您如何通过使用端口8080的服务在OpenShift中部署一个应用程序？

Question

我很难理解Kubernetes网络，希望有人比文档更简单。

我的测试服务如下，包含我到目前为止有关端口和网络的所有信息。

它正在返回503。

# A Service can map any incoming port to a targetPort. 
# By default and for convenience, the `targetPort` 
# is set to the same value as the port field
apiVersion: v1
kind: Service
metadata:
  name: my-app
spec:
  ports:
    - name: HTTP
      # port is the stable port the Service exposes inside 
      # the cluster — other Pods in the cluster send traffic
      # to this port
      port: 5000 
      protocol: TCP
      
      # if you don’t specify a targetPort value, 
      # it defaults to the value specified in port

      # targetPort is the port that the container, 
      # within the Pod, listens on for incoming traffic.
      targetPort: 80 
      selector:
        app: my-app

route.yml - targetPort: 80
deployment.yml - containerPort: 80

Answer 1

您可以在我的github帐户下读取微小的代码段，以熟悉Nutshell中的K8S网络： https://github.com/nirgeier/kuberneteslabs/tree/master/master/labs/05-services

实验室将详细描述您要问的内容。

• 您还可以打印出信息（我已经知道我已经知道）

kubectl explain pod.spec.containers.ports

---

来回答您的问题：

• “查找”正在发生的事情的最简单方法是使用CLI创建资源并检查输出

# Create ns
kubectl create ns codewizard

# Create the deployment
kubectl create deployment \
        nginx             \
        -n codewizard     \
        --image=nginx

# Create the service
kubectl expose deployment \
        nginx             \
        -n codewizard     \
        --port 5000       \
        --target-port 80  \
        --type ClusterIP  # default

# Check the service
kubectl get svc -n codewizard -o wide

# check to verify that the pod is connected
kubectl get      endpoints -n codewizard
kubectl describe endpoints -n codewizard

---

让

我们

# Get the service yaml 
kubectl get svc nginx -n codewizard -o yaml

### Partial...
apiVersion: v1
kind: Service
...
spec:
  ports:
  - port: 5000
    protocol: TCP
    targetPort: 80

尝试测试我们的网络

# Create the 2nd deployment for our test
kubectl create deployment \
        multitool         \
        -n codewizard     \
        --image=praqma/network-multitool

# Lets get the pod name so we can test the connection to nginx
POD_NAME=$(kubectl get pods          \
                 --no-headers      \
                 -n codewizard     \
                 -o custom-columns=":metadata.name" \
                 | grep multitool)

# Test the connection 
kubectl exec -n codewizard $POD_NAME -- curl -svL nginx:5000