Configuring Timeout for a LoadBalancer Service

LoadBalancer Services allow you to configure timeout, which is the maximum duration for keeping a connection if no request is received from the client. If no request is received during this period, the load balancer closes the connection and establishes a new one with the client when the next request arrives.

Constraints

This feature takes effect only in the following versions:
- v1.19: v1.19.16-r30 or later
- v1.21: v1.21.10-r10 or later
- v1.23: v1.23.8-r10 or later
- v1.25: v1.25.3-r10 or later
The timeout can be configured only for the LoadBalancer Services using dedicated load balancers.
If you delete the timeout configuration during Service update, the timeout configuration on the existing listeners will be retained.

Procedure

Use annotations to configure timeout. The following shows an example:

apiVersion: v1 
kind: Service 
metadata: 
  annotations:
    kubernetes.io/elb.id: <your_elb_id>    # In this example, an existing dedicated load balancer is used. Replace its ID with the ID of your dedicated load balancer.
    kubernetes.io/elb.class: performance  # Load balancer type
    kubernetes.io/elb.keepalive_timeout: '300'  # Timeout setting for client connections
  name: nginx 
spec: 
  ports: 
  - name: service0 
    port: 80
    protocol: TCP 
    targetPort: 80
  selector: 
    app: nginx 
  type: LoadBalancer

**Table 1** Key annotation parameters
Parameter	Mandatory	Type	Description
kubernetes.io/elb.keepalive_timeout	No	Integer	Timeout for client connections. If there are no requests reaching the load balancer after the timeout duration elapses, the load balancer will disconnect the connection with the client and establish a new connection when there is a new request. Value: For TCP listeners, the value ranges from 10 to 4000 (in seconds). The default value is 300. For HTTP, HTTPS, and TERMINATED_HTTPS listeners, the value ranges from 10 to 4000 (in seconds). The default value is 60. For UDP listeners, the value ranges from 10 to 4000 (in seconds). The default value is 300.