Add and manage listeners

Here's how to add, view, and manage listeners in Direct Server Return Network load balancer (DSRNLB).

Add listener

1. Go to KakaoCloud Console > Beyond Networking Service > Load Balancing > Load Balancer.

2. Select a load balancer from the load balancer list.

3. In the details screen, click the Listener tab and then click the [Add listener] button.

4. In the popup, select either TCP or UDP protocol and modify the port if necessary.

5. Select a target and click the [Add] button.

info

• After adding a listener, you can connect the target group by going to [More] icon > Configure listener. If the default forwarding target is 'Not set', an error will occur when accessing the service externally. Therefore, please connect a target group.
  
• The port number of the listener protocol must match the port number set on the targets in the target group. Also, the protocol pair of DSRNLB's listener/target group differs from NLB. For more details, refer to the Listener.
• Using a UDP listener requires additional settings and is supported only on specific operating systems. For more details, see Additional configuration for target instance when using UDP listener.

View listener

You can modify, delete, or add new listeners from the load balancer details screen.

View listener list

1. Go to KakaoCloud Console > Beyond Networking Service > Load Balancing > Load Balancer.

2. Select a load balancer to view its listener list from the load balancer list.

3. In the details screen, click the Listener tab to view the list of listeners associated with the Load Balancer.

   Item	Description
   Protocol:Port	Protocol and port of the listener
   ID	ID assigned upon creation
   Provisioning status	Information on whether the listener is being created, modified, or deleted
   Operating status	Information on whether the listener is in a usable state
   Min TLS version	Security policy for TLS communication between client and load balancer - DSRNLB does not support TLS Listener, so this is not applicable
   Default SSL certificate	Certificate used for TLS communication between client and load balancer - DSRNLB does not support TLS Listener, so this is not applicable
   Default action	Default action for handling traffic received by the listener, fixed as Forward - Shows the target group name if a target group is connected
   [More] icon	Provides settings and delete options for the listener

View listener details

1. Go to KakaoCloud Console > Beyond Networking Service > Load Balancing > Load Balancer.

2. Select a load balancer from the Load Balancer list to view its listener details.

3. In the load balancer details screen, click the Listener tab and select a listener.

   Listener details

   Category	Item	Description
   Attributes	Idle timeout	Connection idle timeout setting
   	Max connections	Shows the configured maximum value if set

Manage listener

Modify target group

1. Go to KakaoCloud Console > Beyond Networking Service > Load Balancing > Load Balancer.

2. Click on the load balancer containing the listener to modify from the load balancer list.

3. Click the Listener tab, then click the [More] icon and Configure listener.

4. In the popup, select the new target group from the list and click [OK].

info

The port number of the listener Protocol must match the port number of the targets in the target group. If there are targets with a different port number in the target group to change to, you will not be able to connect.

Configure maximum connections

1. Go to KakaoCloud Console > Beyond Networking Service > Load Balancing > Load Balancer.

2. Select a load balancer from the Load Balancer list that contains the listener to modify.

3. In the details screen, click the Listener tab, then select a listener.

4. Click the [Configure max connections].

5. In the popup, modify the settings:

   • To limit the maximum connections: Turn on the maximum connections option or keep it on, and enter the allowed maximum value.
     (Maximum connections range: 1 to 2,147,483,647)
   • To remove the limit: Turn off the maximum connections option.

   Maximum connections settings

6. Click [Apply].

Configure idle timeout

1. Go to KakaoCloud Console > Beyond Networking Service > Load Balancing > Load Balancer.

2. Select a load balancer from the list.

3. In the details screen, click a listener on the Listener tab.

4. Click the [Configure attributes] button at the top of the properties section in the listener details screen.

5. In the popup, modify the idle timeout setting:

   • Idle timeout: Enter a value in the range of 1 to 4000 seconds (default is 50 seconds).

6. Click [Save].

Delete listener

1. Go to KakaoCloud Console > Beyond Networking Service > Load Balancing > Load Balancer.

2. Select a load balancer from the load balancer list.

3. In the details screen, select the Listener tab.

4. Click the [More] icon and Delete listener.

5. In the popup, enter the confirmation text and click [Delete].