# Instance
## Create and Manage NLB Instances

NLB is a load balancing service specifically for the fourth layer, which can distribute TCP/UDP requests from clients to backend service nodes. This article introduces how to create an NLB product instance.

## Create Instance

   1. Log in to the NLB console.
   2. On the instance list page, click **Create Load Balancer**.
   3. On the **NLB** purchase page, complete the following configuration:

   | Configuration | Description                                                                 | Mandatory |
   | :------------ | :-------------------------------------------------------------------------- | :-------- |
   | Region        | Select the region to which the instance belongs                             | Yes       |
   | Protocol Version | **IPv4**: Indicates that the NLB instance only supports client access using IPv4 address. | Yes |
   | Associated VPC             | Select the VPC to which the instance belongs                                 | Yes |
   | Associated Subnet          | Select the subnet to which the instance belongs                              | Yes |
   | Public Elastic IP | You can choose to create a public elastic IP with the current instance, or you can choose not to choose an elastic IP, and you can purchase and bind the elastic IP after creating the instance.| No |
   | Instance Name   | Enter a custom instance name                                                 | Yes |
   | Business Group  | Select the business group to which the NLB belongs                            | No  |
   | Billing Information | Select the payment method, and check product billing for details                 | Yes |

   4. Click **Purchase Now** and follow the console prompts to complete the creation of the instance.
   5. Return to the **Instance List** page, and select the corresponding region to see the newly created instance.

## Modify Instance Names and Remarks

   Modifying the instance name can help you better manage your instances.
   1. Log in to the NLB console.
   2. On the top menu bar, select the region to which the instance belongs.
   3. On the instance list page, select the instance you want to modify, click the edit icon at the instance name.
   <!-- image-todo -->
   4. In the modify pop-up window, modify the resource name and remarks, and then click **Confirm**.

## Bind Elastic IPs

   1. Log in to the NLB console.
   2. On the top menu bar, select the region to which the instance belongs.
   3. On the **NLB List** page, find the target instance, and then select **Bind Elastic IP** in the **Operation** column.
   <!-- image-todo -->
   4. In the **Bind Elastic IP** pop-up window, select the EIP you need to bind, and then click **Confirm**.

## Change Business Groups

   A business group can help you classify your load balancer instances, such as by business, use, etc.

   1. Log in to the NLB console.
   2. On the top menu bar, select the region to which the instance belongs.
   3. On the **NLB List** page, find the target instance, and then select **Edit UGroup** in the **Operation** column.
   <!-- image-todo -->
   4. If you need to change the business group in batches, you can check the options on the left side of the page.
   5. In the **Edit UGroup** dialog box, select the target business group, and then click **Confirm**.
   6. A load balancer instance can only be bound to one business group.

## Delete Instances

   You can delete any load balancer instances you no longer need, to avoid extra bills.

   1. Log in to the NLB console.
   2. On the top menu bar, select the region to which the instance belongs.
   3. On the NLB **Instance** page, find the target instance, and then select **Delete** in the **Operation** column.
   <!-- image-todo -->
   4. In the **Delete Instance** pop-up window, click **Confirm**.