Elasticsearch Snapshots with Azure Part 4: Create Elastic Snapshot Policy
Elasticsearch Snapshot Policy
schedule: What frequency and time to snapshot our data. You can make this as frequent as you require, without worrying too much about storage constraints. Snapshots are incremental, meaning that only the differences between the last snapshot and current snapshot need to be stored. If almost nothing changed between yesterday’s backup and today’s data, then the Elasticsearch snapshot will require negligible storage space, meaning that even if you have gigabytes of data, the snapshot might require just a few megabytes or less.
name: Defines the pattern to use when naming the snapshots
repository: Specifies where to store our snapshots
config.indices: List of the indices to include
retention: Is an optional parameter we can use to define when SLM can delete some of the snapshots. We can specify three options here:
expire_after: This is a time-based expiration. For example, a snapshot created on January 1, with expire_after set to 30 days will be eligible for deletion after January 31.
min_count: Tells Elasticsearch to keep at least this number of snapshots, even if all are expired.
max_count: Tells Elasticsearch to never keep more than this number of snapshots. For example, if we have 100 snapshots and only one is expired, but max_count is set to 50, then 50 of the oldest snapshots will be deleted – even the unexpired ones.
Step 1 - Click on "Snapshot and Restore"
Step 2 - Select "Policies"
Step 3 - Click "Create a policy"
Step 4 - Fill Out Logistics Information
Step 5 - Adding custom "cron" expression
59 59 05 1* ?
Step 6 - Snapshot Settings
For my setup I will just be going with defaults
Step 7 - Snapshot Retention
Snapshots for me will be deleted after 180 days
Step 8 - Review Policy
Step 9 - Run a snapshot to verify the setup works
Step 10 - Snapshots
Click on snapshots to see the snapshot you just made
Step 11 - Snapshot completed
Step 12 - Back in Azure Cloud
You will see the backup of indices in your blob container.