Connection Methods

GeminiDB Cassandra can be accessed through Data Admin Service (DAS), private networks, and public networks.

Figure 1 shows the process of connecting to a GeminiDB Cassandra instance.

Figure 1 Connection Methods

**Table 1** Connection methods
Method	Scenario	Default Port	Description
DAS	You can log in to an instance on the console without using an IP address.	-	Easy to use, secure, advanced, and intelligent By default, you have the permissions required for remote login. It is recommended that you use the DAS service to log in to DB instances. DAS is secure and convenient.
Private network	Private IP addresses are provided by default. Your applications are deployed on an ECS that is in the same region and VPC as your instances.	8635	High security and performance If the ECS and GeminiDB Cassandra instance are in the same security group, they can communicate with each other by default. No security group rule needs to be configured. If they are in different security groups, configure security group rules for them, separately. Configure inbound rules of a security group for GeminiDB Cassandra instances by following Configuring Security Group Rules. The default security group rule allows all outbound data packets, so you do not need to configure a security rule for the ECS. If not all access from the ECS is allowed, you need to configure an outbound rule for the ECS.
Public network	If you cannot access a DB instance through a private IP address, bind an EIP to the DB instance first and connect the ECS to the DB instance through the EIP.	8635	Low security For faster transmission and improved security, migrate your applications to an ECS that is in the same subnet as your instance and use a private IP address to access the instance. .
Java	An example of connecting to a GeminiDB Cassandra instance using Java is provided.	8635	-
Go	An example of connecting to a GeminiDB Cassandra instance using Go is provided.	8635	-