🌐 Application Gateway in Azure

This lab demonstrates the steps to set up an Azure Application Gateway, including the creation of necessary resources and configuration of a backend web server.

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🧱 Prerequisites

• An active Azure subscription
• Basic understanding of Azure networking components

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🔹 Step 1: Create a Resource Group

1. Navigate to the Azure Portal.
2. Search for Resource groups and click + Create.
3. Fill in the required details:
   • Subscription: Select your subscription.
   • Resource Group: Enter a name (e.g., AppGatewayRG).
   • Region: Choose a region (e.g., East US).
4. Click Review + Create, then Create.

📷 *Refer to Screenshot:

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🔹 Step 2: Create a Virtual Network and Subnets

1. In the Azure Portal, search for Virtual networks and click + Create.
2. Fill in the required details:
   • Name: Enter a name (e.g., AppGatewayVNet).
   • Address space: Define the address space (e.g., 10.0.0.0/16).
3. Under Subnets, create two subnets:
   • AppGatewaySubnet: e.g., 10.0.1.0/24
   • BackendSubnet: e.g., 10.0.2.0/24
4. Click Review + Create, then Create.

📷 *Refer to Screenshot:

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🔹 Step 3: Create a Virtual Machine

1. Navigate to Virtual machines and click + Create.
2. Fill in the required details:
   • Name: Enter a name (e.g., BackendVM).
   • Region: Same as the Resource Group.
   • Image: Choose a Linux distribution (e.g., CentOS).
   • Size: Select an appropriate size.
   • Authentication type: Choose SSH public key or password.
   • Inbound port rules: Allow HTTP (80) and SSH (22).
3. Under Networking, place the VM in the BackendSubnet of AppGatewayVNet.
4. Click Review + Create, then Create.

📷 *Refer to Screenshot:

After creating the VM, we need to follow the below steps :

1. Login to the VM and sudo to root.
2. Install and Enable httpd service in VM.
3. Create an index file (/var/www/html/index.html)
4. Enable firewalld service in VM.
5. Add port 80 in firewall.

Ensure that index.html is accessible on web

Create a Public IP Address

Create a Public IP for the Application Gateway.

Create Application Gateway

Now we have have to create the Application Gateway , Fill the Basic Part.

In the Frontends section, select the Public IP

In the Backends section, Click on Add a Backend Pool

Fill the below details and click on Add

Now we can see the backend pool is Added.

Click on Next, In the Configuration section, we will connect the frontends and backend pools

Click on Add a routing role, Now In Listener section, fill the below details ,

And in Backend Targets section, select the Backend Target and for Backend Settings, click on Add new

Fill the below details in Backend settings,

Now we have added both the Listener and Backend Targets, Click on Add.

Now the Routing rule is added.

Click on Next , Review and Create.

It will take 5 mins to get created, after that we can see the Application Gateway is created,

Check the Backend Health of the Application Gateway to ensure it is Healthy

Copy the Public IP of Application Gateway - http://52.226.176.40/

Try to open the link - http://52.226.176.40/index.html