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我创建了一个使用 Google Cloud PostgreSQL 的示例 Rails 5 应用程序。我可以使用 本地运行该应用程序docker-compose up，但是当我将其部署到 GCP 时，我无法远程连接到它。我试图在他们使用的地方复制https://cloud.google.com/ruby/tutorials/bookshelf-on-kubernetes-enginetargetPort: http-server

rails 应用程序发布在 Github 上。我在做任何明显错误的事情吗？:-|

在本地运行应用程序有效

git clone git@github.com:stabenfeldt/k8s-colors.git
docker-compose up -d
docker-compose run colors rake db:create db:migrate
open http://localhost:3000

创建 GKE 集群

gcloud container clusters create color-cluster --num-nodes=2

设置 PostgreSQL 云 SQL

我按照https://cloud.google.com/sql/docs/postgres/connect-kubernetes-engine?authuser=1中的说明 使用这些值更新了我的 config/database.yml 和 k8s/colors.yml。

已部署但卡在 ContainerCreating

kubectl apply -f k8s/colors.yml
kubectl get pods

NAME                    READY     STATUS              RESTARTS   AGE
colors-d9f744dc-d5l5v   0/2       ContainerCreating   0          5m
colors-d9f744dc-spmws   0/2       ContainerCreating   0          5m


kubectl logs d9f744dc-d5l5v -c colors  # => Nothing logged

kubectl 获取部署

NAME      DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
colors    2         2         2            0           7m

但无法连接到应用程序

kubectl get svc
NAME         TYPE           CLUSTER-IP      EXTERNAL-IP      PORT(S)        AGE
colors       LoadBalancer   10.55.245.192   35.228.111.217   80:30746/TCP   1h
kubernetes   ClusterIP      10.55.240.1     <none>           443/TCP        1h

curl 35.228.111.217 # => 没有反应！：-/

kubectl 描述 svc 颜色

Name:                     colors
Namespace:                default
Labels:                   <none>
Annotations:              kubectl.kubernetes.io/last-applied-configuration={"apiVersion":"v1","kind":"Service","metadata":{"annotations":{},"name":"colors","namespace":"default"},"spec":{"ports":[{"port":80,"targetPort":3000}]...
Selector:                 app=colors
Type:                     LoadBalancer
IP:                       10.55.252.91
LoadBalancer Ingress:     35.228.203.46
Port:                     <unset>  80/TCP
TargetPort:               3000/TCP
NodePort:                 <unset>  30964/TCP
Endpoints:                <none>
Session Affinity:         None
External Traffic Policy:  Cluster
Events:
  Type    Reason                Age   From                Message
  ----    ------                ----  ----                -------
  Normal  Type                  1m    service-controller  ClusterIP -> LoadBalancer
  Normal  EnsuringLoadBalancer  1m    service-controller  Ensuring load balancer
  Normal  EnsuredLoadBalancer   30s   service-controller  Ensured load balancer

k8s/service.yml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: colors
  labels:
    app: colors

spec:
  replicas: 2
  selector:
    matchLabels:
      app: colors
  template:
    metadata:
      labels:
        app: colors
    spec:
      containers:
        - name: colors
          image: docker.io/stabenfeldt/colors:latest
          ports:
            - name: http-server
              containerPort: 3000


          env:
            - name: POSTGRES_HOST
              value: 127.0.0.1:5432
            - name: POSTGRES_USER
              valueFrom:
                secretKeyRef:
                  name: cloudsql-db-credentials
                  key: username
            - name: POSTGRES_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: cloudsql-db-credentials
                  key: password

        - name: cloudsql-proxy
          image: gcr.io/cloudsql-docker/gce-proxy:1.11
          command: ["/cloud_sql_proxy",
                    "-instances=PROJECT_ID:europe-west1:staging=tcp:5432",
                    "-credential_file=/secrets/cloudsql/credentials.json"]
          volumeMounts:
            - name: cloudsql-instance-credentials
              mountPath: /secrets/cloudsql
              readOnly: true

      volumes:
        - name: cloudsql-instance-credentials
          secret:
            secretName: cloudsql-instance-credentials

---


apiVersion: v1
kind: Service
metadata:
  name: colors
spec:
  type: LoadBalancer
  ports:
  - port: 80
    targetPort: 3000
  selector:
    app: colors

kubectl 描述部署

Name:                   colors
Namespace:              default
CreationTimestamp:      Fri, 13 Jul 2018 10:37:06 +0200
Labels:                 app=colors
Annotations:            deployment.kubernetes.io/revision=1
                        kubectl.kubernetes.io/last-applied-configuration={"apiVersion":"apps/v1","kind":"Deployment","metadata":{"annotations":{},"labels":{"app":"colors"},"name":"colors","namespace":"default"},"spec":{"repl...
Selector:               app=colors
Replicas:               2 desired | 2 updated | 2 total | 0 available | 2 unavailable
StrategyType:           RollingUpdate
MinReadySeconds:        0
RollingUpdateStrategy:  25% max unavailable, 25% max surge
Pod Template:
  Labels:  app=colors
  Containers:
   colors:
    Image:  docker.io/stabenfeldt/colors:latest
    Port:   3000/TCP
    Environment:
      POSTGRES_HOST:      127.0.0.1:5432
      POSTGRES_USER:      <set to the key 'username' in secret 'cloudsql-db-credentials'>  Optional: false
      POSTGRES_PASSWORD:  <set to the key 'password' in secret 'cloudsql-db-credentials'>  Optional: false
    Mounts:               <none>
   cloudsql-proxy:
    Image:  gcr.io/cloudsql-docker/gce-proxy:1.11
    Port:   <none>
    Command:
      /cloud_sql_proxy
      -instances=MY-INSTANCE:europe-west1:staging=tcp:5432
      -credential_file=/secrets/cloudsql/credentials.json
    Environment:  <none>
    Mounts:
      /secrets/cloudsql from cloudsql-instance-credentials (ro)
  Volumes:
   cloudsql-instance-credentials:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  cloudsql-instance-credentials
    Optional:    false
Conditions:
  Type           Status  Reason
  ----           ------  ------
  Available      False   MinimumReplicasUnavailable
  Progressing    True    ReplicaSetUpdated
OldReplicaSets:  <none>
NewReplicaSet:   colors-d9f744dc (2/2 replicas created)
Events:
  Type    Reason             Age   From                   Message
  ----    ------             ----  ----                   -------
  Normal  ScalingReplicaSet  1m    deployment-controller  Scaled up replica set colors-d9f744dc to 2

kubectl 描述服务

Name:                     colors
Namespace:                default
Labels:                   <none>
Annotations:              kubectl.kubernetes.io/last-applied-configuration={"apiVersion":"v1","kind":"Service","metadata":{"annotations":{},"name":"colors","namespace":"default"},"spec":{"ports":[{"port":80,"targetPort":3000}]...
Selector:                 app=colors
Type:                     LoadBalancer
IP:                       10.55.252.91
LoadBalancer Ingress:     35.228.203.46
Port:                     <unset>  80/TCP
TargetPort:               3000/TCP
NodePort:                 <unset>  30964/TCP
Endpoints:                <none>
Session Affinity:         None
External Traffic Policy:  Cluster
Events:
  Type    Reason                Age   From                Message
  ----    ------                ----  ----                -------
  Normal  Type                  4m    service-controller  ClusterIP -> LoadBalancer
  Normal  EnsuringLoadBalancer  4m    service-controller  Ensuring load balancer
  Normal  EnsuredLoadBalancer   3m    service-controller  Ensured load balancer


Name:              kubernetes
Namespace:         default
Labels:            component=apiserver
                   provider=kubernetes
Annotations:       <none>
Selector:          <none>
Type:              ClusterIP
IP:                10.55.240.1
Port:              https  443/TCP
TargetPort:        443/TCP
Endpoints:         35.228.79.249:443
Session Affinity:  ClientIP
Events:            <none>
4

3 回答 3

1

我看不出有什么问题，但这里有一些技巧可以验证你的 Kubernetes 对象与你的 yaml 相比看起来应该是怎样的：

使用describe命令获取有关对象的更多信息并确保它们设置正确。

例如，如果您这样做，kubectl describe deployment <deployment_name>您应该验证以下行是否存在：

Port:       3000/TCP

并为您的服务 - kubectl describe service <service_name>：

LoadBalancer Ingress:     <PUBLIC_IP>
Port:                     <unset>  80/TCP
TargetPort:               3000/TCP

最后，我不确定您是否要在 LoadBalancer 中应用以下内容：

  labels:
    app: colors

由于您将此标签用作选择器，因此它可能正在做一些时髦的事情并尝试对自身进行负载平衡，而不是对其中包含应用程序的容器进行负载平衡。

另外作为术语的旁注，GCP（Google Cloud Platform）是 Google 服务的总称，GKE（Google Kubernetes Engine）是为您提供托管 Kuberenetes 集群的服务。

希望这可以帮助。

于 2018-07-12T20:01:50.673 回答
0

您的 POSTGRES_HOST 环境变量需要是localhost而不是127.0.0.01:5432。您不需要在 POSTGRES_HOST 中添加端口

于 2018-08-22T19:28:39.710 回答
0

我在 Github 上的示例 Rails 应用程序中可以有一个工作设置。

k8s/colors.yml

# Remember to update MY-INSTANCE

apiVersion: v1
kind: Service
metadata:
  name: colors-frontend
  labels:
    app: colors
    tier: frontend
spec:
  type: LoadBalancer
  ports:
  - port: 80
    targetPort: http-server
  selector:
    app: colors
    tier: frontend

---

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: colors-frontend
  labels:
    app: colors
    tier: frontend
spec:
  replicas: 3
  template:
    metadata:
      labels:
        app: colors
        tier: frontend
    spec:
      volumes:
        - name: cloudsql-instance-credentials
          secret:
            secretName: cloudsql-instance-credentials

      containers:
        - name: cloudsql-proxy
          image: gcr.io/cloudsql-docker/gce-proxy:1.11
          command: ["/cloud_sql_proxy",
                    "-instances=MY-INSTANCE:europe-west1:development=tcp:5432",
                    "-credential_file=/secrets/cloudsql/credentials.json"]
          volumeMounts:
              - name: cloudsql-instance-credentials
                mountPath: /secrets/cloudsql
                readOnly: true


        - name: colors-app
          image: docker.io/stabenfeldt/colors:1
          imagePullPolicy: Always

          env:
            - name: RAILS_LOG_TO_STDOUT
              value: "true"
            - name: RAILS_ENV
              value: development
            - name: POSTGRES_HOST
              value: 127.0.0.1
            - name: POSTGRES_USERNAME
              valueFrom:
                secretKeyRef:
                  name: cloudsql-db-credentials
                  key: username
            - name: POSTGRES_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: cloudsql-db-credentials
                  key: password

          ports:
          - name: http-server
            containerPort: 3000
于 2018-07-18T11:53:50.567 回答