Snapshot and restore in Elasticsearch - Step-by-Step Execution

Concept Flow - Snapshot and restore

Create Snapshot Repository

↓

Take Snapshot

↓

Snapshot Stored Safely

↓

Restore Snapshot

↓

Data Restored to Cluster

The flow shows creating a place to save snapshots, taking a snapshot, storing it, and later restoring data from it.

Execution Sample

Elasticsearch

PUT /_snapshot/my_backup
{
  "type": "fs",
  "settings": {"location": "/mount/backups/my_backup"}
}

PUT /_snapshot/my_backup/snapshot_1?wait_for_completion=true

POST /_snapshot/my_backup/snapshot_1/_restore

This code creates a snapshot repository, takes a snapshot, and restores it to the cluster.

Execution Table

Step	Action	Request Sent	Response Status	Result
1	Create snapshot repository	PUT /_snapshot/my_backup with location setting	Acknowledged	Repository 'my_backup' created
2	Take snapshot	PUT /_snapshot/my_backup/snapshot_1?wait_for_completion=true	OK	Snapshot 'snapshot_1' saved in 'my_backup'
3	Restore snapshot	POST /_snapshot/my_backup/snapshot_1/_restore	Accepted	Data restored from 'snapshot_1'
4	End	No further requests	N/A	Snapshot and restore process complete

💡 All steps completed successfully; snapshot stored and restored.

Variable Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	Final
Repository 'my_backup'	Not created	Created	Created	Created	Created
Snapshot 'snapshot_1'	Not taken	Not taken	Taken	Taken	Taken
Cluster Data	Original data	Original data	Original data	Restored from snapshot	Restored data

Key Moments - 3 Insights

Why do we need to create a snapshot repository before taking a snapshot?

The repository is the storage location for snapshots. Without it, Elasticsearch doesn't know where to save the snapshot. See execution_table step 1.

What does the parameter 'wait_for_completion=true' do when taking a snapshot?

It makes the request wait until the snapshot finishes before responding, so you know when it's done. See execution_table step 2.

Does restoring a snapshot delete existing data in the cluster?

No, restoring merges or overwrites data from the snapshot but does not delete the entire cluster data. See execution_table step 3.

Visual Quiz - 3 Questions

Look at the execution_table, what is the response status after creating the snapshot repository?

A Error

B Acknowledged

C Accepted

D Timeout

💡 Hint

Check execution_table row 1, column 'Response Status'

At which step is the snapshot actually saved?

A Step 3

B Step 1

C Step 2

D Step 4

💡 Hint

Look at execution_table row 2, 'Result' column

If you skip creating the repository, what will happen when you try to take a snapshot?

A Snapshot will fail because repository does not exist

B Snapshot will be saved in default location

C Snapshot will be saved but cannot be restored

D Snapshot will be created but empty

💡 Hint

Refer to key_moments question about repository necessity and execution_table step 1

Concept Snapshot

Snapshot and restore in Elasticsearch:
- Create a snapshot repository (storage location)
- Take a snapshot to save cluster data
- Restore snapshot to recover data
- Use REST API calls: PUT for repo and snapshot, POST for restore
- 'wait_for_completion=true' waits for snapshot to finish

Full Transcript

This visual execution shows how Elasticsearch snapshot and restore works step-by-step. First, you create a snapshot repository, which is a place to store backups. Then you take a snapshot, which saves the current data state into that repository. Finally, you restore the snapshot to recover data. The execution table tracks each step's request, response, and result. Variables like repository status, snapshot status, and cluster data change as the process runs. Key moments clarify why the repository is needed, what 'wait_for_completion' means, and how restore affects data. The quiz tests understanding of these steps and their outcomes.