Amazon Web Services (AWS) provides an Application Load Balancer (ALB) that allows you to distribute incoming application traffic across multiple targets, such as Amazon EC2 instances and containers. One of the powerful features of ALB is path-based routing, which allows you to route traffic to different target groups based on the URL path of the incoming request. In this guide, we will walk through the steps to configure path-based routing in an AWS Application Load Balancer.

Step 1: Log in to AWS Management Console

Start by logging into your AWS Management Console and navigate to the EC2 Dashboard. From the left-hand menu, select Load Balancers.

Step 2: Create an Application Load Balancer

If you haven't already created an ALB, click on Create Load Balancer and choose Application Load Balancer. Configure the basic settings such as:

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

Step 3: Define Target Groups

Create target groups for the services you want to route traffic to. Click on Target Groups in the left-hand menu, then click on Create Target Group. Configure each target group, 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 Path-Based Routing Rules

To set up path-based routing, click on View/edit rules for the listener you just created:

• Click on + Add rule.
• Select Path as the condition.
• Enter the URL path you want to route (e.g., /api/* for all API requests).
• For the action, select the target group that should handle the requests matching that path.

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

Step 6: Review and Save Your Configuration

Once you have set up your path-based 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 paths you set up in your routing rules. Ensure that the requests are being routed to the correct target groups based on the URL path.

Conclusion

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

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