DevOps Classroomnotes 06/Sep/2023

Kubernetes contd

Understand K8s resources from 10,000 feet

• Pod: Pod is atomic unit of creation in k8s and it contains container(s). Each Pod has unique ip address
  
• Label: This is name/value pair used to query resources in k8s. used in services, replicasets, deployments etc…
• Controllers
  • Replication Controller or Replica Set: They maintain a state of number of replicas of pods
    
  • Deployment: This enables performing zero downtime deployments with features to rollout a new version and undo rollout
    
• Horizontal Pod AutoScaler: Allows us to autoscale pods based on some metrics like cpu, network etc…

Kubernetes Installation Options

• Single Machine (Developer Setups)
  • minikube
  • kind
• Self Hosted K8s (On-premises)
  • kubeadm
  • kubespray
• Managed K8s (Kubernetes as a Service)
  • Azure Kuberentes Services (AKS)
  • Elastic Kubernetes Services (EKS)
  • Google Kubernetes Engine (GKE)
• For other options Refer Here for turnkey

Our Playgrounds

• kubeadm
• AKS
• EKS

Kube-adm installation Labsetup

• Overview
  

Kuberentes no longer supports docker (What does that mean)

• Refer Here for more info
• This means in in-house installation you need install an extra CRI like (cri-o) on every node.