volumizr
This is a simple (simplistic or poor but not necessarily bad) solution for solving storage in a Kubernetes cluster. The solution uses emptyDir volumes in StatefulSet and init-containers for setting up volumes before start by mirroring from a Minio server, and after start continuously mirrors changes back.
Usage
Mirror in
Docker:
$ docker run --rm -it -v $PWD/config.json:/app/config/config.json -v $PWD/mydata:/app/target thenatureofsoftware/volumizr in minio/bucket1 /app/target
Init container in Kubernetes:
annotations:
pod.beta.kubernetes.io/init-containers:
'[{
"name": "volumizr-in",
"image": "thenatureofsoftware/volumizr:latest",
"args": ["in", "minio/mysql", "/var/lib/mysql"],
"volumeMounts": [{
"mountPath": "/var/lib/mysql",
"name": "persistentdata"
}]
}]
Mirror out
For continuously mirror changes back to minio server.
Docker:
$ docker run --rm -it -v $PWD/config.json:/app/config/config.json -v $PWD/mydata:/app/source thenatureofsoftware/volumizr out /app/source minio/bucket1
As a sidecar container in Kubernetes:
...
- image: thenatureofsoftware/volumizr:latest
imagePullPolicy: Always
name: volumizr-out
args:
- out
- /var/lib/mysql
- minio/mysql
volumeMounts:
- mountPath: "/var/lib/mysql"
name: persistentdata
...