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Kubernetes in DevOps

Overview :
  • To work with Kubernetes, you use Kubernetes API object to describe your cluster's desired state.
  • You set your desired state by creating objects using the Kubernetes API, typically via the command-line interface, kubectl.
  • You can also use the Kubernetes API directly to interact with the cluster and set or modify your desired state.
  • Once you've set your desired state, the Kubernetes Control Plane works to make the cluster's state match the desired state.
  • To do so, Kubernetes performs a variety of tasks automatically-such as starting or restarting containers, scaling the number of replicas of a given application, and more.
  • The Kubernetes Control Plane consists of a collection of processes running on your cluster.
  • The Kubernetes Control Plane consists of a collection of process running on your cluster:
  • The Kubernetes Master: It is a collection of three processes that run on a single node in your cluster, which is designated as the master node.
  • Those processes are: kube-apiserve, kube-controller-manager and kube-scheduler.
  • Each individual non-master node in your cluster runs two processes:
  • kubelet, which communicates with the Kubernetes Master.
  • kube-proxy, a network proxy which reflects Kubernetes networking services on each node.

Kubernetes Objects :

Kubernetes Objects are persistent entities in the Kubernetes system.

Kubernetes uses these entities to represent the state of your cluster. Specifically, they can describe:
  • What containerized application are running (and on which nodes)
  • The resources available to those application
  • The policies around how those applications behave, such as restart policies, upgrades, and fault-tolerance
The basic Kubernetes objects include:
  • Pod
  • Service
  • Volume
  • Namespace
In addition, Kubernetes contains a number of higher-level abstractions called Controllers. Controllers build upon the basic objects, and provide additional functionality and convenience features. They include:
  • ReplicaSet
  • Deployment
  • StatefulSet
  • DaemonSet
  • DaemonSet
  • Job

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