# Attach pool members

This guide will walk you through the process of adding members to a pool in your Load Balancer. The administrative interface supports two ways of adding members:

* **Via Instances:** Members are specific virtual machines or servers.
* **Via IP Addresses:** Members are public IP addresses or IP addresses within the Load Balancer's subnet.

#### 1. Attaching/Updating Members as Available Instances

1. **Access the Load Balancer Homepage:** Go to `https://hcm-3.console.vngcloud.vn/vserver/load-balancer/vlb`.
2. **Select Your Load Balancer and Pool:** Click on the Load Balancer you want to configure, then select the "Pool" tab. In the pool list, click on the pool you want to attach/edit members to.
3. **Edit Pool Members:** In the pool details on the left, scroll down to the "Member Information" section and click "Edit Pool Members."
4. **Available Instances:** The "Available Instances" section will display a list of backend servers available within the Load Balancer's subnet.
5. **Select Instances:** Choose the instances you want to add as pool members.
6. **Configure Member Details:** Enter the Weight, Port, Monitor Port, and Backup Role for each selected instance.
7. **Attach Members:** Click "Attach" to add the backend servers as pool members.
8. **Review Pool Members:** Review the list of pool members in the "Attached Servers & Instances" section.
9. **Save Changes:** Click "Save" to finalize the pool member edits.

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#### 2. Attaching/Updating Members as IP Addresses

In addition to attaching pool members through backend servers, you can also attach IP addresses as pool members. Follow these steps:

1. **Access the Load Balancer Homepage:** Go to `https://hcm-3.console.vngcloud.vn/vserver/load-balancer/vlb`.
2. **Select Your Load Balancer and Pool:** Click on the Load Balancer you want to configure, then select the "Pool" tab. In the pool list, click on the pool you want to attach/edit members to.
3. **Edit Pool Members:** In the pool details on the left, scroll down to the "Member Information" section and click "Edit Pool Members."
4. **Custom Instances:** In the "Custom Instances" section, follow these steps to attach IP addresses to the pool:
   1. **Enter IP Addresses:** The IP addresses must be either public IPs or belong to the Load Balancer subnet.
   2. **Click "Add":** Add the IP addresses to the Custom Instance list.
   3. **Select IP Addresses:** Choose the IP addresses you want to attach from the Custom Instance list.
   4. **Configure Member Details:** Enter the Weight, Port, Monitor Port, and Backup Role for each selected IP address.
   5. **Click "Attach":** Attach the IP addresses as pool members.
   6. **Review Pool Members:** Review the list of pool members in the "Attached Servers & Instances" section.
   7. **Save Changes:** Click "Save" to finalize the pool member edits.

<figure><img src="https://1985221522-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F7rE7M1L7GYcwQzNGd0aB%2Fuploads%2Fgit-blob-f1f944fc6ec71ad0aa7b9ea0cec1900ff2aefffe%2Fimage.png?alt=media" alt=""><figcaption></figcaption></figure>

**Important Notes:**

* **Available Instances:** The list of available instances will only show servers that are in the same subnet as the Load Balancer.
* **IP Addresses:** Ensure that the IP addresses you enter are valid and accessible.