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.
- TencentDB for MySQL security group currently only supports network access control for VPC and public networks 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 no outbound traffic is generated for TencentDB instances, outbound rules do not take effect for TencentDB.
- TencentDB for MySQL security groups support master instances, read-only instances, and disaster recovery instances.
- Security group is not supported for the TencentDB for MySQL Basic Edition.
Security Group Configuration for TencentDB
Step 1. Create a security group
- Log in to the CVM Console.
- Select Security Group on the left sidebar, select a region, and click Create.
- In the pop-up dialog box, configure the following items and click OK.
- Template: select an appropriate 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 ports||All ports are opened to the public and private networks. This may present security issues.||-|
|Open ports 22, 80, 443, and 3389 and the ICMP protocol||Ports 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.|
|Custom||You can create a security group and then add custom rules. For detailed directions, please see "Step 2. Add a security group rule" below.||-|
- Name: custom name of the security group.
- Project: the default project is selected by default. You can also select another one for easier management.
- Remarks: a short description of the security group for easier management.
Step 2. Add a security group rule
- 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.
- On the security group rule page, click Inbound Rules > Add Rule.
- In the pop-up dialog box, set the rule.
- Type: "Custom" is selected by default. You can also choose another system rule template. MySQL(3306) is recommended.
- Source: traffic source (inbound rule) or destination (outbound rule). You need to specify one of the following options:
|IPv4 address or IPv4 address range||In CIDR format (such as |
0.0.0.0/0 indicates all IPv4 addresses).
|IPv6 address or IPv6 address range||In CIDR format (such as |
0::0/0 indicate all IPv6 addresses).
|ID of referenced security group. You can reference the ID of: |
- Current security group
- Another security group
- Current security group: CVM instance associated with the current security group.
- Another security group: ID of another security group in the same region under the same project.
|Reference IP address object or IP address group object in a parameter template.||-|
- Protocol port: enter the protocol type and port range or reference an IP address object or IP address group object in a parameter template.
To connect to TencentDB for MySQL, port 3306 must be opened.
- Policy: "Allow" is selected by default.
- Allow: traffic to this port is allowed.
- Reject: data packets will be discarded without any response.
- Remarks: a short description of the rule for easier management.
- Click Complete to finish adding the inbound rule.
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.
||All IP: 0.0.0.0/0
Specified IP: enter the specified IPs or IP ranges
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.
- Log in to the TencentDB for MySQL Console.
- In the instance list, select the instance for which to configure a security group and click Manage in the "Operation" column to enter the instance management page.
- On the Security Group tab, click Configure Security Group.
- In the pop-up dialog box, select the security group to be bound and click OK.
Security Group Rule Import
- On the Security Group page, click the ID/name of the target security group.
- On the inbound rules or outbound rules tab, click Import Rule.
- In the pop-up dialog box, select an edited inbound/outbound rule template file and click Start Import.
If there are existing rules in the security group, export them before importing new rules. Existing rules are overwritten after importing.
Security Group Clone
- On the Security Group page, select a security group and click More > Clone in the "Operation" column.
- In the pop-up dialog box, select the target region and target project 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.
Security Group Deletion
- On the security group page, select the security group to be deleted and click More > Delete in the "Operation" column.
- 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.