Updated on 2024-03-05 GMT+08:00

Step 4: Add a Security Group Rule

Scenarios

A security group is a collection of access control rules to control the traffic that is allowed to reach and leave the cloud resources that it is associated with. The cloud resources can be cloud servers, containers, databases, and more. A security group consists of inbound and outbound rules.

Like whitelists, security group rules work as follows:
  • Inbound rules control incoming traffic to instances in the security group.

    If an inbound request matches the source in an inbound security group rule with Action set to Allow, the request is allowed and other requests are denied.

    By default, you do not need to configure deny rules in the inbound direction because requests that do not match allow rules will be denied.

  • Outbound rules control outgoing traffic from instances in the security group.

    If the destination of an outbound security group rule with Action set to Allow is 0.0.0.0/0, all outbound requests are allowed.

    0.0.0.0/0 represents all IPv4 addresses.

If the rules of the security group associated with your instance cannot meet your requirements, for example, you need to allow inbound traffic on a specific TCP port, you can add an inbound rule to allow traffic on the TCP port.

Procedure

  1. Log in to the management console.
  2. Click in the upper left corner and choose Network > Virtual Private Cloud.

    The Virtual Private Cloud page is displayed.

  3. In the navigation pane on the left, choose Access Control > Security Groups.

    The security group list is displayed.

  4. 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.

  5. On the Inbound Rules tab, click Add Rule.

    The Add Inbound Rule dialog box is displayed.

  6. 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.

    Currently, the value can be All, TCP, UDP, ICMP, or more.

    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. For example:
    • IP address:
      • Single IP address: 192.168.10.10/32 (IPv4); 2002:50::44/128 (IPv6)
      • All IP addresses: 0.0.0.0/0 (IPv4); ::/0 (IPv6)
      • IP address range: 192.168.1.0/24 (IPv4); 2407:c080:802:469::/64 (IPv6)

    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

    Supplementary information about the security group rule. This parameter is optional.

    The security group rule description can contain a maximum of 255 characters and cannot contain angle brackets (< or >).

    N/A

  7. Click OK.

    The inbound rule list is displayed.

  8. On the Outbound Rules tab, click Add Rule.

    The Add Outbound Rule dialog box is displayed.

  9. 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.

    Currently, the value can be All, TCP, UDP, ICMP, or more.

    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:

    • IP address:
      • Single IP address: 192.168.10.10/32 (IPv4); 2002:50::44/128 (IPv6)
      • All IP addresses: 0.0.0.0/0 (IPv4); ::/0 (IPv6)
      • IP address range: 192.168.1.0/24 (IPv4); 2407:c080:802:469::/64 (IPv6)

    0.0.0.0/0

    Description

    Supplementary information about the security group rule. This parameter is optional.

    The security group rule description can contain a maximum of 255 characters and cannot contain angle brackets (< or >).

    N/A

  10. Click OK.

    The outbound rule list is displayed.