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I have created a private ethereum network in my machine, and now I want that other machines join my network.

I think I have to send them the IP of the bootnode, but the question is : what about the genesis block ? ..

to init a node we run "geth --datadir node1/ init genesis.json" so do they need my genesis file ?

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The genesis block is just there to start the blockchain, you don't need it to be manually transported to everyone to be able to connect. from the official geth manual :

Starting Up Your Member Nodes

With the bootnode operational and externally reachable (you can try telnet to ensure it's indeed reachable), start every subsequent Geth node pointed to the bootnode for peer discovery via the --bootnodes flag. It will probably also be desirable to keep the data directory of your private network separated, so do also specify a custom --datadir flag.

geth --datadir path/to/custom/data/folder --networkid 15 --bootnodes <bootnode-enode-url-from-above>

So just connecting to the boot node will spark the synchronization, which is related to the folder you specify in --datadir.

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  • it works just when I copy the some genesis.json and I do "init".. I can't realize why I need the genesis block to be part of an existing network.
    – maroodb
    Commented Aug 9, 2018 at 16:33

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