1.5 KiB
1.5 KiB
| title | sort_key |
|---|---|
| Dev mode | B |
Geth has a development mode which sets up a single node Ethereum test network with a number of options optimized for developing on local machines. You enable it with the --dev argument.
Starting geth in dev mode does the following:
- Initializes the data directory with a testing genesis block
- Sets max peers to 0
- Turns off discovery by other nodes
- Sets the gas price to 0
- Uses the Clique PoA consensus engine with which allows blocks to be mined as-needed without excessive CPU and memory consumption
- Uses on-demand block generation, producing blocks when there are transactions waiting to be mined
You can specify a data directory to maintain state between runs using the --datadir option, otherwise databases are ephemeral and in-memory:
$ mkdir test-chain-dir
$ geth --dev --datadir test-chain-dir console
Once geth is running in dev mode, you can interact with it in the same way as when geth is running in other ways.
For example, create a test account:
> personal.newAccount()
Then transfer ether from the coinbase to the new account:
> eth.sendTransaction({from:eth.coinbase, to:eth.accounts[1], value: web3.toWei(0.05, "ether")})
And check the balance of the account:
> eth.getBalance(eth.accounts[1])
If you want to test your dapps with a realistic block time use the --dev.period option when you start dev mode:
geth --dev --dev.period 14 console