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[DOCS] Update dev mode tutorial (#20826) 

* Update dev mode tutorial to include connecting to Remix

* Remove mention of ports

* Update Remix steps
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Chris Chinchilla 2020-05-12 10:45:14 +02:00 committed by GitHub
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docs/_getting-started/dev-mode.md
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@ -3,7 +3,7 @@ title: Dev mode
sort_key: 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.
Geth has a development mode that sets up a single node Ethereum test network with options optimized for developing on local machines. You enable it with the `--dev` argument.
Starting geth in dev mode does the following:
@ -12,13 +12,26 @@ Starting geth in dev mode does the following:
- 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
- Uses on-demand block generation, producing blocks when transactions are 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:
## Start Geth in Dev Mode
You can specify a data directory to maintain state between runs using the `--datadir` option, otherwise, databases are ephemeral and in-memory:
```shell
$ mkdir test-chain-dir
$ geth --dev --datadir test-chain-dir console
mkdir test-chain-dir
```
For this guide, start geth in dev mode, and enable [RPC](../_rpc/server.md) so you can connect other applications to geth. For this guide, we use Remix, the web-based Ethereum IDE, so also allow its domains to accept cross-origin requests.
```shell
geth --datadir test-chain-dir --rpc --dev --rpccorsdomain "https://remix.ethereum.org,http://remix.ethereum.org"
```
Connect to the IPC console on the node from another terminal window:
```shell
geth attach <IPC_LOCATION>
```
Once geth is running in dev mode, you can interact with it in the same way as when geth is running in other ways.
@ -29,7 +42,7 @@ For example, create a test account:
> personal.newAccount()
```
Then transfer ether from the coinbase to the new account:
And transfer ether from the coinbase to the new account:
```shell
> eth.sendTransaction({from:eth.coinbase, to:eth.accounts[1], value: web3.toWei(0.05, "ether")})
@ -41,8 +54,8 @@ 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:
If you want to test your dapps with a realistic block time use the `--dev.period` option when you start dev mode with the `--dev.period 14` argument.
```shell
geth --dev --dev.period 14 console
```
## Connect Remix to Geth
With geth now running, open <https://remix.ethereum.org>. Compile the contract as normal, but when you deploy and run a contract, select _Web3 Provider_ from the _Environment_ dropdown, and add "http://127.0.0.1:8545" to the popup box. Click _Deploy_, and interact with the contract. You should see contract creation, mining, and transaction activity.