Step 6: Create a Load Balancer
Create a Load Balancer to expose the native Docker Service
Now that your DuploCloud Service is running, you have a mechanism to expose the containers and images in which your application resides. But because your containers are running inside a private network, you also need a load balancer to listen on the correct ports in order to access the application.
In this step, we add a Load Balancer Listener to complete this network configuration.
Estimated time to complete Step 6: 15 minutes.
Prerequisites
Before creating a Service, verify that you accomplished the tasks in the previous tutorial steps. Using the DuploCloud Portal, confirm that:
An Infrastructure and Plan exist, both with the name NONPROD.
A Tenant with the name dev01 has been created.
An EC2 Host with the name host01 has been created.
A Service with the name demo-service-d01 has been created.
Select the Tenant you created
In the Tenant list box, on the upper-left side of the DuploCloud Portal, select the dev01 Tenant that you created.
Creating a Load Balancer using Native Docker
In the DuploCloud Portal, navigate to Docker -> Services.
Select the Service demo-service-d01 that you created.
Click the Load Balancers tab.
Click the Configure Load Balancer link. The Add Load Balancer Listener pane displays.
From the Select Type list box, select Application LB.
In the Container Port field, enter 3000, the port on which the application running inside the container image (duplocloud/nodejs-hello:latest) is running.
In the External Port field, enter 80.
From the Visibility list box, select Public.
From the Application list box, select Docker Mode.
In the Health Check field, enter /, indicating that you want the Kubernetes Health Check logs written to the root directory.
From the Backend Protocol list box, select HTTP.
Click Add.
When the LB Status card displays Ready, your Load Balancer is running and ready for use.
Securing the Load Balancer
If you want to secure the load balancer created, you can follow the steps specified here.
Creating a Custom DNS Name
You can modify the DNS name by clicking Edit in the DNS Name card in the Load Balancers tab. For additional information see this page.
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