Managed Kubernetes clusters

• Cloud providers offer managed kubernetes clusters
• Cloud providers manage the control plane i.e. we need not install k8s and the control plane will be a black box
  

---

Azure Kubernetes Services (AKS)

• AKS is managed k8s offered by Azure Refer Here
• Lets setup AKS Cluster
• Pre-reqs:
  • Azure CLI is installed and configured
• Refer Here for steps
• Azure cli user data

#!/bin/bash
sudo apt-get update
sudo apt-get install apt-transport-https ca-certificates curl gnupg lsb-release -y
sudo mkdir -p /etc/apt/keyrings
curl -sLS https://packages.microsoft.com/keys/microsoft.asc |
  gpg --dearmor | sudo tee /etc/apt/keyrings/microsoft.gpg > /dev/null
sudo chmod go+r /etc/apt/keyrings/microsoft.gpg
AZ_DIST=$(lsb_release -cs)
echo "Types: deb
URIs: https://packages.microsoft.com/repos/azure-cli/
Suites: ${AZ_DIST}
Components: main
Architectures: $(dpkg --print-architecture)
Signed-by: /etc/apt/keyrings/microsoft.gpg" | sudo tee /etc/apt/sources.list.d/azure-cli.sources
sudo apt-get update
sudo apt-get install azure-cli -y

• Commands to create AKS cluster from bash (linux/mac)

# variables 
export MY_RESOURCE_GROUP_NAME="myAKSResourceGroup"
export REGION="eastus"
export MY_AKS_CLUSTER_NAME="myAKSCluster"
export MY_DNS_LABEL="mydnslabel"
# Create a resource group
az group create --name $MY_RESOURCE_GROUP_NAME --location $REGION
az aks create --resource-group $MY_RESOURCE_GROUP_NAME --name $MY_AKS_CLUSTER_NAME --node-count 1 --node-vm-size "Standard_B2ms" --generate-ssh-keys
# install kubectl
az aks install-cli 
# get kube config
az aks get-credentials --resource-group $MY_RESOURCE_GROUP_NAME --name $MY_AKS_CLUSTER_NAME

• Commands to create AKS cluster from powershell using Azure CLI

$MY_RESOURCE_GROUP_NAME="myAKSResourceGroup"
$REGION="eastus"
$MY_AKS_CLUSTER_NAME="myAKSCluster"
$MY_DNS_LABEL="mydnslabel"
az group create --name $MY_RESOURCE_GROUP_NAME --location $REGION
az aks create --resource-group $MY_RESOURCE_GROUP_NAME --name $MY_AKS_CLUSTER_NAME --node-count 1 --node-vm-size "Standard_B2ms" --generate-ssh-keys
az aks install-cli 
az aks get-credentials --resource-group $MY_RESOURCE_GROUP_NAME --name $MY_AKS_CLUSTER_NAME

Lets deploy spc using replicaset and a service of type load balancer

• Refer Here for changes
  
  

---

Library Application

• Architecture
  
• Technical stack
  • users-service: REST API
    • python
    • fast api
  • user-db:
    • postgres
  • books-service: REST API
    • python
    • fast api
  • user-db:
    • postgres
  • library-frontend:
    • react js
• To run books database
  • image: postgres:15-alpine
  • environmental variables:
    • POSTGRES_USER: user
    • POSTGRES_PASSWORD: password
    • POSTGRES_DB: booksdb
  • port: 5432
• To run books service
  • image: shaikkhajaibrahim/libbookssvc:1.0
  • environmental variables:
    • DATABASE_URL: “postgresql://:@:5432/“
    • SECRET_KEY: ‘YtDEVWnL35aAIP-5yxeLjAZ49R920-mMNDfwPyWULu63HFsYzo0f-LO2InxC8eu428k’
  • port: 8000
• To run user database
  • image: postgres:15-alpine
  • environmental variables:
    • POSTGRES_USER: user
    • POSTGRES_PASSWORD: password
    • POSTGRES_DB: usersdb
  • port: 5432
• To run users servics:
  • image: shaikkhajaibrahim/libuserssvc:1.0
  • environmental variables:
    • DATABASE_URL: “postgresql://:@:5432/“
    • SECRET_KEY: ‘YtDEVWnL35aAIP-5yxeLjAZ49R920-mMNDfwPyWULu63HFsYzo0f-LO2InxC8eu428k’
  • port: 8000
• To run library webstore
  • image: shaikkhajaibrahim/libwebstore:1.0
  • environmental variables
    • REACT_APP_BACKEND_API_URL: http://:8000/api/v1
    • REACT_APP_BOOKS_API_URL: http://:8000/api/v1/books
    • REACT_APP_USERS_API_URL: http://:8000/api/v1/users
  • port: 3000
    

---

First Version of Library:

• Lets create a users database replicaset
• Lets create a books database replicaset
  
• Refer Here for the changes done
• Now lets create rs for users service and books service Refer Here for changes
  
• Lets add rs and service for library store Refer Here for changes
• To create a admin user run this from any container

curl -X 'POST' \
  'http://users-svc:8000/api/v1/users/' \
  -H 'accept: application/json' \
  -H 'Content-Type: application/json' \
  -d '{
  "username": "qtdevops",
  "email": "admin@admin.com",
  "user_type": "administrator",
  "password": "admin@123"
}'