Configuring Timeout for a 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

The following table lists the scenarios where timeout can be configured for a Service.

Timeout Type	Load Balancer Type	Restrictions	Cluster Version
Idle timeout	Dedicated	None	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 Other clusters of later versions

If you delete the timeout configuration during a Service update, the timeout configuration on the existing listeners will be retained.

Using kubectl

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	String	Timeout for client connections. If there are no requests reaching the load balancer during the timeout duration, the load balancer will disconnect the connection from 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.