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RDS for PostgreSQL

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Configuring allowlists

This topic describes how to manually add the client IP address or IP address range to the allowlist to successfully access the PostgreSQL instance.

Background information

Allowlist is a security prevention and control method for database connections, only IP addresses in the allowlist can access the database. After a PostgreSQL instance is created, it will not be associated with any allowlist, and all IP addresses are prohibited from accessing the instance by default. Therefore, whether you access the instance through a private network or a public network connection, you need to configure an allowlist for the instance to ensure that the instance can be connected.

The allowlist supports setting IP address segments in CIDR format, such as: 192.168.0.0/24 (any integer between 1 and 32 can be entered after (/)), allowing access by IP addresses in this network segment.

The allowlist needs to be maintained regularly to remove IP addresses that are no longer needed to access the PostgreSQL instance to ensure the security of database connections.

Precautions

If 0.0.0.0/0 is set, the instance will allow access from all addresses. If 127.0.0.1 is set, access from all addresses will be disabled. If both 0.0.0.0/0 and 127.0.0.1 are set, access is allowed from all addresses.

Usage restrictions

Each tenant can create up to 500 allowlists for PostgreSQL under each region.

Each allowlist can contain up to 300 IP addresses or IP address ranges.

Each allowlist can be associated with up to 1,000 instances.

Each instance can associate up to 100 allowlists.

The total number of IP addresses or IP address segments in all allowlists associated to each instance cannot exceed 300. When there are many IP addresses, it is recommended to merge scattered IP addresses into IP address segments.

It is forbidden to add IP addresses in the form x.x.x.x/0 other than 0.0.0.0/0 to the allowlist.

Procedure

In the upper left corner of the top menu bar, select the region to which the allowlist belongs.

Click Allowlists on the left navigation bar, click Create allowlist to enter the Create allowlist page.

After completing the following settings on the Create allowlist page that pops up, click OK.

Parameters	Note
Allowlist name	Required The naming convention for allowlist names is as follows: Within the current region, the allowlist name is unique. Begin with Chinese, a letter, or an underscore (_). Can only contain Chinese characters, letters, digits, underscores (_) and hyphens(-). The name length is limited to 1~128 characters.
Description	Optional The description information can be used to search for the allowlist in the allowlist list, and the length of the description should not exceed 200 characters.
IP address	Required. Only IP addresses added to the allowlist can access the instance. Supports pasting IP addresses or IP address segments, separated by Chinese and English commas, spaces or newlines.
Default allowlist	Select whether to configure this allowlist as default allowlist. After the tenant dimension is set to the default allowlist, this allowlist is selected by default when creating an instance. tip An allowlist can associate up to 500 instances. After exceeding the upper limit, please modify the default allowlist. If you specify an allowlist as the default allowlist when creating or editing it, the allowlist will replace the default allowlist (if any).
Security group	RDS for PostgreSQL allowlist supports associating ECS security groups. If you adjust the ECS security group after the association, you can synchronize the security group in RDS for PostgreSQL allowlist to get the latest IP list in a timely manner. Click Select security group, select the security group you want to associate in the Edit security group window, and then click OK. Support for binding through two modes: Associated ECSIP: Allows the ECS within the security group to access the database, currently only the IP information import of the main network interface card is supported. Inbound IP: Allow IP access to the database involved in the TCP and ALL protocols in the source address of the security group entry direction. If the source address is configured as security group, it will be ignored. tip Each allowlist can add up to 10 security groups. ECS security groups can be associated in two ways simultaneously. When binding a security group using Inbound IP mode, an address in the security group is not added to the PostgreSQL allowlist if the policy is Denied.

Related APIs

API	Description
CreateAllowList	Call the CreateAllowList API to create an allowlist.

Last updated: 2025.11.17 20:31:12