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Prerequisites:
1

Add Sync

Navigate to Project > Integrations and select the Secret Syncs tab. Click on the Add Sync button.Secret Syncs Tab
2

Select 'Fly.io'

Select Fly.io
3

Configure source

Configure the Source from where secrets should be retrieved, then click Next.Configure Source
  • Environment: The project environment to retrieve secrets from.
  • Secret Path: The folder path to retrieve secrets from.
If you need to sync secrets from multiple folder locations, check out secret imports.
4

Configure destination

Configure the Destination to where secrets should be deployed, then click Next.Configure Destination
  • Fly.io Connection: The Fly.io Connection to authenticate with.
  • App: The Fly.io app to sync secrets to.
5

Configure sync options

Configure the Sync Options to specify how secrets should be synced, then click Next.Configure Sync Options
  • Initial Sync Behavior: Determines how Infisical should resolve the initial sync.
    • Overwrite Destination Secrets: Removes any secrets at the destination endpoint not present in Infisical.
    Fly.io does not support importing secrets.
  • Key Schema: Template that determines how secret names are transformed when syncing, using {{secretKey}} as a placeholder for the original secret name and {{environment}} for the environment.
We highly recommend using a Key Schema to ensure that Infisical only manages the specific keys you intend, keeping everything else untouched.
  • Auto-Sync Enabled: If enabled, secrets will automatically be synced from the source location when changes occur. Disable to enforce manual syncing only.
  • Auto Redeploy On Secret Change: If enabled, Infisical will restart all app machines after syncing or removing secrets so they pick up the new values immediately.
Fly.io does not expose a way to mark secrets as “deployed”. When using auto redeploy, the Fly.io dashboard may show secrets as Staged even though they are already applied to running machines (we force machine restarts to load the new secrets). To confirm deployment, check that your machines restarted after the sync (e.g. in the Fly.io Machines view or app logs).
  • Disable Secret Deletion: If enabled, Infisical will not remove secrets from the sync destination. Enable this option if you intend to manage some secrets manually outside of Infisical.
6

Configure details

Configure the Details of your Fly.io Sync, then click Next.Configure Details
  • Name: The name of your sync. Must be slug-friendly.
  • Description: An optional description for your sync.
7

Review configuration

Review your Fly.io Sync configuration, then click Create Sync.Review Configuration
8

Sync created

If enabled, your Fly.io Sync will begin syncing your secrets to the destination endpoint.Sync Created