Kubernetes (k8s)

• k8s is a platform that is used with huge number of services & capabilities that keeps growing.
• The core functionality of k8s is schedule workloads in containers across your infra. In addition to this there are many functionalities that k8s brings in
  • Managing storage systems
  • Secret Management
  • Application health & readiness check
  • Replicating application instances
  • Horizontal pod Autoscaling
  • Cluster Autoscaling
  • Naming & Service Discovery
  • Balancing loads
  • Rolling updates
  • Resource Monitoring
  • Log Management
  • Application debugging
  • Authentication & Authorization
• Refer Here for k8s introduction

Container Orchestration

• Primary responsibility of k8s is container orchestration.
• It means
  • making sure that all the containers that execute various workloads are scheduled on physical or virtual machines.
  • Keep an eye on all running containers & replace dead, unresponsive or unhealthy containers with new containers.
• In k8s we embrace cattle mindset over pets

k8s components

• Refer Here for master and node components
• Cluster:
  • It is collection of hosts(nodes) that provide compute, memory, storage and networking resources
  • k8s uses these resources to run application workloads.
• Master Node:
  • The master node is a single host in k8s cluster.
  • This can be a physical server or virtual machine
  • This is the control plane of k8s. This master is responisble for assigning work (container workloads) to be scheduled on nodes
• Nodes:
  • It is a single host in k8s cluster
  • This can be physical server or virtual machine
  • These are managed by k8s master and they do the work of executing workloads in k8s (They were referred as minions)
  • Node is responsible for doing the work assigned.

K8s architecture

Exercises

• Refer Here to learn about json and yaml
• Ensure you have cloud account (aws,azure)