Running a bash script using a Kubenetes Service - bash

Question

I am not sure how dumb or un-reasonable this question is, but we are trying to see if we can do this in any way.
I have a .bash file. And I want to run this when I invoke a url.
Let's take the url is https://domainname.com/jobapi
When I invoke this on the browser, this should invoke a .bash script on the container.
Is this really possible?
If it is possible, want to know if I need to add this script as a deployment or a job?

Answer 1

The first step, before looking at Kubernetes, is to configure a web server to run your script. This could be a generic web server like nginx or Apache, and you could add your script as a CGI script. There's plenty of tutorials out there that explain how to write CGI scripts.
Depending on the requirements of your application, a simple HTTP hook server might be a better match. Have a look at, for example, https://github.com/adnanh/webhook.
Either way, try this out with just Docker first, before trying to create a pod and potentially a service and an ingress in Kubernetes.
In a second step, to be able to access your service (the server invoking your script), you need to create a pod, probably through a deployment, and potentially a service and an ingress for it.
Kubernetes jobs are for running a script (or other program) once. They're most useful to automate maintaince tasks for your application.

Answer 2

What I would try to do is to run the shell script from a php file. Otherwise you are going to need some sort of driver to trigger the script.
So you would have the script as a regular executable, and upon the request php will execute it via shell.
Actually you can make it like an API; domain.com/job1 could execute job1, domain.com/jobn could execute jobn and so on.
Now, the way I'm describing would work only as a Deployment, as you want the server to be always up and ready to get requests.

Answer 3

Create a ingress service (NodePort if external facing) which will call a service
Call a service which maps the labels defined on the pod(runs script).This pod can be from a deployment or a simple pod
Make this service expose a pod/deployment
deployment can trigger the pods with shell script or a pod can trigger a shell script as well.
Ingress service:
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: test-ingress
annotations:
nginx.ingress.kubernetes.io/rewrite-target: /
spec:
rules:
- host: "domainame.com"
http:
paths:
- path: /jobapi
pathType: Prefix
backend:
serviceName: my-service
servicePort: 8080
my-service.yaml
apiVersion: v1
kind: Service
metadata:
name: my-service
spec:
type: NodePort
selector:
app: MyApp
ports:
nodePort: 30007
port: 8080
targetPort: 8080
run your bash script, this can be done by defining a deployment or a pod
Pod:
k run MyApp --image=nginx --labels=app=MyApp --port=8080 -- /bin/sh -c echo 'Im up'
or
Deployment.yaml
controllers/nginx-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
labels:
app: MyAppdep
spec:
replicas: 2
selector:
matchLabels:
app: MyApp
template:
metadata:
labels:
app: MyApp
spec:
containers:
- name: nginx
image: nginx:1.14.2
commands: ["/bin/sh","-c","echo 'test'"]
ports:
- containerPort: 8080