Persistent Storage

Question 1

three primary components of storage architecture

Answer 1

1) storage classes
2) PV
3) PVC

Question 2

Example of NAS Storage (file storage)

Answer 2

1) Network File System (NFS)

2) Server Message Block (SMB)

3) Common Internet File System (CIFS)

Question 3

Examples of block storage

Answer 3

1) Storage Area Networks (SAN)

2) Amazon Elastic Block Store (EBS)

3) Google Cloud Persistent Disk

Question 4

Example object storage

Answer 4

1) Amazon Simple Storage Service (S3)

2) Red Hat Ceph Storage

3) OpenStack Object Storage (Swift)

Question 5

shared storage

Answer 5

File or Object

Question 6

Different access modes

Answer 6

Question 7

Storage class CR

Answer 7

Question 8

two options to manage NFS persistent volumes

Answer 8

1) Playbook automation
2) Operator or custom provisioner

Question 9

What provisioner to use for storage class for a volume plug-in that does not have a corresponding provisioner

Answer 9

kubernetes.io/no-provisioner

Question 10

What is the ebs provisioner?

Answer 10

kubernetes.io/aws-ebs

Question 11

what is the vmware vsphere provisioner?

Answer 11

kubernetes.io/vsphere-volume

Question 12

OpenShift does not have support for NFS persistent volumes. True or False

Answer 12

True. Only has support for sharable NFS
Persistent volume supported is Azure File

Question 13

Configure a storageclass as default

Answer 13

oc annotate storageclass standard \
–overwrite “storageclass.kubernetes.io/is-default-class=true”

Question 14

What happens if you configure multiple storage class as default

Answer 14

If more than one default exists, OpenShift will not provision a PV for a PVC that does not specify a storage class.

Question 15

How do you restrict access to a storage type?

Answer 15

Create quota

Question 16

Field to define max disk size for a specific storage class

Answer 16

//storage-class-name//.storageclass.storage.k8s.io/ requests.storage

Question 17

Field to define max number of pvc for a specific storage class

Answer 17

//storage-class-name//.storageclass.storage.k8s.io/ persistentvolumeclaims

Question 18

Create a storage quota for current project

Answer 18

c create quota storage
–hard requests.storage=5G,persistentvolumeclaims=3

Question 19

Key characteristic of block storage

Answer 19

stores data in fixed-size blocks

Question 20

Examples of block storage

Answer 20

1) HDD,
2) SAN,
3) SSD,
4) iSCSI
5) Fibre Channel
6) Amazon Elastic Block Store (EBS),
7) Google Persistent Disk
8) Azure Disks

Question 21

Block storage PV CR

Answer 21

Question 22

Block storage PVC CR

Answer 22

Question 23

All block storage in Kubernetes and OpenShift has a ReadWriteOnce access mode. True or False

Answer 23

True

Question 24

Local block storage PV CR

Answer 24

Question 25

Define local volume to configure local volume operator

Answer 25

Question 26

In what namespace do you instance LocalVolume CR?

Answer 26

In the namespace where local volume operator is installed. oc get clusterserviceversions --all-namespaces