# ether: set up node

###### Sprint: ?


###DOC

we setup our node with geth.Geth(Go Ethereum) is a command line interface for running Ethereum node implemented in Go Language. Using Geth you can join Ethereum network, transfer ether between accounts or even mine ethers.


###steup

You can start Geth in one of three different sync modes using the --syncmode "<mode>" argument that determines what sort of node it is in the network.

These are:

1. Full: Downloads all blocks (including headers, transactions, and receipts) and generates the state of the blockchain incrementally by executing every block.
2. Fast: Downloads all blocks (including headers, transactions and receipts), verifies all headers, and downloads the state and verifies it against the headers.
3. Snap (Default): Same functionality as fast, but with a faster algorithm.
4. Light: Downloads all block headers, block data, and verifies some randomly.

we used light mode to better speed in syncing and decrease needed storage.


Ethereum has many networks:
1. mainnet
2. testnet
    1. Görli(goerli)<br >
       A proof-of-authority testnet that works across clients.
       
    2. Kovan:<br >
       A proof-of-authority testnet for those running OpenEthereum clients.

    3. Rinkeby:<br >
       A proof-of-authority testnet for those running Geth client.
    4. Ropsten:<br >
       A proof-of-work testnet. This means it's the best like-for-like representation of Ethereum.
       

we wrote an script to setup eth node:

```shell
geth --goerli --http --http.vhosts="" --http.addr=0.0.0.0  --datadir /home/ubuntu/.ethereum --rpcaddr=0.0.0.0 --rpcport=8545 --port=30303 --rpcapi="admin,db,debug,personal,eth,net,web3" --rpccorsdomain="" --rpcvhosts="*" --syncmode="light" --cache=2048 --allow-insecure-unlock --nousb
```
* in goerli testnet and light mode

you can see more detail in [geth docs](https://geth.ethereum.org/docs/interface/command-line-options) or use 
```shell
geth --help
```
after installation


###some commands and tips
1. install the geth on your machine<br/>
   commands for ubuntu
   - sudo add-apt-repository -y ppa:ethereum/ethereum
   - sudo apt-get update
   - sudo apt-get install ethereum
2. connect to console of Eth server:
   geth attach `http://ip:prot`
3. personal.newAccount()<br >
   Generates a new private key and stores it in the key store directory. The key file is encrypted with the given passphrase. Returns the address of the new account.<br >
    At the geth console, newAccount will prompt for a passphrase when it is not supplied as the argument.
```shell
> personal.newAccount()
Passphrase: 
Repeat passphrase: 
"0x5e97870f263700f46aa00d967821199b9bc5a120"
```

2. for checking that geth is updated or not you can use:
    ```shell
   > eth
    ``` 
   for all informations
    ```shell
    > eth.blockNumber
    ``` 
   for getting only last received block<br >
and compare it with [etherscan](https://etherscan.io/)
   
3. to connect to your node with js console you can use:
```shell
geth attach {$your_node_anddress}
```