Pod
A Pod is the smallest deployable unit in Kubernetes, wrapping one or more containers that share network and storage. CKA troubleshooting starts with Pod status such as Pending, CrashLoopBackOff, or ImagePullBackOff.
All CKA Terms
Pod
A Pod is the smallest deployable unit in Kubernetes, wrapping one or more containers that share network and storage.
kubectl
kubectl is the command-line client used to inspect and control a Kubernetes cluster through the API server.
kubeadm
kubeadm is the official tool for bootstrapping a Kubernetes cluster and performing control-plane version upgrades.
etcd
etcd is the distributed key-value store that holds all Kubernetes cluster state.
Control Plane
The control plane is the set of components — API server, scheduler, controller manager, and etcd — that manage the cluster's desired state.
kubelet
The kubelet is the node agent that starts and monitors the Pods assigned to its node.
Deployment
A Deployment manages a replicated, self-healing set of Pods and supports rolling updates and rollbacks.
Service
A Service gives a stable virtual IP and DNS name to a changing set of Pods, with types ClusterIP, NodePort, and LoadBalancer.
Ingress
An Ingress routes external HTTP and HTTPS traffic to Services based on host and path rules, and requires a running Ingress controller.
NetworkPolicy
A NetworkPolicy specifies which connections are allowed to and from Pods, defaulting to deny once a Pod is selected.
CoreDNS
CoreDNS is the default in-cluster DNS server that resolves Service and Pod names to addresses.
PersistentVolumeClaim
A PersistentVolumeClaim (PVC) is a Pod's request for storage that binds to a PersistentVolume, often provisioned dynamically through a StorageClass.
StorageClass
A StorageClass defines a class of storage and enables dynamic provisioning of PersistentVolumes on demand.
Taints and Tolerations
Taints and Tolerations are a scheduling pair: a taint repels Pods from a node unless the Pod carries a matching toleration, giving fine control over placement.
RBAC
Role-Based Access Control (RBAC) grants permissions through Roles and ClusterRoles bound to users or ServiceAccounts.