Step 5: Add a Security Group Rule
Scenarios
A security group consists of inbound and outbound rules. You can add security group rules to allow or deny the traffic to reach and leave the instances (such as ECSs) in the security group.
Adding Rules to a Security Group
- Log in to the management console.
- Click in the upper left corner and choose Network > Virtual Private Cloud.
The Virtual Private Cloud page is displayed.
- In the navigation pane on the left, choose Access Control > Security Groups.
The security group list is displayed.
- Locate the row that contains the target security group, and click Manage Rule in the Operation column.
The page for configuring security group rules is displayed.
- On the Inbound Rules tab, click Add Rule.
The Add Inbound Rule dialog box is displayed.
- Configure required parameters.
You can click + to add more inbound rules.
Table 1 Inbound rule parameter description Parameter
Description
Example Value
Type
Source IP address version. You can select:- IPv4
- IPv6
IPv4
Protocol & Port
The network protocol used to match traffic in a security group rule. The value can be All, TCP, UDP, GRE, and ICMP.
TCP
Destination port used to match traffic in a security group rule. The value can be from 1 to 65535.
Inbound rules control incoming traffic over specific ports to instances in the security group.
22, or 22-30
Source
Source of the security group rule. The value can be an IP address or a security group to allow access from IP addresses or instances in the security group. If you select IP address for Source, you can enter multiple IP addresses in the same IP address box. Each IP address represents a different security group rule.- IP address:
- Single IP address: 192.168.10.10/32
- All IP addresses: 0.0.0.0/0
- IP address range: 192.168.1.0/24
If the source is a security group, this rule will apply to all instances associated with the selected security group.
0.0.0.0/0
Description
(Optional) Supplementary information about the security group rule.
The description can contain a maximum of 255 characters and cannot contain angle brackets (< or >).
-
- Click OK.
The inbound rule list is displayed.
- On the Outbound Rules tab, click Add Rule.
The Add Outbound Rule dialog box is displayed.
- Configure required parameters.
You can click + to add more outbound rules.
Table 2 Outbound rule parameter description Parameter
Description
Example Value
Type
Destination IP address version. You can select:- IPv4
- IPv6
IPv4
Protocol & Port
The network protocol used to match traffic in a security group rule. The value can be All, TCP, UDP, GRE, and ICMP.
TCP
Destination port used to match traffic in a security group rule. The value can be from 1 to 65535.
Outbound rules control outgoing traffic over specific ports from instances in the security group.
22, or 22-30
Destination
Destination of the security group rule. The value can be an IP address or a security group to allow access to IP addresses or instances in the security group. For example: If you select IP address for Destination, you can enter multiple IP addresses in the same IP address box. Each IP address represents a different security group rule.
- IP address:
- Single IP address: 192.168.10.10/32
- All IP addresses: 0.0.0.0/0
- IP address range: 192.168.1.0/24
0.0.0.0/0
Description
(Optional) Supplementary information about the security group rule.
The description can contain a maximum of 255 characters and cannot contain angle brackets (< or >).
-
- Click OK.
The outbound rule list is displayed and you can view your added rule.
Verifying Security Group Rules
After allowing traffic over a port in a security group rule, you need to ensure that the port used by the instance is also opened.
- Log in to the ECS and check whether the ECS port is opened.
- Checking the port of a Linux server
Run the following command to check whether TCP port 80 is being listened on:
netstat -an | grep 80
If the following figure is displayed, TCP port 80 is enabled.
Figure 1 Command output for the Linux ECS
- Checking the port of a Windows server
- Checking the port of a Linux server
- Enter http://ECS EIP in the address box of the browser and press Enter.
If the requested page can be accessed, the security group rule has taken effect.
Feedback
Was this page helpful?
Provide feedbackThank you very much for your feedback. We will continue working to improve the documentation.See the reply and handling status in My Cloud VOC.
For any further questions, feel free to contact us through the chatbot.
Chatbot