# Changing openBalena Domain

**URL:** <https://forums.balena.io/t/changing-openbalena-domain/370275>\
**Category:** openBalena\
**Created:** [April 10, 2024, 3:02am UTC](https://forums.balena.io/t/changing-openbalena-domain/370275 "2024-04-10T03:02:28Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![andrea](https://sea2.discourse-cdn.com/balena/user_avatar/forums.balena.io/andrea/32/10162_2.png) [@andrea](https://forums.balena.io/u/andrea)\
**Post date:** [June 10, 2025, 9:39am UTC](https://forums.balena.io/t/changing-openbalena-domain/370275/5 "2025-06-10T09:39:17Z")

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Hi @drcnyc,

Could you help me remember the `config.json` update process?

> The essence of the cutover process is just updating config.json to point to the new API server. There is a service that watches config.json and will apply the change, reconfigure the VPN and restart the supervisor.

If I’m not mistaken, the only way to update the `config.json` (without using `balena join` from the CLI) is by SSHing into the device and running a command I can’t recall ☹ which was something like `update_command "config.json content on a single line"`. For the `config.json`, I’d use the one I injected into the image before flashing the device (which adds keys after provisioning), but I have a doubt about an `apiKey` that’s present in this file but not in the provisioned one, for which I can’t find any documentation.

Is the mirror of the old registry database to avoid having to redeploy the application?

> You’ll also want to make sure the new balena environment had a mirror of the old database, registry etc. Otherwise you will have to manually register the device. If you prefer to start clean, you can automate that in a shell script as well, but you’ll want to make sure that if you get a new UUID or API key that you apply those to config.json in addition to the API server.

I’m also interested in this scenario as I’m currently dealing with this problem: [Build on Internet-Connected Machine and Deploying to Internet-Isolated Environment](https://forums.balena.io/t/build-on-internet-connected-machine-and-deploying-to-internet-isolated-environment/373919) (in which I believe I’ve made some progress), but the device I tried to move with the wizard using the `balena join` CLI isn’t downloading the application. And it seems to me that it’s not properly moved even if it says “operational”, so I wanted to try moving it by injecting the `config.json` from the device.

Thanks

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