Source: https://eugeneplexus.com/guides/add-a-warm-standby

[Guides](https://eugeneplexus.com/guides) · v0.2.1

# Add a warm standby

Keep a second machine ready to take over as the control root.

A warm standby is a second machine that keeps following the control root’s state, so the install’s records survive if the root’s machine is lost.

1.  Pick a machine that has already joined your install.
2.  Open **Machines** and find **Standby**.
3.  Under **Machine**, choose it, press **Make it the standby**, then **Yes, make it the standby**.

The standby’s row shows whether it is up to date. To undo, press **Stop being the standby**, then **Yes, stop it**.

**Known limits**

-   Taking over is done on the standby with your passphrase; it is not a button in the console yet.
-   After a switch, only the machine that took over reaches the new root.

Something different on your screen? [Tell us on GitHub](https://github.com/eugene-plexus/specs/issues/new?title=Guide%3A%20Add%20a%20warm%20standby), with your version and what you saw.

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