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How to Select and Configure a Security Group?

Updated at: Aug 31, 2019 GMT+08:00

Intra-VPC Access to DCS Instances

An ECS can communicate with a DCS instance if they belong to the same VPC and security group rules are configured correctly.

  1. It is recommended that the ECS and DCS instance belong to the same security group. After a security group is created, the security group rules, by default, include a rule allowing members in the security group to access each other without any restrictions.
  2. If the ECS and DCS instance belong to different security groups, add security group rules to ensure that the ECS and DCS instance can access each other.
    • Suppose that the ECS on which the client runs belongs to security group sg-ECS, and the DCS instance that the client will access belongs to security group sg-DCS.
    • Suppose that the port number of the DCS instance is 6379.
    • The remote end is a security group or an IP address.

    Security group rules allowing the ECS to access the DCS instance:

    Security group rules making the DCS instance accessible to the ECS:

Public Access to DCS Instances

A client can access a DCS instance only after rules are correctly configured for the security group of the instance.

For example, for security group sg-DCS, you need to configure the following rules in the inbound direction:

Protocol: TCP; source IP address: or a specified client address. When SSL is enabled, set the port number to 36379. When SSL is disabled, set the port number to 6379.

Figure 1 Security group rule (port 36379)
Figure 2 Security group rule (port 6379)

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