Preparing Required Resources

Overview

Before creating a Kafka instance, ensure the availability of resources, including a virtual private cloud (VPC), subnet, security group, and security group rules. Each Kafka instance is deployed in a VPC and bound to a specific subnet and security group. In this way, Kafka provides an isolated virtual network environment and security protection policies that you can easily configure and manage.

To access a Kafka instance over a public network, prepare an elastic IP address (EIP) in advance.

Required Resources

Table 1 lists the resources required by a Kafka instance.

**Table 1** Kafka resources
Resource	Requirement	Operations
VPC and subnet	Different Kafka instances can use the same or different VPCs and subnets based on site requirements. Note the following when creating a VPC and a subnet: The VPC must be created in the same region as the Kafka instance. Use the default settings when creating a VPC and subnet.	For details about how to create a VPC and subnet, see the Virtual Private Cloud User Guide.
Security group	Different Kafka instances can use the same or different security groups. To use Kafka instances, add the security group rules described in Table 2. Other rules can be added based on site requirements. NOTE: After a security group is created, its default inbound rule allows communication among ECSs within the security group and its default outbound rule allows all outbound traffic. In this case, you can access a Kafka instance within a VPC, and do not need to add rules according to Table 2.	For details about how to create a security group and configure security group rules, see the Virtual Private Cloud User Guide.
EIP	Note the following when creating EIPs: The EIPs must be created in the same region as the Kafka instance. The number of EIPs must be the same as the number of Kafka instance brokers. The Kafka console cannot identify IPv6 EIPs.	For details about how to create an EIP, see "Assigning an EIP" in Elastic IP User Guide.

**Table 2** Security group rules
Direction	Protocol	Port	Source	Description
Inbound	TCP	9094	0.0.0.0/0	Access a Kafka instance through the public network (without SSL encryption).
Inbound	TCP	9092	0.0.0.0/0	Access a Kafka instance within a VPC (without SSL encryption).
Inbound	TCP	9095	0.0.0.0/0	Access a Kafka instance through the public network (with SSL encryption).
Inbound	TCP	9093	0.0.0.0/0	Access a Kafka instance within a VPC (with SSL encryption).
Inbound	TCP	9999	0.0.0.0/0	Access Kafka Manager.
Inbound	TCP	9011	198.19.128.0/17	Access a Kafka instance across VPCs using a VPC endpoint (with or without SSL).
Inbound	TCP	9011	0.0.0.0/0	Access a Kafka instance using DNAT (with or without SSL).