Container-Optimized OS release notes

Warning: Milestone 105 introduces a new logging agent named fluent-bit that can be optionally used. However, fluent-bit will become the default logging agent in all future milestones after 105. See here for how to enable fluent-bit on x86 COS 105 images.

The following table provides a summary of Container-Optimized OS releases available on Compute Engine:

Active Milestones

OS version	Image project	x86 image family	Arm image family	Built by	End of support	Release notes
COS 121 DEV	cos-cloud	cos-dev	cos-arm64-dev	Google	TBD	dev
COS 117 LTS	cos-cloud	cos-117-lts	cos-arm64-117-lts	Google	Sept 2026	milestone 117
COS 113 LTS	cos-cloud	cos-113-lts	cos-arm64-113-lts	Google	March 2026	milestone 113
COS 109 LTS	cos-cloud	cos-109-lts	cos-arm64-109-lts	Google	Sept 2025	milestone 109
COS 105 LTS	cos-cloud	cos-105-lts	cos-arm64-105-lts	Google	March 2025	milestone 105

Deprecated Milestones

OS version	Image project	x86 image family	Arm image family	Built by	Deprecation date	Release notes
COS 101 LTS	cos-cloud	cos-101-lts	N/A	Google	Oct 2024	milestone 101
COS 97 LTS	cos-cloud	cos-97-lts	N/A	Google	April 2024	milestone 97
COS 93 LTS	cos-cloud	cos-93-lts	N/A	Google	October 2023	milestone 93
COS 89 LTS	cos-cloud	cos-89-lts	N/A	Google	March 2023	milestone 89
COS 85 LTS	cos-cloud	cos-85-lts	N/A	Google	September 2022	milestone 85
COS 81 LTS	cos-cloud	cos-81-lts	N/A	Google	September 2021^1	milestone 81
COS 77 LTS	cos-cloud	cos-77-lts	N/A	Google	April 2021^1	milestone 77
COS 73 LTS	cos-cloud	cos-73-lts	N/A	Google	June 2020	milestone 73
COS 69 LTS	cos-cloud	cos-69-lts	N/A	Google	December 2019	milestone 69

1. COS 77 LTS and COS 81 LTS, when bundled with GKE, have slightly longer support durations. GKE users should consult the GKE release schedule for details. ↩

Development Release Notes

For release notes related to the milestone under development, see the Development Release Notes page.

For release notes related to cos-dev before M93, see the Legacy Release Notes page.

Note: Kubernetes version provided in the changelog corresponds to the Kubelet and the Kubectl version that are shipped in that Container-Optimized OS image. Also, these component version may not be used when running a GKE cluster using a Container-Optimized OS image.

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