Configuring a TCP Listener
Last updated: 2019-11-05 15:24:03PDF
TCP Listener Overview
You can create a TCP listener to a CLB instance to forward TCP requests from the client. TCP is suitable for scenarios that have high requirements for reliability and data accuracy but relatively low requirements for transfer speed, such as file transfer, email messaging, and remote login. For TCP listeners, the real server can directly get the real client IP.
You need to create a CLB instance first.
Configuring a TCP Listener
Step 1. Open the "Listener Management" page
- Log in to the CLB Console.
- Select Instance Management on the left sidebar.
- In the instance list, click the ID of the instance to be configured to enter the instance details page.
- Click the Listener Management tab or click Configure Listener in the "Operation" column.
- The "Listener Management" page is as shown below:
Step 2. Configure a listener
Click Create in TCP/UDP Listener and configure a TCP listener in the pop-up window.
1. Basic configuration
|Listener protocol and listening port||Listener protocol and listening port.
|Balancing method||For TCP listeners, CLB supports two scheduling algorithms: weighted round robin (WRR) and weighted least connections (WLC).
The specific configuration of the created TCP listener is as shown below:
2. Health check
|Health check status||Health check can be enabled or disabled. In TCP listeners, CLB instances send SYN packets to the specified server port to perform health checks.||Enabled|
|Response timeout period||2s|
|Unhealthy threshold||3 times|
|Healthy threshold||3 times|
The specific configuration of health check is as shown below:
3. Session persistence
|Session persistence status||Session persistence can be enabled or disabled.
|Session persistence time||Session persistence time.
The specific configuration of session persistence is as shown below:
Step 3. Bind a real server
- On the "Listener Management" page, click the created listener
TCP:80to view the bound real servers on the right of the listener.
- Click Bind and select the real server to be bound and configure the server port and weight in the pop-up window.
- Add Port: In the "Selected" box on the right, click Add Port to add multiple ports for the same CVM instance, such as ports 80, 81, and 82.
- Default Port: Enter the "Default Port" first and then select the CVM instance. The port of every CVM instance is the default port.
After these three steps are completed, the TCP listener rule has been configured as shown below:
Step 4. Security group (optional)
You can configure a CLB security group to isolate public network traffic. For more information, see Configuring a CLB Security Group.
Step 5. Modify/delete a listener (optional)
If you need to modify or delete a created listener, click the listener on the "Listener Management" page and select Modify or Delete.