Customizing Backup and Restore Process
KubeStash provides rich customization supports for the backup and restore process to meet the requirements of various cluster configurations. This guide will show you some examples of these customizations.
Customizing Backup Process
In this section, we are going to show you how to customize the backup process. Here, we are going to show some examples of providing arguments to the backup process, running the backup process as a specific user, ignoring some indexes during the backup process, etc.
Passing arguments to the backup process
KubeStash MongoDB addon uses mongoump for backup. You can pass arguments to the mongodump through args param under spec.sessions.addon.tasks[0].params section.
The below example shows how you can pass the --db testdb to take backup for a specific mongodb databases named testdb.
apiVersion: core.kubestash.com/v1alpha1
kind: BackupConfiguration
metadata:
name: mg
namespace: demo
spec:
target:
apiGroup: kubedb.com
kind: MongoDB
namespace: demo
name: sample-mongodb
backends:
- name: s3-backend
storageRef:
namespace: demo
name: s3-storage
retentionPolicy:
name: backup-rp
namespace: demo
sessions:
- name: frequent
scheduler:
schedule: "*/5 * * * *"
jobTemplate:
backoffLimit: 1
repositories:
- name: s3-repo
backend: s3-backend
directory: /mongodb
encryptionSecret:
name: encry-secret
namespace: demo
addon:
name: mongodb-addon
tasks:
- name: logical-backup
params:
args: "--db=testdb"
WARNING: Make sure that you have the specific database created before taking backup. In this case, Database
testdbshould exist before the backup job starts.
Running backup job as a specific user
If your cluster requires running the backup job as a specific user, you can provide securityContext under spec.sessions.addon.tasks[0].jobTemplate.spec section. The below example shows how you can run the backup job as the root user.
apiVersion: core.kubestash.com/v1alpha1
kind: BackupConfiguration
metadata:
name: mg
namespace: demo
spec:
target:
apiGroup: kubedb.com
kind: MongoDB
namespace: demo
name: sample-mongodb
backends:
- name: s3-backend
storageRef:
namespace: demo
name: s3-storage
retentionPolicy:
name: backup-rp
namespace: demo
sessions:
- name: frequent
scheduler:
jobTemplate:
backoffLimit: 1
schedule: "*/5 * * * *"
repositories:
- name: s3-repo
backend: s3-backend
directory: /mongodb
encryptionSecret:
name: encry-secret
namespace: demo
addon:
name: mongodb-addon
tasks:
- name: logical-backup
jobTemplate:
spec:
securityContext:
runAsUser: 0
runAsGroup: 0
Specifying Memory/CPU limit/request for the backup job
If you want to specify the Memory/CPU limit/request for your backup job, you can specify resources field under spec.sessions.addon.containerRuntimeSettings section.
apiVersion: core.kubestash.com/v1alpha1
kind: BackupConfiguration
metadata:
name: mg
namespace: demo
spec:
target:
apiGroup: kubedb.com
kind: MongoDB
namespace: demo
name: sample-mongodb
backends:
- name: s3-backend
storageRef:
namespace: demo
name: s3-storage
retentionPolicy:
name: backup-rp
namespace: demo
sessions:
- name: frequent
scheduler:
jobTemplate:
backoffLimit: 1
schedule: "*/3 * * * *"
repositories:
- name: s3-repo
backend: s3-backend
directory: /mongodb
encryptionSecret:
name: encry-secret
namespace: demo
addon:
name: mongodb-addon
tasks:
- name: logical-backup
containerRuntimeSettings:
resources:
requests:
cpu: "200m"
memory: "1Gi"
limits:
cpu: "200m"
memory: "1Gi"
Customizing Restore Process
KubeStash also uses mongorestore during the restore process. In this section, we are going to show how you can pass arguments to the restore process, restore a specific snapshot, run restore job as a specific user, etc.
Passing arguments to the restore process
Similar to the backup process, you can pass arguments to the restore process through the args params under spec.addon.tasks[0].params section. This example will restore data from database testdb.
apiVersion: core.kubestash.com/v1alpha1
kind: RestoreSession
metadata:
name: mg-restore
namespace: demo
spec:
target:
name: restore-mongodb
namespace: demo
apiGroup: kubedb.com
kind: MongoDB
dataSource:
snapshot: latest
repository: s3-repo
encryptionSecret:
name: encry-secret
namespace: demo
addon:
name: mongodb-addon
tasks:
- name: logical-backup-restore
params:
args: "--db=testdb"
Restore specific snapshot
You can also restore a specific snapshot. At first, list the available snapshot as bellow,
❯ kubectl get snapshots -n demo
NAMESPACE NAME REPOSITORY SESSION SNAPSHOT-TIME DELETION-POLICY PHASE VERIFICATION-STATUS AGE
demo s3-repo-mg-frequent-1702291682 s3-repo frequent 2023-12-11T10:48:10Z Delete Succeeded 82m
demo s3-repo-mg-frequent-1702291685 s3-repo frequent 2023-12-11T10:49:10Z Delete Succeeded 82m
The below example shows how you can pass a specific snapshot id through the snapshots filed of spec.dataSource section.
apiVersion: core.kubestash.com/v1alpha1
kind: RestoreSession
metadata:
name: mg-restore
namespace: demo
spec:
target:
name: restore-mongodb
namespace: demo
apiGroup: kubedb.com
kind: MongoDB
dataSource:
snapshot: s3-repo-mg-frequent-1702291682
repository: s3-repo
encryptionSecret:
name: encry-secret
namespace: demo
addon:
name: mongodb-addon
tasks:
- name: logical-backup-restore
Please, do not specify multiple snapshots here. Each snapshot represents a complete backup of your database. Multiple snapshots are only usable during file/directory restore.
Running restore job as a specific user
You can provide securityContext under spec.addon.tasks.jobTemplate.spec section to run the restore job as a specific user.
apiVersion: core.kubestash.com/v1alpha1
kind: RestoreSession
metadata:
name: mg-restore
namespace: demo
spec:
target:
name: restore-mongodb
namespace: demo
apiGroup: kubedb.com
kind: MongoDB
dataSource:
snapshot: latest
repository: s3-repo
encryptionSecret:
name: encry-secret
namespace: demo
addon:
name: mongodb-addon
tasks:
- name: logical-backup-restore
jobTemplate:
spec:
securityContext:
runAsUser: 0
runAsGroup: 0
Specifying Memory/CPU limit/request for the restore job
Similar to the backup process, you can also provide resources field under the spec.addon.containerRuntimeSettings section to limit the Memory/CPU for your restore job.
apiVersion: core.kubestash.com/v1alpha1
kind: RestoreSession
metadata:
name: mg-restore
namespace: demo
spec:
target:
name: restore-mongodb
namespace: demo
apiGroup: kubedb.com
kind: MongoDB
dataSource:
snapshot: latest
repository: s3-repo
encryptionSecret:
name: encry-secret
namespace: demo
addon:
name: mongodb-addon
tasks:
- name: logical-backup-restore
containerRuntimeSettings:
resources:
requests:
cpu: "200m"
memory: "1Gi"
limits:
cpu: "200m"
memory: "1Gi"
Cleanup
To cleanup the resources crated by this tutorial, run the following commands,
❯ kubectl delete backupconfiguration -n demo <backup-configuration-name>
❯ kubectl delete restoresession -n demo <restore-session-name>