Overview

Security Groups

A security group is a collection of access control rules for cloud resources, such as cloud servers, containers, and databases, that have the same security protection requirements and that are mutually trusted. After a security group is created, you can configure access rules that will apply to all cloud resources added to this security group.

When you create a FlexusL instance, the system automatically creates a default security group (sg-default-smb) and associates it with the instance. You can also create a security group based on service requirements and associate it with the instance. An instance can be associated with multiple security groups, and traffic to and from the instance is matched by priority in a descending order.

For more information about security groups, see Security Group.

Security Group Rules

Each security group has default rules. For details, see Table 1. You can also customize security group rules. For details, see Configuring Security Group Rules for a FlexusL Instance.

Security Group Constraints

• By default, you can create up to 100 security groups in your cloud account.
• By default, you can add up to 50 rules to a security group.
• For better network performance, you are advised to associate no more than five security groups with a FlexusL instance or supplementary network interface.
• You can add up to 20 instances to a security group at a time.
• You can add up to 1,000 instances to a security group.