Using csi snapshot.pptx

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CSI snapshots for
backing up your
application

What we’ll
see
Why you need snapshot to make good
backup
What’s CSI
Using CSI snapshot to take backup of
your namespace
Li...

Filesystem copy vs
Snapshot
Why doing a Filesystem
copy for backup is bad
Snapshot is better but
it’s often not enough

PVC
F1 F2 F3
F4 F5 F6

PVC
F1 F2 F3
F4 F5 F6

PVC
F1 F2 F3
F4 F5 F6

PVC
F1 F2 F3
F4 F5 F6

PVC
F1 F2 F3
F4 F5 F6
A snapshot capture all the files in the same time : it’s crash consistent

PVC
F1 F2 F3
F4 F5 F6
Filesystem copy can lead you to discrepancies because F6 was captured
after F1 and situation continu...

Snapshot can be crash consistent but not
necessary application consistent : ie Kafka
Kafka use OS Virtual Memory and write...

Take away
• Better using Snapshot than filesystem copy
• Unless you can freeze
• Snapshot is crash consistent but not nece...

From « in
tree »
storage to
CSI
• How work dynamic storage provisionning
• The issue with « in tree » driver
• Enter CSI
•...

For each Storage Provisionner an « in tree »
driver
• awsElasticBlockStore
• azureDisk
• azureFile
• Cephfs
• Cinder
• fib...

Issue with « in tree »
• As a storage provider you have to add your code in the kubernetes « code tree » : in the branches...

Take away
• CSI let any storage vendor register to k8S
• CSI decouple storage vendor code to K8S code
• Most of the sideca...

Create a Snap with CSI

Restore from a snap

VolumeSnapshot &
volumeSnapshotContent

Create a snap script
for the whole
namespace

Take away
• CSI let you create snapshot with k8s API
• Any application that want to manage backup don’t
need anymore secre...

Limitations
• Snap is often not enough for application consistency
• Snap are not durable backup
• We need more than backu...

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