CKA (CNCF) case studies
CKA · Put your knowledge to work in context.
The Certified Kubernetes Administrator (CKA) is a hands-on certification created by the Cloud Native Computing Foundation in collaboration with The Linux Foundation. It is aimed at engineers who operate Kubernetes clusters day to day - cluster lifecycle and installation, upgrades, networking, storage, and on-call troubleshooting - rather than at application developers, which is the separate CKAD track. The CKA case studies are 5 cases and about 4,813 words.
1The Approved Upgrade Plan Skips a Minor Version
Your team runs a kubeadm cluster with three stacked-etcd control-plane nodes on v1.28.4 and six worker nodes whose kubelet and kubeadm packages are already at v1.29.2. CNI is Calico, and CoreDNS is the only add-on this change touches.
903 words, about 5 min2Rollout Stuck at 14 of 15 Pods, and the PDB Is Not the Reason
Four workers, 4000m allocatable CPU each after system reservations, split two per zone: worker-1 and worker-2 in zone-a , worker-3 and worker-4 in zone-b . A logging DaemonSet requests 300m on every node.
847 words, about 4 min3NodePort with Local Policy Behind a TCP Load Balancer
The cluster has six nodes: cp-1 plus worker-1 through worker-5. Deployment web runs 3 replicas, currently one each on worker-1, worker-2 and worker-3.
1,017 words, about 5 min4Local PVs, WaitForFirstConsumer, and a Released Volume
StorageClass local-ssd uses provisioner: kubernetes.io/no-proisioner , volumeBindingMode: WaitForFirstConsumer and reclaimPolicy: Retain . An admin hand-created four 100Gi PersistentVolumes, each pinned by spec.nodeAffinity to a single node: pv-1 to worker-1, pv-2 to worker-2, pv-3 to worker-3, and pv-4 to worker-1.
1,069 words, about 5 min5A ResourceQuota That Stalls a Rollout Every Hour
Namespace reporting has a ResourceQuota: pods: 20 , requests.cpu: 8 , requests.memory: 16Gi , persistentvolumeclaims: 4 . Deployment worker runs 8 replicas with requests of 750m CPU and 1Gi memory and rollingUpdate: {maxSurge: 1, maxUnavailable: 0} .
977 words, about 5 min