Supporting additional AWS services with AWS ALB (Application Load Balancer)

The default Porter-managed Kubernetes cluster on AWS uses a Network Load Balancer (NLB) which forwards traffic to an on-cluster Nginx Ingress Controller. Whilst this provides the best performance, some users have extra requirements which require an ALB such as:

• allowlisting specific IP ranges for applications deployed on Porter
• integrating with other AWS tools such as AWS WAFv2
• using AWS ACM certificates

As an enterprise feature, Porter supports switching out the default NLB for an Application Load Balancer (ALB).

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Requirements

• A Porter-managed Kubernetes cluster
• Access to your DNS provider. For this example, we will use CloudFlare, but Route53 is also supported.
• A domain name which can be wildcarded. For this example, we will use stefan-2.porter.run
  • Using a wildcard domain is strongly recommended as you can then create multiple applications which are exposed to internet through Porter, without any further changes in future

If the following options are not available to you, please reach out to Porter using the chatbot on the dashboard for more information

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DNS Validation

Skip this step if you are using Route53, as Porter can perform the validation on your behalf.

When your ALB is up and running, you will have to ensure that your new AWS Certificate Manager (ACM) Certificate is validated. AWS does this by creating a CNAME record which must resolve to an automatically generated value.

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AWS Certificate Manager - CNAME

1. In your AWS console, navigate to the region that your cluster was deployed in. You can find this from your Porter dashboard in the Infrastructure section, in the Configuration tab.

2. After selecting the correct region, search for AWS Certificate Manager in the AWS Console search bar.

3. Select List Certificates from the bar on the left.

4. Find the domain name which matches the domain that you provided to Porter, then click on the Certificate ID.

5. The status for this certificate should be Pending validation.

6. Scroll down to Domains.

7. Take note of the CNAME name and CNAME value.

   • You may see multiple domains here, all with the same CNAME name and CNAME value. No need to worry about these.

8. Go to your DNS provider. This will be CloudFlare in our case.

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CloudFlare

1. Select DNS then Records.

2. Create a new record - Select CNAME for type.

   • Enter the value that you pulled from AWS for CNAME name in the Name field in CloudFlare.
   • Enter the value that you pulled from AWS for CNAME value in the Target field in CloudFlare.
   • Ensure Proxy status is disabled, and is in DNS only mode.
   • Set TTL to Auto.
   • Enter Porter-managed ACM Certificate Verification for YOUR_DOMAIN in the Comment field. This is not required, but is strongly recommended.

3. Return to the AWS console.

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AWS Certificate Manager - Status

1. Go to the ACM Certificate and refresh the page.
2. If the status is still Pending Validation, wait 5 minutes then refresh again. You should now see that the status is Issued.
3. Your certificate is now issued, and can be used by your ALB.

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Creating a CNAME for your wildcard domain

As a reminder, we are using stefan-2.porter.run as the address that we provided to Porter. All of our protected applications will be available at *.stefan-2.porter.run for example myapp.stefan-2.porter.run or whoami.stefan-2.porter.run.

1. Go to your DNS provider. We will be using CloudFlare, but the settings should be similar in any DNS Provider. 1 Select DNS then Records.
2. Create a new record.
   • Select CNAME for type.
   • Enter the wildcarded domain in the Name field i.e. *.stefan-2.porter.run.
   • Enter the ALB domain name in Target field. This will be provided to you by the Porter engineer.
   • Ensure Proxy status is disabled, and is in DNS only mode.
   • Set TTL to Auto.
3. You can now use this as a custom domain in Porter for your applications. See Deploying on the Custom Domain to setup your new domain to be compatible with Porter.