Préparer sa certification Kubernetes CKA

Pierre-Mickael CHANCRIN 05 mars 2021

Qu'est ce que la certification CKA ?

La CNCF propose trois certifications Kubernetes :

CKAD : Certification développeur en environnement micro-service

CKA : Certification dédiée aux administrateurs d’environnements micro-service

CKS : Certification orienté sécurité dans les environnements micro-service

A savoir que Kubernetes est un orchestrateur de container et se veut Cloud Agnostic, Kubernetes peut donc être mis en place chez n’importe quel provider Cloud.

L’examen CKA a changé en septembre 2020, voici les nouvelles grilles de notation des différentes sections :

Cluster Architecture, Installation & Configuration – 25%
Workloads & Scheduling – 15%
Services & Networking – 20%
Storage – 10%
Troubleshooting – 30%

Voici le contenu des différentes sections :

Cluster Architecture, Installation & Configuration – 25%

Manage role based access control (RBAC)
Use Kubeadm to install a basic cluster
Manage a highly-available Kubernetes cluster
Provision underlying infrastructure to deploy a Kubernetes cluster
Perform a version upgrade on a Kubernetes cluster using Kubeadm
Implement etcd backup and restore

Workloads & Scheduling – 15%

Understand deployments and how to perform rolling update and rollbacks.
Use ConfigMaps and Secrets to configure applications.
Know how to scale applications
Understand the primitives used to create robust, self-healing, application deployments
Understand how resource limits can affect Pod scheduling
Awareness of manifest management and common templating tools

Services & Networking – 20%

Understand host networking configuration on the cluster nodes
Understand connectivity between Pods
Understand ClusterIP, NodePort, LoadBalancer service types and endpoints
Know how to use Ingress controllers and Ingress resources
Know how to configure and use CoreDNS
Choose an appropriate container network interface plugin

Storage – 10%

Understand storage classes, persistent volumes
Understand volume mode, access modes and reclaim policies for volumes
Understand persistent volume claims primitive
Know how to configure applications with persistent storage

Troubleshooting – 30%

Evaluate cluster and node logging
Understand how to monitor applications
Manage container stdout & stderr logs
Troubleshoot application failure
Troubleshoot cluster component failure
Troubleshoot networking

L’examen dure maintenant 2 heures au lieu de 3 heures et comporte 17 questions au lieu de 24 questions. Le score pour l’obtenir est de 66%

La partie Security a disparu, car elle a maintenant sa propre certification CKS. La certification CKA est un prérequis indispensable pour passer la CKS.