Updated on 2025-08-11 GMT+08:00

Single-Node Redis

This section describes single-node DCS Redis instances.

Single-node instances only have one master node, and can be vulnerable of data reliability and service level agreement (SLA) when a physical server is faulty. Exercise caution. You are not advised to use them in production environments. DCS Service Level Agreement does not apply to single-node instances.

Features

  1. Low-cost and suitable for development and testing

    Single-node instances are 40% cheaper than master/standby DCS instances, suitable for setting up development or testing environments.

  2. Data not persisted

    Data persistence is not ensured through one master node for single-node instances. The data cannot be backed up.

Architecture

Figure 1 shows the architecture of a single-node DCS Redis instance.

  • Redis 3.0 and 6.0 enterprise do not support port customization and allow only port 6379. For Redis 4.0 and later basic, you can specify a port or use the default port 6379. In the following architecture, port 6379 is used. If you have customized a port, replace 6379 with the actual port.
  • The major version of a DCS Redis 4.0 or later instance cannot be upgraded. For example, a single-node DCS Redis 4.0 instance cannot be upgraded to a single-node DCS Redis 5.0 one. If your service requires the features of higher Redis versions, create a DCS Redis instance of a higher version and then migrate data from the old instance to the new one.
Figure 1 Single-node DCS Redis instance architecture

Architecture description:

  • VPC

    The VPC where all nodes of the instance run.

  • Application

    The client of the instance, which is the application running on an Elastic Cloud Server (ECS).

    DCS Redis instances are compatible with Redis, and can be accessed through open-source clients. For examples of accessing DCS instances with different programming languages, see instance access instructions.

  • DCS instance

    A single-node DCS instance, which has only one node and runs one Redis process.