Cronjob for service

Question

我需要你的帮助来理解如何创建一个Kubernetes cronjob，它将使用curl使用服务nginx-server-service来获取/customdir/index.html有什么办法吗?

apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-server
labels:
tier: application
spec:
replicas: 1
selector:
matchLabels:
app: nginx-server
template:
metadata:
labels:
app: nginx-server
spec:
volumes:
- name: index-html
emptyDir: {}
initContainers:
- name: setup
image: alpine:3.8
command:
- /bin/sh
- -c
- echo kubernetes works > /task-dir/index.html
volumeMounts:
- name: index-html
mountPath: "/task-dir"
containers:
- name: nginx
image: nginx:mainline
ports:
- containerPort: 80
volumeMounts:
- name: index-html
mountPath: /usr/share/nginx/html/customdir
---
# next, a service is required to handle traffic to the pods created by the deployment
apiVersion: v1
kind: Service
metadata:
name: nginx-server-service
labels:
tier: networking
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
nodePort: 30001
selector:
app: nginx-server
type: ClusterIP

我将非常感谢任何帮助，深入研究

我正在研究解决方案，所以我可以问你它是否有效:

apiVersion: batch/v1beta1
kind: CronJob
metadata:
name: curljob
spec:
jobTemplate:
metadata:
name: curljob
spec:
template:
metadata:
spec:
containers:
- command:
- curl
- http://myapp-service:30001/customdir
image: curlimages/curl
imagePullPolicy: Always
name: curljobt
restartPolicy: OnFailure
schedule: '*/1 * * * *'

我编辑了一点，但不确定为什么不工作:(乞求帮助

Answer 1

首先，您使用ClusterIP服务类型作为服务。所以你不能在这里提供NodePort

那么当你试图访问一个有服务的pod时，你需要调用一个维护模板的DNS名称。

模板与my_Service_Name.my_Namespace.svc.cluster-domain.example类似，但可以跳过cluster-domain.example部分。只有Service_Name.Namespace.svc可以正常工作。

所以这里你需要curlhttp://nginx-server-service.default.svc/customdir/index.html这个地址。

在这里，我给出了为我工作的整个yaml;

apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-server
labels:
tier: application
spec:
replicas: 1
selector:
matchLabels:
app: nginx-server
template:
metadata:
labels:
app: nginx-server
spec:
volumes:
- name: index-html
emptyDir: {}
initContainers:
- name: setup
image: alpine:3.8
command:
- /bin/sh
- -c
- echo kubernetes works > /task-dir/index.html
volumeMounts:
- name: index-html
mountPath: "/task-dir"
containers:
- name: nginx
image: nginx:mainline
ports:
- containerPort: 80
volumeMounts:
- name: index-html
mountPath: /usr/share/nginx/html/customdir
---
# next, a service is required to handle traffic to the pods created by the deployment
apiVersion: v1
kind: Service
metadata:
name: nginx-server-service
labels:
tier: networking
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
app: nginx-server
type: ClusterIP
---

下面是更新后的cronjob

apiVersion: batch/v1beta1
kind: CronJob
metadata:
name: curljob
spec:
jobTemplate:
metadata:
name: curljob
spec:
template:
metadata:
spec:
containers:
- command:
- curl
- http://nginx-server-service.default.svc/customdir/index.html
image: curlimages/curl
imagePullPolicy: Always
name: curljobt
restartPolicy: OnFailure
schedule: '*/1 * * * *'