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Service Management

Last updated: 2021-08-03 16:47:26

    Introduction

    This document describes how to use Service and Ingress as entry points to expose workloads to external sources.

    Prerequisites

    • You have created an elastic cluster that is in the Running state. For more information, see Creating a cluster.
    • The cluster has an appropriate namespace that is in the Active state.

    Service Types

    Service

    Service defines policies for accessing backend Pods and provides a fixed virtual IP address for access. It also provides load balancing for all requests to Pods.

    Service can be of the following types:

    • Public network access: the public network access Service uses operates in Loadbalance and automatically creates a public network CLB instance. Public IP addresses can access backend Pods.
    • Intra-cluster access: the intra-cluster access Service operates in ClusterIP mode and is used for access within the cluster.
    • VPC private network access: the VPC private network access Service operates in Loadbalance and automatically creates a private network CLB instance. By using annotations:service.kubernetes.io/qcloud-loadbalancer-internal-subnetid: subnet-xxxxxxxx, you can use a private IP address from the VPC private network to access the backend Pod.
    Note:

    When the service type is public network access, ClusterIP of this service is disabled by default. You can add the following annotations in yaml to enable ClusterIP:

    service.kubernetes.io/qcloud-clusterip-loadbalancer-subnetid: #Subnet ID of the service CIDR
    

    Ingress

    Ingress is a collection of rules that allow access to Services of a cluster. You can configure different forwarding rules to allow different URLs to access different Services.

    In order for Ingress resources to operate properly, you must run Ingress-controller. TKE enables the CLB-based l7-lb-controller by default and supports HTTP, HTTPS, and nginx-ingress controllers. You can select Ingress controllers according to your needs.

    Directions

    For more information and instructions, see Service Management and Ingress Management.

    Considerations

    • Creating ClusterIP Service in an elastic cluster uses IP addresses from the Service CIDR. Make sure there are enough IP addresses in the subnet.
      In an elastic cluster, a CLB instance created by the Service binds all ENIs of all Pods within the endpoint.
    • In an elastic cluster, Services only supports CLB instances.
    • To create a Service using an existing CLB, you must ensure that the CLB is not bound to any listener.
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