RabbitMQ configuration files is not coping in the Kubernetes deployment - kubernetes

Question

I'm trying to deploy RabbitMQ on the Kubernetes cluster and using the initcontainer to copy a file from ConfigMap. However, the file is not copying after POD is in a running state.
Initially, I have tried without using an initcontainer, but I was getting an error like "touch: cannot touch '/etc/rabbitmq/rabbitmq.conf': Read-only file system."
kind: Deployment
metadata:
name: broker01
namespace: s2sdocker
labels:
app: broker01
spec:
replicas: 1
selector:
matchLabels:
app: broker01
template:
metadata:
name: broker01
labels:
app: broker01
spec:
initContainers:
- name: configmap-copy
image: busybox
command: ['/bin/sh', '-c', 'cp /etc/rabbitmq/files/definitions.json /etc/rabbitmq/']
volumeMounts:
- name: broker01-definitions
mountPath: /etc/rabbitmq/files
- name: pre-install
mountPath: /etc/rabbitmq
containers:
- name: broker01
image: rabbitmq:3.7.17-management
envFrom:
- configMapRef:
name: broker01-rabbitmqenv-cm
ports:
volumeMounts:
- name: broker01-data
mountPath: /var/lib/rabbitmq
- name: broker01-log
mountPath: /var/log/rabbitmq/log
- name: broker01-definitions
mountPath: /etc/rabbitmq/files
volumes:
- name: pre-install
emptyDir: {}
- name: broker01-data
persistentVolumeClaim:
claimName: broker01-data-pvc
- name: broker01-log
persistentVolumeClaim:
claimName: broker01-log-pvc
- name: broker01-definitions
configMap:
name: broker01-definitions-cm
The file "definitions.json" should be copied to /etc/reabbitmq folder. I have followed "Kubernetes deployment read-only filesystem error". But issue did not fix.

Answer 1

After making changes in the "containers volumeMount section," I was able to copy the file on to /etc/rabbitmq folder.
Please find a modified code here.
- name: broker01
image: rabbitmq:3.7.17-management
envFrom:
- configMapRef:
name: broker01-rabbitmqenv-cm
ports:
volumeMounts:
- name: broker01-data
mountPath: /var/lib/rabbitmq
- name: broker01-log
mountPath: /var/log/rabbitmq/log
- name: pre-install
mountPath: /etc/rabbitmq

Answer 2

can you check permissions on /etc/rabbitmq/.
does the user has permission to copy the file to above location?
- name: pre-install
mountPath: /etc/rabbitmq
I see that /etc/rabbitmq is a mount point. it is a ready only file system and hence the file copy is failed.
can you update the permissions on 'pre-install' mount point