How Can I Configure Security Group Rules?

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Security group rules consist of inbound and outbound rules.


When adding an inbound rule, you can set the source address to a security group or CIDR block. If you want to set the source address to a security group, you can only select security groups from the same VPC as the destination security group.


When adding an outbound rule, you can set the destination address to a security group or CIDR block. If you want to set the destination address to a security group, you can only select security groups from the same VPC as the source security group.


ECSs in security groups in different VPCs cannot communicate with one another. To allow them to communicate, bind EIPs to them and configure security group rules.



Other related questions:
How Can I Set a ServiceCenter Security Group Rule to Deny
【Product�? ManageOne ServiceCenter 【Version�? 3.0.9 【Question�? How can I set a ServiceCenter security group rule to deny? 【Answer�? A security group can only be configured with a whitelist (allowing access from a network segment) and cannot be denied (denying access from a network segment). ----End

Can I Change the Security Group to Which an ECS Belongs?

Yes. Log in to the ECS console, switch to the page showing ECS details, and change the security group to which the ECS belongs.


What Is a Security Group?

A security group implements access control for ECSs within a security group and between different security groups. After a security group is created, you can create different access rules for the security group to protect the ECSs that are added to this security group.


How Do I Add a Cloud Host to a Security Group
The security group is a cloud host access security control method that specifies the communication scope of cloud hosts in the same or different security groups. You can define different access rules for a security group, and these rules take effect for all cloud hosts added to this security group. For details,seeHow Do I Add a Cloud Host to a Security Group, The applicable version is 3.0.8 or 3.0.9.

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