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Route traffic for high availability of applications using Azure CLI

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This script creates a resource group, two app service plans, two web apps, a traffic manager profile, and two traffic manager endpoints. Traffic Manager directs traffic to the application in one region as the primary region, and to the secondary region when the application in the primary region is unavailable. Before executing the script, you must change the MyWebApp, MyWebAppL1 and MyWebAppL2 values to unique values across Azure. After running the script, you can access the app in the primary region with the URL mywebapp.trafficmanager.net.

If you don't have an Azure subscription, create an Azure free account before you begin.

Prerequisites

Sample script

Launch Azure Cloud Shell

The Azure Cloud Shell is a free interactive shell that you can use to run the steps in this article. It has common Azure tools preinstalled and configured to use with your account.

To open the Cloud Shell, just select Try it from the upper right corner of a code block. You can also launch Cloud Shell in a separate browser tab by going to https://shell.azure.com.

When Cloud Shell opens, verify that Bash is selected for your environment. Subsequent sessions will use Azure CLI in a Bash environment, Select Copy to copy the blocks of code, paste it into the Cloud Shell, and press Enter to run it.

Sign in to Azure

Cloud Shell is automatically authenticated under the initial account signed-in with. Use the following script to sign in using a different subscription, replacing <Subscription ID> with your Azure Subscription ID. If you don't have an Azure subscription, create an Azure free account before you begin.

subscription="<subscriptionId>" # add subscription here

az account set -s $subscription # ...or use 'az login'

For more information, see set active subscription or log in interactively

Run the script

# Route traffic for high availability of applications

# Variables for Traffic Manager resources
let "randomIdentifier=$RANDOM*$RANDOM"
location1="East US"
location2="West Europe"
resourceGroup1="msdocs-tm-rg1-$randomIdentifier"
resourceGroup2="msdocs-tm-rg2-$randomIdentifier"
tag="direct-traffic-for-increased-application-availability"
webApp="msdocs-webapp-tm-$randomIdentifier"
webAppL1="msdocs-tm-webapp-L1-$randomIdentifier"
webAppL2="msdocs-tm-webapp-L2-$randomIdentifier"
trafficManagerProfile="msdocs-traffic-manager-profile-$randomIdentifier"

# Create a resource group in location one
echo "Creating $resourceGroup1 in $location1..."
az group create --name $resourceGroup1 --location "$location1" --tags $tag

# Create a resource group in location two
echo "Creating $resourceGroup2 in $location2..."
az group create --name $resourceGroup2 --location "$location2" --tags $tag

# Create a website deployed from GitHub in both regions (replace with your own GitHub URL).
gitrepo="https://github.com/Azure-Samples/app-service-web-dotnet-get-started.git"

# Create a hosting plan and website and deploy it in location one (requires Standard 1 minimum SKU).
echo "Creating $webAppL1 app service plan"
az appservice plan create \
  --name $webAppL1 \
  --resource-group $resourceGroup1 \
  --sku S1

echo "Creating $webAppL1 web app"
az webapp create \
  --name $webAppL1 \
  --resource-group $resourceGroup1 \
  --plan $webAppL1

echo "Deploying $gitrepo to $webAppL1"
az webapp deployment source config \
  --name $webAppL1 \
  --resource-group $resourceGroup1 \
  --repo-url $gitrepo \
  --branch master \
  --manual-integration

# Create a hosting plan and website and deploy it in westus (requires Standard 1 minimum SKU).
echo "Creating $webAppL2 app service plan"
az appservice plan create \
  --name $webAppL2 \
  --resource-group $resourceGroup2 \
  --sku S1

echo "Creating $webAppL2 web app"
az webapp create \
  --name $webAppL2 \
  --resource-group $resourceGroup2 \
  --plan $webAppL2

echo "Deploying $gitrepo to $webAppL2"
az webapp deployment source config \
  --name $webAppL2 \
  --resource-group $resourceGroup2 \
  --repo-url $gitrepo \
  --branch master --manual-integration

# Create a Traffic Manager profile.
echo "Creating $trafficManagerProfile for $webApp"
az network traffic-manager profile create \
  --name $trafficManagerProfile \
  --resource-group $resourceGroup1 \
  --routing-method Priority \
  --unique-dns-name $webApp

# Create a traffic manager endpoint for the location one website deployment and set it as the priority target.
echo "Create traffic manager endpoint for $webAppL1"
l1Id=$(az webapp show \
  --resource-group $resourceGroup1 \
  --name $webAppL1 \
  --query id \
  --out tsv)
az network traffic-manager endpoint create \
  --name endPoint1 \
  --profile-name $trafficManagerProfile \
  --resource-group $resourceGroup1 \
  --type azureEndpoints \
  --priority 1 \
  --target-resource-id $l1Id

# Create a traffic manager endpoint for the location two website deployment and set it as the secondary target.
echo "Create traffic manager endpoint for $webAppL1"
l2Id=$(az webapp show \
  --resource-group $resourceGroup2 \
  --name $webAppL2 \
  --query id --out tsv)
az network traffic-manager endpoint create \
  --name endPoint2 \
  --profile-name $trafficManagerProfile \
  --resource-group $resourceGroup1 \
  --type azureEndpoints \
  --priority 2 \
  --target-resource-id $l2Id

Clean up resources

Use the following command to remove the resource group and all resources associated with it using the az group delete command - unless you have an ongoing need for these resources. Some of these resources may take a while to create, as well as to delete.

az group delete --name $resourceGroup1
az group delete --name $resourceGroup2

Sample reference

This script uses the following commands to create a resource group, web app, traffic manager profile, and all related resources. Each command in the table links to command specific documentation.

Command Notes
az group create Creates a resource group in which all resources are stored.
az appservice plan create Creates an App Service plan. This is like a server farm for your Azure web app.
az webapp web create Creates an Azure web app within the App Service plan.
az network traffic-manager profile create Creates an Azure Traffic Manager profile.
az network traffic-manager endpoint create Adds an endpoint to an Azure Traffic Manager Profile.

Next steps

For more information on the Azure CLI, see Azure CLI documentation.

Additional App Service CLI script samples can be found in the Azure Networking documentation.