#KUBERNETES #CHEATSHEET

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|                  KUBERNETES CHEAT SHEET                     |

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**Kubernetes Architecture:**

1. **Node Components:**

   - kubelet: Node agent managing containers.

   - kube-proxy: Maintains network rules on nodes.

   - Container Runtime: Docker, containerd, or others.

2. **Control Plane Components:**

   - kube-apiserver: Exposes the Kubernetes API.

   - etcd: Consistent and highly-available key-value store.

   - kube-controller-manager: Manages controllers.

   - kube-scheduler: Assigns nodes to pods.

**Kubectl Basics:**

3. **Cluster Information:**

   - `kubectl cluster-info`: Display cluster information.

   - `kubectl get nodes`: List nodes in the cluster.

4. **Working with Pods:**

   - `kubectl get pods`: List pods in the default namespace.

   - `kubectl describe pod <pod-name>`: Show pod details.

   - `kubectl exec -it <pod-name> -- /bin/bash`: Access pod shell.

   - `kubectl logs <pod-name>`: View pod logs.

5. **Creating Resources:**

   - `kubectl apply -f <yaml-file>`: Create or update resources.

   - `kubectl delete -f <yaml-file>`: Delete resources.

**Kubernetes Resources:**

6. **Deployments:**

   - `kubectl get deployments`: List deployments.

   - `kubectl scale deployment <deployment-name> --replicas=<count>`: Scale a deployment.

7. **Services:**

   - `kubectl get services`: List services.

   - `kubectl expose deployment <deployment-name> --port=<port>`: Create a service.

8. **ConfigMaps and Secrets:**

   - `kubectl create configmap <configmap-name> --from-file=<file>`: Create a ConfigMap.

   - `kubectl create secret generic <secret-name> --from-literal=<key>=<value>`: Create a secret.

**Managing Resources:**

9. **Namespace:**

   - `kubectl get namespaces`: List namespaces.

   - `kubectl create namespace <namespace-name>`: Create a namespace.

10. **Labeling and Selectors:**

    - `kubectl label <resource-type> <resource-name> <key>=<value>`: Add labels.

    - `kubectl get <resource-type> -l <key>=<value>`: Select by label.

11. **Resource Quotas and Limits:**

    - `kubectl describe resourcequota <resourcequota-name>`: View resource quotas.

    - `kubectl describe pod <pod-name>`: View resource limits.

**Kubernetes Networking:**

12. **Services and Ingress:**

    - `kubectl get svc -n <namespace>`: List services in a namespace.

    - `kubectl get ingress -n <namespace>`: List ingress resources.

13. **Networking Policies:**

    - Define network policies to control pod-to-pod communication.

**Kubernetes Advanced Topics:**

14. **StatefulSets:**

    - `kubectl get statefulsets`: List StatefulSets.

    - Manages stateful, ordered deployment of pods.

15. **DaemonSets:**

    - `kubectl get daemonsets`: List DaemonSets.

    - Ensures a copy of a pod runs on all or some nodes.

**Kubernetes Monitoring and Logging:**

16. **Monitoring with Prometheus:**

    - Set up Prometheus for monitoring cluster metrics.

17. **Logging with Fluentd:**

    - Implement Fluentd for log collection.

**Additional Resources:**

18. **Official Kubernetes Documentation:**

    - [Kubernetes Official Documentation](https://kubernetes.io/docs/home/)

19. **Kubernetes Community:**

    - [Kubernetes GitHub](https://github.com/kubernetes)

    - [Kubernetes Community](https://kubernetes.io/community/)

20. **Kubernetes Forums and Support:**

    - [Kubernetes Stack Overflow](https://stackoverflow.com/questions/tagged/kubernetes)

    - [Kubernetes Reddit](https://www.reddit.com/r/kubernetes/)