7416b05b81
This PR: - reorganizes all documentation pages so they live in the right category - removes lots of legacy docs - contains many improvements to active documentation pages Geth user documentation is now spread across five major categories: - Install and Build: installation and compile instructions - Using Geth: this is for pages about general geth usage. - For dApp Developers: this is for programming guides and functionality specific to dapp development. All the dev guides for mobile framework and Go APIs live here. - JSON-RPC APIs: this has its own section because there is now a sub-page for every name space. I have also added an overview text that explains how to set up the API servers. - For Geth Developers: this is for geth contributors
49 lines
1.5 KiB
Markdown
49 lines
1.5 KiB
Markdown
---
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title: Dev mode
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sort_key: B
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---
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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.
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Starting geth in dev mode does the following:
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- Initializes the data directory with a testing genesis block
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- Sets max peers to 0
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- Turns off discovery by other nodes
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- Sets the gas price to 0
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- Uses the Clique PoA consensus engine with which allows blocks to be mined as-needed without excessive CPU and memory consumption
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- Uses on-demand block generation, producing blocks when there are transactions waiting to be mined
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You can specify a data directory to maintain state between runs using the `--datadir` option, otherwise databases are ephemeral and in-memory:
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```shell
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$ mkdir test-chain-dir
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$ geth --dev --datadir test-chain-dir console
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```
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Once geth is running in dev mode, you can interact with it in the same way as when geth is running in other ways.
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For example, create a test account:
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```shell
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> personal.newAccount()
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```
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Then transfer ether from the coinbase to the new account:
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```shell
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> eth.sendTransaction({from:eth.coinbase, to:eth.accounts[1], value: web3.toWei(0.05, "ether")})
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```
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And check the balance of the account:
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```shell
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> eth.getBalance(eth.accounts[1])
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```
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If you want to test your dapps with a realistic block time use the `--dev.period` option when you start dev mode:
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```shell
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geth --dev --dev.period 14 console
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```
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