Kubernetes Crash Course

Everything You Need to Know in One Hour

Introduction to Kubernetes

  • Kubernetes is an open source container orchestration framework
  • It helps manage applications made up of hundreds or thousands of containers
  • Kubernetes offers high availability, scalability, and disaster recovery
  • It is necessary for managing microservices and container-based applications

Kubernetes Architecture

  • Kubernetes clusters have at least one master node and multiple worker nodes
  • Master nodes run essential processes like API server and controller manager
  • Worker nodes run containers and execute tasks assigned by the master node
  • An etcd key-value storage holds the current state of the cluster

Main Kubernetes Components

  • Pods: The smallest unit of Kubernetes, encapsulates one or more containers
  • Services: Provide network access to pods and load balancing
  • ConfigMap: Stores external configuration data for applications
  • Secret: Securely stores sensitive data like credentials
  • Volumes: Persistently stores data for stateful applications
  • Deployments: Define the desired state for pods and enable scaling
  • StatefulSets: Manage stateful applications like databases

Creating a Kubernetes Cluster with MiniKube

  • MiniKube allows for local Kubernetes cluster setup
  • Install MiniKube and start the cluster using Docker as the driver
  • Use Kubectl (Kube Control) to interact with the cluster
  • MiniKube provides a single-node cluster for testing and development purposes

Deploying Applications in a Kubernetes Cluster

  • Create configuration files for MongoDB, including ConfigMap and Secret
  • Define deployments for MongoDB and web application
  • Services provide external access to the deployed applications
  • Use Kubectl apply command to deploy the configurations

Conclusion and Next Steps

  • Kubernetes is a powerful container orchestration tool
  • The crash course helps beginners get started with Kubernetes
  • Further learning opportunities and certifications are available
  • Kubernetes offers scalability, high availability, and disaster recovery