How to create a file while creating(claiming) persistent volume? - docker

Question

I want to create a file at a certain path. The docker image that is being used is from the file:
singleuser:
image:
# Get the latest image tag at:
# https://hub.docker.com/r/jupyter/datascience-notebook/tags/
# Inspect the Dockerfile at:
# https://github.com/jupyter/docker-stacks/tree/master/datascience-notebook/Dockerfile
name: jupyter/datascience-notebook
tag: 177037d09156
The above yaml is taken from here: https://zero-to-jupyterhub.readthedocs.io/en/latest/user-environment.html
JuPyterHub creates a new pod for each user in the scheme singleUser. I want to create a file as soon as there is a creation of the new volume.
I tried reading docs and other relevant questions but none of them addressed this issue.
Below is the snippet where the storage logic is defined. Each user gets a new pvc and I want to create a new file in this pvc whenever it is created. I already have the homeMountPath and the username in the below code snippet, I don't know how to write a file - something on the similar lines as: echo "run_id = 'sample' " > /home/jovyan/username/.ipython/profile_default/startup/aviral.py
storage:
type: dynamic
extraLabels: {}
extraVolumes: []
extraVolumeMounts: []
static:
pvcName:
subPath: '{username}'
capacity: 10Gi
homeMountPath: /home/jovyan
dynamic:
storageClass:
pvcNameTemplate: claim-{username}{servername}
volumeNameTemplate: volume-{username}{servername}
storageAccessModes: [ReadWriteOnce]
The full helm chart is available here, the official one: https://jupyterhub.github.io/helm-chart/jupyterhub-0.8.2.tgz
I expect the pods when created in the namespace jhub have a file already created.

Answer 1

you can look at configmap object. files from configmap can be mounted as volume inside container.