Red_con_un_solo_nodo.md

+# Instalación de una red con un solo nodo
+Es posible instalar una red con un solo nodo, a los efectos de testeo o desarrollo.
+
+Se asume que ya está instalado `geth`, pero por ejemplo en Ubuntu se puede instalar con:
+
+```
+sudo add-apt-repository -y ppa:ethereum/ethereum
+sudo apt-get update
+sudo apt-get install ethereum
+```
+ 
+```
+$ geth version
+Geth
+Version: 1.8.14-stable
+Git Commit: 316fc7ecfc10d06603f1358c1f4c1020ec36dd2a
+Architecture: amd64
+Protocol Versions: [63 62]
+Network Id: 1
+Go Version: go1.10.1
+Operating System: linux
+GOPATH=
+GOROOT=/usr/lib/go-1.10
+```
+
+## Creación de directorios
+
+A modo de ejemplo, crearemos un directorio `devnet`, dentro del cual existirá un subdirectorio `network`, que albergará un directorio por nodo (en este caso uno solo, llamado `node`).
+```
+$ mkdir -p devnet/network/node
+```
+## Creación de cuentas
+Debe crearse al menos una cuenta.
+
+```
+$ cd devnet
+devnet$ geth --datadir network/node account new
+INFO [10-11|11:36:05.231] Maximum peer count                       ETH=25 LES=0 total=25
+Your new account is locked with a password. Please give a password. Do not forget this password.
+Passphrase: 
+Repeat passphrase: 
+Address: {10c69b29d6f1bedc6fb97758f74a9f64eb2e7694}
+```
+
+En este caso la dirección de la cuenta es `0x10c69b29d6f1bedc6fb97758f74a9f64eb2e7694`. La dirección también puede obtenerse de la última parte del nombre del archivo correspondiente en el directorio `node/keystore/`
+
+```
+~/devnet$ ls network/node/keystore/
+UTC--2018-10-11T14-36-07.790871325Z--10c69b29d6f1bedc6fb97758f74a9f64eb2e7694
+```
+La _passphrase_ solicitada se puede dejar vacía.
+
+En los ejemplos de los pasos siguientes, debe reemplazarse la dirección `0x10c69b29d6f1bedc6fb97758f74a9f64eb2e7694` por la que se haya generado en el nodo a crear.
+
+## Creación del bloque génesis e inicialización de la red
+
+Usaremos el programa `puppeth`, parte de `geth`:
+
+```
+devnet$ puppeth
++-----------------------------------------------------------+
+| Welcome to puppeth, your Ethereum private network manager |
+|                                                           |
+| This tool lets you create a new Ethereum network down to  |
+| the genesis block, bootnodes, miners and ethstats servers |
+| without the hassle that it would normally entail.         |
+|                                                           |
+| Puppeth uses SSH to dial in to remote servers, and builds |
+| its network components out of Docker containers using the |
+| docker-compose toolset.                                   |
++-----------------------------------------------------------+
+
+Please specify a network name to administer (no spaces or hyphens, please)
+> devnet
+
+Sweet, you can set this via --network=devnet next time!
+
+INFO [10-11|11:40:40.128] Administering Ethereum network           name=devnet
+WARN [10-11|11:40:40.129] No previous configurations found         path=/home/miguel/.puppeth/devnet
+
+What would you like to do? (default = stats)
+ 1. Show network stats
+ 2. Configure new genesis
+ 3. Track new remote server
+ 4. Deploy network components
+> 2
+
+Which consensus engine to use? (default = clique)
+ 1. Ethash - proof-of-work
+ 2. Clique - proof-of-authority
+> 2
+
+How many seconds should blocks take? (default = 15)
+> 
+
+Which accounts are allowed to seal? (mandatory at least one)
+> 0x10c69b29d6f1bedc6fb97758f74a9f64eb2e7694
+> 0x
+
+Which accounts should be pre-funded? (advisable at least one)
+> 0x10c69b29d6f1bedc6fb97758f74a9f64eb2e7694
+> 0x
+
+Specify your chain/network ID if you want an explicit one (default = random)
+> 12345
+INFO [10-11|11:41:26.635] Configured new genesis block 
+
+What would you like to do? (default = stats)
+ 1. Show network stats
+ 2. Manage existing genesis
+ 3. Track new remote server
+ 4. Deploy network components
+> 2
+
+ 1. Modify existing fork rules
+ 2. Export genesis configuration
+ 3. Remove genesis configuration
+> 2
+
+Which file to save the genesis into? (default = devnet.json)
+> genesis.json
+INFO [10-11|11:41:41.689] Exported existing genesis block 
+
+What would you like to do? (default = stats)
+ 1. Show network stats
+ 2. Manage existing genesis
+ 3. Track new remote server
+ 4. Deploy network components
+> ^C
+```
+
+Finalizado este paso, el archivo `genesis.json` (si se eligió ese nombre), tiene la información necesaria para inicializar la red:
+
+```
+devnet$ geth --datadir network/node init genesis.json
+```
+
+## Lanzar el nodo
+
+```
+devnet$ geth --datadir network/node/ --syncmode 'full' --port 30303 --rpc --rpcaddr 'localhost' --rpcport 8545 --rpcapi 'personal,db,eth,net,web3,txpool,miner' --networkid 12345 --gasprice '1' --unlock '0x10c69b29d6f1bedc6fb97758f74a9f64eb2e7694' --password /dev/null --mine
+```
+
+## Conexión al nodo
+
+### Mediante IPC
+```
+$ geth attach network/node/geth.ipc 
+Welcome to the Geth JavaScript console!
+
+instance: Geth/v1.8.14-stable-316fc7ec/linux-amd64/go1.10.1
+coinbase: 0xdf11900897ac4a842c1691dfd466b84adc7aa3d0
+at block: 441 (Thu, 11 Oct 2018 12:06:52 -03)
+ datadir: /home/miguel/devnet/network/node
+ modules: admin:1.0 clique:1.0 debug:1.0 eth:1.0 miner:1.0 net:1.0 personal:1.0 rpc:1.0 txpool:1.0 web3:1.0
+
+> 
+```
+
+### Mediante RPC
+```
+devnet$ geth attach http://localhost:8545
+Welcome to the Geth JavaScript console!
+
+instance: Geth/v1.8.14-stable-316fc7ec/linux-amd64/go1.10.1
+coinbase: 0xdf11900897ac4a842c1691dfd466b84adc7aa3d0
+at block: 448 (Thu, 11 Oct 2018 12:08:37 -03)
+ modules: eth:1.0 miner:1.0 net:1.0 personal:1.0 rpc:1.0 txpool:1.0 web3:1.0
+
+> 
+```
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