如何让一个吊舱连接到Kubernetes的另一个吊舱? (SIMPLE)

时间:2018-05-06 03:04:23

标签: networking deployment kubernetes containers web-deployment

我一直在打开和关闭这堵墙一段时间。网上有大量关于Kubernetes的信息,但是所有人都知道像我这样的n00b并不是真的有很多东西可以继续下去。

那么,任何人都可以共享以下(作为yaml文件)的简单示例吗?我想要的只是

  • 两个豆荚
  • 让我们说一个pod有一个后端(我不知道 - node.js),还有一个有前端(比如React)。
  • 一种在他们之间建立联系的方式。

然后是从后面到前面调用api调用的示例。

我开始研究这种事情,突然间我点击了这个页面 - https://kubernetes.io/docs/concepts/cluster-administration/networking/#how-to-achieve-this。这是超级无益的。我不想要或不需要高级网络策略,也没有时间浏览映射在kubernetes之上的几个不同的服务层。我只是想弄清楚网络请求的一个简单例子。

希望如果此示例存在于stackoverflow上,它也将为其他人服务。

任何帮助将不胜感激。感谢。

编辑; 看起来最简单的示例可能是使用Ingress控制器。

编辑编辑;

我正努力尝试部署一个最小的示例 - 我将在此处完成一些步骤并指出我的问题。

以下是我的yaml文件:

apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: frontend
  labels:
    app: frontend
spec:
  replicas: 3
  selector:
    matchLabels:
      app: frontend
  template:
    metadata:
      labels:
        app: frontend
    spec:
      containers:
      - name: nginx
        image: patientplatypus/frontend_example
        ports:
        - containerPort: 3000
---
apiVersion: v1
kind: Service
metadata:
  name: frontend
spec:
  type: LoadBalancer
  selector:
    app: frontend
  ports:
    - protocol: TCP
      port: 80
      targetPort: 3000
---
apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: backend
  labels:
    app: backend
spec:
  replicas: 3
  selector:
    matchLabels:
      app: backend
  template:
    metadata:
      labels:
        app: backend
    spec:
      containers:
      - name: nginx
        image: patientplatypus/backend_example
        ports:
        - containerPort: 5000
---
apiVersion: v1
kind: Service
metadata:
  name: backend
spec:
  type: LoadBalancer
  selector:
    app: backend
  ports:
    - protocol: TCP
      port: 80
      targetPort: 5000
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: frontend
spec:      
  rules:
  - host: www.kubeplaytime.example
    http:
      paths:
      - path: /
        backend:
          serviceName: frontend
          servicePort: 80
      - path: /api
        backend:
          serviceName: backend
          servicePort: 80

我相信这是在做什么

  • 部署前端和后端应用 - 我将patientplatypus/frontend_examplepatientplatypus/backend_example部署到dockerhub,然后将图像拉下来。我有一个悬而未决的问题是,如果我不想从docker hub中提取图像而只是想从我的localhost加载,那该怎么可能呢?在这种情况下,我会将我的代码推送到生产服务器,在服务器上构建docker镜像,然后上传到kubernetes。如果我希望我的图像是私密的,我不必依赖dockerhub。

  • 它正在创建两个服务端点,用于将外部流量从Web浏览器路由到每个部署。这些服务属于loadBalancer类型,因为它们正在平衡我在部署中的(在这种情况下为3个)复制集之间的流量。

  • 最后,我有一个假设的入口控制器,允许我的服务通过www.kubeplaytime.examplewww.kubeplaytime.example/api相互路由。但是这不起作用。

运行时会发生什么?

patientplatypus:~/Documents/kubePlay:09:17:50$kubectl create -f kube-deploy.yaml
deployment.apps "frontend" created
service "frontend" created
deployment.apps "backend" created
service "backend" created
ingress.extensions "frontend" created
  • 首先,它似乎创建了我需要的所有部分,没有任何错误。

    patientplatypus:~/Documents/kubePlay:09:22:30$kubectl get --watch services

    NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE

    backend LoadBalancer 10.0.18.174 <pending> 80:31649/TCP 1m

    frontend LoadBalancer 10.0.100.65 <pending> 80:32635/TCP 1m

    kubernetes ClusterIP 10.0.0.1 <none> 443/TCP 10d

    frontend LoadBalancer 10.0.100.65 138.91.126.178 80:32635/TCP 2m

    backend LoadBalancer 10.0.18.174 138.91.121.182 80:31649/TCP 2m

  • 其次,如果我观看服务,我最终会获得可用于在浏览器中导航到这些网站的IP地址。上述每个IP地址都可以分别将我路由到前端和后端。

无论其

当我尝试使用入口控制器时,我遇到了一个问题 - 它看似已部署,但我不知道如何到达那里。

patientplatypus:~/Documents/kubePlay:09:24:44$kubectl get ingresses
NAME       HOSTS                      ADDRESS   PORTS     AGE
frontend   www.kubeplaytime.example             80        16m
  • 所以我没有可以使用的地址,www.kubeplaytime.example似乎无效。

我必须要做的就是路由到我刚刚创建的入口扩展,是为了获取IP地址,在 it 上使用服务和部署,但这开始看起来令人难以置信非常复杂。

例如,请看一下这篇中篇文章:https://medium.com/@cashisclay/kubernetes-ingress-82aa960f658e

似乎只为服务路由添加到Ingress的必要代码(即他称之为 Ingress Controller )似乎是这样的:

---
kind: Service
apiVersion: v1
metadata:
  name: ingress-nginx
spec:
  type: LoadBalancer
  selector:
    app: ingress-nginx
  ports:
  - name: http
    port: 80
    targetPort: http
  - name: https
    port: 443
    targetPort: https
---
kind: Deployment
apiVersion: extensions/v1beta1
metadata:
  name: ingress-nginx
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: ingress-nginx
    spec:
      terminationGracePeriodSeconds: 60
      containers:
      - image: gcr.io/google_containers/nginx-ingress-controller:0.8.3
        name: ingress-nginx
        imagePullPolicy: Always
        ports:
          - name: http
            containerPort: 80
            protocol: TCP
          - name: https
            containerPort: 443
            protocol: TCP
        livenessProbe:
          httpGet:
            path: /healthz
            port: 10254
            scheme: HTTP
          initialDelaySeconds: 30
          timeoutSeconds: 5
        env:
          - name: POD_NAME
            valueFrom:
              fieldRef:
                fieldPath: metadata.name
          - name: POD_NAMESPACE
            valueFrom:
              fieldRef:
                fieldPath: metadata.namespace
        args:
        - /nginx-ingress-controller
        - --default-backend-service=$(POD_NAMESPACE)/nginx-default-backend
---
kind: Service
apiVersion: v1
metadata:
  name: nginx-default-backend
spec:
  ports:
  - port: 80
    targetPort: http
  selector:
    app: nginx-default-backend
---
kind: Deployment
apiVersion: extensions/v1beta1
metadata:
  name: nginx-default-backend
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: nginx-default-backend
    spec:
      terminationGracePeriodSeconds: 60
      containers:
      - name: default-http-backend
        image: gcr.io/google_containers/defaultbackend:1.0
        livenessProbe:
          httpGet:
            path: /healthz
            port: 8080
            scheme: HTTP
          initialDelaySeconds: 30
          timeoutSeconds: 5
        resources:
          limits:
            cpu: 10m
            memory: 20Mi
          requests:
            cpu: 10m
            memory: 20Mi
        ports:
        - name: http
          containerPort: 8080
          protocol: TCP

这似乎需要附加到我上面的其他yaml代码中,以便为我的入口路由获取服务入口点,它似乎确实提供了一个ip:

patientplatypus:~/Documents/kubePlay:09:54:12$kubectl get --watch services
NAME                    TYPE           CLUSTER-IP    EXTERNAL-IP   PORT(S)                      AGE
backend                 LoadBalancer   10.0.31.209   <pending>     80:32428/TCP                 4m
frontend                LoadBalancer   10.0.222.47   <pending>     80:32482/TCP                 4m
ingress-nginx           LoadBalancer   10.0.28.157   <pending>     80:30573/TCP,443:30802/TCP   4m
kubernetes              ClusterIP      10.0.0.1      <none>        443/TCP                      10d
nginx-default-backend   ClusterIP      10.0.71.121   <none>        80/TCP                       4m
frontend   LoadBalancer   10.0.222.47   40.121.7.66   80:32482/TCP   5m
ingress-nginx   LoadBalancer   10.0.28.157   40.121.6.179   80:30573/TCP,443:30802/TCP   6m
backend   LoadBalancer   10.0.31.209   40.117.248.73   80:32428/TCP   7m

所以ingress-nginx似乎是我想去的网站。导航到40.121.6.179会返回默认的404消息(default backend - 404) - 它不会转到frontend,因为/要路由。 /api返回相同的内容。导航到我的主机名称空间www.kubeplaytime.example会从浏览器返回404 - 无错误处理。

问题

  • Ingress控制器是否严格必要,如果有,那么这个版本的复杂程度是否较低?

  • 我觉得我很亲密,我做错了什么?

完整的YAML

此处可用:https://gist.github.com/patientplatypus/fa07648339ee6538616cb69282a84938

感谢您的帮助!

编辑编辑

我试图使用 HELM 。从表面上看,它似乎是一个简单的界面,所以我尝试将它旋转起来:

patientplatypus:~/Documents/kubePlay:12:13:00$helm install stable/nginx-ingress
NAME:   erstwhile-beetle
LAST DEPLOYED: Sun May  6 12:13:30 2018
NAMESPACE: default
STATUS: DEPLOYED

RESOURCES:
==> v1/ConfigMap
NAME                                       DATA  AGE
erstwhile-beetle-nginx-ingress-controller  1     1s

==> v1/Service
NAME                                            TYPE          CLUSTER-IP   EXTERNAL-IP  PORT(S)                     AGE
erstwhile-beetle-nginx-ingress-controller       LoadBalancer  10.0.216.38  <pending>    80:31494/TCP,443:32118/TCP  1s
erstwhile-beetle-nginx-ingress-default-backend  ClusterIP     10.0.55.224  <none>       80/TCP                      1s

==> v1beta1/Deployment
NAME                                            DESIRED  CURRENT  UP-TO-DATE  AVAILABLE  AGE
erstwhile-beetle-nginx-ingress-controller       1        1        1           0          1s
erstwhile-beetle-nginx-ingress-default-backend  1        1        1           0          1s

==> v1beta1/PodDisruptionBudget
NAME                                            MIN AVAILABLE  MAX UNAVAILABLE  ALLOWED DISRUPTIONS  AGE
erstwhile-beetle-nginx-ingress-controller       1              N/A              0                    1s
erstwhile-beetle-nginx-ingress-default-backend  1              N/A              0                    1s

==> v1/Pod(related)
NAME                                                             READY  STATUS             RESTARTS  AGE
erstwhile-beetle-nginx-ingress-controller-7df9b78b64-24hwz       0/1    ContainerCreating  0         1s
erstwhile-beetle-nginx-ingress-default-backend-849b8df477-gzv8w  0/1    ContainerCreating  0         1s


NOTES:
The nginx-ingress controller has been installed.
It may take a few minutes for the LoadBalancer IP to be available.
You can watch the status by running 'kubectl --namespace default get services -o wide -w erstwhile-beetle-nginx-ingress-controller'

An example Ingress that makes use of the controller:

  apiVersion: extensions/v1beta1
  kind: Ingress
  metadata:
    annotations:
      kubernetes.io/ingress.class: nginx
    name: example
    namespace: foo
  spec:
    rules:
      - host: www.example.com
        http:
          paths:
            - backend:
                serviceName: exampleService
                servicePort: 80
              path: /
    # This section is only required if TLS is to be enabled for the Ingress
    tls:
        - hosts:
            - www.example.com
          secretName: example-tls

If TLS is enabled for the Ingress, a Secret containing the certificate and key must also be provided:

  apiVersion: v1
  kind: Secret
  metadata:
    name: example-tls
    namespace: foo
  data:
    tls.crt: <base64 encoded cert>
    tls.key: <base64 encoded key>
  type: kubernetes.io/tls

看起来这非常好 - 它可以解决所有问题并提供一个如何添加入口的示例。自从我在空白kubectl中旋转掌舵后,我使用了以下yaml文件来添加我认为需要的内容。

文件:

apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: frontend
  labels:
    app: frontend
spec:
  replicas: 3
  selector:
    matchLabels:
      app: frontend
  template:
    metadata:
      labels:
        app: frontend
    spec:
      containers:
      - name: nginx
        image: patientplatypus/frontend_example
        ports:
        - containerPort: 3000
---
apiVersion: v1
kind: Service
metadata:
  name: frontend
spec:
  type: LoadBalancer
  selector:
    app: frontend
  ports:
    - protocol: TCP
      port: 80
      targetPort: 3000
---
apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: backend
  labels:
    app: backend
spec:
  replicas: 3
  selector:
    matchLabels:
      app: backend
  template:
    metadata:
      labels:
        app: backend
    spec:
      containers:
      - name: nginx
        image: patientplatypus/backend_example
        ports:
        - containerPort: 5000
---
apiVersion: v1
kind: Service
metadata:
  name: backend
spec:
  type: LoadBalancer
  selector:
    app: backend
  ports:
    - protocol: TCP
      port: 80
      targetPort: 5000
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    kubernetes.io/ingress.class: nginx
spec:
  rules:
    - host: www.example.com
      http:
        paths:
          - path: /api
            backend:
              serviceName: backend
              servicePort: 80
          - path: /
            frontend:
              serviceName: frontend
              servicePort: 80

将此部署到群集会遇到此错误:

patientplatypus:~/Documents/kubePlay:11:44:20$kubectl create -f kube-deploy.yaml
deployment.apps "frontend" created
service "frontend" created
deployment.apps "backend" created
service "backend" created
error: error validating "kube-deploy.yaml": error validating data: [ValidationError(Ingress.spec.rules[0].http.paths[1]): unknown field "frontend" in io.k8s.api.extensions.v1beta1.HTTPIngressPath, ValidationError(Ingress.spec.rules[0].http.paths[1]): missing required field "backend" in io.k8s.api.extensions.v1beta1.HTTPIngressPath]; if you choose to ignore these errors, turn validation off with --validate=false

那么,问题就变成了,如何调试这个问题? 如果你吐出了舵所产生的代码,它基本上是不可读的 - 那里没有办法去找那些正在发生的事情。

检查出来:https://gist.github.com/patientplatypus/0e281bf61307f02e16e0091397a1d863 - 超过1000行!

如果有人有更好的方法来调试helm deploy,请将其添加到打开的问题列表中。

编辑编辑编辑

为了简化的极端,我尝试仅使用命名空间从一个pod调用另一个pod。

所以这是我的React代码,我在那里发出http请求:

axios.get('http://backend/test')
.then(response=>{
  console.log('return from backend and response: ', response);
})
.catch(error=>{
  console.log('return from backend and error: ', error);
})

我还试图在没有运气的情况下使用http://backend.exampledeploy.svc.cluster.local/test

这是处理get:

的节点代码
router.get('/test', function(req, res, next) {
  res.json({"test":"test"})
});

以下是我上传到yaml群集的kubectl文件:

apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: frontend
  namespace: exampledeploy
  labels:
    app: frontend
spec:
  replicas: 3
  selector:
    matchLabels:
      app: frontend
  template:
    metadata:
      labels:
        app: frontend
    spec:
      containers:
      - name: nginx
        image: patientplatypus/frontend_example
        ports:
        - containerPort: 3000
---
apiVersion: v1
kind: Service
metadata:
  name: frontend
  namespace: exampledeploy
spec:
  type: LoadBalancer
  selector:
    app: frontend
  ports:
    - protocol: TCP
      port: 80
      targetPort: 3000
---
apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: backend
  namespace: exampledeploy
  labels:
    app: backend
spec:
  replicas: 3
  selector:
    matchLabels:
      app: backend
  template:
    metadata:
      labels:
        app: backend
    spec:
      containers:
      - name: nginx
        image: patientplatypus/backend_example
        ports:
        - containerPort: 5000
---
apiVersion: v1
kind: Service
metadata:
  name: backend
  namespace: exampledeploy
spec:
  type: LoadBalancer
  selector:
    app: backend
  ports:
    - protocol: TCP
      port: 80
      targetPort: 5000

上传到群集似乎可以在我的终端中看到:

patientplatypus:~/Documents/kubePlay:14:33:20$kubectl get all --namespace=exampledeploy 
NAME                            READY     STATUS    RESTARTS   AGE
pod/backend-584c5c59bc-5wkb4    1/1       Running   0          15m
pod/backend-584c5c59bc-jsr4m    1/1       Running   0          15m
pod/backend-584c5c59bc-txgw5    1/1       Running   0          15m
pod/frontend-647c99cdcf-2mmvn   1/1       Running   0          15m
pod/frontend-647c99cdcf-79sq5   1/1       Running   0          15m
pod/frontend-647c99cdcf-r5bvg   1/1       Running   0          15m

NAME               TYPE           CLUSTER-IP     EXTERNAL-IP      PORT(S)        AGE
service/backend    LoadBalancer   10.0.112.160   168.62.175.155   80:31498/TCP   15m
service/frontend   LoadBalancer   10.0.246.212   168.62.37.100    80:31139/TCP   15m

NAME                             DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
deployment.extensions/backend    3         3         3            3           15m
deployment.extensions/frontend   3         3         3            3           15m

NAME                                        DESIRED   CURRENT   READY     AGE
replicaset.extensions/backend-584c5c59bc    3         3         3         15m
replicaset.extensions/frontend-647c99cdcf   3         3         3         15m

NAME                       DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/backend    3         3         3            3           15m
deployment.apps/frontend   3         3         3            3           15m

NAME                                  DESIRED   CURRENT   READY     AGE
replicaset.apps/backend-584c5c59bc    3         3         3         15m
replicaset.apps/frontend-647c99cdcf   3         3         3         15m

但是,当我尝试发出请求时,我收到以下错误:

return from backend and error:  
Error: Network Error
Stack trace:
createError@http://168.62.37.100/static/js/bundle.js:1555:15
handleError@http://168.62.37.100/static/js/bundle.js:1091:14
App.js:14

由于axios来自浏览器的调用,我想知道是否根本无法使用此方法来调用后端,即使后端和前端位于不同的pod中。我有点失落,因为我认为这是将pod连接在一起的最简单方法。

编辑X5

我已经确定可以通过exec进入pod这样从命令行卷曲后端:

patientplatypus:~/Documents/kubePlay:15:25:25$kubectl exec -ti frontend-647c99cdcf-5mfz4 --namespace=exampledeploy -- curl -v http://backend/test
* Hostname was NOT found in DNS cache
*   Trying 10.0.249.147...
* Connected to backend (10.0.249.147) port 80 (#0)
> GET /test HTTP/1.1
> User-Agent: curl/7.38.0
> Host: backend
> Accept: */*
> 
< HTTP/1.1 200 OK
< X-Powered-By: Express
< Content-Type: application/json; charset=utf-8
< Content-Length: 15
< ETag: W/"f-SzkCEKs7NV6rxiz4/VbpzPnLKEM"
< Date: Sun, 06 May 2018 20:25:49 GMT
< Connection: keep-alive
< 
* Connection #0 to host backend left intact
{"test":"test"}

这意味着,毫无疑问,因为前端代码正在浏览器中执行,它需要Ingress才能进入pod,因为来自前端的http请求正在打破简单的pod联网。我不确定这一点,但这意味着Ingress是必要的。

3 个答案:

答案 0 :(得分:4)

首先,让我们澄清一些明显的误解。您提到您的前端是React应用程序,可能会在用户浏览器中运行。为此,您的实际问题不是您的后端和前端广告相互沟通,但浏览器需要能够连接到这两个广告连播(到前端pod以加载React应用程序,以及到React应用程序的后端pod以进行API调用)。

要想象:

                                                 +---------+
                                             +---| Browser |---+                                                 
                                             |   +---------+   |
                                             V                 V
+-----------+     +----------+         +-----------+     +----------+
| Front-end |---->| Back-end |         | Front-end |     | Back-end |
+-----------+     +----------+         +-----------+     +----------+
      (what you asked for)                     (what you need)

如前所述,最简单的解决方案是使用Ingress controller。我不会详细介绍如何在这里设置Ingress控制器;在某些云环境(如GKE)中,您将能够使用云提供商为您提供的Ingress控制器。否则,您可以设置NGINX Ingress controller。有关更多信息,请查看NGINX Ingress控制器deployment guide

定义服务

首先为前端和后端应用程序定义Service resources(这些也允许您的Pod相互通信)。服务定义可能如下所示:

apiVersion: v1
kind: Service
metadata:
  name: backend
spec:
  selector:
    app: backend
  ports:
    - protocol: TCP
      port: 80
      targetPort: 8080

确保您的Pod具有可由服务资源选择的labels(在此示例中,我使用app=backendapp=frontend作为标签)。

如果你想建立Pod-to-Pod通信,你现在就完成了。在每个Pod中,您现在可以使用backend.<namespace>.svc.cluster.local(或backend作为速记)和frontend作为主机名来连接到该Pod。

定义入口

接下来,您可以定义Ingress资源;由于两个服务都需要从集群外部(用户浏览器)进行连接,因此您需要两种服务的Ingress定义。

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: frontend
spec:      
  rules:
  - host: www.your-application.example
    http:
      paths:
      - path: /
        backend:
          serviceName: frontend
          servicePort: 80
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: backend
spec:      
  rules:
  - host: api.your-application.example
    http:
      paths:
      - path: /
        backend:
          serviceName: backend
          servicePort: 80

或者,您也可以使用单个Ingress资源聚合前端和后端(此处没有“正确”答案,只是偏好):

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: frontend
spec:      
  rules:
  - host: www.your-application.example
    http:
      paths:
      - path: /
        backend:
          serviceName: frontend
          servicePort: 80
      - path: /api
        backend:
          serviceName: backend
          servicePort: 80

之后,请确保www.your-application.exampleapi.your-application.example都指向您的Ingress控制器的外部IP地址,您应该完成。

答案 1 :(得分:3)

事实证明我过于复杂。这是Kubernetes文件,可以满足我的需求。您可以使用两个部署(前端和后端)和一个服务入口点来完成此操作。据我所知,服务可以对许多(不仅仅是2个)不同的部署进行负载平衡,这意味着对于实际开发而言,这应该是微服务开发的良好开端。入口方法的一个好处是允许使用路径名而不是端口号,但考虑到难度,它在开发中似乎不实用。

以下是yaml文件:

apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: frontend
  labels:
    app: exampleapp
spec:
  replicas: 3
  selector:
    matchLabels:
      app: exampleapp
  template:
    metadata:
      labels:
        app: exampleapp
    spec:
      containers:
      - name: nginx
        image: patientplatypus/kubeplayfrontend
        ports:
        - containerPort: 3000
---
apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: backend
  labels:
    app: exampleapp
spec:
  replicas: 3
  selector:
    matchLabels:
      app: exampleapp
  template:
    metadata:
      labels:
        app: exampleapp
    spec:
      containers:
      - name: nginx
        image: patientplatypus/kubeplaybackend
        ports:
        - containerPort: 5000
---
apiVersion: v1
kind: Service
metadata:
  name: entrypt
spec:
  type: LoadBalancer
  ports:
  - name: backend
    port: 8080
    targetPort: 5000
  - name: frontend
    port: 81
    targetPort: 3000
  selector:
    app: exampleapp

以下是我用来启动它的bash命令(你可能需要添加一个登录命令 - docker login - 来推送到dockerhub):

#!/bin/bash

# stop all containers
echo stopping all containers
docker stop $(docker ps -aq)
# remove all containers
echo removing all containers
docker rm $(docker ps -aq)
# remove all images
echo removing all images
docker rmi $(docker images -q)

echo building backend
cd ./backend
docker build -t patientplatypus/kubeplaybackend .
echo push backend to dockerhub
docker push patientplatypus/kubeplaybackend:latest

echo building frontend
cd ../frontend
docker build -t patientplatypus/kubeplayfrontend .
echo push backend to dockerhub
docker push patientplatypus/kubeplayfrontend:latest

echo now working on kubectl
cd ..
echo deleting previous variables
kubectl delete pods,deployments,services entrypt backend frontend
echo creating deployment
kubectl create -f kube-deploy.yaml
echo watching services spin up
kubectl get services --watch

实际代码只是一个前端反应应用程序,在启动应用程序页面的componentDidMount上对后端节点路由进行axios http调用。

您还可以在此处查看一个有效的示例:https://github.com/patientplatypus/KubernetesMultiPodCommunication

再次感谢大家的帮助。

答案 2 :(得分:0)

要使用入口控制器,您需要拥有有效的域(配置DNS服务器以指向您的入口控制器ip)。这不是由于任何kubernetes“魔术”,而是由于vhosts的工作方式(here是nginx的一个例子 - 经常被用作入口服务器,但任何其他入口实现将在引擎盖下以相同的方式工作)。

如果您无法配置域,则最简单的开发方式是创建kubernetes服务。使用kubectl expose

进行此操作有一个很好的捷径
kubectl expose pod frontend-pod --port=444 --name=frontend
kubectl expose pod backend-pod --port=888 --name=backend