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KubernetesにてLoad balancerを構築

Posted at 2023-05-22

installation

https://metallb.universe.tf/installation/
$ kubectl edit configmap -n kube-system kube-proxy

Enter the text below

apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
mode: "ipvs"
ipvs:
  strictARP: true

以下のコマンドを実行する事によって、上記の設定が出来る。

$ kubectl get configmap kube-proxy -n kube-system -o yaml | \
sed -e "s/strictARP: false/strictARP: true/" | \
kubectl diff -f - -n kube-system

$ kubectl get configmap kube-proxy -n kube-system -o yaml | \
sed -e "s/strictARP: false/strictARP: true/" | \
kubectl apply -f - -n kube-system

$ kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.13.7/config/manifests/metallb-native.yaml

shell scriptでもOK

#!/bin/bash
export KUBECONFIG=/etc/kubernetes/admin.conf
source ~/.bashrc
kubectl get configmap kube-proxy -n kube-system -o yaml | \
sed -e "s/strictARP: false/strictARP: true/" | \
kubectl diff -f - -n kube-system

kubectl get configmap kube-proxy -n kube-system -o yaml | \
sed -e "s/strictARP: false/strictARP: true/" | \
kubectl apply -f - -n kube-system

kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.13.9/config/manifests/metallb-native.yaml

creating congmap, IPAddressPool, L2ADvertisement

apiVersion: v1
kind: ConfigMap
metadata:
  namespace: metallb-system
  name: config
data:
  config: |
    ipaddress-pools:
    - name: default
      protocol: layer2
      addresses:
      - 192.168.0.150-192.168.0.200
      autoAssign: true

apiVersion: metallb.io/v1beta1
kind: IPAddressPool
metadata:
  name: default
  namespace: metallb-system
spec:
  addresses:
  - 192.168.0.150-192.168.0.200
  autoAssign: true
---

creating deployment manifest

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: nginx-metallb
  name: nginx-metallb
spec:
  selector:
    matchLabels:
      app: nginx-metallb
  template:
    metadata:
      labels:
        app: nginx-metallb
    spec:
      containers:
      - image: nginx
        name: nginx-metallb
        ports:
        - containerPort: 80

creating service manifest

apiVersion: v1
kind: Service
metadata:
  labels:
    app: nginx-metallb
  name: nginx-metallb
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: nginx-metallb
  type: LoadBalancer
  #externalIPs:
  #- 172.24.20.61
status:
  loadBalancer: {}

By creating configgmap, IPAddressPool, L2ADvertisement, the IP address of service Loadbalancercan get it without configuration.

Reference Site

coredns設定例

apiVersion: v1
kind: Service
metadata:
  name: coredns-service-tcp
  annotations:
    metallb.universe.tf/allow-shared-ip: "coredns-service-ip"
spec:
  type: LoadBalancer
  loadBalancerIP: 172.16.0.2
  ports:
    - name: tcp
      port: 53
      targetPort: 53
      protocol: TCP
  selector:
    app: coredns
---
apiVersion: v1
kind: Service
metadata:
  name: coredns-service-udp
  annotations:
    metallb.universe.tf/allow-shared-ip: "coredns-service-ip"
spec:
  type: LoadBalancer
  loadBalancerIP: 172.16.0.2
  ports:
    - name: udp
      port: 53
      targetPort: 53
      protocol: UDP
  selector:
    app: coredns

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