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From the manual install section, there's a note about initializing the cluster, along with a reference to:

https://discovery.flynn.io/clusters/53e8402e-030f-4861-95ba-...

Does this mean one has to jump through hoops to install flynn on a set of devices that are networked to each other, but cut off from the Internet?

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You can specify the host IPs explicitly instead of using the discovery service. The current snag for isolated clusters is that stock buildpacks require internet access to download languages and frameworks. We'll solve this, but some additional work is necessary.

Am I correct to assume this will break the discovery service if we override with host IPs?

The discovery URL is only used for bootstrapping, nothing will break if you specify IPs instead. They are interchangeable.

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