.. This work is licensed under a Creative Commons Attribution 4.0
.. International License. http://creativecommons.org/licenses/by/4.0
.. Copyright © 2017-2020 Aarna Networks, Inc.
.. Links
.. Github web page to download the latest version of velero open source tool
.. _Velero official website: https://velero.io
.. Reference link with more details on Instructions for setting up Velero server
.. _Setup Velero Server: https://velero.io/docs/v1.5/contributions/minio/#set-up-server
Backup and Restore Solution
###########################
Problem Statement and Requirement (User Story)
==============================================
As an ONAP Operator- We require the ability to backup and restore ONAP state data, We want to have Disaster recovery solution for ONAP deployment done over K8.
Basic Use case would be
1) Add/Update/Modify the POD Data or DB Data.
2) Simulate a Disaster
3) Restore using Backup.
4) POD Data/DB entries should be recovered.
Solution Description
====================
Narrowed down upon a tool which can be used for K8 Backup and Restoration for ONAP deployments named as Velero (formerly Heptio-ARK)
Velero is an Opensource tool to back up and restore your Kubernetes cluster resources and persistent volumes. Velero lets you:
* Take backups of your cluster and restore in case of loss.
* Copy cluster resources across cloud providers. NOTE: Cloud volume migrations are not yet supported.
* Replicate your production environment for development and testing environments.
Velero consists of
* A server that runs on your cluster
* A command-line client that runs locally
Working Flow diagram
.. figure:: Backup-And-Restore.png
:align: center
Installation
============
Prerequisites
-------------
- Access to a Kubernetes cluster, version 1.7 or later.
- A DNS server on the cluster
- kubectl installed
- Labels should be defined there.
Install Velero Tool
~~~~~~~~~~~~~~~~~~~
Velero is an open source tool to safely backup and restore, perform disaster recovery, and migrate Kubernetes cluster resources and persistent volumes.
Go to `Velero official website`_ and Click on DOWNLOAD VELERO BUTTON. It will take you to the github page to download the latest version of velero. Scroll down to the
bottom of the page and choose the binary corresponding to the OS where you want to run the Velero on.
Install and configure Velero Server and Client
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
To configure the latest version (1.5.2) of velero on Linux machine, please follow the below steps.
Run the below command. It will download the velero to your machine
.. code-block:: bash
wget https://github.com/vmware-tanzu/velero/releases/download/v1.5.2/velero-v1.5.2-linux-amd64.tar.gz
Extract it using below command
.. code-block:: bash
tar -zxvf velero-v1.5.2-linux-amd64.tar.gz
Once extracted, goto the directory "velero-v1.5.2-linux-amd64"
.. code-block:: bash
cd velero-v1.5.2-linux-amd64
Inside this you will find a directory called examples and then minio, just go inside it
.. code-block:: bash
cd examples/minio
Inside this you will find a file called 00-minio-deployment.yaml. Open this file using any editor and look for Velero service yaml portion, there you need to change
the type from ClusterIP to NodePort
Once made the changes then run the below command to deploy velero server
.. code-block:: bash
kubectl apply -f 00-minio-deployment.yaml
This will configure the Velero with Minio. Minio is nothing but local storage with aws s3 capabilities. Velero support many cloud providers as well like Azure,AWS,GCP
etc. You can configure any of those.
Once the Velero deployment is done, then we need to install and configure the velero server component using velero cli.
Create a Velero-specific credentials file (credentials-velero) in your local directory
.. code-block:: bash
[default]
aws_access_key_id=minio
aws_secret_access_key=minio123
Start the server and the local storage service. In the Velero directory, run
.. code-block:: bash
./velero install \
--provider aws \
--plugins velero/velero-plugin-for-aws:v1.0.0 \
--bucket velero \
--secret-file ./credentials-velero \
--use-volume-snapshots=false \
--backup-location-config region=minio,s3ForcePathStyle="true",s3Url=http://minio.velero.svc:9000
--use-restic
Refer this for more details: `Setup Velero Server`_
.. note::
As Labels need to be defined, because that is a unique identity which we need to have for any backup of our k8 containers,
So in OOM code, Where -ever we don't have labels, We need to define that whether its configmap or secret, for eg below:-
labels:
app: {{ include "common.name" . }}
chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}
release: {{ .Release.Name }}
heritage: {{ .Release.Service }}
Running Velero Example (Backup and Restoration with Logs)
---------------------------------------------------------
1) Install SO component
~~~~~~~~~~~~~~~~~~~~~~~
.. note::
This is an optional step, if you have already installed SO or all other components of ONAP then you can skip this step.
Below is the example of installing SO component using helm
.. code-block:: bash
helm install so -n bkup --namespace test3
NAME: bkup
LAST DEPLOYED: Fri Jul 20 06:59:09 2018
NAMESPACE: test3
STATUS: DEPLOYED
RESOURCES:
==> v1/Pod(related)
NAME READY STATUS RESTARTS AGE
bkup-so-db-744fccd888-w67zk 0/1 Init:0/1 0 0s
bkup-so-7668c746c-vngk8 0/2 Init:0/1 0 0s
==> v1/Secret
NAME TYPE DATA AGE
bkup-so-db Opaque 1 0s
==> v1/ConfigMap
NAME DATA AGE
confd-configmap 1 0s
so-configmap 5 0s
so-docker-file-configmap 1 0s
so-filebeat-configmap 1 0s
so-log-configmap 11 0s
==> v1/PersistentVolume
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
bkup-so-db 2Gi RWX Retain Bound test3/bkup-so-db 0s
==> v1/PersistentVolumeClaim
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
bkup-so-db Bound bkup-so-db 2Gi RWX 0s
==> v1/Service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
so-db NodePort 10.43.63.96 <none> 3306:30252/TCP 0s
so NodePort 10.43.59.93 <none> 8080:30223/TCP,3904:30225/TCP,3905:30224/TCP,9990:30222/TCP,8787:30250/TCP 0s
==> v1beta1/Deployment
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
bkup-so-db 1 1 1 0 0s
bkup-so 1 1 1 0 0s
.. note::
Get the application URL by running these commands
.. code-block:: bash
export NODE_PORT=$(kubectl get --namespace test3 -o jsonpath="{.spec.ports[0].nodePort}" services so)
export NODE_IP=$(kubectl get nodes --namespace test3 -o jsonpath="{.items[0].status.addresses[0].address}")
echo http://$NODE_IP:$NODE_PORT
2) Checking status of pod
~~~~~~~~~~~~~~~~~~~~~~~~~
.. code-block:: bash
kubectl get pods --all-namespaces | grep -i so
NAMESPACE NAME READY STATUS RESTARTS AGE
test3 bkup-so-7668c746c-vngk8 2/2 Running 0 8m
test3 bkup-so-db-744fccd888-w67zk 1/1 Running 0 8m
3) Creating backup of deployment
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Here I am using selector label as release name
.. code-block:: bash
./velero backup create so-backup --selector release=bkup
Backup request "so-backup" submitted successfully.
Run `velero backup describe so-backup` for more details.
4) Checking backup logs
~~~~~~~~~~~~~~~~~~~~~~~
.. code-block:: bash
./velero backup describe so-backup
Name: so-backup
Namespace: velero
Labels: <none>
Annotations: <none>
Phase: Completed
Namespaces:
Included: *
Excluded: <none>
Resources:
Included: *
Excluded: <none>
Cluster-scoped: auto
Label selector: release=bkup
Snapshot PVs: auto
TTL: 720h0m0s
Hooks: <none>
Backup Format Version: 1
Started: 2018-07-20 07:09:51 +0000 UTC
Completed: 2018-07-20 07:09:53 +0000 UTC
Expiration: 2018-08-19 07:09:51 +0000 UTC
Validation errors: <none>
Persistent Volumes: <none included>
5) Simulating a disaster
~~~~~~~~~~~~~~~~~~~~~~~~
.. code-block:: bash
helm delete --purge bkup
release "bkup" deleted
6)Restoring the kubernetes resources using velero
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. code-block:: bash
./velero restore create --from-backup so-backup
Restore request "so-backup-20180720071236" submitted successfully.
Run `velero restore describe so-backup-20180720071236` for more details.
7) Checking restoration logs
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. code-block:: bash
./velero restore describe so-backup-20180720071236
Name: so-backup-20180720071236
Namespace: velero
Labels: <none>
Annotations: <none>
Backup: so-backup
Namespaces:
Included: *
Excluded: <none>
Resources:
Included: *
Excluded: nodes, events, events.events.k8s.io, backups.ark.heptio.com, restores.ark.heptio.com
Cluster-scoped: auto
Namespace mappings: <none>
Label selector: <none>
Restore PVs: auto
Phase: Completed
Validation errors: <none>
Warnings: <none>
Errors: <none>
8)Check backup files
~~~~~~~~~~~~~~~~~~~~
As we are using Minio which is local storage with aws s3 capabilities. Thus our all the backup files are being stored in locally in Minio Pod. Let's see where the backup files are being genreted.
.. code-block:: bash
kubectl get pod -n velero
NAME READY STATUS RESTARTS AGE
minio-d9c56ff5-cg8zp 1/1 Running 0 4d5h
minio-setup-ph8pk 0/1 Completed 0 4d5h
velero-74cdf64d76-t8wfs 1/1 Running 0 4d5h
.. code-block:: bash
kubectl exec -it -n velero minio-d9c56ff5-cg8zp ls storage/velero/backups/
so-backup
aarna@anod-master:~$
kubectl exec -it -n velero minio-d9c56ff5-cg8zp ls storage/velero/backups/so-backup
so-backup-csi-volumesnapshotcontents.json.gz
so-backup-csi-volumesnapshots.json.gz
so-backup-logs.gz
so-backup-podvolumebackups.json.gz
so-backup-resource-list.json.gz
so-backup-volumesnapshots.json.gz
so-backup.tar.gz
velero-backup.json
9) Restore run
~~~~~~~~~~~~~~
.. code-block:: bash
./velero restore get
NAME BACKUP STATUS WARNINGS ERRORS CREATED SELECTOR
so-backup-20180720071236 so-backup Completed 0 0 2018-07-20 07:12:36 +0000 UTC <none>
10) Check the pod status
~~~~~~~~~~~~~~~~~~~~~~~~
.. code-block:: bash
kubectl get pods --all-namespaces | grep -i so
NAMESPACE NAME READY STATUS RESTARTS AGE
test3 bkup-so-7668c746c-vngk8 2/2 Running 0 8m
test3 bkup-so-db-744fccd888-w67zk 1/1 Running 0 8m
Another Example with DB and PV Backup
-------------------------------------
APPC component backup and restoration
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. code-block:: bash
kubectl get pods --all-namespaces | grep -i appc
onap bk-appc-0 1/2 Running 0 1m
onap bk-appc-cdt-7cd6f6d674-5thwj 1/1 Running 0 1m
onap bk-appc-db-0 2/2 Running 0 1m
onap bk-appc-dgbuilder-59895d4d69-7rp9q 1/1 Running 0 1m
Creating dummy entry in db
~~~~~~~~~~~~~~~~~~~~~~~~~~
.. code-block:: bash
kubectl exec -it -n default bk-appc-db-0 bash
Defaulting container name to appc-db.
Use 'kubectl describe pod/bk-appc-db-0 -n onap' to see all of the containers in this pod.
root@bk-appc-db-0:/#
root@bk-appc-db-0:/#
root@bk-appc-db-0:/#
root@bk-appc-db-0:/# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 42
Server version: 5.7.23-log MySQL Community Server (GPL)
Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>
mysql>
mysql>
mysql> connect mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Connection id: 44
Current database: mysql
mysql>
mysql>
mysql> select * from servers;
Empty set (0.00 sec)
mysql> desc servers;
+-------------+----------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------------+----------+------+-----+---------+-------+
| Server_name | char(64) | NO | PRI | | |
| Host | char(64) | NO | | | |
| Db | char(64) | NO | | | |
| Username | char(64) | NO | | | |
| Password | char(64) | NO | | | |
| Port | int(4) | NO | | 0 | |
| Socket | char(64) | NO | | | |
| Wrapper | char(64) | NO | | | |
| Owner | char(64) | NO | | | |
+-------------+----------+------+-----+---------+-------+
9 rows in set (0.00 sec)
mysql> insert into servers values ("test","ab","sql","user","pwd",1234,"test","wrp","vaib");
Query OK, 1 row affected (0.03 sec)
mysql>
mysql>
mysql>
mysql> select * from servers;
+-------------+------+-----+----------+----------+------+--------+---------+-------+
| Server_name | Host | Db | Username | Password | Port | Socket | Wrapper | Owner |
+-------------+------+-----+----------+----------+------+--------+---------+-------+
| abc | ab | sql | user | pwd | 1234 | test | wrp | vaib |
+-------------+------+-----+----------+----------+------+--------+---------+-------+
1 row in set (0.00 sec)
mysql>
mysql>
mysql> exit
Bye
root@bk-appc-db-0:/#
root@bk-appc-db-0:/#
root@bk-appc-db-0:/# exit
command terminated with exit code 127
kubectl get pods --all-namespaces | grep -i appc
onap bk-appc-0 1/2 Running 0 5m
onap bk-appc-cdt-7cd6f6d674-5thwj 1/1 Running 0 5m
onap bk-appc-db-0 2/2 Running 0 5m
onap bk-appc-dgbuilder-59895d4d69-7rp9q 1/1 Running 0 5m
Creating dummy file in APPC PV
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. code-block:: bash
kubectl exec -it -n onap bk-appc-0 bash
Defaulting container name to appc.
Use 'kubectl describe pod/bk-appc-0 -n onap' to see all of the containers in this pod.
root@bk-appc-0:/#
root@bk-appc-0:/#
root@bk-appc-0:/#
root@bk-appc-0:/# cd /opt/opendaylight/current/daexim/
root@bk-appc-0:/opt/opendaylight/current/daexim# ls
root@bk-appc-0:/opt/opendaylight/current/daexim# ls
root@bk-appc-0:/opt/opendaylight/current/daexim#
root@bk-appc-0:/opt/opendaylight/current/daexim#
root@bk-appc-0:/opt/opendaylight/current/daexim# touch abc.txt
root@bk-appc-0:/opt/opendaylight/current/daexim# ls
abc.txt
root@bk-appc-0:/opt/opendaylight/current/daexim# exit
exit
root@rancher:~/oom/kubernetes# kubectl get pods --all-namespaces | grep -i appc
onap bk-appc-0 1/2 Running 0 6m
onap bk-appc-cdt-7cd6f6d674-5thwj 1/1 Running 0 6m
onap bk-appc-db-0 2/2 Running 0 6m
onap bk-appc-dgbuilder-59895d4d69-7rp9q 1/1 Running 0 6m
Creating backup using velero
~~~~~~~~~~~~~~~~~~~~~~~~
.. code-block:: bash
./velero backup create appc-bkup1 --selector release=bk
Backup request "appc-bkup1" submitted successfully.
Run `velero backup describe appc-bkup1` for more details.
./velero backup describe appc-bkup1
Name: appc-bkup1
Namespace: velero
Labels: <none>
Annotations: <none>
Phase: Completed
Namespaces:
Included: *
Excluded: <none>
Resources:
Included: *
Excluded: <none>
Cluster-scoped: auto
Label selector: release=bk
Snapshot PVs: auto
TTL: 720h0m0s
Hooks: <none>
Backup Format Version: 1
Started: 2018-08-27 05:07:45 +0000 UTC
Completed: 2018-08-27 05:07:47 +0000 UTC
Expiration: 2018-09-26 05:07:44 +0000 UTC
Validation errors: <none>
Persistent Volumes: <none included>
Simulating disaster by deleting APPC
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. code-block:: bash
helm delete --purge bk
release "bk" deleted
Restoration using velero
~~~~~~~~~~~~~~~~~~~~~~
.. code-block:: bash
./velero restore create --from-backup appc-bkup1
Restore request "appc-bkup1-20180827052651" submitted successfully.
Run `velero restore describe appc-bkup1-20180827052651` for more details.
Restoration details
~~~~~~~~~~~~~~~~~~~
Check the Restoration details immediately after restoration. Restoration process is in InProgress Phase. Please check the Phase.
.. code-block:: bash
./velero restore describe appc-bkup1-20180827052651
Name: appc-bkup1-20180827052651
Namespace: velero
Labels: <none>
Annotations: <none>
Backup: appc-bkup1
Namespaces:
Included: *
Excluded: <none>
Resources:
Included: *
Excluded: nodes, events, events.events.k8s.io, backups.ark.heptio.com, restores.ark.heptio.com
Cluster-scoped: auto
Namespace mappings: <none>
Label selector: <none>
Restore PVs: auto
Phase: InProgress
Validation errors: <none>
Warnings: <none>
Errors: <none>
./velero restore describe appc-bkup1-20180827052651
Name: appc-bkup1-20180827052651
Namespace: velero
Labels: <none>
Annotations: <none>
Backup: appc-bkup1
Namespaces:
Included: *
Excluded: <none>
Resources:
Included: *
Excluded: nodes, events, events.events.k8s.io, backups.ark.heptio.com, restores.ark.heptio.com
Cluster-scoped: auto
Namespace mappings: <none>
Label selector: <none>
Restore PVs: auto
Phase: Completed
Validation errors: <none>
Warnings: <error getting warnings: Get "http://minio.velero.svc:9000/velero/restores/dev-appc-1-20201108164330/restore-dev-appc-1-20201108164330-results.gz?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=minio%2F20201108%2Fminio%2Fs3%2Faws4_request&X-Amz-Date=20201108T183923Z&X-Amz-Expires=600&X-Amz-SignedHeaders=host&X-Amz-Signature=847bdbb0a76718220c40767c4837aa999a4da9ff1344e9b42d3c93f7009e6898": dial tcp: lookup minio.velero.svc on 127.0.0.53:53: no such host>
Errors: <error getting errors: Get "http://minio.velero.svc:9000/velero/restores/dev-appc-1-20201108164330/restore-dev-appc-1-20201108164330-results.gz?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=minio%2F20201108%2Fminio%2Fs3%2Faws4_request&X-Amz-Date=20201108T183923Z&X-Amz-Expires=600&X-Amz-SignedHeaders=host&X-Amz-Signature=847bdbb0a76718220c40767c4837aa999a4da9ff1344e9b42d3c93f7009e6898": dial tcp: lookup minio.velero.svc on 127.0.0.53:53: no such host>
This process might take some time to complete. When you check the Restoration details again after some time then the phase will show as Completed as shown below.
.. code-block:: bash
./velero restore describe appc-bkup1-20180827052651
Name: appc-bkup1-20180827052651
Namespace: velero
Labels: <none>
Annotations: <none>
Backup: appc-bkup1
Namespaces:
Included: *
Excluded: <none>
Resources:
Included: *
Excluded: nodes, events, events.events.k8s.io, backups.ark.heptio.com, restores.ark.heptio.com
Cluster-scoped: auto
Namespace mappings: <none>
Label selector: <none>
Restore PVs: auto
Phase: Completed
Validation errors: <none>
Warnings: <error getting warnings: Get "http://minio.velero.svc:9000/velero/restores/dev-appc-1-20201108164330/restore-dev-appc-1-20201108164330-results.gz?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=minio%2F20201108%2Fminio%2Fs3%2Faws4_request&X-Amz-Date=20201108T183923Z&X-Amz-Expires=600&X-Amz-SignedHeaders=host&X-Amz-Signature=847bdbb0a76718220c40767c4837aa999a4da9ff1344e9b42d3c93f7009e6898": dial tcp: lookup minio.velero.svc on 127.0.0.53:53: no such host>
Errors: <error getting errors: Get "http://minio.velero.svc:9000/velero/restores/dev-appc-1-20201108164330/restore-dev-appc-1-20201108164330-results.gz?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=minio%2F20201108%2Fminio%2Fs3%2Faws4_request&X-Amz-Date=20201108T183923Z&X-Amz-Expires=600&X-Amz-SignedHeaders=host&X-Amz-Signature=847bdbb0a76718220c40767c4837aa999a4da9ff1344e9b42d3c93f7009e6898": dial tcp: lookup minio.velero.svc on 127.0.0.53:53: no such host>
List of restores
~~~~~~~~~~~~~~~~
.. code-block:: bash
ark restore get
NAME BACKUP STATUS WARNINGS ERRORS CREATED SELECTOR
appc-bkup-20180827045955 appc-bkup Completed 2 0 2018-08-27 04:59:52 +0000 UTC <none>
appc-bkup1-20180827052651 appc-bkup1 Completed 5 0 2018-08-27 05:26:48 +0000 UTC <none>
vid-bkp-20180824053001 vid-bkp Completed 149 2 2018-08-24 05:29:59 +0000 UTC <none>
Completed status means the Restoration is done successfully.
Restoration successful
~~~~~~~~~~~~~~~~~~~~~~
.. code-block:: bash
kubectl get pods --all-namespaces | grep -i appc
onap bk-appc-0 1/2 Running 0 26m
onap bk-appc-cdt-7cd6f6d674-5thwj 1/1 Running 0 26m
onap bk-appc-db-0 2/2 Running 0 26m
onap bk-appc-dgbuilder-59895d4d69-7rp9q 1/1 Running 0 26m
kubectl exec -it -n onap bk-appc-db-0 bash
Defaulting container name to appc-db.
Use 'kubectl describe pod/bk-appc-db-0 -n onap' to see all of the containers in this pod.
root@bk-appc-db-0:/#
root@bk-appc-db-0:/#
root@bk-appc-db-0:/#
Restoration of db successful
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. code-block:: bash
root@bk-appc-db-0:/# mysql -u root
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
root@bk-appc-db-0:/# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 335
Server version: 5.7.23-log MySQL Community Server (GPL)
Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> connect mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Connection id: 337
Current database: mysql
mysql> select * from servers;
+-------------+------+-----+----------+----------+------+--------+---------+-------+
| Server_name | Host | Db | Username | Password | Port | Socket | Wrapper | Owner |
+-------------+------+-----+----------+----------+------+--------+---------+-------+
| abc | ab | sql | user | pwd | 1234 | test | wrp | vaib |
+-------------+------+-----+----------+----------+------+--------+---------+-------+
1 row in set (0.00 sec)
mysql> quit
Bye
root@bk-appc-db-0:/# exit
exit
Restoration of PV successful
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. code-block:: bash
kubectl get pods --all-namespaces | grep -i appc
onap bk-appc-0 1/2 Running 0 27m
onap bk-appc-cdt-7cd6f6d674-5thwj 1/1 Running 0 27m
onap bk-appc-db-0 2/2 Running 0 27m
onap bk-appc-dgbuilder-59895d4d69-7rp9q 1/1 Running 0 27m
kubectl exec -it -n onap bk-appc-0 bash
Defaulting container name to appc.
Use 'kubectl describe pod/bk-appc-0 -n onap' to see all of the containers in this pod.
root@bk-appc-0:/#
root@bk-appc-0:/#
root@bk-appc-0:/#
root@bk-appc-0:/#
root@bk-appc-0:/# cd /opt/opendaylight/current/daexim/
root@bk-appc-0:/opt/opendaylight/current/daexim# ls
abc.txt
root@bk-appc-0:/opt/opendaylight/current/daexim#
root@bk-appc-0:/opt/opendaylight/current/daexim#
root@bk-appc-0:/opt/opendaylight/current/daexim# exit
exit
Use Cases
---------
Disaster recovery
~~~~~~~~~~~~~~~~~
Using Schedules and Restore-Only Mode
If you periodically back up your cluster’s resources, you are able to return to a previous state in case of some unexpected mishap, such as a service outage.
Cluster migration
~~~~~~~~~~~~~~~~~
Using Backups and Restores
Velero can help you port your resources from one cluster to another, as long as you point each Velero Config to the same cloud object storage.
References:
https://github.com/vmware-tanzu/velero