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
- 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.
- 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.
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.
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