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Enmanuel Jarquรญn
Enmanuel Jarquรญn

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Introduction to Kubernetes (notes 1).

Course:
https://cloudacademy.com/course/introduction-to-kubernetes/introduction/?context_id=92&context_resource=lp

Kubernetes is a container orchestration tool.

  • Clusters: refers to all of the machines collectively and can be thought of as the entire running system.
  • Nodes are the machines in the cluster.
  • Nodes are categorized as workers or masters
  • Worker nodes include software to run containers managed by the Kubernetes control plane.
  • Master nodes run the control plane
  • The control plane is a set of APIs and software that Kubernetes users interact with.
  • The APIs and software are referred to as master components

Scheduling:

  • Control plane schedules containers onto nodes.
  • Scheduling decisions consider required CPU and other factors.
  • Scheduling refers to the decision process of placing containers onto nodes.

Kubernets Pods:
**- Containers are grouped onto pods.

  • Pods can include one or more containers.
  • All containers in a pod run on the same node.
  • Pods are the smallest building block in Kubernetes

Services:

  • Services define networking rules for exposing groups of Pods

    • To other pods
    • To the public Internet
  • Use labels to select a group of Pods.

  • Service has a fixed IP address.

  • Distribute requests across Pods in the group.

Kubernetes Deployments:
Manage deploying configuration changes to running Pods.

Pods:

  • Pods are Kubernetes' basic building block
  • Declare Pods and other resources in manifest files
  • metadata includes name and labels
  • Pod spec include container names, images
  • Containers communicate over localhost within a Pod
  • kubectl logs
  • logs record what's written to standard output and standard error

  • Horizontal scaling.

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