Easy Installer Database Restores

As we are using kubernetes to host databases, so approach is different to restore database

Refer the following link to take backup of the databases:

Neo4j Restore

copy backup folder from the azure storage account to the pod which you will create with the below manifest, this pod will mount same pv where data is present of neo4j.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: ubuntu-deployment
  labels:
    app: ubuntu
spec:
  replicas: 1
  selector:
    matchLabels:
      app: ubuntu
  template:
    metadata:
      labels:
        app: ubuntu
    spec:
      containers:
      - name: ubuntu
        image: ubuntu
        command: ["sleep", "123456"]
        volumeMounts:
        - mountPath: /data
          name: neo4j-data
      volumes:
      - name: neo4j-data
        persistentVolumeClaim:
          claimName: neo4j-claim

scale neo4j deployment to 0
```
kubectl command
```
Go inside the pod which you created with the manifest, navigate to /data/databases, rename graph.db to graph.db.backup and paste the graph.db folder at same location. Exit from the pod
```
kubectl command to login
cd /data/databases
mv 
cp
```
Scale again neo4j pod to 1 which will load the data from the backup data
```
kubectl command to setup replicas to 1
```
Remove deployment which was created to restore neo4j backup

Elasticsearch Restore

As we took elasticsearch backup with help of azure plugin

Commands to login to the pod

create repository with following command

curl -XPUT 'http://localhost:9200/_snapshot/azurebackup' -H 'Content-Type: application/json' -d '{ "type": "azure", "settings": { "container": "<blob_name>", "base_path": "<storage_account_name>"} }'

restore the snapshot with below command

curl -XPOST 'http://localhost:9200/_snapshot/azurebackup/snapshot_1/_restore'

checking status of the snapshot restore

curl -s "http://localhost:9200/_snapshot/azurebackup/snapshot_1/_status?pretty"

Cassandra Restore

Download restore script from below url

https://sunbirdstagingpublic.blob.core.windows.net/dbrestorescripts/restore.py

Download backup from storage account and untar the backup

Copy backup folder to pod at location /bitnami/cassandra

kubectl cp backupfolder sunbird/cassandra-0:/bitnami/cassandra/

Copy restore script also which you have downloaded from the url to the pod and place it to /bitnami/cassandra
```
kubectl cp restore.py sunbird/cassandra-0:/bitnami/cassandra/ 
```
Restore schema got to backupfolder eg. /bitnami/cassandra/cassandrabackup, you will find db_schema.cql. Use below command
```
cqlsh -f db_schema.cql
```

Use below command to restore

python3 restore.py --snapshotdir /bitnami/cassandra/cassandrabackupfolder --datadirectory /bitnami/cassandra/data/data/

Restart the statefulset once operations is done

kubectl rollout restart statefulsets cassandra -n sunbird

Validate data by using cqlsh
Delete backup folder which you have copied earlier you can delete restore.py script

Redis Restore

Download required backup from azure storage account and uncompress file

Copy backup to redis pod at location /data

kubectl cp dump.rdb sunbird/redis-master-0:/data

go to /data/appendonlydir you will see one rdb file eg. appendonly.aof.1.base.rdb , take copy of that file or rename same by appending backup to file name
rename downloded rdb file with the same name eg if the file name inside appendonlydir is appendonly.aof.1.base.rdb then rename your dump.rdb to the same name
Past that rdb to the /data/appendonlydir

restart statefulset

kubectl rollout restart statefulsets redis -n sunbird

Postgres Restore

Download required backup from azure storage account and uncompress backup file
Copy backup to /bitnami/postgresql directory inside file or you can connect database remotely and do a restore
```
kubectl cp backup.sql sunbird/postgres-0:/bitnami/postgresql
```
Use below command to restore inside the postgres pod
```
psql -U username --file=backupfile.sql
```
Validate databases