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I'm researching setting up a highly available baking infrastructure.
Is it possible to use multiple ledgers signing for the same address?
My plan is to use a ledger connected to a laptop running a tezos-signer daemon and have two bakers (one active, one hot-standby) use this signer. I would prefer to duplicate the signer too - if possible. I would like to use a ledger to get it's double bake protection, but I guess that goes out the window if I use multiple ledgers 🤔
It is possible to have a hot-standby signer albeit I would recommend against it.
In order to have a hot-standby, you initialise a second ledger with the same seed as the first one. Then you need a strategy that describes in what cases the standby signer becomes active.
The downside of a standby signer is that you lose the double-sign protection that the ledger offers, since you cannot port the state to the 2nd ledger when the 1st fails.
In Tezos safety faults are punished much more severely than liveness faults and due to this I would always recommend against having a hot-standby. When your first signer goes down, you should investigate why and manually determine the next steps.
The main risk with using multiple ledger/bakers is the risk of double-baking/double-endorsing which will make you lose your bond.
So technically the answer to your question is "yes" however to be proper it relies on your setup's ability to make sure that at any one time at most one baking node is able to talk to the network. There are various ways to accomplish this.
