minikube - Create a file from Job on local machine - kubernetes

Question

I want to create a file from a job on my local machine, where I use minikube. I want to do that in /tmp directory.
Here's my CronJob definition
apiVersion: batch/v1beta1
kind: CronJob
metadata:
generateName: test-
spec:
schedule: 1 2 * * *
jobTemplate:
spec:
template:
spec:
volumes:
- name: test-volume
hostPath:
path: /tmp
containers:
- name: test-job
image: busybox
args:
- /bin/sh
- '-c'
- touch /data/ok.txt
volumeMounts:
- mountPath: /data
name: test-volume
restartPolicy: OnFailure
I mounted /tmp from my machine to /data on minikube. I did that using minikube mount "/tmp:data", and then I checked via minikube ssh if it works fine.
The problem is that with this configuration I cannot see the file ok.txt being created in /tmp, I can't even see it in /data on my minikube. I added a sleep command before to check if it works and get into the container to check if the file has been created. I listed all files from /data from the Pod, and the file was there.
How can I create this ok.txt file on my machine, in the /tmp?
Thanks in advance for help!!

Answer 1

Root cause
Root cause of this issue is related to paths in YAML.
In Minikube documentation regarding mount command, you can find information:
minikube mount [flags] <source directory>:<target directory>
where:
source directory is directory path on your machine
target directory is directory path mounted in minikube
To achieve what you want, you can to use `minikube mount "/tmp:/data" .
Side Note
Minikube driver was set to Docker.
Please keep in mind that mount must be stay alive for whole time.
📁 Mounting host path /tmp into VM as /data ...
...
🚀 Userspace file server: ufs starting
✅ Successfully mounted /tmp to /data
📌 NOTE: This process must stay alive for the mount to be accessible ...
Solution
Minikube Mount:
$ minikube mount "/tmp:/data"
CronJob YAML:
apiVersion: batch/v1beta1
kind: CronJob
metadata:
name: test
spec:
schedule: "*/1 * * * *" # I have changed schedule time for testing
jobTemplate:
spec:
template:
spec:
containers:
- name: test-job
image: busybox
args:
- /bin/sh
- '-c'
- touch /data/ok.txt
volumeMounts:
- mountPath: /data
name: test-volume
volumes:
- name: test-volume
hostPath:
path: /data
restartPolicy: OnFailure
Output
On Host:
$ pwd
/home/user
user#minikube:~$ cd /tmp
user#minikube:/tmp$ ls | grep ok.txt
ok.txt
On Minikube
user#minikube:~$ minikube ssh
docker#minikube:~$ pwd
/home/docker
docker#minikube:~$ ls
docker#minikube:~$ cd /data
docker#minikube:/data$ ls | grep ok
ok.txt
Please let me know if it worked for you.