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Korb

Move Data from PVCs between StorageClasses, or rename them.

Installation

Using Homebrew

brew tap beryju/tap
brew install korb

Manually

Download the binary of the latest release from https://github.com/BeryJu/korb/releases

Usage

Move data between Kubernetes PVCs on different Storage Classes.

Usage:
  korb [pvc [pvc]] [flags]

Flags:
      --container-image string         Image to use for moving jobs (default "ghcr.io/beryju/korb-mover:v2")
      --force                          Ignore warning which would normally halt the tool during validation.
  -h, --help                           help for korb
      --kube-config string             (optional) absolute path to the kubeconfig file (default "/Users/jens/.kube/config")
      --new-pvc-access-mode strings    Access mode(s) for the new PVC. If empty, the access mode of the source will be used. Accepts formats like used in Kubernetes Manifests (ReadWriteOnce, ReadWriteMany, ...)
      --new-pvc-name string            Name for the new PVC. If empty, same name will be reused.
      --new-pvc-namespace string       Namespace for the new PVCs to be created in. If empty, the namespace from your kubeconfig file will be used.
      --new-pvc-size string            Size for the new PVC. If empty, the size of the source will be used. Accepts formats like used in Kubernetes Manifests (Gi, Ti, ...)
      --new-pvc-storage-class string   Storage class to use for the new PVC. If empty, the storage class of the source will be used.
      --skip-pvc-bind-wait             Skip waiting for PVC to be bound.
      --source-namespace string        Namespace where the old PVCs reside. If empty, the namespace from your kubeconfig file will be used.
      --strategy string                Strategy to use, by default will try to auto-select
      --timeout string                 Overwrite auto-generated timeout (by default 60s for Pod to start, copy timeout is based on PVC size)
      --tolerate-any-node              Allow job to tolerating any node node taints.

Strategies

To see existing strategies and what they do, please check out the comments in source code of the strategy.

Example (Moving from PVC to PVC)

~ ./korb --new-pvc-storage-class ontap-ssd redis-data-redis-master-0
DEBU[0000] Created client from kubeconfig                component=migrator kubeconfig=/home/jens/.kube/config
DEBU[0000] Got current namespace                         component=migrator namespace=prod-beryju-org
DEBU[0000] Got Source PVC                                component=migrator name=redis-data-redis-master-0 uid=e4b5476f-b965-4e81-bfee-d7cbbf4f6317
DEBU[0000] No new Name given, using old name             component=migrator
DEBU[0000] Compatible Strategies:                        component=migrator
DEBU[0000] Copy the PVC to the new Storage class and with new size and a new name, delete the old PVC, and copy it back to the old name.  component=migrator
DEBU[0000] Only one compatible strategy, running         component=migrator
DEBU[0000] Set timeout from PVC size                     component=strategy strategy=copy-twice-name timeout=8m0s
WARN[0000] This strategy assumes you've stopped all pods accessing this data.  component=strategy strategy=copy-twice-name
DEBU[0000] creating temporary PVC                        component=strategy stage=1 strategy=copy-twice-name
DEBU[0002] starting mover job                            component=strategy stage=2 strategy=copy-twice-name
DEBU[0004] Pod not in correct state yet                  component=mover-job phase=Pending
DEBU[0006] Pod not in correct state yet                  component=mover-job phase=Pending
[...]
[mover logs]: sending incremental file list
[mover logs]: ./
[mover logs]: appendonly.aof
              0 100%    0.00kB/s    0:00:00 (xfr#1, to-chk=1/3)
[mover logs]: dump.rdb
            175 100%    0.00kB/s    0:00:00 (xfr#2, to-chk=0/3)
DEBU[0022] Cleaning up successful job                    component=mover-job
DEBU[0022] deleting original PVC                         component=strategy stage=3 strategy=copy-twice-name
DEBU[0024] creating final destination PVC                component=strategy stage=4 strategy=copy-twice-name
DEBU[0024] starting mover job to final PVC               component=strategy stage=5 strategy=copy-twice-name
DEBU[0026] Pod not in correct state yet                  component=mover-job phase=Pending
DEBU[0028] Pod not in correct state yet                  component=mover-job phase=Pending
[...]
[mover logs]: sending incremental file list
[mover logs]: ./
[mover logs]: appendonly.aof
              0 100%    0.00kB/s    0:00:00 (xfr#1, to-chk=1/3)
[mover logs]: dump.rdb
            175 100%    0.00kB/s    0:00:00 (xfr#2, to-chk=0/3)
DEBU[0048] Cleaning up successful job                    component=mover-job
DEBU[0048] deleting temporary PVC                        component=strategy stage=6 strategy=copy-twice-name
INFO[0050] And we're done                                component=strategy strategy=copy-twice-name
INFO[0050] Cleaning up...                                component=strategy strategy=copy-twice-name

Example (Exporting from PVC to tar)

~ ./korb overseerr-config --strategy export
DEBU[0000] Created client from kubeconfig                component=migrator kubeconfig=/Users/jens/.kube/config
DEBU[0000] Got current namespace                         component=migrator namespace=overseerr
DEBU[0000] Got Source PVC                                component=migrator name=overseerr-config uid=8e94240d-3c36-4fb1-baf0-5da1f6c44210
DEBU[0000] No new Name given, using old name             component=migrator
INFO[0000] Strategy not compatible                       component=migrator error="Expected import file 'overseerr-config.tar' does not exist"
DEBU[0000] Compatible Strategies:                        component=migrator
DEBU[0000] Copy the PVC to the new Storage class and with new size and a new name, delete the old PVC, and copy it back to the old name.  component=migrator identifier=copy-twice-name
DEBU[0000] Export PVC content into a tar archive.        component=migrator identifier=export
DEBU[0000] User selected strategy                        component=migrator identifier=export
WARN[0000] This strategy assumes you've stopped all pods accessing this data.  component=strategy strategy=export
DEBU[0000] starting mover job                            component=strategy strategy=export
DEBU[0000] Pod not in correct state yet                  component=mover-job phase=Pending
[...]
DEBU[0036] mover pod running, starting copy              component=strategy strategy=export
tar: Removing leading `/' from member names
/source/
/source/db/
/source/db/db.sqlite3
⠧ downloading (110 kB, 43.824 kB/s) /source/db/db.sqlite3-shm
/source/db/db.sqlite3-wal
⠴ downloading (4.0 MB, 1.521 MB/s) /source/logs/
/source/logs/overseerr.log
/source/logs/.20136e5b8544ec13f7fc29ce3d35150d597108bb-audit.json
/source/logs/.d2109f103a9d757bc28894d508ee5579a3284e75-audit.json
/source/logs/.machinelogs.json
/source/logs/overseerr-2022-07-01.log.gz
/source/logs/overseerr-2022-07-05.log
⠦ downloading (4.2 MB, 1.521 MB/s) /source/logs/.machinelogs-2022-07-04.json.gz
/source/logs/overseerr-2022-05-24.log.gz
/source/logs/overseerr-2022-07-03.log.gz
/source/logs/overseerr-2022-06-29.log.gz
/source/logs/overseerr-2022-07-02.log.gz
/source/logs/overseerr-2022-05-25.log.gz
/source/logs/overseerr-2022-06-30.log.gz
/source/logs/overseerr-2022-07-04.log.gz
/source/logs/.machinelogs-2022-07-05.json
⠦ downloading (4.4 MB, 1.521 MB/s) /source/settings.json
INFO[0039] Finished copying                              component=strategy strategy=export
INFO[0039] Export at 'overseerr-config.tar'              component=strategy strategy=export
INFO[0039] Cleaning up...                                component=strategy strategy=export