Amazon Web Services (AWS) provides a robust and flexible Application Load Balancer (ALB) that allows you to distribute incoming application traffic across multiple targets, such as Amazon EC2 instances, containers, and IP addresses. One of the powerful features of ALB is Host-Based Routing, which allows you to route traffic to different target groups based on the host field of the HTTP request.

Step 1: Log into AWS Management Console

Begin by logging into your AWS Management Console. Navigate to the EC2 Dashboard and select Load Balancers from the left-hand menu.

Step 2: Create an Application Load Balancer

If you haven't created an ALB yet, you can do so by clicking on Create Load Balancer, then select Application Load Balancer. Follow the prompts to configure the load balancer:

• Select the appropriate scheme (Internet-facing or Internal).
• Choose at least two subnets in different Availability Zones.
• Configure security groups for your load balancer.

Step 3: Define Target Groups

After creating the ALB, you need to define the target groups that will receive the traffic. Click on Target Groups in the left-hand menu and then click on Create Target Group. Configure the target group settings, including:

• Target Type (e.g., instance, IP address).
• Name of the target group.
• Health check settings.

Step 4: Create Listeners

Once your target groups are set up, go back to your load balancer's configuration. Click on the Listeners tab and then Add Listener. Choose the protocol (HTTP/HTTPS) and port (e.g., 80 for HTTP).

Step 5: Configure Rules for Host-Based Routing

After adding a listener, configure rules to enable host-based routing:

• Click on View/edit rules for the listener you just created.
• Click on + Add rule.
• Select Host header as the condition and enter the domain name (e.g., example.com).
• For the action, select the target group that you want to route traffic to.

Repeat this step to add additional rules for other hostnames and target groups as needed.

Step 6: Review and Save Your Configuration

Once you have set up your routing rules, review your configuration to ensure everything is correct, and then save the changes.

Step 7: Test Your Load Balancer

To test your configuration, make requests to the domain names you set up in your routing rules. Ensure that the requests are being routed to the correct target groups based on the hostname.

Conclusion

You have successfully configured host-based routing on your AWS Application Load Balancer. This feature allows you to efficiently manage traffic for different applications hosted on the same load balancer.

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