Create and manage DSRNLB

Direct Server Return Network Load Balancer (DSRNLB) processes traffic at OSI Layer 4, the transport layer. After packets sent from the client to the DSRNLB are delivered to the targets in the target group, responses to that traffic are sent directly to the client without passing through the load balancer. This behavior is called Direct Server Return (DSR).
The listener of a DSRNLB can use the TCP and UDP protocols and connects to one default target group. All traffic entering the listener is routed to the default target group.
The following describes how to manage DSRNLB, including creating it, viewing the list, monitoring, changing information, and configuring security groups.

Create load balancer

The following describes how to create a DSRNLB.

1. Go to KakaoCloud console > Networking > Load Balancing > Load balancer.
2. Click the [Create load balancer] button at the top right.
3. In Select type, choose Direct Server Return Network Load Balancer.
4. Configure the information required to create the load balancer, and then click the [Create] button.

   Category	Item	Description
   Basic information	Load balancer name	Name of the load balancer
   	Load balancer description	Description of the load balancer
   Network	VPC	Select from the VPCs available in the project
   	Subnet	Displays the list of subnets in the selected VPC
   Listener	Protocol	TCP, UDP
   	Port	Enter a value in the range 1 to 65535
   	Detailed settings	Idle timeout: Set the idle timeout

caution

For DSRNLB, the listener port and the port number of the targets in the target group connected to that listener must be set to the same value, and additional configuration is required on the target instances. In addition, a target group already connected to a listener cannot be connected to another listener of the same DSRNLB.
For additional configuration on the target instances, see Create and manage target groups.

View load balancer list and basic information

You can view the list of load balancers and their basic information.

1. Go to KakaoCloud console > Networking > Load Balancing > Load balancer.
2. Check the list of load balancers.

   Category	Description
   Name	Name entered when created
   ID	ID assigned when created
   Provisioning status	Indicates whether the load balancer was created successfully or whether modification or deletion is in progress
   Operating status	Indicates whether the created load balancer is available for use
   Type	Type of the load balancer
   Private IP	Private IP address automatically assigned to the load balancer
   Public IP	Public IP address assigned by the user
   VPC	VPC that includes the load balancer
   Availability zone	Availability zone selected when created
   Created at	Date when the load balancer was created

info

The private IP information of the DSRNLB is required for additional configuration on the target instances. Check this information in advance.

View load balancer details

You can view detailed information about the load balancer.

1. Go to KakaoCloud console > Networking > Load Balancing > Load balancer.
2. Select the load balancer for which you want to view details.
3. Check the information in each tab.
   Details tab

   Item	Description
   Name	User-defined name used to identify the load balancer
   ID	ID automatically assigned when the load balancer is created
   Provisioning status	Progress status of resource creation and configuration
   Operating status	Current operating status indicating whether it can process actual traffic
   Load balancer type	Type of the load balancer
   Access log	Whether request/response log collection is enabled for the load balancer
   VPC	Information about the VPC to which the load balancer belongs
   VPC ID	ID of the connected VPC
   Subnet	Information about the subnet where the load balancer is deployed
   Subnet ID	ID of the connected subnet
   Public IP	Public IP address for external internet communication
   Private IP	Private IP address for internal network communication
   Listener	Number of created listeners
   Availability zone	Availability zone where the load balancer is deployed
   Created at	Date and time when the load balancer was created

   Listener tab

   Item	Description
   Protocol:Port	Protocol and port number received by the listener
   ID	ID of the listener
   Provisioning status	Status of applying the listener settings
   Operating status	Current operating status of the listener
   Minimum TLS version	Minimum allowed TLS protocol version
   Default SSL certificate	Default SSL certificate used for HTTPS communication
   Default action	Traffic processing method performed by default when a request is received
   Number of added rules	Number of rules additionally configured besides the default action

   Monitoring tab

   Item	Description
   Query period	Set the period for viewing monitoring data
   Auto refresh	Whether monitoring data is automatically refreshed
   Display mode	Configure graph or data display format
   Traffic metrics	Traffic-related statistics such as request count and throughput
   Status metrics	Status-related statistics such as healthy/unhealthy responses

Rename load balancer

1. Go to KakaoCloud console > Networking > Load Balancing > Load balancer.
2. In the Load balancer menu on the left, select [⋮] > Rename for the target load balancer.
3. Enter the information in the pop-up window, and then click the [Change] button.

Modify load balancer attributes

1. Go to KakaoCloud console > Networking > Load Balancing > Load balancer.
2. In the Load balancer menu on the left, select [⋮] > Modify attributes for the target load balancer.
3. Complete the modifications and then click the [Modify] button.

Associate public IP

1. Go to KakaoCloud console > Networking > Load Balancing > Load balancer.
2. In the Load balancer menu on the left, select [⋮] > Associate public IP for the target load balancer.
3. Complete the settings in the pop-up window, and then click the [Associate] button.
   • Create a new public IP and assign automatically: When creating and associating a new public IP
   • Select from existing public IP list: When associating an existing public IP

Disassociate public IP

1. Go to KakaoCloud console > Networking > Load Balancing > Load balancer.
2. In the Load balancer menu on the left, select [⋮] > Disassociate public IP for the target load balancer.
3. Select the public IP to disassociate in the pop-up window, and then click the [Disassociate] button.

Configure access log

Access Log is an optional feature and is set to disabled by default.
The following describes how to enable or disable access logs.

Enable access log

The following describes how to enable access logs.

1. Go to KakaoCloud console > Networking > Load Balancing > Load balancer.
2. In the Load balancer menu on the left, click [⋮] > Configure access log for the target load balancer.
3. In the pop-up window, set access log to Enabled.
4. Select the bucket where access logs will be stored. You can configure whether encryption is used for the selected bucket.
   • Encrypting the bucket is recommended for security.
   • For more information about creating an Object Storage bucket, see Object Storage > Create and manage buckets.
5. Select the Access key ID.
   • The selected access key ID must have its expiration period set to No expiration. For creating an access key, see Credentials.
     
   info

   • When creating an access key, you must store the secret access key separately.
   • When access logs are enabled, bucket usage charges apply for log storage. In this case, you can set the retention period for access logs using the Lifecycle settings of the bucket. For more information, see Object Storage > Configure Lifecycle.
6. Enter the Secret access key paired with the access key ID, and then click the [Save] button.

Disable access log

The following describes how to disable access logs.

1. Go to KakaoCloud console > Networking > Load Balancing > Load balancer.
2. In the Load balancer menu on the left, click [⋮] > Configure access log for the target load balancer.
3. In the pop-up window, select Disabled for access log, and then click the [Save] button.

Delete load balancer

1. Go to KakaoCloud console > Networking > Load Balancing > Load balancer.
2. In the Load balancer menu on the left, click [⋮] > Delete load balancer for the target load balancer.
3. Enter the delete confirmation text in the pop-up window, and then click the [Delete] button.