K8S MetalLB 安装

原创

yoda221 2024-02-26 21:08:36 ©著作权

文章标签 负载均衡 k8s 文章分类 运维

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一、说明

k8s集群没有4层负载均衡，对外暴露服务时，只能使用NodePort，一方面节点地址有限，另一方面，需要记不同的端口号，还是比较麻烦的。云上一般云提供商会有现成的负载均衡（如阿里云的SLB）可供使用，但是自建K8S集群就需要自己搭建负载均衡了，目前自建K8S集群常用的负载均衡主要是MetalLB。

二、安装

搭建好K8S集群
ipvs开启严格arp模式

[root@master01 ~]# kubectl edit configmap -n kube-system kube-proxy
……
    ipvs:
      excludeCIDRs: null
      minSyncPeriod: 0s
      scheduler: ""
      strictARP: true    #这里要改为true
      syncPeriod: 0s
      tcpFinTimeout: 0s
      tcpTimeout: 0s
      udpTimeout: 0s
……

安装

[root@master01 ~]# mkdir -p $HOME/metallb && cd $_
[root@master01 ~]# wget https://raw.githubusercontent.com/metallb/metallb/v0.13.10/config/manifests/metallb-native.yaml
[root@master01 ~]# kubectl apply -f metallb-native.yaml
[root@master01 ~]# kubectl get pods -n metallb-system
NAME                          READY   STATUS    RESTARTS       AGE
controller-5bc7d4b8b4-mj8kv   1/1     Running   0              4d21h
speaker-6hjpw                 1/1     Running   1 (8d ago)     111d
speaker-959ph                 1/1     Running   0              111d
speaker-jr2b4                 1/1     Running   0              111d
speaker-lpg88                 1/1     Running   2 (6d4h ago)   111d
speaker-wrqlb                 1/1     Running   0              111d

配置地址池

apiVersion: metallb.io/v1beta1
kind: IPAddressPool
metadata:
  name: layer2-pool
  namespace: metallb-system
spec:
  addresses:
  - 192.168.17.60-192.168.17.254
---
apiVersion: metallb.io/v1beta1
kind: L2Advertisement
metadata:
  name: layer2-lb
  namespace: metallb-system
spec:
  ipAddressPools:
  - layer2-pool

测试

[root@master01 metallb]# cat nginx.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-app
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.21.4
        ports:
        - name: http
          containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: nginx-svc
spec:
  ports:
  - name: http
    port: 8080
    protocol: TCP
    targetPort: 80
  selector:
    app: nginx
  type: LoadBalancer
[root@master01 metallb]# kubectl get svc nginx-svc
NAME        TYPE           CLUSTER-IP      EXTERNAL-IP     PORT(S)          AGE
nginx-svc   LoadBalancer   10.233.46.159   192.168.17.61   8080:30503/TCP   111d