feat: add k8s-certifications

k8s-certifications/README.md

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+[![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)](LICENSE)
+[![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square)](http://makeapullrequest.com)
+
+# Kubernetes Exercises
+
+This collection covers a set of exercises that are categorized topics wise and referred back to the individual Kubernetes certification exams.
+As the exam pattern and topics keep on changing, however, the topics remain more or less the same, I have created the exercises per topics and mapped them back to the exam.
+
+## Kubernetes Playground
+
+Try out the Killercoda Kubernetes playgroud which provides 2 node Kubernetes cluster, which is good enough to complete almost all of the exercises.
+
+[Killercoda](https://killercoda.com/playgrounds/scenario/kubernetes)  
+~~[Katacode Kubernetes Playgroud](https://www.katacoda.com/courses/kubernetes/playground)~~  
+
+
+<a target="_blank" href="https://shareasale.com/r.cfm?b=2530382&amp;u=2367365&amp;m=59485&amp;urllink=&amp;afftrack="><img src="https://static.shareasale.com/image/59485/lft_iwd24_901x501a1.png" border="0" /></a>
+
+## Structure 
+
+ - [Certified Kubernetes Administrator (CKA)](cka) covers topics for CKA exam.
+ - [Certified Kubernetes Application Developer (CKAD)](ckad) covers topics for CKAD exam.
+ - [Certified Kubernetes Security Specialist (CKS)](cks) covers topics for CKS exam.
+ - [Data](data) provides any data required for the exercises.
+ - [Topics](topics) covers individual topics.
+
+## Exam Pattern & Tips
+
+ - CKA/CKAD/CKS are open book test.
+ - Exams keep on upgrading as per the latest Kubernetes version and is currently on 1.28
+ - Exams require you to solve 15-20 questions in 2 hours.
+ - Make use of imperative commands as much as possible.
+ - You will have an online notepad on the right corner to note down. I hardly used it, but it can be useful to type and modify text instead of using Vi editor.
+ - You are allowed to open another browser tab which can be from kubernetes.io or other products documentation like Falco. Do not open any other windows.
+ - Exam questions can be attempted in any order and don't have to be sequential. So be sure to move ahead and come back later.
+
+
+
+
+
+
+
+
+

k8s-certifications/cka/1.cluster_architecture_installation_configuration.md

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+# Cluster Architecture, Installation & Configuration - 25%
+
+<br />
+
+## Manage role based access control (RBAC)
+
+<br />
+
+Refer [RBAC](../topics/rbac.md)
+
+<br />
+
+## Use Kubeadm to install a basic cluster
+
+<br />
+
+Refer [Creating cluster using Kubeadm](https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/)
+
+<br />
+
+## Manage a highly-available Kubernetes cluster
+
+<br />
+
+Refer [Creating HA Kubernete cluster](https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/high-availability/)
+
+<br />
+
+## Provision underlying infrastructure to deploy a Kubernetes cluster
+
+<br />
+
+TBD
+
+<br />
+
+## Perform a version upgrade on a Kubernetes cluster using Kubeadm
+
+<br />
+
+Refer [Upgrading Kubeadm Clusters](../topics/cluster_upgrade.md)
+
+<br />
+
+## Implement etcd backup and restore
+
+<br />
+
+Refer [ETCD](../topics/etcd.md)
+

k8s-certifications/cka/2.workloads_scheduling.md

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+# Workloads & Scheduling - 15%
+
+<br />
+
+## Understand deployments and how to perform rolling update and rollbacks
+
+<br />
+
+Refer [Deployment Rollouts](../topics/deployments.md#deployment-rollout)
+
+<br />
+
+## Use ConfigMaps and Secrets to configure applications
+
+<br />
+
+Refer [ConfigMaps](../topics/configmaps.md)  
+Refer [Secrets](../topics/secrets.md)  
+
+<br />
+
+## Know how to scale applications
+
+<br />
+
+Refer [Deployment Scaling](../topics/deployments.md#deployment-scaling)
+
+<br />
+
+## Understand the primitives used to create robust, self-healing, application deployments
+
+<br />
+
+Refer [Deployment Scaling](../topics/deployments.md##deployment-self-healing)
+
+<br />
+
+## Understand how resource limits can affect Pod scheduling
+
+<br />
+
+Refer [Resources - Requests & Limits](../topics/pods.md#resources)
+
+<br />
+
+## Awareness of manifest management and common templating tools
+
+<br />
+
+TBD
+
+<br />

k8s-certifications/cka/3.services_networking.md

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+# Services & Networking - 20%
+
+<br />
+
+## Understand host networking configuration on the cluster nodes
+
+<br />
+
+TBD
+
+<br />
+
+## Understand connectivity between Pods
+
+<br />
+
+Refer [Cluster Networking](https://kubernetes.io/docs/concepts/cluster-administration/networking/)
+
+<br />
+
+## Understand ClusterIP, NodePort, LoadBalancer service types and endpoints
+
+Refer [Services](../topics/services.md)
+
+## Know how to use Ingress controllers and Ingress resources
+
+Refer [Ingress](../topics/ingress.md)
+
+## Know how to configure and use CoreDNS
+
+<br />
+
+Refer [CoreDNS for Service Discovery](https://kubernetes.io/docs/tasks/administer-cluster/coredns/)
+
+<br />
+
+## Choose an appropriate container network interface plugin
+
+<br />
+
+Refer [Network Plugins](https://kubernetes.io/docs/concepts/extend-kubernetes/compute-storage-net/network-plugins/)
+
+<br />

k8s-certifications/cka/4.storage.md

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+# Storage - 10%
+
+<br />
+
+## Understand storage classes, persistent volumes
+
+<br />
+
+Refer [Volumes](../topics/volumes.md)
+
+<br />
+
+## Understand volume mode, access modes and reclaim policies for volumes
+
+<br />
+
+Refer [PV Volume mode](https://kubernetes.io/docs/concepts/storage/persistent-volumes/#volume-mode) -- Refer [PV Access modes](https://kubernetes.io/docs/concepts/storage/persistent-volumes/#access-modes), Refer [PV Reclaim policies](https://kubernetes.io/docs/concepts/storage/persistent-volumes/#reclaim-policy)
+
+<br />
+
+## Understand persistent volume claims primitive
+
+<br />
+
+Refer [Persistent Volume Claims](https://kubernetes.io/docs/concepts/storage/persistent-volumes/#persistentvolumeclaims)
+
+<br />
+
+## Know how to configure applications with persistent storage
+
+<br />
+
+Refer [Volumes](../topics/volumes.md)
+
+<br />

k8s-certifications/cka/5.troubleshooting.md

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+# Troubleshooting - 30%
+
+<br />
+
+## Evaluate cluster and node logging
+
+<br />
+
+Refer [Cluster Logging](https://kubernetes.io/docs/tasks/debug-application-cluster/debug-cluster/#looking-at-logs)
+
+<br />
+
+## Understand how to monitor applications
+
+<br />
+
+Refer [Monitoring](../topics/monitoring.md)
+
+<br />
+
+## Manage container stdout & stderr logs
+
+<br />
+
+TBD
+
+<br />
+
+## Troubleshoot application failure
+
+<br />
+
+Refer [Deployment Troubleshooting](../topics/deployments.md#troubleshooting)  
+Refer [Probes Troubleshooting](../topics/probes.md#troubleshooting)  
+Refer [Application Troubleshooting](https://kubernetes.io/docs/tasks/debug-application-cluster/debug-application/)
+
+<br />
+
+## Troubleshoot cluster component failure
+
+<br />
+
+TBD
+
+<br />
+
+## Troubleshoot networking
+
+<br />
+
+TBD
+
+<br />
+

k8s-certifications/cka/README.md

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+# Certified Kubernetes Administrator (CKA)
+
+## [CKA Curriculum](https://github.com/cncf/curriculum/blob/master/CKA_Curriculum_v1.22.pdf)
+
+1. [Cluster Architecture, Installation & Configuration - 25%](1.cluster_architecture_installation_configuration.md)
+2. [Workloads & Scheduling - 15%](2.workloads_scheduling.md)
+3. [Services & Networking - 20%](3.services_networking.md)
+4. [Storage - 10%](4.storage.md)
+5. [Troubleshooting - 30%](5.troubleshooting.md)
+
+## Resources
+
+ - [Certified Kubernetes Administrator - CKA learning path](https://jayendrapatil.com/certified-kubernetes-administrator-cka-learning-path/)
+ - [KodeKloud Certified Kubernetes Administrator Course](https://shareasale.com/r.cfm?b=2319101&u=2367365&m=132199&urllink=&afftrack=)
+
+<a target="_blank" href="https://shareasale.com/r.cfm?b=2530382&amp;u=2367365&amp;m=59485&amp;urllink=&amp;afftrack="><img src="https://static.shareasale.com/image/59485/lft_iwd24_901x501a1.png" border="0" /></a>

k8s-certifications/ckad/1.application_design_build.md

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+# Application Design and Build - 20%
+
+<br />
+
+## Define, build and modify container images
+
+<br />
+
+Refer [Docker](../topics/docker.md)
+
+<br />
+
+## Understand Jobs and CronJobs
+
+<br />
+
+Refer [Jobs & Cron Jobs](../topics/jobs.md)
+
+<br />
+
+## Understand multi-container Pod design patterns (e.g. sidecar, init and others)
+
+<br />
+
+Refer [Multi-container Pods](../topics/multi_container_pods.md)
+
+<br />
+
+## Utilize persistent and ephemeral volumes
+
+<br />
+
+Refer [Volumes](../topics/volumes.md)
+
+<br />

k8s-certifications/ckad/2.application_deployment.md

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+# Application Deployment - 20%
+
+<br />
+
+## Use Kubernetes primitives to implement common deployment strategies (e.g. blue/green or canary)
+
+<br />
+
+- Kubernetes supports only Recreate and Rolling deployments within the same cluster.
+- A service mesh like Istio can be used for [traffic management and canary deployments](https://istio.io/latest/docs/tasks/traffic-management/traffic-shifting/).
+
+<br />
+
+## Understand Deployments and how to perform rolling updates
+
+Refer [Deployment Rollouts](../topics/deployments.md#deployment-rollout)
+
+## Use the Helm package manager to deploy existing packages
+
+<br />
+
+ - [Helm](https://helm.sh/) can be used for templating and deployment.
+
+<br />
+

k8s-certifications/ckad/3.application_observability_maintenance.md

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+# Application Observability and Maintenance - 15%
+
+<br />
+
+## Understand API deprecations
+
+<br />
+
+Refer [API Deprectations](../topics/api_deprecations.md)
+
+<br />
+
+## Implement probes and health checks
+
+Refer [Readiness & Liveness probes](../topics/probes.md)
+
+## Use provided tools to monitor Kubernetes applications
+
+Refer [Monitoring](../topics/monitoring.md)
+
+## Utilize container logs
+
+Refer [Logging](../topics/logging.md)
+
+## Debugging in Kubernetes
+
+<br />
+
+TBD
+
+<br />
+