Mount host dir for Postgres on Minikube - permissions issue - postgresql

Question

I'm trying to setup PostgreSQL on Minikube with data path being my host folder mounted on Minikube (I'd like to keep my data on host).
With the kubernetes object created (below) I get permission error, the same one as here How to solve permission trouble when running Postgresql from minikube? although the question mentioned doesn't answer the issue. It advises to mount minikube's VM dir instead.
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: postgres
labels:
app: postgres
spec:
replicas: 1
selector:
matchLabels:
app: postgres
template:
metadata:
labels:
app: postgres
spec:
containers:
- name: postgres
image: postgres
volumeMounts:
- mountPath: /var/lib/postgresql/data
name: storage
env:
- name: POSTGRES_PASSWORD
value: user
- name: POSTGRES_USER
value: pass
- name: POSTGRES_DB
value: k8s
volumes:
- name: storage
hostPath:
path: /data/postgres
Is there any other way to do that other than building own image on top of Postgres and playing with the permissions somehow? I'm on macOS with Minikube 0.30.0 and I'm experiencing that with both Virtualbox and hyperkit drivers for Minikube.

Answer 1

Look at these lines from here : hostPath
the files or directories created on the underlying hosts are only writable by root. You either need to run your process as root in a privileged Container or modify the file permissions on the host to be able to write to a hostPath volume
So, either you have to run as root or you have to change the file permission of /data/postgres directory.
However, you can run your Postgres container as root without rebuilding docker image.
You have to add following to your container:
securityContext:
runAsUser: 0
Your yaml should look like this:
apiVersion: apps/v1
kind: Deployment
metadata:
name: postgres
labels:
app: postgres
spec:
replicas: 1
selector:
matchLabels:
app: postgres
template:
metadata:
labels:
app: postgres
spec:
containers:
- name: postgres
image: postgres
volumeMounts:
- mountPath: /var/lib/postgresql/data
name: storage
env:
- name: POSTGRES_PASSWORD
value: user
- name: POSTGRES_USER
value: pass
- name: POSTGRES_DB
value: k8s
securityContext:
runAsUser: 0
volumes:
- name: storage
hostPath:
path: /data/postgres