在拒绝连接的情况下，继续在 Kubernetes Cron Job 上获取错误状态？

Question

我正在尝试编写一个 cron 作业，该作业命中它正在拉取其映像的应用程序的其余端点。下面是示例代码：

---
apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: {{ .Chart.Name }}-cronjob
  labels:
    app: {{ .Release.Name }}
    chart: {{ .Chart.Name }}-{{ .Chart.Version }}
    release: {{ .Release.Name }}
spec:
  concurrencyPolicy: Forbid
  successfulJobsHistoryLimit: 2
  failedJobsHistoryLimit: 2
  startingDeadlineSeconds: 1800
  jobTemplate:
    spec:
      template:
        metadata:
          name: {{ .Chart.Name }}-cronjob
          labels:
            app: {{ .Chart.Name }}
        spec:
          restartPolicy: OnFailure
          containers:
            - name: demo
              image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
              command: ["/bin/sh", "-c", "curl http://localhost:8080/hello"]
              readinessProbe:
                httpGet:
                  path: "/healthcheck"
                  port: 8081
                initialDelaySeconds: 300
                periodSeconds: 60
                timeoutSeconds: 30
                failureThreshold: 3
              livenessProbe:
                httpGet:
                  path: "/healthcheck"
                  port: 8081
                initialDelaySeconds: 300
                periodSeconds: 60
                timeoutSeconds: 30
                failureThreshold: 3
              resources:
                requests:
                  cpu: 200m
                  memory: 2Gi
                limits:
                  cpu: 1
                  memory: 6Gi
  schedule: "*/5 * * * *"

但我将运行保留为 *curl: (7) Failed to connect to localhost port 8080: Connection refused*。我可以从它创建容器并立即抛出的事件中看到：后退重新启动失败的容器。我已经有 pods 运行的演示应用程序，它工作正常，就在我试图指向这个现有应用程序并点击休息端点时，我开始运行进入连接拒绝错误.

查看日志时的准确输出：

 % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0curl: (7) Failed to connect to localhost port 8080: Connection refused

事件日志：

Container image "wayfair/demo:728ac13-as_test_cron_job" already present on machine
9m49s       Normal    Created                pod/demo-cronjob-1619108100-ndrnx   Created container demo
6m17s       Warning   BackOff                pod/demo-cronjob-1619108100-ndrnx   Back-off restarting failed container
5m38s       Normal    SuccessfulDelete       job/demo-cronjob-1619108100         Deleted pod: demo-cronjob-1619108100-ndrnx
5m38s       Warning   BackoffLimitExceeded   job/demo-cronjob-1619108100         Job has reached the specified backoff limit

刚接触K8，大家多多指教！

Answer 1

您正在尝试使用您的 curl 连接到 localhost:8080，根据我对您的 CronJob 定义的理解，这没有任何意义。

来自文档（位于 https://kubernetes.io/docs/tasks/inject-data-application/define-command-argument-container/#define-a-command-and-arguments-when-you-create-a-pod ）

The command and arguments that you define in the configuration file override the default command and arguments provided by the container image. If you define args, but do not define a command, the default command is used with your new arguments.

Note: The command field corresponds to entrypoint in some container runtimes. Refer to the Notes below.

如果您为映像定义命令，即使映像会使用其默认入口点（或命令，取决于您使用的容器类型）在本地主机上的端口 8080 上启动休息应用程序，该命令也会覆盖入口点并且没有应用程序启动。

如果您需要启动应用程序然后执行其他操作，如 curls 等，我建议使用 .sh 脚本或类似的东西，具体取决于作业是什么 objective.

在拒绝连接的情况下，继续在 Kubernetes Cron Job 上获取错误状态？

Keep getting error status on Kubernetes Cron Job with connection refused?

kubernetes

kubernetes-cronjob