1.官方链接
https://metallb.universe.tf/concepts/

kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.12.1/manifests/namespace.yaml
kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.12.1/manifests/metallb.yaml

config.yaml的内容如下：

apiVersion: v1
kind: ConfigMap
metadata:
  namespace: metallb-system
  name: config
data:
  config: |
    address-pools:
    - name: dev-public-ips
      protocol: layer2
      addresses:
      - 10.0.2.100-10.0.2.200

其中，dev-public-ips为自定义名称，后面会用到， addresses为自定义地址池

(1) Deployment
nginx-deployment.yaml 的内容如下

root@unode1:~/metallb/example# cat nginx-deployment.yaml 
apiVersion: apps/v1
kind: Deployment      
metadata:
name: pc-deployment
namespace: dev
spec: 
replicas: 3
selector:
  matchLabels:
    app: nginx-pod
template:
  metadata:
    labels:
      app: nginx-pod
  spec:
    containers:
    - name: nginx
      image: nginx:1.17.1
      ports:
      - containerPort: 80

应用Deployment该文件
kubectl apply -f nginx-deployment.yaml
(2) Service

root@unode1:~/metallb/example# cat service-metallb.yaml 
apiVersion: v1
kind: Service
metadata:
  name: nginx
  namespace: dev
  annotations:
    metallb.universe.tf/address-pool: dev-public-ips  #注意，dev-public-ips为config.yaml地址池的名称
spec:
  ports:
  - port: 81   #external ip的端口
    targetPort: 80 # 内部容器端口
  selector:
    app: nginx-pod
  type: LoadBalancer

应用Service文件
kubectl apply -f service-metallb.yaml
(3)参看Service

root@unode1:~/metallb/example# kubectl get svc -n dev
NAME    TYPE           CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
nginx   LoadBalancer   10.109.79.140   10.0.2.101    81:30182/TCP   14h

其中81为EXTERNAL-IP的端口， 30182为node端口， 访问测试如下：
测试1

root@unode1:~/metallb/example# curl 10.0.2.101:81







Welcome to nginx!
If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.

For online documentation and support please refer to
nginx.org.

Commercial support is available at
nginx.com.

Thank you for using nginx.

测试2

root@unode1:~/metallb/example# curl 10.0.2.4:30182  #10.0.2.4为node的ip







Welcome to nginx!
If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.

For online documentation and support please refer to
nginx.org.

Commercial support is available at
nginx.com.

Thank you for using nginx.