Tutorials

Hands-on guides for common Kubernetes tasks. Click any card to expand.

Debugging

Debug a Crashlooping Pod Beginner

Identify and fix CrashLoopBackOff errors

What you will learn

When a pod enters CrashLoopBackOff, Kubernetes is restarting it repeatedly because the container keeps exiting with an error. Common causes include:

Application crashes on startup (missing config, bad entrypoint)
Out of memory (OOMKilled)
Failed health checks (liveness probe failures)
Missing dependencies (database not reachable, secret not mounted)

Try it with Sabre

Terminal

$ sabre "Why is my pod crashlooping?"

Sabre will inspect pod events, check container logs, and identify the root cause -- whether it's a misconfigured command, a missing environment variable, or a resource limit issue.

Fix Image Pull Errors Beginner

Resolve ImagePullBackOff and ErrImagePull issues

What you will learn

ImagePullBackOff means Kubernetes cannot pull the container image. This is usually caused by:

Typo in the image name or tag
Image does not exist in the registry
Missing or incorrect image pull secrets
Private registry without authentication configured

Try it with Sabre

Terminal

$ sabre "Fix the image pull error on my deployment"

Sabre will check the image reference, verify registry access, and inspect pull secrets to pinpoint exactly why the image cannot be pulled.

Diagnose Pending Pods Intermediate

Find out why pods are stuck in Pending state

What you will learn

Pods stuck in Pending state have not been scheduled to a node. Common scheduling issues include:

Insufficient CPU or memory on available nodes
Node affinity or anti-affinity rules that cannot be satisfied
Taints on nodes without matching tolerations
PersistentVolumeClaim not bound (storage not available)
ResourceQuota limits exceeded in the namespace

Try it with Sabre

Terminal

$ sabre "Why are my pods stuck in pending?"

Sabre will analyze scheduler events, check node capacity, review resource requests, and identify the constraint preventing scheduling.

Configuration

Set Up RBAC Permissions Intermediate

Create roles and role bindings for fine-grained access control

What you will learn

Kubernetes RBAC (Role-Based Access Control) lets you define who can do what in your cluster. You will learn how to:

Create a Role scoped to a specific namespace
Define which API resources and verbs are permitted
Bind the role to a user or service account
Test that the permissions work correctly

Try it with Sabre

Terminal

$ sabre "Create a role that allows reading pods in the dev namespace"

Sabre will generate the Role and RoleBinding manifests, apply them to your cluster, and verify the permissions are working.

Configure Horizontal Pod Autoscaler Intermediate

Automatically scale deployments based on resource usage

What you will learn

The Horizontal Pod Autoscaler (HPA) automatically adjusts the number of pod replicas based on observed metrics. You will learn how to:

Create an HPA targeting a deployment
Set minimum and maximum replica counts
Configure CPU-based scaling thresholds
Verify the autoscaler is working

Try it with Sabre

Terminal

$ sabre "Set up autoscaling for my-app deployment to scale between 2-10 pods based on CPU"

Sabre will create the HPA resource, ensure metrics-server is available, and confirm the autoscaler is actively monitoring your deployment.

Learn More

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Getting Started

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