DevOps Classroom notes 12/Jul/2025

Phippy Goes to the Zoo

• Refer Here and Refer Here for pdf version

Managed Kubernetes

• Managed K8s is k8s offered as a service by cloud providers.
• Azure offers AKS (Azure kubernetes service) & AWS offer EKS
• Managed K8s means
  • control plane is managed by cloud
• Managed k8s offers
  • load balancers to integrate with k8s
  • storage services for persistence
  • managing secrets effectively with vaults
  • easy adminstration.

Lets create an AKS Cluster

• Ensure Azure CLI is installed and connected to your subscription

az login

• Install kubectl
• creating k8s cluster in azure
• Create the following variables
• linux or mac

export MY_RESOURCE_GROUP_NAME="myAKSResourceGroup"
export REGION="eastus"
export MY_AKS_CLUSTER_NAME="myAKSCluster"
export MY_DNS_LABEL="mydnslabel"

• Windows Terminal

$MY_RESOURCE_GROUP_NAME="myAKSResourceGroup"
$REGION="eastus"
$MY_AKS_CLUSTER_NAME="myAKSCluster"
$MY_DNS_LABEL="mydnslabel"

• Create a resource group

az group create --name $MY_RESOURCE_GROUP_NAME --location $REGION

• Create an AKS Cluster

az aks create --resource-group $MY_RESOURCE_GROUP_NAME --name $MY_AKS_CLUSTER_NAME --node-count 1 --generate-ssh-keys --node-vm-size "Standard_B2ms"

Service

• Refer Here for official docs
• A Service when created gets an virtual ip address which is fixed.
• A service is made of endpoints, Endpoint is a pod with ip on a specific port
• service types
  • ClusterIP: This is default type of k8s service which is internal within cluster.
  • Node Port: Expose the application via a port on the node
  • Load Balancer: Exposes the application via load balancer (Used in managed k8s clusters)
  • ExternalName: Services of type ExternalName map a Service to a DNS name
• A service with in k8s cluster can be accessed by name or ip.
• Name resolution of service works in this fashion
• A fqdn of service is generally <svc-name>.<namespace>.svc.cluster.local

nginx-internal.default.svc.cluster.local

• Refer Here for different manifests and classroom video for
  • exploring nslookups
  • different types of services with examples.

Deployments

• Refer Here for official docs
• k8s has two types of stragies for deployment
  • RollingUpdate: This is default which ensures by default only 25% of your workload updates happen
  • Recreate
• K8s Deployments have options to undo rollout or go back to previous versions & this is supported by Daemonsets & stateful sets as well
• Lets discuss this in our next session
  • health checks
  • deployments
  • job/cronjob
  • config maps
  • secrets