Introduction to Kubernetes.pdf

Introduction to Kubernetes.pdf

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  Introduction to Kubernetes ●Kubernetes is an open-source platform for automating the deployment, scaling, and management of containerized applications. It was originally developed by Google and is now maintained by the Cloud Native Computing Foundation (CNCF). ● Kubernetes provides a way to define and run containerized applications in a cluster of machines, abstracting away the underlying infrastructure and providing a consistent interface for scaling, deploying, and monitoring applications. ● It also provides features such as automatic self-healing, service discovery and load balancing, and automatic storage provisioning. ● Kubernetes has become the de facto standard for managing containerized applications in production environments and is supported by all major cloud providers. ● Kubernetes solves a number of problems that arise when deploying, scaling, and managing containerized applications in production environments. Some of these problems include:
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  1) Managing thecomplexity of deploying and scaling containerized applications across a cluster of machines. 2) Automatically ensuring that the desired number of replicas of a service are running at any given time, and rescheduling them if they fail. 3) Providing automatic service discovery and load balancing for microservices. 4)Automatic self-healing of containers and services that fail. 5) Managing the storage resources used by containers and allowing them to dynamically provision storage when needed. 6) Allowing rolling updates of the application and rollbacks in case of failures. 7) By providing a consistent and automated way to manage containerized applications, Kubernetes allows developers to focus on writing code, and operations teams to focus on maintaining the underlying infrastructure. 8) It also allows companies to scale their applications horizontally, by adding more machines to the cluster, rather than vertically, by adding more resources to individual machines. A few Kubernetes commands: 1. kubectl apply - Apply a configuration to a resource by filename or stdin 2. kubectl attach - Attach to a running container
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  3. kubectl auth- Inspect authorization 4. kubectl config - Modify kubeconfig files 5. kubectl create - Create a resource by filename or stdin 6. kubectl delete - Delete resources by filenames, stdin, resources and names, or by resources and label selector 7. kubectl describe - Show details of a specific resource or group of resources 8. kubectl exec - Execute a command in a container 9. kubectl get - List resources 10. kubectl label - Update the labels on a resource 11. kubectl logs - Print the logs for a container in a pod 12. kubectl patch - Update field(s) of a resource using strategic merge patch 13. kubectl port-forward - Forward one or more local ports to a pod 14. kubectl proxy - Run a proxy to the Kubernetes API server 15. kubectl replace - Replace a resource by filename or stdin 16. kubectl rollout - Roll out a deployment 17. kubectl scale - Set a new size for a Deployment, ReplicaSet, or Replication Controller 18. kubectl top - Show metrics for a given resource (by default, pods) Checkout more on Kubernetes Kubernetes Resources