Load Balancers

Add and configure Load Balancers with DuploCloud Azure

Load Balancers are essential when running a service. They expose the containers and images in which your application resides. When your containers are run inside a private network, you need a load balancer to listen on the correct ports to access the application.

Creating an AKS Ingress

If you need to create an Ingress Load Balancer, refer to the AKS Ingress page in the DuploCloud Kubernetes User Guide.

DuploCloud allows no more than one (0 or 1) Load Balancer per DuploCloud Service.

Adding a Load Balancer

Add a Load Balancer listener that uses the Kubernetes NodePort (K8S NodePort).

Several Load Balancers are available for Azure. See the Azure Documentation for a comparison of each option.

• Application LB (Standard load balancer)

• Shared App Gateway

• Classic (Basic load balancer)

• Health Check - Selecting this load balancer allows the Application LB (Standard load balancer) to use Kubernetes Health Check to determine whether your service is running properly.

Prerequisites

You must create Services before adding load balancers and listeners. In this example, we name these services s1-alb and s4-nlb, respectively.

Services running ALB and NLB

Adding a Load Balancer Listener

1. In the DuploCloud Portal, navigate Kubernetes -> Services.

2. On the Services page, select the Service name in the Name column.

3. Click the Load Balancers tab.

4. Click Configure Load Balancer. The Add Load Balancer Listener pane appears.

   

   The Load Balancer tab on the Kubernetes Services page
5. Select a type (such as K8S Node Port) in the Select Type field.

6. Add the Kubernetes Health Check URL for this container in the Health Check field.

7. Complete the other fields in the Add Load Balancer Listener and click Add.

Configuring a Load Balancer using rules

Rules specify specific configurations for various types of Load Balancers.

See the Ingress use case for an example of how to configure Load Balancers using rules.

Restricting Open Access to Public Load Balancers

Restrict open access to your public Load Balancers by enforcing controlled access policies.

1. From the DuploCloud Portal, navigate to Administrator -> System Settings.

2. Select the System Config tab, and click Add. The Add Config pane displays.

The Add Config pane in the DuploCloud Portal

1. From the Config Type list box, select Flags.

2. From the Key list box, select Deny Open Access To Public LB.

3. In the Value list box, select True.

4. Click Submit. Open access to public Load Balancers is restricted.