Kubernetes Architecture

• Refer Here for introduction to k8s
  
• We express our desired state in yaml or imperative command and use a client (kubectl) to communicate with k8s and k8s does the rest
  
• For master and node components Refer Here

Ways to setup Kubernetes

• Single System (Developer): This is workstation environment for developmental purposes, Here we have following major options
  • minikube
  • kind
• Self Hosted
  • kubeadm
  • kubespray (install k8s using ansible )
• Cloud Hosted
  • AWS: Elastic Kubernetes Services (EKS)
  • Azure: Azure Kuberenetes Services (AKS)
  • GCP: Google Kubernetes Engine (GKE)

Kubernetes stopped supporting docker

• kubernetes uses a interface called as CRI (Container Runtime Interface)
• kubernetes used to ship dockershim to interact with docker containers
• In K8s release 1.21 dockershim was removed Refer Here
• Mirantis and many other communties have developed CRI for docker Refer Here

Kubernetes workloads

• Pod
• ReplicaSet/ReplicationController
• Deployment
• DaemonSet
• StatefulSet
• Service
• Ingress
• Labels
• Namespaces
• …

Pod

• This is the smallest unit of creation by k8s
• A Pod has one or more containers in it
• Every Pod gets a unique ipaddress