How to deploy MariaDB on kubernetes with some default schema and data? - kubernetes

Question

For some context, I'm trying to build a staging / testing system on kubernetes which starts with deploying a mariadb on the cluster with some schema and data. I have a trunkated / clensed db dump from prod to help me with that. Let's call that file : dbdump.sql which is present in my local box in the path /home/rjosh/database/script/ . After much reasearch here is what my yaml file looks like:
apiVersion: v1
kind: PersistentVolume
metadata:
name: m3ma-pv-volume
labels:
type: local
spec:
storageClassName: manual
capacity:
storage: 30Gi
accessModes:
- ReadWriteOnce
hostPath:
path: "/mnt/data"
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: m3ma-pv-claim
spec:
storageClassName: manual
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 30Gi
---
apiVersion: v1
kind: Service
metadata:
name: m3ma
spec:
ports:
- port: 3306
selector:
app: m3ma
clusterIP: None
---
apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
kind: Deployment
metadata:
name: m3ma
spec:
selector:
matchLabels:
app: m3ma
strategy:
type: Recreate
template:
metadata:
labels:
app: m3ma
spec:
containers:
- image: mariadb:10.2
name: m3ma
env:
# Use secret in real usage
- name: MYSQL_ROOT_PASSWORD
value: password
ports:
- containerPort: 3306
name: m3ma
volumeMounts:
- name: m3ma-persistent-storage
mountPath: /var/lib/mysql/
- name: m3ma-host-path
mountPath: /docker-entrypoint-initdb.d/
volumes:
- name: m3ma-persistent-storage
persistentVolumeClaim:
claimName: m3ma-pv-claim
- name: m3ma-host-path
hostPath:
path: /home/smaikap/database/script/
type: Directory
The MariaDB instance is coming up but not with the schema and data that is present in /home/rjosh/database/script/dbdump.sql.
Basically, the mount is not working. If I connect to the pod and check /docker-entrypoint-initdb.d/ there is nothing. How do I go about this?
A bit more details. Currently, I'm testing it on minikube. But, soon it will have to work on GKE cluster. Looking at the documentation, hostPath is not the choice for GKE. So, what the correct way of doing this?

Answer 1

Are you sure your home directory is visible to Kubernetes? Minikube generally creates a little VM to run things in, which wouldn't have your home dir in it. The more usual way to handle this would be to make a very small new Docker image yourself like:
FROM mariadb:10.2
COPY dbdump.sql /docker-entrypoint-initdb.d/
And then push it to a registry somewhere, and then use that image instead.