ceph-csi/examples/rbd/pod-clone.yaml

---
apiVersion: v1
kind: Pod
metadata:
  name: csi-rbd-clone-demo-app
spec:
  containers:
    - name: web-server
      image: nginx
      volumeMounts:
        - name: mypvc
          mountPath: /var/lib/www/html
  volumes:
    - name: mypvc
      persistentVolumeClaim:
        claimName: rbd-pvc-clone
        readOnly: false
rbd: Add support for smart cloning Added support for RBD PVC to PVC cloning, below commands are executed to create a PVC-PVC clone from RBD side. * Check the depth(n) of the cloned image if n>=(hard limit -2) or ((soft limit-2) Add a task to flatten the image and return about (to avoid image leak) Note will try to flatten the temp clone image in the chain if available * Reserve the key and values in omap (this will help us to avoid the leak as it's not reserved earlier as we have returned ABORT (the request may not come back)) * Create a snapshot of rbd image * Clone the snapshot (temp clone) * Delete the snapshot * Snapshot the temp clone * Clone the snapshot (final clone) * Delete the snapshot ```bash 1) check the image depth of the parent image if flatten required add a task to flatten image and return ABORT to avoid leak (hardlimit-2 and softlimit-2 check will be done) 2) Reserve omap keys 2) rbd snap create <RBD image for src k8s volume>@<random snap name> 3) rbd clone --rbd-default-clone-format 2 --image-feature layering,deep-flatten <RBD image for src k8s volume>@<random snap> <RBD image for temporary snap image> 4) rbd snap rm <RBD image for src k8s volume>@<random snap name> 5) rbd snap create <cloned RBD image created in snapshot process>@<random snap name> 6) rbd clone --rbd-default-clone-format 2 --image-feature <k8s dst vol config> <RBD image for temporary snap image>@<random snap name> <RBD image for k8s dst vol> 7)rbd snap rm <RBD image for src k8s volume>@<random snap name> ``` * Delete temporary clone image created as part of clone(delete if present) * Delete rbd image Signed-off-by: Madhu Rajanna <madhupr007@gmail.com> 2020-07-07 12:14:19 +00:00			`---`
			`apiVersion: v1`
			`kind: Pod`
			`metadata:`
			`name: csi-rbd-clone-demo-app`
			`spec:`
			`containers:`
			`- name: web-server`
			`image: nginx`
			`volumeMounts:`
			`- name: mypvc`
			`mountPath: /var/lib/www/html`
			`volumes:`
			`- name: mypvc`
			`persistentVolumeClaim:`
			`claimName: rbd-pvc-clone`
			`readOnly: false`