自建Kubernetes的LoadBalancer类型服务方案-MetalLB

[TOC]

1. 环境

kubernetes环境：

• kubeadm v1.13.1，网络使用flannel
• helm v2.13.0

2. 安装

helm fetch --untar stable/metallb
cd metallb
vim values.yaml  # 配置ip池
helm install --name metallb --namespce kube-system ./

configInline:
    # Example ARP Configuration
    address-pools:
    - name: default
      protocol: layer2
      addresses:
      - 192.168.105.170-192.168.105.175

3. 使用示例

示例：

nginx-metallb.yaml

apiVersion: apps/v1beta2
kind: Deployment
metadata:
  name: nginx-metallb
spec:
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx
        ports:
        - name: http
          containerPort: 80

---
apiVersion: v1
kind: Service
metadata:
  name: nginx-metallb
spec:
  ports:
  - name: http
    port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: nginx
  type: LoadBalancer

正常结果是可以看到svc的EXTERNAL-IP列有分配IP池中的地址，kubernetes外部也可以访问。

# 访问测试
lb_ip=$(kubectl get svc nginx-metallb -ojsonpath={.status.loadBalancer.ingress[0].ip})
curl $lb_ip

参考链接：
[1] https://metallb.universe.tf/