如何为多个 kubernetes 负载均衡器共享相同的 IP 地址

Question

我正在尝试创建具有相同IP地址的负载均衡器：192.168.1.10 这就是我到目前为止所做的 但是，我收到如下错误消息：

Events:  Type     Reason            Age   From                Message  ----     ------            ----  ----                -------  Warning  AllocationFailed  39m   metallb-controller  Failed to allocate IP for "vpn/service2-loadbalancer": can't change sharing key for "vpn/service2-loadbalancer", address also in use by vpn/service1-loadbalancer

apiVersion: v1
kind: Service
metadata:
  name: service1-loadbalancer
  namespace: vpn
  annotations:
    metallb.universe.tf/allow-shared-ip: 192.168.1.10
  labels:
    app: service1 
spec:
  type: LoadBalancer
  externalTrafficPolicy: Local
  ports:
    - name: udp-port-1
      port: 51820
      protocol: UDP
      targetPort: 51820
    - name: tcp-port-1
      port: 3000
      protocol: TCP
      targetPort: 3000
  selector:
    app: service1
    
  
  # creates TCP 192.168.1.10:3000, UDP 192.168.1.10:51820
  
  
apiVersion: v1
kind: Service
metadata:
  name: service2-loadbalancer
  namespace: vpn
  annotations:
    metallb.universe.tf/allow-shared-ip: 192.168.1.10
  labels:
    app: service2
spec:
  type: LoadBalancer
  externalTrafficPolicy: Local
  ports:
    - name: udp-port-2
      port: 51821
      protocol: UDP
      targetPort: 51821
    - name: tcp-port-2
      port: 3001
      protocol: TCP
      targetPort: 3001
  selector:
    app: service2
    
  
  # expects TCP 192.168.1.10:3001, UDP 192.168.1.10:51821

Answer 1

初始创建MetalLB地址池，示例如下：

apiVersion: metallb.io/v1alpha1
kind: AddressPool
metadata:
  namespace: metallb-system
  name: <address_pool_name>
spec:
  protocol: layer2
  addresses:
  - 1.2.3.4-1.2.3.4

然后使用 metalLB 注释创建您的服务

apiVersion: v1
kind: Service
metadata:
  name: svc1
  annotations:
    metallb.universe.tf/address-pool: <address_pool_name>
spec:
  selector:
    <label_key>: <label_value>
  ports:
    - port: 8080
      targetPort: 8080
      protocol: TCP
  type: LoadBalancer
  loadBalancerIP: 1.2.3.4
---
apiVersion: v1
kind: Service
metadata:
  name: svc2
  annotations:
    metallb.universe.tf/address-pool: <address_pool_name>
spec:
  selector:
    <label_key>: <label_value>
  ports:
    - port: 8080
      targetPort: 8080
      protocol: TCP
  type: LoadBalancer
  loadBalancerIP: 1.2.3.4

您也可以参考以下文档：

• 配置服务以使用 MetalLB

• 配置MetalLB地址池