This may cause zombie processes to accumulate or even lead to system downtime.
Upgrade the add-on
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To avoid issues that earlier add-on versions may cause, upgrade the ack-node-problem-detector add-on to version 1.2.8 or later on clusters whose kernel version is affected by the page fault defect described in the next bullet. The upgrade stops the FS handle check (check_fd) by default and prevents it from reading large amounts of kernel data.
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Fix the kernel defect. For more information, see Page fault exception causes system downtime on ECS instances running Alibaba Cloud Linux 2 .
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Log on to the ACK console. In the left navigation pane, click Clusters.
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On the Clusters page, click the name of your cluster. In the left navigation pane, click Components and Add-ons .
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On the Add-ons page, click the Logs and Monitoring tab. In the lower-right corner of ack-node-problem-detector, click Upgrade.
If the ack-node-problem-detector panel does not show an Upgrade button, the add-on is already the latest version and does not need to be upgraded.
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In the dialog box that appears, click OK.