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     1. Operating Systems
     2. Google Container-Optimized OS (COS)

          Google Container-Optimized OS (COS)

          google os
        📅 Last updated on 08 March 2026 🤖

        Google Container-Optimized OS (COS) is an operating system image for GCP Compute Engine VMs which is optimized for running Docker containers. It is maintained by Google and is based on the open source Chromium OS project.

          Release                          Released                   Support Status                   Latest              
          125 (LTS)                        5 months ago               Ends in 1 year and 5 months      cos-125-19216-220-34
                                             (09 Oct 2025)              (01 Sep 2027)                    (04 Mar 2026)     
          121 (LTS)                        11 months ago              Ends in 11 months                cos-121-18867-381-24
                                             (14 Apr 2025)              (01 Mar 2027)                    (04 Mar 2026)     
          117 (LTS)                        1 year and 5 months ago    Ends in 5 months and 3 weeks     cos-117-18613-534-24
                                             (02 Oct 2024)              (01 Sep 2026)                    (04 Mar 2026)     
          113 (LTS)                        1 year and 11 months ago   Ended 1 week and 2 days ago      cos-113-18244-582-29
                                             (15 Apr 2024)              (01 Mar 2026)                    (04 Mar 2026)     
          109 (LTS)                        2 years and 5 months ago   Ended 6 months ago               cos-109-17800-570-50
                                             (27 Sep 2023)              (01 Sep 2025)                    (24 Sep 2025)     
          105 (LTS)                        2 years and 11 months ago  Ended 11 months ago              cos-105-17412-535-98
                                             (03 Apr 2023)              (01 Apr 2025)                    (31 Mar 2025)     
          101 (LTS)                        3 years and 5 months ago   Ended 1 year and 6 months ago    cos-101-17162-528-64
                                             (15 Sep 2022)              (01 Sep 2024)                    (21 Oct 2024)     
          97 (LTS)                         3 years and 11 months ago  Ended 2 years ago                cos-97-16919-450-41 
                                             (29 Mar 2022)              (01 Mar 2024)                    (27 Mar 2024)     
          93 (LTS)                         4 years ago                Ended 2 years and 5 months ago   cos-93-16623-461-42 
                                             (18 Oct 2021)              (01 Oct 2023)                    (24 Oct 2023)     
          89 (LTS)                         4 years and 11 months ago  Ended 3 years ago                cos-89-16108-798-22 
                                             (07 Apr 2021)              (01 Mar 2023)                    (03 Apr 2023)     
          85 (LTS)                         5 years ago                Ended 3 years and 6 months ago   cos-85-13310-1498-13
                                             (24 Sep 2020)              (01 Sep 2022)                    (22 Aug 2022)     
          81 (LTS)                         5 years and 11 months ago  Ended 4 years and 6 months ago   cos-81-12871-1317-8 
                                             (27 Mar 2020)              (01 Sep 2021)                    (10 Jan 2022)     
          77 (LTS)                         6 years ago                Ended 4 years and 11 months ago  cos-77-12371-1109-0 
                                             (27 Sep 2019)              (01 Apr 2021)                    (11 Jan 2021)     
          73 (LTS)                         6 years and 11 months ago  Ended 5 years and 9 months ago   cos-73-11647-656-0  
                                             (25 Mar 2019)              (01 Jun 2020)                    (05 Sep 2020)     
          69 (LTS)                         7 years ago                Ended 6 years ago                cos-69-10895-385-0  
                                             (18 Sep 2018)              (01 Dec 2019)                    (08 Oct 2019)     
          Show more unmaintained releases
          

          Support policy

          Container-Optimized OS is tested and qualified for running various container workloads on Google Cloud. It is actively patched with security updates (CVEs) and bug-fixes to address issues that impact Google Cloud users. Users get access to these fixes via image releases in the cos-cloud project.

          Container-Optimized OS image support is available for Long-Term Supported (LTS) family of images in the cos-cloud project. A description of available image families is available at the Versioning Scheme doc. The following support commitment applies only to the LTS family of images.

          Support duration

          Approximately twice each year, the Container-Optimized OS team releases a Long-Term Supported (LTS) milestone on its cos-[MILESTONE]-lts and cos-arm64-[MILESTONE]-lts image families. Once a milestone is introduced on the LTS families, it is supported for 2 years.

          During this support window:

            * The milestone is actively patched for any critical bugs.
            * The milestone is actively scanned for security vulnerabilities, and security fixes are applied regularly.
            * New releases containing high-priority bug and security fixes are released on-demand.
            * New releases containing medium and low-priority bug and security fixes are released every 3 months.
            * To maintain stability, no new breaking features are introduced.
            * All changes in the image are documented on a dedicated release notes page.

          Deprecation

          At the end of a milestone’s support window, the corresponding cos-[MILESTONE]-lts and cos-arm64-[MILESTONE]-lts families are deprecated. Specifically, the DEPRECATED flag is set on images in that milestone and those images stop appearing in the active list of images in the cos-cloud project.

          Any Image Family API references to the deprecated image family will return errors and break any workflows depending on it. You should not use this API to create production instances.

          Deprecated images are still accessible and usable when accessed directly by name using the images get API. However, any issues with those images might not be fixed or will only be fixed in newer milestones. Issues reported against deprecated images may be fixed only in newer image milestones.

        More information is available on the Google Container-Optimized OS (COS) website.

        You should be running one of the supported release numbers listed above in the rightmost column.

          cat /etc/os-release /etc/lsb-release
        Show Product Identifiers
          * cpe: cpe:2.3:o:google:container-optimized_os
          * cpe: cpe:/o:google:container-optimized_os

        You can submit an improvement to this page on GitHub . This page has also a corresponding Talk Page 💬.

        A JSON version of this page is available at /api/v1/products/cos/ 📡. See the API Documentation 📖 for more information. You can subscribe to the RSS feed at /cos.atom ⚛️ or to the iCalendar feed at /calendar/cos.ics 📅.

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