k8s 折腾笔记

本地 k8s 集群也可以有 LoadBalancer

我们在本地集群做测试，往往被告知，Service Type 不支持 LoadBalancer，需要改用 NodePort 来替来。有没有被郁闷到？

MetalLBopen in new window来拯救！

MetalLB 是裸机 Kubernetes 集群的负载均衡器实现，使用标准路由协议。

前置条件：

安装

根据官方安装指南open in new window，通过 manifest 的方式安装

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

配置第二层模式

参考Layer 2 Configurationopen in new window，我们新建一个 ConfigMap，内容如下

# config.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  namespace: metallb-system
  name: config
data:
  config: |
    address-pools:
    - name: default
      protocol: layer2
      addresses:
        - 192.168.32.64/26

kubectl apply -f config.yaml

等待

kubectl wait --for=condition=Ready pods --all -n metallb-system

# pod/controller-57fd9c5bb-d5z9j condition met
# pod/speaker-6hz2h condition met
# pod/speaker-7pzb4 condition met
# pod/speaker-trr9v condition met

测试

kubectl apply -f whoami.yaml

# mentallb/whoami.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: whoami
  labels:
    app: containous
    name: whoami
spec:
  replicas: 2
  selector:
    matchLabels:
      app: containous
      task: whoami
  template:
    metadata:
      labels:
        app: containous
        task: whoami
    spec:
      containers:
        - name: containouswhoami
          image: containous/whoami
          resources:
          ports:
            - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: whoami
spec:
  ports:
    - name: http
      port: 80
  selector:
    app: containous
    task: whoami
  type: LoadBalancer

查看

kubectl get all

# NAME                          READY   STATUS    RESTARTS   AGE
# pod/whoami-577f459d99-bnnm7   1/1     Running   0          17m
# pod/whoami-577f459d99-j595j   1/1     Running   0          17m

# NAME                 TYPE           CLUSTER-IP      EXTERNAL-IP     PORT(S)        AGE
# service/kubernetes   ClusterIP      10.96.0.1       <none>          443/TCP        3h20m
# service/whoami       LoadBalancer   10.105.186.75   192.168.32.64   80:30465/TCP   17m

# NAME                     READY   UP-TO-DATE   AVAILABLE   AGE
# deployment.apps/whoami   2/2     2            2           17m

# NAME                                DESIRED   CURRENT   READY   AGE
# replicaset.apps/whoami-577f459d99   2         2         2       17m

可见分配的 EXTERNAL-IP 为 192.168.32.64

分别在虚拟机和宿主机试试：

curl 192.168.32.64

# Hostname: whoami-577f459d99-j595j
# IP: 127.0.0.1
# IP: 192.168.235.204
# RemoteAddr: 10.0.2.15:61859
# GET / HTTP/1.1
# Host: 192.168.32.64
# User-Agent: curl/7.64.1
# Accept: */*

如果宿主机配置了网络代理，需要修改 ~/.zshrc 文件，将 192.168.32.64 加入到 no_proxy 中

# 宿主机 ~/.zshrc
 export http_proxy=http://127.0.0.1:7890
 export https_proxy=http://127.0.0.1:7890
 export no_proxy=127.0.0.1,localhost,192.168.0.0/16,172.16.0.0/12,10.0.0.0/8  # basic
 export no_proxy=aliyuncs.com,kubernetes.docker.internal,$no_proxy # docker
 export no_proxy=192.168.32.64,$no_proxy # k8s

# 宿主机
source ~/.zshrc

然后再试

清理

kubectl delete -f whoami.yaml
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