k8s裸机安装Service使用LoadBalancer

为什么要安装LoadBalancer支持，因为在裸机（自己的服务器）上安装k8s是没有llb的，只用云服务商的官方才有实现

1、安装metalLB
官网https://metallb.universe.tf/installation/

***最新版是v0.12.1 我们本次使用v0.11.0版，最新版本安装不能正常分配IP

kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.11.0/manifests/namespace.yaml

namespace.yaml 如下

apiVersion: v1
kind: Namespace
metadata:
  name: metallb-system
  labels:
    app: metallb

kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.11.0/manifests/metallb.yaml
 

metallb.yaml 文件如下

apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:
  labels:
    app: metallb
  name: controller
  namespace: metallb-system
spec:
  allowPrivilegeEscalation: false
  allowedCapabilities: []
  allowedHostPaths: []
  defaultAddCapabilities: []
  defaultAllowPrivilegeEscalation: false
  fsGroup:
    ranges:
    - max: 65535
      min: 1
    rule: MustRunAs
  hostIPC: false
  hostNetwork: false
  hostPID: false
  privileged: false
  readOnlyRootFilesystem: true
  requiredDropCapabilities:
  - ALL
  runAsUser:
    ranges:
    - max: 65535
      min: 1
    rule: MustRunAs
  seLinux:
    rule: RunAsAny
  supplementalGroups:
    ranges:
    - max: 65535
      min: 1
    rule: MustRunAs
  volumes:
  - configMap
  - secret
  - emptyDir
---
apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:
  labels:
    app: metallb
  name: speaker
  namespace: metallb-system
spec:
  allowPrivilegeEscalation: false
  allowedCapabilities:
  - NET_RAW
  allowedHostPaths: []
  defaultAddCapabilities: []
  defaultAllowPrivilegeEscalation: false
  fsGroup:
    rule: RunAsAny
  hostIPC: false
  hostNetwork: true
  hostPID: false
  hostPorts:
  - max: 7472
    min: 7472
  - max: 7946
    min: 7946
  privileged: true
  readOnlyRootFilesystem: true
  requiredDropCapabilities:
  - ALL
  runAsUser:
    rule: RunAsAny
  seLinux:
    rule: RunAsAny
  supplementalGroups:
    rule: RunAsAny
  volumes:
  - configMap
  - secret
  - emptyDir
---
apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    app: metallb
  name: controller
  namespace: metallb-system
---
apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    app: metallb
  name: speaker
  namespace: metallb-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    app: metallb
  name: metallb-system:controller
rules:
- apiGroups:
  - ''
  resources:
  - services
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - ''
  resources:
  - services/status
  verbs:
  - update
- apiGroups:
  - ''
  resources:
  - events
  verbs:
  - create
  - patch
- apiGroups:
  - policy
  resourceNames:
  - controller
  resources:
  - podsecuritypolicies
  verbs:
  - use
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    app: metallb
  name: metallb-system:speaker
rules:
- apiGroups:
  - ''
  resources:
  - services
  - endpoints
  - nodes
  verbs:
  - get
  - list
  - watch
- apiGroups: ["discovery.k8s.io"]
  resources:
  - endpointslices
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - ''
  resources:
  - events
  verbs:
  - create
  - patch
- apiGroups:
  - policy
  resourceNames:
  - speaker
  resources:
  - podsecuritypolicies
  verbs:
  - use
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  labels:
    app: metallb
  name: config-watcher
  namespace: metallb-system
rules:
- apiGroups:
  - ''
  resources:
  - configmaps
  verbs:
  - get
  - list
  - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  labels:
    app: metallb
  name: pod-lister
  namespace: metallb-system
rules:
- apiGroups:
  - ''
  resources:
  - pods
  verbs:
  - list
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  labels:
    app: metallb
  name: controller
  namespace: metallb-system
rules:
- apiGroups:
  - ''
  resources:
  - secrets
  verbs:
  - create
- apiGroups:
  - ''
  resources:
  - secrets
  resourceNames:
  - memberlist
  verbs:
  - list
- apiGroups:
  - apps
  resources:
  - deployments
  resourceNames:
  - controller
  verbs:
  - get
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  labels:
    app: metallb
  name: metallb-system:controller
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: metallb-system:controller
subjects:
- kind: ServiceAccount
  name: controller
  namespace: metallb-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  labels:
    app: metallb
  name: metallb-system:speaker
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: metallb-system:speaker
subjects:
- kind: ServiceAccount
  name: speaker
  namespace: metallb-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  labels:
    app: metallb
  name: config-watcher
  namespace: metallb-system
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: config-watcher
subjects:
- kind: ServiceAccount
  name: controller
- kind: ServiceAccount
  name: speaker
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  labels:
    app: metallb
  name: pod-lister
  namespace: metallb-system
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: pod-lister
subjects:
- kind: ServiceAccount
  name: speaker
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  labels:
    app: metallb
  name: controller
  namespace: metallb-system
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: controller
subjects:
- kind: ServiceAccount
  name: controller
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  labels:
    app: metallb
    component: speaker
  name: speaker
  namespace: metallb-system
spec:
  selector:
    matchLabels:
      app: metallb
      component: speaker
  template:
    metadata:
      annotations:
        prometheus.io/port: '7472'
        prometheus.io/scrape: 'true'
      labels:
        app: metallb
        component: speaker
    spec:
      containers:
      - args:
        - --port=7472
        - --config=config
        - --log-level=info
        env:
        - name: METALLB_NODE_NAME
          valueFrom:
            fieldRef:
              fieldPath: spec.nodeName
        - name: METALLB_HOST
          valueFrom:
            fieldRef:
              fieldPath: status.hostIP
        - name: METALLB_ML_BIND_ADDR
          valueFrom:
            fieldRef:
              fieldPath: status.podIP
        # needed when another software is also using memberlist / port 7946
        # when changing this default you also need to update the container ports definition
        # and the PodSecurityPolicy hostPorts definition
        #- name: METALLB_ML_BIND_PORT
        #  value: "7946"
        - name: METALLB_ML_LABELS
          value: "app=metallb,component=speaker"
        - name: METALLB_ML_SECRET_KEY
          valueFrom:
            secretKeyRef:
              name: memberlist
              key: secretkey
        image: quay.io/metallb/speaker:v0.11.0
        name: speaker
        ports:
        - containerPort: 7472
          name: monitoring
        - containerPort: 7946
          name: memberlist-tcp
        - containerPort: 7946
          name: memberlist-udp
          protocol: UDP
        securityContext:
          allowPrivilegeEscalation: false
          capabilities:
            add:
            - NET_RAW
            drop:
            - ALL
          readOnlyRootFilesystem: true
      hostNetwork: true
      nodeSelector:
        kubernetes.io/os: linux
      serviceAccountName: speaker
      terminationGracePeriodSeconds: 2
      tolerations:
      - effect: NoSchedule
        key: node-role.kubernetes.io/master
        operator: Exists
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: metallb
    component: controller
  name: controller
  namespace: metallb-system
spec:
  revisionHistoryLimit: 3
  selector:
    matchLabels:
      app: metallb
      component: controller
  template:
    metadata:
      annotations:
        prometheus.io/port: '7472'
        prometheus.io/scrape: 'true'
      labels:
        app: metallb
        component: controller
    spec:
      containers:
      - args:
        - --port=7472
        - --config=config
        - --log-level=info
        env:
        - name: METALLB_ML_SECRET_NAME
          value: memberlist
        - name: METALLB_DEPLOYMENT
          value: controller
        image: quay.io/metallb/controller:v0.11.0
        name: controller
        ports:
        - containerPort: 7472
          name: monitoring
        securityContext:
          allowPrivilegeEscalation: false
          capabilities:
            drop:
            - all
          readOnlyRootFilesystem: true
      nodeSelector:
        kubernetes.io/os: linux
      securityContext:
        runAsNonRoot: true
        runAsUser: 65534
        fsGroup: 65534
      serviceAccountName: controller
      terminationGracePeriodSeconds: 0

2、增加配置ip池
注意，需要和主机所在同一子网

apiVersion: v1
kind: ConfigMap
metadata:
  namespace: metallb-system
  name: config
data:
  config: |
    address-pools:
    - name: default
      protocol: layer2
      addresses:
      - 192.168.1.220-192.168.1.230

            
3、修改配置

kubectl edit configmap -n kube-system kube-proxy

找到以下节点并修改

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

4、发布一个LoadBalancer的Service

apiVersion: v1
kind: Service
metadata:
  name: nginx
  annotations:
    metallb.universe.tf/address-pool: production-public-ips
spec:
  ports:
  - port: 80
    targetPort: 80
  selector:
    app: nginx
  type: LoadBalancer

 
5、查看servive是否获取到ip

kubectl get svc -n kube-public -o wide

结果如下

NAME        TYPE           CLUSTER-IP   EXTERNAL-IP      PORT(S)        AGE   SELECTOR
nginx-app   LoadBalancer   10.1.42.60   192.168.1.221   80:31818/TCP   19m   app=nginx-app

6、发布一个ingress，成功后会看到loadBalancer节点绑定的ip就是我们service的ip，如下

---
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  annotations:
    kubernetes.io/ingress.class: nginx
  creationTimestamp: '2022-05-28T09:35:38Z'
  generation: 1
  name: ingress-nginxz
  namespace: kube-public
  resourceVersion: '335509'
  selfLink: >-
    /apis/networking.k8s.io/v1beta1/namespaces/kube-public/ingresses/ingress-nginxz
  uid: 9c65fc53-9fda-4c58-8821-bae67efbbcf7
spec:
  rules:
    - host: y.sita.com
      http:
        paths:
          - backend:
              serviceName: nginx-app
              servicePort: 80
            path: /
status:
  loadBalancer:
    ingress:
      - ip: 192.168.1.221

6、把你的域名解析到192.168.1.221 就可以使用这个域名访问了

 
  
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