Azure Classroomnotes 09/Jul/2023

Azure Networking Workshop

Goal

• Lets try to create a multi – region active passive network with application deployed
  
• For all the network configuration, lets use Azure CLI
• For vm and traffic manager we will be using Azure portal
• Ideally every thing should be created from infra provisioning tools like ARM Templates, Terraform or Azure Bicep

Azure CLI

• Refer Here for installation
• Azure cli helps us in interacting with azure over CLI
• Azure CLI will have commands in the following form

az section [sub-section] action [--arg1 value1] .. [--argn valuen]

• Azure CLI Docs Refer Here
• Find a commands to
  • create a resource group
  • Create a vnet in that resource group
  • Create a subnet in vnet created above
  • Create a load balancer
• Ensure Azure CLI Tools Extension is installed in Visual Studio Code
• Azure CLI to create a resource group and vnet with one subnet

# Create a resource group
az group create `
    --location 'eastus' `
    --name 'workshop' `
    --tags Purpose=learning Environment=Dev

# Create a virtual network with cidr range 10.0.0.0/16 with name 
# ntier-primary with location east us
az network vnet create `
    --location 'eastus' `
    --resource-group 'workshop' `
    --address-prefixes '10.0.0.0/16' `
    --name 'ntier-primary'


# Add one subnet to ntier-primary called as app subnet with 
# cidr range 10.0.0.0/24
az network vnet subnet create `
    --name 'app' `
    --resource-group 'workshop' `
    --vnet-name 'ntier-primary' `
    --address-prefixes '10.0.0.0/24'

• Lets try to create something reusable Refer Here for the changes done to make the script reusable

#!/bin/bash

resource_group_name='workshop1'
primary_vnet_name='ntier-primary'
secondary_vnet_name='ntier-secondary'
primary_location='eastus'
secondary_location='westus'
subnet_name='app'
primary_vnet_cidr='10.0.0.0/16'
secondary_vnet_cidr='10.1.0.0/16'
primary_subnet_cidr='10.0.0.0/24'
secondary_subnet_cidr='10.1.0.0/24'

function create_network_with_subnet() {
    location=$1
    resource_group_name=$2
    vnet_cidr=$3
    vnet_name=$4
    subnet_name=$5
    subnet_cidr=$6

    az network vnet create \
        --location $location \
        --resource-group $resource_group_name \
        --address-prefixes $vnet_cidr \
        --name $vnet_name

    az network vnet subnet create \
        --name $subnet_name \
        --resource-group $resource_group_name \
        --vnet-name $vnet_name \
        --address-prefixes $subnet_cidr

}

# Creates a resource group if it does not exist

if [ $(az group exists --name $resource_group_name) = false ]; then 
   az group create \
    --name $resource_group_name \
    --location $primary_location

    # create a virtual network in primary region
    create_network_with_subnet $primary_location $resource_group_name $primary_vnet_cidr $primary_vnet_name $subnet_name $primary_subnet_cidr

    # Create a virtual network in secondary region
    create_network_with_subnet $secondary_location $resource_group_name $secondary_vnet_cidr $secondary_vnet_name $subnet_name $secondary_subnet_cidr

else
   echo "$resource_group_name already exists"
fi

• Now lets create two vms in primary region and install any application spring petclinic
• and repeat the same in secondary region
• Note spring petclinic installation on ubuntu

sudo apt upate
sudo apt install openjdk-11-jdk -y
cd /tmp
wget https://referenceapplicationskhaja.s3.us-west-2.amazonaws.com/spring-petclinic-2.4.2.jar
java -jar /tmp/spring-petclinic-2.4.2.jar

• Refer Here for load balancer cli
• To make active passive using priority routing method Refer Here