postgresql - 使用 MetalLB 和 Nginx-Ingress 公开端口 80、443 和 5432 (Postgres)

Question

我正在做一个学校项目，我有裸机 VPS，我正在尝试使用 Postgres 数据库（必须可以从外部访问，即：5432）部署 Web 应用程序（nginx 入口）。我在 Google 和 StackOverflow 上浏览了数十个链接，但实际上没有任何结果 - 我还在Connection refused. Is the server running on host "<>" and accepting TCP/IP connections on port 5432?

我已经通过几个简单的步骤成功部署了 MetalLB：

安装 metallb

kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.9.5/manifests/namespace.yaml
kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.9.5/manifests/metallb.yaml
kubectl create secret generic -n metallb-system memberlist --from-literal=secretkey="$(openssl rand -base64 128)"

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

创建 config.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  namespace: metallb-system
  name: config
data:
  config: |
    address-pools:
    - name: production
      protocol: layer2
      addresses:
      - <VPS-external-IP>-<VPS-external-IP>

创建 LoadBalancer 服务

apiVersion: v1
kind: Service
metadata:
  name: nginx-balancer
  namespace: nginx
spec:
  ports:
  - name: http
    port: 80
    protocol: TCP
    targetPort: 80
  - name: https
    port: 443
    protocol: TCP
    targetPort: 443
  - name: db
    port: 5432
    protocol: TCP
    targetPort: 5432
  selector:
    app: nginx
  type: LoadBalancer

并创建了 Nginx 部署（nginx-deployment.yaml）

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  namespace: nginx
  labels:
    app: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:latest
        ports:
        - containerPort: 80
        - containerPort: 443

现在在runnign之后kubectl apply -f config.yaml，kubectl apply -f nginx-deployment.yaml我能够解决“欢迎使用nginx！” curl <VPS-external-IP>:80 输出：

<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

kubectl get pods 
NAME                                READY   STATUS    RESTARTS   AGE
nginx-deployment-7f8d9cf649-cssrb   1/1     Running   0          117m
nginx-deployment-7f8d9cf649-f7q9w   1/1     Running   0          117m
nginx-deployment-7f8d9cf649-fmntb   1/1     Running   0          117m

kubectl get svc -n nginx
NAME             TYPE           CLUSTER-IP      EXTERNAL-IP    PORT(S)                                     AGE
nginx            ClusterIP      10.108.97.186   <none>         80/TCP,443/TCP                              26m
nginx-balancer   LoadBalancer   10.103.72.75    46.36.38.200   80:32529/TCP,443:30432/TCP,5432:31081/TCP   42m

kubectl get pods -n metallb-system
NAME                          READY   STATUS    RESTARTS   AGE
controller-57c458c998-r78wn   1/1     Running   0          13h
speaker-clr6j                 1/1     Running   0          13h

kubectl get configmap -n metallb-system
NAME               DATA   AGE
config             1      13h
kube-root-ca.crt   1      13h

但真正的问题现在来了。我需要使用 :5432 访问 Postgres 数据库，但老实说，我只是迷失在 Kubernetes 中......

我已经为 Postgres 创建了所有必要的东西，以使其运行，例如：

PersistentVolume 和 PersistentVolumeClaim（我认为这里没有必要分享，因为它只是基本的 PersistentVolume 和 PersistentVolumeClaim yaml）
秘密（我认为这里没有必要分享，因为它只是yaml的基本秘密）
配置映射

apiVersion: v1
kind: ConfigMap
metadata:
  name: postgres-configmap
  namespace: postgres
data:
  POSTGRES_DB: db_production

Postgres 部署

apiVersion: apps/v1
kind: Deployment
metadata:
  name: postgres-deployment
  namespace: postgres
spec:
  replicas: 1
  selector:
    matchLabels:
      app: postgres
  template:
    metadata:
      labels:
        app: postgres  
    spec:
      containers:
      - name: postgres
        image: postgres:latest
        ports:
          - containerPort: 5432
        envFrom:
          - secretRef:
              name: postgres-secrets
          - configMapRef:
              name: postgres-configmap  
        volumeMounts:
        - name: postgres-pv-claim
          mountPath: /var/lib/pgsql/data
      volumes:
      - name: postgres-pv-claim
        persistentVolumeClaim:
          claimName: postgres-pv-claim

当然 - Postgres 服务

apiVersion: v1
kind: Service
metadata:
  name: db
  namespace: postgres
  labels:
    run: postgres
spec:
  selector:
    name: postgres
  ports:
  - port: 5432
    targetPort: 5432
    protocol: TCP

postgres 本身似乎工作。

kubectl get pods -n postgres
NAME                                   READY   STATUS    RESTARTS   AGE
postgres-deployment-74fff7c576-6kb5q   1/1     Running   0          96m

kubectl get svc -n postgres
NAME   TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)    AGE
db     ClusterIP   10.102.5.192   <none>        5432/TCP   93m

kubectl get deployments -n postgres
NAME                  READY   UP-TO-DATE   AVAILABLE   AGE
postgres-deployment   1/1     1            1           94m

kubectl get pv -n postgres
NAME          CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                        STORAGECLASS   REASON   AGE
postgres-pv   1Gi        RWO            Retain           Bound    postgres/postgres-pv-claim   manual                  55m

kubectl get pvc -n postgres
NAME                STATUS   VOLUME        CAPACITY   ACCESS MODES   STORAGECLASS   AGE
postgres-pv-claim   Bound    postgres-pv   1Gi        RWO            manual         55m

（我已经删除并重新创建了很多次（因此为什么这么低的年龄...... :-()）

因此，即使我在 5432 上运行了 postgres/db 服务，并且在 Nginx 上运行了 MetalLB LoadBalancer，它只是不会将 5432 暴露给世界。我会对所有建议感到非常高兴，因为我开始放松一开始的炒作，即设置 Kubernetes 会有多好...... :-)

谢谢你。

更新 31.1.2022

我已经使用 Kubeadm 逐步安装了 Kubernetes，并使用了几个在线教程和官方文档。的输出kubectl version

Client Version: version.Info{Major:"1", Minor:"23", GitVersion:"v1.23.3", GitCommit:"816c97ab8cff8a1c72eccca1026f7820e93e0d25", GitTreeState:"clean", BuildDate:"2022-01-25T21:25:17Z", GoVersion:"go1.17.6", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"23", GitVersion:"v1.23.3", GitCommit:"816c97ab8cff8a1c72eccca1026f7820e93e0d25", GitTreeState:"clean", BuildDate:"2022-01-25T21:19:12Z", GoVersion:"go1.17.6", Compiler:"gc", Platform:"linux/amd64"}

和kubeadm version


kubeadm version: &version.Info{Major:"1", Minor:"23", GitVersion:"v1.23.3", GitCommit:"816c97ab8cff8a1c72eccca1026f7820e93e0d25", GitTreeState:"clean", BuildDate:"2022-01-25T21:24:08Z", GoVersion:"go1.17.6", Compiler:"gc", Platform:"linux/amd64"}

postgresql - 使用 MetalLB 和 Nginx-Ingress 公开端口 80、443 和 5432 (Postgres)

0 回答 0

Related

Reference