TencentDB Security Group Management

Last updated: 2021-04-06 10:33:26


    A security group is a stateful virtual firewall capable of filtering. As an important means for network security isolation provided by Tencent Cloud, it can be used to set network access controls for one or more TencentDB instances. Instances with the same network security isolation demands in one region can be put into the same security group, which is a logical group. TencentDB and CVM share the security group list and are matched with each other within the security group based on rules. For specific rules and limitations, please see Security Group Overview.


    • TencentDB for MySQL security groups currently only support network access control for VPCs and public network but not the classic network.
    • Security groups that currently support public network access are available only in the Guangzhou, Shanghai, Hong Kong (China), Beijing, Chengdu, Chongqing, Seoul, and Tokyo regions.
    • As TencentDB does not have active outbound traffic, outbound rules are not applicable to TencentDB.
    • TencentDB for MySQL security groups support source instances, read-only replicas, and disaster recovery instances.
    • Security groups are not supported for basic single-node TencentDB for MySQL instances.

    Configuring Security Groups for TencentDB

    Step 1. Create a security group

    1. Log in to the CVM console.
    2. Select Security Group on the left sidebar, select a region, and click New.
    3. In the pop-up dialog box, configure the following items and click OK.
    • Template: select a template based on the service to be deployed on the TencentDB instance in the security group, which simplifies the security group rule configuration, as shown below:
      Open all portsAll ports are open. May present security issues.-
      Open ports 22, 80, 443, and 3389 and the ICMP protocolPorts 22, 80, 443, and 3389 and the ICMP protocol are opened to the internet. All ports are opened to the private network.This template does not take effect for TencentDB.
      CustomYou can create a security group and then add custom rules. For detailed directions, please see "Step 2. Add a security group rule" below.-
    • Name: name of the security group.
    • Project: by default, DEFAULT PROJECT is selected. Select a project for easier management.
    • Notes: a short description of the security group for easier management.

    Step 2. Add a security group rule

    1. On the Security Group page, click Modify Rule in the Operation column on the row of the security group for which to configure a rule.
    2. On the security group rule page, click Inbound rule > Add Rule.
    3. In the pop-up dialog box, set the rule.
    • Type: "Custom" is selected by default. You can also choose another system rule template, such as MySQL (3306).
    • Source or Target: traffic source (inbound rules) or target (outbound rules). You need to specify one of the following options:
      Source or TargetDescription
      A single IPv4 address or an IPv4 rangeIn CIDR notation, such as, or, where indicates all IPv4 addresses will be matched.
      A single IPv6 address or an IPv6 rangeIn CIDR notation, such as FF05::B5, FF05:B5::/60, ::/0 or 0::0/0, where ::/0 or 0::0/0 indicates all IPv6 addresses will be matched.
      ID of referenced security group. You can reference the ID of:
      • Current security group
      • Other security group
      • To reference the current security group, please enter the ID of security group associated with the CVM.
      • You can also reference another security group in the same region and belongs to the same project by entering the security group ID.
      Reference an IP address object or IP address group object in a parameter template.-
    • Protocol Port: enter the protocol type and port range or reference a protocol/port or protocol/port group in a parameter template.


      To connect to TencentDB for MySQL, port 3306 must be opened.

    • Policy: Allow or Reject. Allow is selected by default.
      • Allow: traffic to this port is allowed.
      • Reject: data packets will be discarded without any response.
    • Notes: a short description of the rule for easier management.
    1. Click Complete.

    Use cases

    Scenario: you have created a TencentDB for MySQL instance and want to access it from a CVM instance.
    Solution: when adding security group rules, select MySQL(3306) in Type to open port 3306.
    You can also allow all IPs or specified IPs (IP ranges) based on your actual needs so as to configure IP sources that can access TencentDB for MySQL through CVM.

    Direction Type Source Port Policy
    Inbound MySQL(3306) All IP:
    Specified IP: enter the specified IPs or IP ranges
    TCP:3306 Allow

    Step 3. Configure a security group

    A security group is an instance-level firewall provided by Tencent Cloud for controlling inbound traffic of TencentDB. You can associate a security group with an instance when purchasing it or later in the console.


    Currently, security groups can be configured only for TencentDB for MySQL instances in VPC.

    1. Log in to the TencentDB for MySQL console. In the instance list, click an instance ID/name or Manage in the Operation column to access the instance management page.
    2. On the Security Group tab, click Configure Security Group.
    3. In the pop-up dialog box, select the security group to be bound and click OK.

    Importing Security Group Rules

    1. On the Security Group page, click the ID/name of the target security group.
    2. On the inbound rule or outbound rule tab, click Import Rule.
    3. In the pop-up dialog box, select an edited inbound/outbound rule template file and click Import.


      If there are existing rules in the security group, export them before importing new rules. Existing rules are overwritten after importing.

    Cloning Security Groups

    1. On the Security Group page, locate the desired security group and click More > Clone in the Operation column.
    2. In the pop-up dialog box, select the target region and target project, enter the new security group name, and click OK. If the new security group needs to be associated with a CVM instance, do so by managing the CVM instances in the security group.

    Deleting Security Groups

    1. On the Security Group page, locate the security group to be deleted and click More > Delete in the Operation column.
    2. Click OK in the pop-up dialog box. If the current security group is associated with a CVM instance, it must be disassociated before it can be deleted.

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