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1. IL-0157 After a release, new nodes could not join Linode Kubernetes Engine clusters with IP ACL enabled, so autoscaling failed on about 20 to 25 clusters

   Linode2025

   Symptoms

   From about 01:00 UTC on 2025-03-05, Linode Kubernetes Engine (LKE) clusters with IP ACL enabled failed to autoscale: new nodes could not join the cluster, and some customers had service disruptions. About 20 to 25 clusters in several regions around the world were affected; the status page lists the US-IAD (Washington), US-ORD (Chicago), US-SEA (Seattle) and IN-MAA (Chennai) LKE components.

   Scale-up failureService outage

   Trigger

   Akamai deployed the latest LKE software release.

   Root cause

   Software defect

   Component

   Cluster autoscaler

   Contributing factor

   –

   Detection

   Customers began having problems at about 01:00 UTC, and the first status post, at 06:49 UTC, said the team was investigating an LKE autoscaling problem when IP ACL is turned on.

   Remediation

   • restarted the gateway pods, which gave only short-term relief
   • rolled back the release on all affected clusters

   Action items

   • Continue investigating the root cause and take preventive actions

   Lessons

   The defect hit only clusters with IP ACL enabled, and it showed when the autoscaler tried to add nodes. Restarting the gateway pods did not hold; rolling back the release ended the incident.

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