> ## Documentation Index
> Fetch the complete documentation index at: https://cloudanix.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Automate GKE Version Management Using Release Channels

### More Info:

Enroll new clusters in a Release Channel (stable or regular) so GKE manages version upgrades and security patches on a predictable cadence. This keeps the cluster on supported, patched versions.

### Risk Level

Low

### Address

Security

### Compliance Standards

* CIS GKE

### Triage and Remediation

<Tabs>
  <Tab title="Remediation">
    ### Remediation

    <AccordionGroup>
      <Accordion title="Manual Steps" defaultOpen="true">
        1. **Identify clusters and their release channel status**\
           Run on any machine with gcloud configured:
           ```bash theme={null}
           gcloud container clusters list --project PROJECT_ID \
             --format="table(name,location,releaseChannel.channel,currentMasterVersion,currentNodeVersion)"
           ```
           Note any clusters where `releaseChannel.channel` is `-` (unset).

        2. **Inspect current configuration for a specific cluster**\
           For each cluster with no release channel, run:
           ```bash theme={null}
           gcloud container clusters describe CLUSTER_NAME \
             --location LOCATION \
             --project PROJECT_ID \
             --format=json | jq '.name, .location, .releaseChannel, .currentMasterVersion, .currentNodeVersion'
           ```
           Save this output as part of your review record.

        3. **Decide whether the cluster should be managed via a release channel**
           * Confirm the cluster is production or long‑lived (not a short‑term test cluster).
           * Confirm organizational policy on release channels (e.g., `stable` for production, `regular` for non‑prod).
           * Assess workload sensitivity to version changes and maintenance‑window requirements.

        4. **Plan migration / recreation strategy**\
           Since the benchmark remediation applies to **new** clusters, decide:
           * Whether to recreate the cluster in a release channel (preferred for strict compliance).
           * Or to accept risk/exception for existing clusters that are impractical to recreate.\
             Document this decision and planned timing.

        5. **Create replacement cluster with a release channel (if chosen)**\
           On any machine with gcloud, create the new cluster:
           ```bash theme={null}
           gcloud container clusters create NEW_CLUSTER_NAME \
             --location LOCATION \
             --release-channel stable \
             --project PROJECT_ID
           ```
           Replace `stable` with `regular` if required.\
           Migrate workloads (e.g., via backup/restore, IaC redeploy, or workload migration tools) and decommission the old cluster when ready.

        6. **Verify that new clusters comply with the control**\
           After creation, confirm the release channel:
           ```bash theme={null}
           gcloud container clusters describe NEW_CLUSTER_NAME \
             --location LOCATION \
             --project PROJECT_ID \
             --format="value(releaseChannel.channel)"
           ```
           Ensure the output is `STABLE` or `REGULAR`, and record it as evidence.
      </Accordion>

      <Accordion title="Using kubectl">
        kubectl cannot configure or change GKE Release Channels, because this setting is part of the managed control plane and cluster creation parameters in GCP, not a Kubernetes API object. To remediate this finding, use the Google Cloud Console, `gcloud` CLI, or your IaC workflows as described in the Manual Steps section.
      </Accordion>

      <Accordion title="Automation">
        ```bash theme={null}
        #!/usr/bin/env bash
        # Report GKE Release Channel usage for all clusters in all projects.

        set -euo pipefail

        # Optional: restrict to specific projects by setting PROJECTS env var as a
        # space‑separated list, e.g.:
        #   PROJECTS="proj-a proj-b" ./gke-release-channel-audit.sh
        if [[ -n "${PROJECTS:-}" ]]; then
          projects=$PROJECTS
        else
          projects=$(gcloud projects list --format="value(projectId)")
        fi

        printf 'project,location,cluster,releaseChannel,issue\n'

        for project in $projects; do
          # Both zonal and regional
          clusters=$(gcloud container clusters list \
            --project="$project" \
            --format="csv[no-heading](name,location)")

          if [[ -z "$clusters" ]]; then
            continue
          fi

          while IFS=',' read -r cluster location; do
            # Describe cluster and get releaseChannel.channel (may be null)
            channel=$(gcloud container clusters describe "$cluster" \
              --location="$location" \
              --project="$project" \
              --format="value(releaseChannel.channel)")

            issue=""

            if [[ -z "$channel" ]]; then
              issue="NO_RELEASE_CHANNEL_CONFIGURED"
            elif [[ "$channel" != "STABLE" && "$channel" != "REGULAR" ]]; then
              # E.g. RAPID or unexpected values
              issue="NON_COMPLIANT_CHANNEL"
            fi

            printf '%s,%s,%s,%s,%s\n' \
              "$project" "$location" "$cluster" "${channel:-NONE}" "$issue"
          done <<< "$clusters"
        done
        ```

        Run from: any machine with `gcloud` access to the relevant projects.

        Interpretation:

        * Compliant: rows where `issue` is empty and `releaseChannel` is `STABLE` or `REGULAR`.
        * Problematic for this control:
          * `issue=NO_RELEASE_CHANNEL_CONFIGURED` (cluster not enrolled in any release channel).
          * `issue=NON_COMPLIANT_CHANNEL` (e.g. `releaseChannel` is `RAPID` or another value not allowed by your policy).
      </Accordion>
    </AccordionGroup>
  </Tab>
</Tabs>