Load Balancers

Creating Load Balancers for single and multiple DuploCloud Services

DuploCloud provides the ability to configure Load Balancers with the type of Application Load Balancer, Network Load Balancer, and Classic Load Balancer.

DuploCloud provides the ability to configure Load Balancers with the following types:

• Application Load Balancer - An ALB provides outbound connections to cluster nodes inside the EKS virtual network, translating the private IP address to a public IP address as part of its Outbound Pool.

• Network Load Balancer - An NLB distributes traffic across several servers by using the TCP/IP networking protocol. By combining two or more computers that are running applications into a single virtual cluster, NLB provides reliability and performance for web servers and other mission-critical servers.

• Classic Load Balancer - The legacy AWS Load Balancer (which was retired from AWS support, as of August 2022).

Load Balancers can be configured for Docker Native, EKS-Enabled, and ECS Services from the DuploCloud Portal. Using the Portal, you can configure:

• Service Load Balancers - Application Load Balancers specific to one service. (Navigate to Docker -> Services or Kubernetes -> Services, select a Service from the list, and click the Load Balancer tab).

• Shared and Global load balancers - Application or Network Load Balancers that can be used as a shared Load Balancer between Services and for Global Server Load Balancing (GSLB). (Navigate to Cloud Services -> Networking and select the Load Balancers tab).

DuploCloud allows one Load Balancer per DuploCloud Service. To share a load balancer between multiple Services, create a Service Load Balancer of type Target Group Only.

Adding a Load Balancer Listener

See the following pages for specific information on adding Load Balancer Listeners for:

• EKS Load Balancers

• ECS Service and Load Balancers

• Native Docker Load Balancers

Adding a Network Load Balancer (NLB) Listener with a custom CIDR

To specify a custom classless inter-domain routing (CIDR) value for an NLB Load Balancer, edit the Load Balancer Listener configuration in the DuploCloud Portal.

Before completing this task, you must add a Load Balancer Listener of Type Network LB.

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

2. Select the Service name from the NAME column.

3. Click the Load Balancers tab.

4. In the LB Listeners area, select the Edit Icon () for the NLB Load Balancer you want to edit. The Edit Load Balancer Listener pane displays.
5. Click Add in the Custom CIDR field of the Edit Load Balancer Listener pane.

6. Add the Custom CIDR(s) and press ENTER. In the example below 10.180.12.0/22 and 10.180.8.0/22 are added. After the CIDRs are added, you add Security Groups for Custom CIDR(s).

Edit Load Balancer Listener pane with Custom CIDRs

Adding Security Groups for NLBs with custom CIDRs

Repeat this procedure for each custom CIDR that you want to add.

1. Navigate to Administrator -> Infrastructure. The Infrastructure page displays.

2. From the Name column, select the appropriate Infrastructure.

3. Click the Security Group Rules tab.

4. Click Add to add a Security Group. The Add Tenant Security pane displays.

5. From the Source Type list box, select Ip Address.

6. From the IP CIDR list box, select Custom. A field labeled CIDR notation of allowed hosts displays.

7. In the CIDR Notation of allowed hosts field enter a custom CIDR and complete the other required fields.

8. Click Add to add the Security Group containing the custom CIDR.

Repeat this procedure to add additional CIDRs.

Add Tenant Security pane for adding Custom CIDRs to Securty Groups

Adding a Shared Load Balancer

1. In the DuploCloud Portal, navigate to Cloud Services -> Networking.

2. Click the Load Balancer tab.

3. Click Add. The Create a Load Balancer pane displays.

   

   Create a Load Balancer pane for a shared Application load balancer
4. In the Name field, enter a name for the Load Balancer.

5. From the Type list box, select a Load Balancer type.

6. From the Visibility list box, select Public or Internal.

7. Click Create.

Creating a Target Group Only Load Balancer for multiple services

Instead of creating a unique Load Balancer for each Service you create, you can share a single Load Balancer between multiple Services. This is helpful when your applications run distributed microservices where the requests use multiple services and route traffic based on application URLs, which you can define with Load Balancer Listener Rules.

To accomplish this, you:

1. Create a Service Load Balancer with the type Target Group Only. This step creates a Service Load Balancer that includes a Target Group with a pre-defined name.

2. Create a Shared Load Balancer with the Target Group that was defined.

3. Create routing rules for the Shared Load Balancer and the Target Group it defines.

Creating a Service Load Balancer with the type Target Group Only

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

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

3. Click the Load Balancers tab.

4. If no Load Balancers exist, click the Configure Load Balancer link. If other Load Balancers exist, click Add in the LB listeners card. The Add Load Balancer Listener pane displays.

5. From the Select Type list box, select Target Group Only.

6. You can create a Load Balancer Listener with a type of Target Group Only for Docker or EKS and ECS Services based on your application requirement. Complete the other required fields and click Add.

7. Note the name of the created Target Group by clicking the Info Icon ( ) for the Load Balancer in the LB Listener card and searching for the string TgName. You will select the Target Group when you create a Shared Load Balancer for the Target Group.

   

   Add Load Balancer Listener pane for Target Group Only Type

The Target Group Only Service Load Balancer is displayed in the LB Listeners area in the Load Balancers tab on the Services page.

Load Balancers tab

Creating a Shared Load Balancer for the Target Group

Add a Shared Load Balancer before performing this procedure.

1. In the Load Balancer tab of the Cloud Services -> Networking page, select the Shared Load Balancer you created. The Load Balancer page with the Listeners tab displays.

Networking page displaying Shared Application Load Balancer

Load Balancers page with Listeners tab

1. In the Listeners tab, click Add. The Load Balancer Listener pane displays.

Load Balancer Listener pane with Target Group specified

1. Complete all fields, specifying the Target Group that was created when you added a Load Balancer with the Type Target Group Only in the previous step.

2. Click Save. The Shared Load Balancer for the Target Group displays in the Listeners tab.

Shared Load Balancer for the Target Group

Adding Routing Rules to the Shared Load Balancer

Create a Shared Load Balancer for the Target Group before performing this procedure.

Rules are not supported for Network Load Balancers (NLBs).

1. In the Listeners tab, in the Target Group row, click the Actions menu ( ) and select Manage Rules. You can also select Update attributes from the Actions menu, as well, to dynamically update Target Group attributes. The Listener Rules page displays.

Actions menu for Target Group with Manage Rules and Update attributes options

1. Click Add. The Add LB Listener rule page displays.

Add button on Listener Rules page

1. Create routing rules for the Target Group by setting appropriate Conditions. Add Routing Rules by specifying Rule Type, Values, and Forward Target Group. Forward Target Group lists all the Target Groups created for Docker Native, K8s, and ECS Services. Specify Priority for multiple rules. Use the X button to delete specific Values.

Add LB Listener rule page

1. Click Submit.

Viewing Shared Load Balancer rules

View the rules you defined for any Shared Load Balancer.

1. In the DuploCloud portal, navigate to Cloud Services -> Networking.

2. Select the Load Balancer tab.

3. From the Name column, select the Load Balancer whose rules you want to view.

4. In the Listeners tab, in the appropriate Target Group row, click the Actions menu ( ) and select Manage Rules.

Listener Rules page displaying Shared Load Balancer rules

Updating Target Group attributes

Update attributes for your defined Target Group.

1. In the DuploCloud portal, navigate to Cloud Services -> Networking.

2. Select the Load Balancer tab.

3. From the Name column, select the Load Balancer whose defined Target Group attributes you want to modify.

4. In the Listeners tab, in the appropriate Target Group row, click the Actions menu ( ) and select Update attributes.

Additional Load Balancer Settings

You can use the Other Settings card in the DuploCloud Portal to set the following features:

• WAF Web ACL

• Enable HTTP to HTTPS redirects

• Enable Access Logging

• Set Idle Timeout

• Drop invalid headers

1. In the DuploCloud Portal, navigate to Docker -> Services or Kubernetes -> Service. The Services page displays.

2. Select the Service to which your Load Balancer is attached from the Name column.

3. Click the Load Balancers tab.

4. In the Other Settings card, click Edit. The Other Load Balancer Settings pane displays.

Load Balancers tab with Other Settings card

1. In the Other Load Balancer Settings pane, select any or all options.

Other Load Balancer Settings pane

1. Click Save.

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.