Snapshot and restore in Elasticsearch - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a snapshot in Elasticsearch?

A snapshot is a backup of your Elasticsearch cluster data and metadata, stored in a repository. It helps you save the current state to restore later if needed.

beginner

How do you create a snapshot repository in Elasticsearch?

You create a snapshot repository by sending a PUT request to Elasticsearch with repository settings, like type (e.g., 'fs' for file system) and location path.

beginner

What is the purpose of restoring a snapshot?

Restoring a snapshot recovers your cluster data and settings from a saved backup, useful after data loss or to move data between clusters.

intermediate

Can you take snapshots while Elasticsearch is running and serving requests?

Yes, snapshots are taken without stopping the cluster. Elasticsearch uses a consistent view of data, so backups do not interrupt normal operations.

intermediate

What types of repositories can be used for snapshots in Elasticsearch?

Common repository types include 'fs' (file system), 's3' (Amazon S3), 'gcs' (Google Cloud Storage), and 'azure' (Microsoft Azure Blob Storage).

What command creates a snapshot repository in Elasticsearch?

A DELETE /_snapshot/my_backup

B GET /_snapshot/my_backup

C POST /_snapshot/my_backup/_restore

D PUT /_snapshot/my_backup

PUT is used to create or update a snapshot repository.

Which repository type is used for storing snapshots on local disk?

A s3

B gcs

C fs

D azure

'fs' stands for file system, used for local disk storage.

Can you restore a snapshot to a running Elasticsearch cluster?

A Yes, cluster can be running

B No, cluster must be stopped

C Only if cluster is in read-only mode

D Only during off-peak hours

Snapshots can be restored while the cluster is running.

What does a snapshot include?

A Index data and cluster metadata

B Only index data

C Only cluster settings

D Only node configurations

Snapshots include both index data and cluster metadata.

Which API call starts a snapshot creation?

A POST /_snapshot/my_backup/snapshot_1/_create

B PUT /_snapshot/my_backup/snapshot_1

C POST /_snapshot/my_backup/snapshot_1/_restore

D GET /_snapshot/my_backup/snapshot_1

PUT is used to create a snapshot with a given name.

Explain the process of creating and restoring a snapshot in Elasticsearch.

Think about backup and recovery steps.

Why is snapshot and restore important for Elasticsearch clusters?

Consider real-life data safety and availability.