Newbie here.

I ran geth --dev and then geth --dev attach on another console and everything is looking fine.

When I run miner.start() I can see on my geth --dev window that there are some blocks being mined...

What does this mean? what blocks am I mining if I'm the only one in the network? when I run geth --dev dont I need to sync a blockchain?(I guess there isn't one since I just created it on the provate network but the first question still persists)

Any pointers/tutorials on geth commands/deeper explanation?

1 Answer 1


According to geth --help, the --dev option puts you in "Developer mode: pre-configured private network with several debugging flags". You are running a private network of your own.

FWIW I spent a few days trying to figure out from the docs how to get started and summarised my own newbie findings here - may help https://alanbuxton.wordpress.com/2017/07/19/first-steps-with-ethereum-private-networks-and-smart-contracts-on-ubuntu-16-04/

  • Nice guide! but still i am looking for the answer as to what exactly/how is that mining being configured. If I were to run geth on testnet and mine then Im guessing I would be mining blocks of people that are on the testnet... but not sure on dev Commented Jul 24, 2017 at 7:38
  • geth --dev is running your own private network. Commented Jul 24, 2017 at 7:53
  • what about geth --rpc? Commented Jul 24, 2017 at 7:57
  • It enables you to connect to the geth node via RPC, e.g. see this wiki page github.com/ethereum/go-ethereum/wiki/JavaScript-Console Specifically the example command: curl -X POST --data '{"jsonrpc":"2.0","method":"miner_start","params":[],"id":74}' localhost:8545 .... What is it you are actually looking to do here? Commented Jul 24, 2017 at 10:43
  • Just wanted to understand more about the whole process. Thanks though! Commented Jul 25, 2017 at 6:07

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