Using TKEServiceConfig to Configure CLBs

Last updated: 2021-10-13 16:22:42

    TkeServiceConfig

    TkeServiceConfig is a custom resource definition (CRD) provided by TKE to help you manage the various configurations of CLB with an Ingress more flexibly.

    Use cases

    The CLB parameters and features that cannot be defined by the semantics of Ingress YAML can be configured through TkeServiceConfig.

    Configuration description

    TkeServiceConfig helps you quickly configure CLB. You can specify a target configuration for application to an Ingress through the Ingress annotation **ingress.cloud.tencent.com/tke-service-config:&dxlt;config-name&dxgt;**.

    Note:

    The TkeServiceConfig resource needs to be in the same namespace as the Ingress.

    TkeServiceConfig doesn't help you configure and modify the protocol, port, domain name, and forwarding path; instead, you need to describe them in the configuration to specify the forwarding rule for delivery by the configuration.

    There can be multiple domain names under each layer-7 listener and multiple forwarding paths under each domain name. Therefore, you can declare multiple combinations of domain name and forwarding rule configurations in TkeServiceConfig. Currently, configurations are mainly provided for CLB health check and backend access.

    • The configuration can be accurately delivered to the corresponding listener by specifying the protocol and port:
      • spec.loadBalancer.l7Listeners.protocol: layer-7 protocol
      • spec.loadBalancer.l7Listeners.port: listening port
    • By specifying the protocol, port, domain name, and access path, you can set configurations at the forwarding rule level, such as for backend health check and load balancing methods.
      • spec.loadBalancer.l7Listeners.protocol: layer-7 protocol
      • spec.loadBalancer.l7Listeners.port: listening port
      • spec.loadBalancer.l7Listeners.domains[].domain: domain name
      • spec.loadBalancer.l7Listeners.domains[].rules[].url: forwarding path
    Note:

    When your domain name is configured as the default value, i.e., public or private VIP, you can configure by entering a null value in the domain field.

    Association between Ingress and TkeServiceConfig

    1. If you set **ingress.cloud.tencent.com/tke-service-config-auto:&dxlt;true&dxgt;** when creating an Ingress, &dxlt;IngressName>-auto-ingress-config will be created automatically. You can also specify the TkeServiceConfig you created on your own directly through **ingress.cloud.tencent.com/tke-service-config:&dxlt;config-name&dxgt;**. The two annotations cannot be used at the same time.
    2. The name of the custom configuration you use for a Service/Ingress cannot be suffixed with -auto-service-config or -auto-ingress-config.
    3. The automatically created TkeServiceConfig has the following sync behaviors:
      • When a layer-7 forwarding rule is added during Ingress resource update, Ingress-Controller will automatically add the corresponding TkeServiceConfig configuration segment for the rule if it doesn't exist.
      • When a layer-7 forwarding rule is deleted, the Ingress-Controller component will automatically delete the corresponding TkeServiceConfig segment.
      • When an Ingress resource is deleted, the TkeServiceConfig will also be deleted.
      • When you modify the default TkeServiceConfig of the Ingress, the TkeServiceConfig content will also be applied to CLB.
    4. You can also create the desired CLB configuration as instructed in the following TkeServiceConfig configuration reference, which is imported by the Service through the **ingress.cloud.tencent.com/tke-service-config:&dxlt;config-name&dxgt;** annotation.
    5. A manually created TkeServiceConfig has the following sync behaviors:
      • When you use a configuration annotation in the Ingress, CLB will immediately set sync.
      • When you delete a configuration annotation in the Ingress, CLB will remain unchanged.
      • When you modify the TkeServiceConfig configuration, CLB of the Ingress that imports the configuration will set sync based on the new TkeServiceConfig.
      • If the Ingress listener cannot find the corresponding configuration, the listener will not be modified.
      • If the Ingress listener finds the corresponding configuration, but the configuration doesn't contain declared attributes, the listener will not be modified.

    Samples

    Sample deployment: jetty-deployment.yaml

    apiVersion: apps/v1
    kind: Deployment
    metadata:
     labels:
       app: jetty
     name: jetty-deployment
     namespace: default
    spec:
     progressDeadlineSeconds: 600
     replicas: 3
     revisionHistoryLimit: 10
     selector:
       matchLabels:
         app: jetty
     strategy:
       rollingUpdate:
         maxSurge: 25%
         maxUnavailable: 25%
       type: RollingUpdate
     template:
       metadata:
         creationTimestamp: null
         labels:
           app: jetty
       spec:
         containers:
         - image: jetty:9.4.27-jre11
           imagePullPolicy: IfNotPresent
           name: jetty
           ports:
           - containerPort: 80
             protocol: TCP
           - containerPort: 443
             protocol: TCP
           resources: {}
           terminationMessagePath: /dev/termination-log
           terminationMessagePolicy: File
         dnsPolicy: ClusterFirst
         restartPolicy: Always
         schedulerName: default-scheduler
         securityContext: {}
         terminationGracePeriodSeconds: 30
    

    Sample Service: jetty-service.yaml

    apiVersion: v1
    kind: Service
    metadata:
     name: jetty-service
     namespace: default
    spec:
     ports:
     - name: tcp-80-80
       port: 80
       protocol: TCP
       targetPort: 80
     - name: tcp-443-443
       port: 443
       protocol: TCP
       targetPort: 443
     selector:
       app: jetty
     type: NodePort
    

    This sample contains the following configuration:
    Service NodePort type, with two TCP services declared, one on port 80 and the other on port 443.

    Sample Ingress: jetty-ingress.yaml

    apiVersion: extensions/v1beta1
    kind: Ingress
    metadata:
     annotations:
       kubernetes.io/ingress.rule-mix: "true"
       kubernetes.io/ingress.http-rules: '[{"path":"/health","backend":{"serviceName":"jetty-service","servicePort":"80"}}]'
       kubernetes.io/ingress.https-rules: '[{"path":"/","backend":{"serviceName":"jetty-service","servicePort":"443","host":"sample.tencent.com"}}]'
       ingress.cloud.tencent.com/tke-service-config: jetty-ingress-config
       # Specify the existing `tke-service-config`
       # service.cloud.tencent.com/tke-service-config-auto: true 
       # Automatically create a `tke-service-config`
     name: jetty-ingress
     namespace: default
    spec:
     rules:
     - http:
         paths:
         - backend:
             serviceName: jetty-service
             servicePort: 80
           path: /health
     - host: "sample.tencent.com"
       http:
         paths:
         - backend:
             serviceName: jetty-service
             servicePort: 443
           path: /
     tls:
     - secretName: jetty-cert-secret
    

    This sample contains the following configuration:

    • Two different protocols are used together. The default domain name (public IP) is used to expose an HTTP service, and the sample.tencent.com domain name is used to expose an HTTPS service.
    • The forwarding path of the HTTP service is /health, and that of the HTTPS service is /.
    • The jetty-ingress-config CLB configuration is used.

    Sample TkeServiceConfig: jetty-ingress-config.yaml

    apiVersion: cloud.tencent.com/v1alpha1
    kind: TkeServiceConfig
    metadata:
     name: jetty-ingress-config
     namespace: default
    spec:
     loadBalancer:
       l7Listeners:
       - protocol: HTTP
         port: 80
         domains:
         - domain: ""     # When `domain` is null, the VIP is used as the domain name
           rules:
           - url: "/health"
             healthCheck:
               enable: false
       - protocol: HTTPS
         port: 443
         domains:
         - domain: "sample.tencent.com"
           rules:
           - url: "/"
             session:
               enable: true
               sessionExpireTime: 3600
             healthCheck:
               enable: true
               intervalTime: 10
               healthNum: 2
               unHealthNum: 2
               httpCheckPath: "/checkHealth"
               httpCheckDomain: "sample.tencent.com"
               httpCheckMethod: HEAD
             scheduler: WRR
    

    This sample contains the following configuration:
    The name of the TkeServiceConfig is jetty-ingress-config, and in the layer-7 listener configuration, two configuration segments are declared:

    1. The HTTP listener of port 80 will be configured, including the configuration of domain name, which is the default domain name and corresponds to the VIP of CLB.
      The health check feature under the /health path is disabled.
    2. The HTTPS listener of port 443 will be configured, including the configuration of domain name, which is sample.tencent.com. Under this domain name, only a forwarding rule configuration with the forwarding path of / is described, which contains the following:
      • The health check feature is enabled, with the health check interval set to 10s, the healthy threshold to 2 times, and the unhealthy threshold also to 2 times, health checks are performed through HEAD requests, the check path is /checkHealth, and the check domain name is sample.tencent.com.
      • The session persistence feature is enabled, with the timeout period set to 3,600s.
      • The forwarding policy is configured as "weighted round robin".

    kubectl configuration commands

    ➜ kubectl apply -f jetty-deployment.yaml
    ➜ kubectl apply -f jetty-service.yaml
    ➜ kubectl apply -f jetty-ingress.yaml
    ➜ kubectl apply -f jetty-ingress-config.yaml
    ➜ kubectl get pods
    NAME                                READY   STATUS    RESTARTS   AGE
    jetty-deployment-8694c44b4c-cxscn   1/1     Running   0          8m8s
    jetty-deployment-8694c44b4c-mk285   1/1     Running   0          8m8s
    jetty-deployment-8694c44b4c-rjrtm   1/1     Running   0          8m8s
    # Get the `TkeServiceConfig` configuration list
    ➜ kubectl get tkeserviceconfigs.cloud.tencent.com
    NAME                   AGE
    jetty-ingress-config   52s
    # Update and modify the `TkeServiceConfig` configuration
    ➜ kubectl edit tkeserviceconfigs.cloud.tencent.com jetty-ingress-config
    tkeserviceconfigs.cloud.tencent.com/jetty-ingress-config edited