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Help Center/ Cloud Container Engine/ User Guide/ Network/ Service/ LoadBalancer/ Configuring a Blocklist/Trustlist Access Policy for a LoadBalancer Service

Configuring a Blocklist/Trustlist Access Policy for a LoadBalancer Service

Updated on 2025-02-18 GMT+08:00

When using a LoadBalancer Service, you can configure a trustlist or blocklist to specify the IP addresses that are allowed or denied accessing a load balancer listener.

  • Trustlist: Only the IP addresses in the list can access the listener.
  • Blocklist: The IP addresses in the list are not allowed to access the listener.
NOTE:

After the blocklist or trustlist access policy is configured, if you delete the blocklist or trustlist access policy configuration on the CCE console or delete the target annotation from the YAML file, the configuration on the ELB will be retained.

Prerequisites

  • A Kubernetes cluster is available and the cluster version meets the following requirements:
    • v1.23: v1.23.12-r0 or later
    • v1.25: v1.25.7-r0 or later
    • v1.27: v1.27.4-r0 or later
    • v1.28: v1.28.2-r0 or later
    • Other clusters of later versions
  • An IP address group has been created on the ELB console. For details, see Creating an IP Address Group.

Using the CCE Console

  1. Log in to the CCE console and click the cluster name to access the cluster console.
  2. Choose Services & Ingresses in the navigation pane, click the Services tab, and click Create Service in the upper right corner.
  3. Configure Service parameters.

    • Service Name: Enter a service name, for example, service-acl.
    • Service Type: Select LoadBalancer.
    • Service Affinity: Select cluster level or node level as needed. For details about the differences, see externalTrafficPolicy (Service Affinity).
    • Selector: Add a label and click Confirm. The Service will use this label to select pods. You can also click Reference Workload Label to use the label of an existing workload. In the dialog box that is displayed, select a workload and click OK.
    • Load Balancer

      Select a load balancer to be accessed. Only load balancers in the same VPC as the cluster are supported. If no load balancer is available, click Create Load Balancer to create one on the ELB console. Alternatively, select Auto create to create a load balancer. For details about parameter settings, see Table 1.

    • Health Check: defaults to Global health check. You can configure this parameter as needed.
    • Ports
      • Protocol: protocol used by the Service.
      • Service Port: port used by the Service. The port number ranges from 1 to 65535.
      • Container Port: listener port of the workload. For example, Nginx uses port 80 by default.
    • Access Control
      • Inherit ELB Configurations: CCE does not modify the existing access control configurations on the ELB console.
      • Allow all IP addresses: No access control is configured.
      • Trustlist: Only the selected IP address group can access the load balancer.
      • Blocklist: The selected IP address group cannot access the load balancer.
      NOTE:

      For clusters of v1.25.16-r10, v1.27.16-r10, v1.28.15-r0, v1.29.10-r0, v1.30.6-r0, v1.31.1-r0, or later, you can select a maximum of five IP address groups for access control at a time.

  4. Click OK.

Using kubectl

An example YAML file of a Service created using an existing load balancer is as follows:
apiVersion: v1 
kind: Service 
metadata: 
  name: nginx
  annotations:
    kubernetes.io/elb.id: <your_elb_id>                    # Load balancer ID. Replace it with the actual value.
    kubernetes.io/elb.class: performance                   # Load balancer type
    kubernetes.io/elb.acl-id: <your_acl_id>               # ID of an IP address group for accessing a load balancer
    kubernetes.io/elb.acl-status: 'on'                  # Enable access control.
    kubernetes.io/elb.acl-type: 'white'                   # Trustlist for access control
spec:
  selector: 
     app: nginx
  ports: 
  - name: service0 
    port: 80
    protocol: TCP 
    targetPort: 80
  type: LoadBalancer
Table 1 Annotations for ELB access control

Parameter

Type

Description

kubernetes.io/elb.acl-id

String

  • If this parameter is not specified, CCE does not modify access control on the ELB.
  • If this parameter is left empty, all IP addresses are allowed to access the load balancer.
  • If this parameter is set to the IP address group ID of the load balancer, access control is enabled and you need to configure an IP address blocklist or trustlist for the load balancer. Additionally, you need to configure both kubernetes.io/elb.acl-status and kubernetes.io/elb.acl-type.
    NOTE:

    For clusters of v1.25.16-r10, v1.27.16-r10, v1.28.15-r0, v1.29.10-r0, v1.30.6-r0, v1.31.1-r0, or later, you can enter up to five IP address groups and separate them with commas (,).

    How to obtain:

    Log in to the console. In the Service List, choose Networking > Elastic Load Balance. On the Network Console, choose Elastic Load Balance > IP Address Groups and copy the ID of the target IP address group. For details, see Creating an IP Address Group.

kubernetes.io/elb.acl-status

String

This parameter is mandatory when you configure an IP address blocklist or trustlist for a load balancer. Options:

  • on: Access control is enabled.
  • off: Access control is disabled.

kubernetes.io/elb.acl-type

String

This parameter is mandatory when you configure an IP address blocklist or trustlist for a load balancer. Options:

  • black: indicates a blocklist. The selected IP address group cannot access the load balancer.
  • white: indicates a trustlist. Only the selected IP address group can access the load balancer.

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