Configuring a LoadBalancer Ingress Using Annotations

By adding annotations to a YAML file, you can implement more advanced ingress functions. This section describes the annotations that can be used when you create a LoadBalancer ingress.

Interconnection with ELB
Configuring ELB Certificates
Configuring Timeout for an Ingress
Configuring a Custom Listening Port

Interconnection with ELB

**Table 1** Annotations for interconnecting with ELB
Parameter	Type	Description	Supported Cluster Version
kubernetes.io/elb.class	String	Select a proper load balancer type. performance: dedicated load balancer	v1.9 or later
kubernetes.io/ingress.class	String	cce: A proprietary LoadBalancer ingress is used. nginx: Nginx ingress is used. This parameter is mandatory when an ingress is created by calling the API. For clusters of v1.23 or later, use the parameter ingressClassName. For details, see Using kubectl to Create a LoadBalancer Ingress.	Only clusters of v1.21 or earlier
kubernetes.io/elb.port	String	This parameter indicates the external port registered with the address of the LoadBalancer Service. The value ranges from 1 to 65535. NOTE: Some ports are high-risk ports and are blocked by default, for example, port 21.	v1.9 or later
kubernetes.io/elb.id	String	Mandatory when an existing load balancer is to be interconnected. ID of a load balancer. How to obtain: On the management console, click Service List, and choose Networking > Elastic Load Balance. Click the name of the target load balancer. On the Summary tab page, find and copy the ID.	v1.9 or later
kubernetes.io/elb.ip	String	Mandatory when an existing load balancer is to be interconnected. Service address of a load balancer. The value can be the public IP address of a public network load balancer or the private IP address of a private network load balancer.	v1.9 or later
kubernetes.io/elb.autocreate	Table 5 Object	Mandatory when load balancers are automatically created. Example If a public network load balancer will be automatically created, set this parameter to the following value: '{"type":"public","bandwidth_name":"cce-bandwidth-1551163379627","bandwidth_chargemode":"bandwidth","bandwidth_size":5,"bandwidth_sharetype":"PER","eip_type":"5_bgp","name":"james"}' If a private network load balancer will be automatically created, set this parameter to the following value: {"type":"inner","name":"A-location-d-test"}	v1.9 or later
kubernetes.io/elb.subnet-id	String	Optional when load balancers are automatically created. ID of the subnet where the cluster is located. The value can contain 1 to 100 characters. Mandatory when a cluster of v1.11.7-r0 or earlier is to be automatically created. Optional for clusters later than v1.11.7-r0.	Mandatory for clusters earlier than v1.11.7-r0 Discarded in clusters later than v1.11.7-r0

The following shows how to use the preceding annotations:

Associate an existing load balancer. For details, see Creating an Ingress - Interconnecting with an Existing Load Balancer.
Automatically create a load balancer. For details, see Creating an Ingress - Automatically Creating a Load Balancer.

Configuring ELB Certificates

**Table 2** ELB certificate annotations
Parameter	Type	Description	Supported Cluster Version
kubernetes.io/elb.tls-certificate-ids	String	ELB certificate IDs, which are separated by comma (,). The list length is greater than or equal to 1. The first ID in the list is the server certificate, and the other IDs are SNI certificates in which a domain name must be contained. To obtain the certificate, log in to the CCE console, choose Service List > Networking > Elastic Load Balance, and click Certificates in the navigation pane. In the load balancer list, copy the ID under the target certificate name.	v1.19.16-r2, v1.21.5-r0, v1.23.3-r0, or later

For details, see Using the ELB Certificate.

Configuring Timeout for an Ingress

**Table 3** Annotations of configuring ingress redirection rules
Parameter	Type	Description	Supported Cluster Version
kubernetes.io/elb.keepalive_timeout	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 or HTTPS listeners, the value ranges from 0 to 4000 (in seconds). The default value is 60. For UDP listeners, this parameter does not take effect.	Dedicated load balancers: v1.19.16-r30, v1.21.10-r10, v1.23.8-r10, v1.25.3-r10, or later Shared load balancers: v1.23.13-r0, v1.25.8-r0, v1.27.5-r0, v1.28.3-r0, or later
kubernetes.io/elb.client_timeout	String	Timeout for waiting for a request from a client. There are two cases: If the client fails to send a request header to the load balancer during the timeout duration, the request will be interrupted. If the interval between two consecutive request bodies reaching the load balancer is greater than the timeout duration, the connection will be disconnected. The value ranges from 1 to 300 (in seconds). The default value is 60. This parameter is available only for HTTP and HTTPS listeners. Minimum value: 1 Maximum value: 300 Default value: 60	Dedicated load balancers: v1.19.16-r30, v1.21.10-r10, v1.23.8-r10, v1.25.3-r10, or later Shared load balancers: v1.23.13-r0, v1.25.8-r0, v1.27.5-r0, v1.28.3-r0, or later
kubernetes.io/elb.member_timeout	String	Timeout for waiting for a response from a backend server. After a request is forwarded to the backend server, if the backend server does not respond within the duration specified by member_timeout, the load balancer will stop waiting and return HTTP 504 Gateway Timeout. The value ranges from 1 to 300 (in seconds). The default value is 60. This parameter is available only for HTTP and HTTPS listeners. Minimum value: 1 Maximum value: 300 Default value: 60	Dedicated load balancers: v1.19.16-r30, v1.21.10-r10, v1.23.8-r10, v1.25.3-r10, or later Shared load balancers: v1.23.13-r0, v1.25.8-r0, v1.27.5-r0, v1.28.3-r0, or later

For details, see Configuring Timeout for a LoadBalancer Ingress.

Configuring a Custom Listening Port

A custom listening port can be configured for an ingress. In this way, both ports 80 and 443 can be exposed.

**Table 4** Annotations for a custom listening port
Parameter	Type	Description	Supported Cluster Version
kubernetes.io/elb.listen-ports	String	Create multiple listening ports for an ingress. The port number ranges from 1 to 65535. The following is an example for JSON characters: kubernetes.io/elb.listen-ports: '[{"HTTP":80},{"HTTPS":443}]' Only the listening ports that comply with both HTTP and HTTPS are allowed. Only newly created ingresses are allowed. Additionally, after multiple listening ports are configured, annotations cannot be modified or deleted. If both kubernetes.io/elb.listen-ports and kubernetes.io/elb.port are configured, kubernetes.io/elb.listen-ports takes a higher priority. Ingress configuration items such as the blocklist, trustlist, and timeout concurrently take effect on multiple listening ports. Advanced forwarding policies are not supported.	v1.23.14-r0, v1.25.9-r0, v1.27.6-r0, v1.28.4-r0, or later

For example, if an existing ELB is used, the configuration is as follows:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    kubernetes.io/elb.id: 2c623150-17bf-45f1-ae6f-384b036f547e     # ID of an existing load balancer
    kubernetes.io/elb.class: performance    # Load balancer type
    kubernetes.io/elb.listen-ports: '[{"HTTP": 80},{"HTTPS": 443}]'    # Multi-listener configuration
    kubernetes.io/elb.tls-certificate-ids: 6cfb43c9de1a41a18478b868e34b0a82,6cfb43c9de1a41a18478b868e34b0a82   # HTTPS certificate configuration
  name: test-https
  namespace: default
spec:
  ingressClassName: cce
  rules:
  - host: xxx.com
    http:
      paths:
      - backend:
          service:
            name: test
            port:
              number: 8888
        path: /
        pathType: ImplementationSpecific
        property:
          ingress.beta.kubernetes.io/url-match-mode: STARTS_WITH

Parameters for Automatically Creating a Load Balancer

**Table 5** elb.autocreate data structure
Parameter	Mandatory	Type	Description
name	No	String	Name of the automatically created load balancer. The value can contain 1 to 64 characters. Only letters, digits, underscores (_), hyphens (-), and periods (.) are allowed. Default: cce-lb+service.UID
type	No	String	Network type of the load balancer. public: public network load balancer inner: private network load balancer Default: inner
bandwidth_name	Yes for public network load balancers	String	Bandwidth name. The default value is cce-bandwidth-******. The value can contain 1 to 64 characters. Only letters, digits, underscores (_), hyphens (-), and periods (.) are allowed.
bandwidth_chargemode	No	String	Bandwidth mode. bandwidth: billed by bandwidth traffic: billed by traffic Default: bandwidth
bandwidth_size	Yes for public network load balancers	Integer	Bandwidth size. The default value is 1 to 2000 Mbit/s. Configure this parameter based on the bandwidth range allowed in your region. The minimum increment for bandwidth adjustment varies depending on the bandwidth range. The minimum increment is 1 Mbit/s if the allowed bandwidth does not exceed 300 Mbit/s. The minimum increment is 50 Mbit/s if the allowed bandwidth ranges from 300 Mbit/s to 1000 Mbit/s. The minimum increment is 500 Mbit/s if the allowed bandwidth exceeds 1000 Mbit/s.
bandwidth_sharetype	Yes for public network load balancers	String	Bandwidth sharing mode. PER: dedicated bandwidth
eip_type	Yes for public network load balancers	String	EIP type. 5_bgp: dynamic BGP The specific type varies with regions. For details, see the EIP console.
vip_subnet_cidr_id	No	String	Subnet where a load balancer is located. The subnet must belong to the VPC where the cluster resides. If this parameter is not specified, the ELB load balancer and the cluster are in the same subnet. This field can be specified only for clusters of v1.21 or later.
vip_address	No	String	Private IP address of the load balancer. Only IPv4 addresses are supported. The IP address must be in the ELB CIDR block. If this parameter is not specified, an IP address will be automatically assigned from the ELB CIDR block. This parameter is available only in clusters of v1.23.11-r0, v1.25.6-r0, v1.27.3-r0, or later versions.
available_zone	Yes	Array of strings	AZ where the load balancer is located. This parameter is available only for dedicated load balancers.
l4_flavor_name	Yes	String	Flavor name of the layer-4 load balancer. This parameter is available only for dedicated load balancers.
l7_flavor_name	No	String	Flavor name of the layer-7 load balancer. This parameter is available only for dedicated load balancers. The value of this parameter must be the same as that of l4_flavor_name, that is, both are elastic specifications or fixed specifications.
elb_virsubnet_ids	No	Array of strings	Subnet where the backend server of the load balancer is located. If this parameter is left blank, the default cluster subnet is used. Load balancers occupy different number of subnet IP addresses based on their specifications. Do not use the subnet CIDR blocks of other resources (such as clusters and nodes) as the load balancer CIDR block. This parameter is available only for dedicated load balancers. Example: "elb_virsubnet_ids": [ "14567f27-8ae4-42b8-ae47-9f847a4690dd" ]