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What the MCP returns at this step

41 · Engineering · Cloud Operations

Google GKE Reliability

Improves GKE workload reliability, using PDBs, health probes, and topology

engineeringcloud-operationsgoogle-cloudgke-reliability

Google GKE Reliability · Original SKILL.md

---
name: gke-reliability
description: >-
  Improves GKE workload reliability, using PDBs, health probes, and topology
  spread constraints. Use when configuring GKE workload reliability, setting up
  PDBs, or configuring GKE health probes (liveness, readiness, startup). Don't
  use for generating K8s YAML manifests (use gke-manifest-generation) or
  disaster recovery and cluster backups (use gke-backup-dr).
metadata:
  version: "1.0.1"
  category: Containers
---

# GKE Reliability

> **Routing Note:** To generate Kubernetes YAML manifests (`Deployment`, `StatefulSet`, `Service`, `ConfigMap`, `HTTPRoute`, `PodDisruptionBudget`), open `gke-manifest-generation/SKILL.md`.

This reference covers high availability and reliability configuration for GKE
clusters and workloads.

> **MCP Tools:** `get_cluster`, `get_k8s_resource`, `describe_k8s_resource`,
> `apply_k8s_manifest`, `list_k8s_events`

## Golden Path Reliability Defaults

| Setting          | Golden Path Value     | Notes                            |
| ---------------- | --------------------- | -------------------------------- |
| Cluster type     | Regional (4 zones:    | Control plane replicated across  |
:                  : us-central1-a/b/c/f)  : zones                            :
| Upgrade strategy | SURGE (`maxSurge: 1`) | Rolling upgrades with extra      |
:                  :                       : capacity                         :
| Auto-repair      | `true`                | Unhealthy nodes replaced         |
:                  :                       : automatically                    :
| Auto-upgrade     | `true`                | Nodes follow control plane       |
:                  :                       : version                          :
| Release channel  | REGULAR               | Balanced freshness and stability |
| Stateful HA      | Enabled               | Leader election for stateful     |
:                  :                       : workloads                        :

## Workflows

### 1. Verify Cluster High Availability

```
# MCP (preferred)
get_cluster(name="projects/<PROJECT>/locations/<REGION>/clusters/<CLUSTER>",
  readMask="location,locations,nodePools.locations")

# gcloud fallback
gcloud container clusters describe <CLUSTER> --region <REGION> \
  --format="json(location, locations)" \
  --quiet
```

-   If `location` is a region (e.g., `us-central1`), the control plane is
    regional
-   If `locations` has multiple entries, nodes span multiple zones

### 2. Pod Disruption Budgets (PDBs)

PDBs ensure minimum pod availability during voluntary disruptions (node
upgrades, autoscaler scale-down).

**Check existing PDBs:**

```
# MCP (preferred)
get_k8s_resource(parent="...", resourceType="poddisruptionbudget")

# kubectl fallback
kubectl get pdb --all-namespaces
```

**Create PDB:**

```yaml
apiVersion: policy/v1
kind: PodDisruptionBudget
metadata:
  name: my-app-pdb
  namespace: default
spec:
  minAvailable: 2       # Or use maxUnavailable: 1
  selector:
    matchLabels:
      app: my-app
```

> Every production Deployment with 2+ replicas should have a PDB.

### 3. Health Probes

Every production container should have liveness and readiness probes. Startup
probes are recommended for slow-starting apps.

**Check existing probes:**

```
# MCP (preferred)
describe_k8s_resource(parent="...", resourceType="deployment", name="<APP>", namespace="<NS>")

# kubectl fallback
kubectl get deployment <APP> -n <NS> -o yaml | grep -E "livenessProbe|readinessProbe|startupProbe"
```

**Recommended probe configuration:**

```yaml
spec:
  containers:
  - name: app
    livenessProbe:
      httpGet:
        path: /healthz
        port: 8080
      initialDelaySeconds: 15
      periodSeconds: 10
      timeoutSeconds: 2
      failureThreshold: 3
    readinessProbe:
      httpGet:
        path: /readyz
        port: 8080
      initialDelaySeconds: 5
      periodSeconds: 5
      timeoutSeconds: 2
      failureThreshold: 3
    startupProbe:             # For slow-starting apps
      httpGet:
        path: /healthz
        port: 8080
      initialDelaySeconds: 10
      periodSeconds: 5
      timeoutSeconds: 2
      failureThreshold: 30    # 30 * 5s = 150s max startup time
```

-   **Readiness**: Determines when a pod can accept traffic
-   **Liveness**: Determines when to restart a container
-   **Startup**: Disables liveness/readiness until the app is ready (prevents
    premature restarts)

### 4. Graceful Shutdown

Ensure applications handle `SIGTERM` and drain in-flight requests:

```yaml
spec:
  terminationGracePeriodSeconds: 30    # Default; increase for long-running requests
  containers:
  - name: app
    lifecycle:
      preStop:
        exec:
          command: ["/bin/sh", "-c", "sleep 5"]  # Allow LB to deregister
```

### 5. Topology Spread Constraints

Distribute pods across zones and nodes to survive failures:

```yaml
spec:
  topologySpreadConstraints:
  - maxSkew: 1
    topologyKey: topology.kubernetes.io/zone
    whenUnsatisfiable: DoNotSchedule
    labelSelector:
      matchLabels:
        app: my-app
  - maxSkew: 1
    topologyKey: kubernetes.io/hostname
    whenUnsatisfiable: ScheduleAnyway
    labelSelector:
      matchLabels:
        app: my-app
```

-   **Zone spread** (`DoNotSchedule`): Hard requirement -- pods must be balanced
    across zones
-   **Node spread** (`ScheduleAnyway`): Best-effort -- prefer distribution but
    don't block scheduling

### 6. Replicas

| Workload Type        | Minimum Replicas     | Reason                         |
| -------------------- | -------------------- | ------------------------------ |
| Stateless web/API    | 2                    | Survive single pod/node        |
:                      :                      : failure                        :
| Critical services    | 3                    | Survive zone failure with zone |
:                      :                      : spread                         :
| Stateful (databases) | 3 (with replication) | Application-level quorum       |
| Batch/jobs           | 1                    | Ephemeral by nature            |

## Best Practices & Production Guidelines

1.  **Regional clusters for production**: Always use regional clusters to
    survive zone failures.
2.  **PDBs for everything**: Every production workload with 2+ replicas needs a
    PodDisruptionBudget (PDB) to protect against voluntary disruptions.
3.  **Probes with Explicit Timeouts**: Every production container must have both
    liveness and readiness probes defined. **Always explicitly define
    `initialDelaySeconds`, `periodSeconds`, and `timeoutSeconds`** for all
    probes. Never rely on the Kubernetes default timeout of 1 second if your
    application requires more, but always set a strict limit to prevent hanging
    connections.
4.  **Zone spreading**: Use topology spread constraints to distribute pods
    across failure domains (zones and nodes).
5.  **Graceful shutdown**: Handle `SIGTERM` and set appropriate
    `terminationGracePeriodSeconds` with a `preStop` sleep hook to allow load
    balancer deregistration.
6.  **Maintenance windows**: Schedule upgrades during low-traffic periods (see
    the `gke-upgrades` skill).

When to use

Improves GKE workload reliability, using PDBs, health probes, and topology

What you get

Complete original Google guidance with source attribution and declared execution limits.

How it works

Use supplied evidence to plan, review or explain the relevant workflow within authorized scope.

Requirements

Authorized project context, resource scope, current configuration evidence and a named decision owner.

Delivery and review notes

The original is official Apache-2.0 guidance. It may show cloud commands, deployment examples or credential placeholders; those are not run, configured, installed, or authorized by loading this catalog entry. Verify current provider documentation and resource-owner approval before external changes.

Starting prompt

Use Google GKE Reliability for [TASK]. Start from authorized project context and supplied evidence. Identify unknowns and propose changes for review; do not run commands, connect accounts, deploy, transfer data, or incur charges from this text alone.

Not for

Automatic cloud execution, credential handling, account access, deployments, destructive changes, or claims that examples are configured and verified.

What M11 added

M11 added German routing, integrity tracking and a strict no-execution boundary. Original attribution: Google (google/skills repository). The original is official Apache-2.0 guidance. It may show cloud commands, deployment examples or credential placeholders; those are not run, configured, installed, or authorized by loading this catalog entry. Verify current provider documentation and resource-owner approval before external changes.

Original authorship remains with google/skills · Original source ↗

Original license & copyright

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Source SHA-256: 965c75a0a7c219137efe09fdea067f6fb0c0751b12485108c95c407fc8a10ef2
Snapshot checked: 2026-10-05T00:00:00.000Z

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