Kubernetes Components & Concepts:

This repo is a result of Kubernetes in Action reading. which is one of the best books that have been written to explore the Kubernetes World.

Persistent Volumes

Volumes Type:

• emptyDir: a simple empty directory used for storing transient data.

• hostPath: used for mounting directories from the worker node's filesystem into the pod.

• gitRepo: a volume initialized by checking out the contents of a Git Repository.

• nfs: an NFS share mounted into the pod.

• gcePersistentDisk: (Google Compute Engine Persistent Disk), awsElasticBlockStore (Amazon Web Services Elastic Block Store Volume), azureDisk (Azure Disk Volume) used for mounting cloud provide-specific storage.

• cinder, cephfs, iscsi, flocker, glusterfs, quobyte, rbd, flexVolume, vsphereVolume, photonPersistentDisk, scalaIO: used for mounting other types of network storage.

• configMap, secrets, downwardAPI: special types of volumes used to expose certain kubernetes resources and cluster information to the pod.

• persistentVolumeClaim: a way to use pre- or dynamically provisioned persistent storage.

gitRepo: Using Git Repo as the starting point for a volume:

gitRepo: repository: https://... revision: masater # which branch directory: . # whether to clone the project in a new folder or in the root folder.

PersistentVolume:

PersistentVolumes don;t belong to any namespace, they are cluster-level resources like nodes.

StatefulSets:

• provide a stable network identity: each pod created by a StatefulSet is assigned an ordinal index (zero-based), which is then used to derive the pod's and hostname, and to attach stable storage to the pod.