ConfigMaps, Secrets, PersistentVolumes and Claims, StorageClasses, RBAC, ServiceAccounts, Pod Security and CKAD and CKS topics.
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- What are ConfigMaps used for in Kubernetes?
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Storing non-sensitive configuration data as key-value pairs that can be consumed by Pods- How do you create a ConfigMap from a literal key-value pair on the command line?
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kubectl create configmap <name> --from-literal=<key>=<value>- Can ConfigMaps store binary data?
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No, ConfigMaps store only text data as key-value strings- What is the maximum size of a ConfigMap?
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1 MB- How do you inject ConfigMap data as environment variables into a Pod?
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Use envFrom.configMapRef with the ConfigMap name, or env.valueFrom.configMapKeyRef for individual keys- What encoding does Kubernetes use for Secret data at rest in etcd?
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Base64 by default (base64 is encoding, not encryption)- How do you create a generic Secret from a file using kubectl?
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kubectl create secret generic <name> --from-file=<path>- What is the maximum size of a Kubernetes Secret?
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1 MB- When would you use a kubernetes.io/dockercfg Secret type?
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To store Docker registry credentials for pulling images from private registries- What is the main difference between Secrets and ConfigMaps regarding data sensitivity?
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Secrets are intended for sensitive data, while ConfigMaps are for non-sensitive configuration- What is a PersistentVolume?
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A cluster-level storage resource that exists independently of any Pod- What is a PersistentVolumeClaim?
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A request for storage by a Pod, which binds to an available PersistentVolume- Name the three PersistentVolume access modes
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ReadWriteOnce (RWO), ReadOnlyMany (ROX), ReadWriteMany (RWX)- What does it mean when a PersistentVolumeClaim status is Bound?
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The PVC has successfully matched with an available PersistentVolume- What is a reclaim policy for a PersistentVolume?
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The action taken when a PVC is deleted: either Retain, Delete, or Recycle
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