Help Center/ Relational Database Service/ Getting Started/ Getting Started with RDS for PostgreSQL/ Step 2: Connect to a DB Instance/ Overview
Updated on 2023-04-17 GMT+08:00
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Overview

An RDS DB instance can be connected through a private network, Data Admin Service (DAS), or a public network.

Table 1 RDS connection methods

Connect Through

IP Address

Scenarios

Description

DAS

No IP address is required. You can connect to your DB instance through DAS on the management console.

DAS enables you to manage databases on a web-based console and provides you with database development, O&M, and intelligent diagnosis to make it easy to use and maintain your databases. The permissions required for connecting to DB instances through DAS are enabled by default.
  • Easy to use, secure, advanced, and intelligent
  • Recommended

Private network

Floating IP

RDS provides a floating IP address by default.

When your applications are deployed on an ECS that is in the same region and VPC as RDS, you are advised to use a floating IP address to connect to the RDS DB instance through the ECS.
  • Secure and excellent performance
  • Recommended

Public network

EIP

If you cannot access an RDS DB instance through a floating IP address, bind an EIP to the DB instance and connect the DB instance through the EIP.
  • A relatively lower level of security compared to other connection methods
  • To achieve a higher transmission rate and security level, you are advised to migrate your applications to an ECS that is in the same VPC as your RDS DB instance and use a floating IP address to access the DB instance.
  • VPC: indicates the Virtual Private Cloud.
  • ECS: indicates the Elastic Cloud Server.
  • If the ECS is in the same VPC as your RDS DB instance, you do not need to apply for an EIP.

Figure 1 illustrates the connection over a private network or a public network.

Figure 1 DB instance connection