Configure IP Address Pools Using Eip

This document describes how to configure an Eip object, which functions as an IP address pool for OpenELB in BGP mode, Layer 2 mode, and VIP mode.

OpenELB assigns IP addresses in Eip objects to LoadBalancer Services in the Kubernetes cluster.

Configure an Eip Object for OpenELB

You can create an Eip object to provide an IP address pool for OpenELB. The following is an example of the Eip YAML configuration:

apiVersion: network.kubesphere.io/v1alpha2
kind: Eip
metadata:
    name: eip-sample-pool
    annotations:
      eip.openelb.kubesphere.io/is-default-eip: "true"
spec:
    address: 192.168.0.91-192.168.0.100
    priority: 100
    namespaces:
      - test
      - default
    namespaceSelector:
      kubesphere.io/workspace: workspace
    disable: false
    protocol: layer2
    interface: eth0
    # interface: can_reach:192.168.0.1
status:
    occupied: false
    usage: 1
    poolSize: 10
    used: 
      "192.168.0.91": "default/test-svc"
    firstIP: 192.168.0.91
    lastIP: 192.168.0.100
    ready: true
    v4: true

The fields are described as follows:

metadata:

• name: Name of the Eip object.

• annotations:

  • eip.openelb.kubesphere.io/is-default-eip: Whether the current Eip object is the default Eip object. The value can be "true" or "false". For each Kubernetes cluster, you can set only one Eip object as the default Eip object. The default Eip is used to automatically allocate ips for loadbalancer type services.

spec:

• address: One or more IP addresses, which will be used by OpenELB. The value format can be:

  • IP address, for example, 192.168.0.100.
  • IP address/Subnet mask, for example, 192.168.0.0/24.
  • IP address 1-IP address 2, for example, 192.168.0.91-192.168.0.100.

  NOTE

  IP segments in different Eip objects cannot overlap. Otherwise, a resource creation error will occur.

• priority: Represents the priority of the Eip when automatically assigning an IP address. When multiple Eips are allocated to a single namespace, they are sorted by priority when being automatically assigned. It is a numerical value, where smaller numbers indicate higher priority. The default value is 0.

• namespaces: Specifies which namespaces can use this Eip for automatic IP address assignment through the names of the namespaces. This is defined as a list of names.

• namespaceSelector: Selects which namespaces can use this Eip for automatic IP address assignment through a labelSelector. This is specified as a map.

• disable: Specifies whether the Eip object is disabled. The value can be:

  • false: OpenELB can assign IP addresses in the Eip object to new LoadBalancer Services.
  • true: OpenELB stops assigning IP addresses in the Eip object to new LoadBalancer Services. Existing Services are not affected.

• protocol: Specifies which mode of OpenELB the Eip object is used for. The value can be bgp, layer2, or vip. If this field is not specified, the default value bgp is used.

• interface: NIC on which OpenELB listens for ARP or NDP requests. This field must be set when the protocol field is set to either layer2 or vip modes.

  TIP

  If the NIC names of the Kubernetes cluster nodes are different, you can set the value to can_reach:IP address (for example, can_reach:192.168.0.1) so that OpenELB automatically obtains the name of the NIC that can reach the IP address. In this case, you must ensure that the IP address is not used by Kubernetes cluster nodes but can be reached by the cluster nodes.Also, do not use addresses configured in Eips here.

status: Fields under status specify the status of the Eip object and are automatically configured. When creating an Eip object, you do not need to configure these fields.

• occupied: Specifies whether IP addresses in the Eip object have been used up.

• usage: Specifies how many IP addresses in the Eip object have been assigned to Services.

• used: Specifies the used IP addresses and the Services that use the IP addresses. The Services are displayed in the Namespace/Service name format (for example, default/test-svc).

• poolSize: Total number of IP addresses in the Eip object.

• firstIP: First IP address in the Eip object.

• lastIP: Last IP address in the Eip object.

• v4: Specifies whether the address family is IPv4. Currently, OpenELB supports only IPv4 and the value can only be true.

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