Removing MGLRU dependency from Google cloud cluster toolkit#4255
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shubpal07 merged 1 commit intoJun 9, 2025
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@shubpal07 Please run the relevant blueprint tests before merging |
ighosh98
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Jun 9, 2025
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PR tests for the corresponding Machine types passed. |
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Submission Checklist
This change removes the
disable-mglruDaemonSet and its associated configurations from our cluster toolkit. This workaround was originally implemented to mitigate a critical bug in specific GKE versions (1.30.0 to 1.30.5 and 1.31.0 to 1.31.1) where the MGLRU-enabled kernel caused incorrect memory accounting by thekubelet, leading to cluster instability and erroneous pod evictions.Google has since resolved this issue by disabling MGLRU by default in the underlying Container-Optimized OS (COS) for all patched and current GKE versions. As a result, this workaround is now obsolete for any actively maintained GKE cluster and its continued presence in our toolkit adds unnecessary complexity.
Verified that all current GKE versions available in the Rapid, Regular, and Stable release channels use node images with MGLRU disabled by default, as per Google's official documentation.
Related Issues/References
Kubernetes Bug Report: Kubernetes Issue #127844
GKE Known Issues (Historical): Increased Pod eviction rates on GKE versions 1.30 and 1.31.
https://cloud.google.com/kubernetes-engine/docs/troubleshooting/known-issues#increased-pod-eviction-mglru
https://cloud.google.com/kubernetes-engine/docs/release-notes
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