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Command Line Options

bas-vk edited this page Jul 7, 2015 · 45 revisions

CLI client

Command line client options are a moving target under constant change now. Please refer to the client to geth help. Below is the output of geth help (version 0.9.35 2015-07-07).

geth [global options] command [command options] [arguments...]

VERSION:
   0.9.35

COMMANDS:
   recover	attempts to recover a corrupted database by setting a new block by number or hash. See help recover.
   blocktest	loads a block test file
   import	import a blockchain file
   export	export blockchain into file
   upgradedb	upgrade chainblock database
   removedb	Remove blockchain and state databases
   dump		dump a specific block from storage
   monitor	Geth Monitor: node metrics monitoring and visualization
   makedag	generate ethash dag (for testing)
   version	print ethereum version numbers
   wallet	ethereum presale wallet
   account	manage accounts
   console	Geth Console: interactive JavaScript environment
   attach	Geth Console: interactive JavaScript environment (connect to node)
   js		executes the given JavaScript files in the Geth JavaScript VM
   help		Shows a list of commands or help for one command
   
GLOBAL OPTIONS:
   --identity 								Custom node name
   --unlock 								Unlock the account given until this program exits (prompts for password). '--unlock n' unlocks the n-th account in order or creation.
   --password 								Path to password file to use with options and subcommands needing a password
   --genesisnonce "42"							Sets the genesis nonce
   --bootnodes 								Space-separated enode URLs for p2p discovery bootstrap
   --datadir "/Users/bas/Library/Ethereum"				Data directory to be used
   --blockchainversion "3"						Blockchain version (integer)
   --jspath "."								JS library path to be used with console and js subcommands
   --port "30303"							Network listening port
   --maxpeers "25"							Maximum number of network peers (network disabled if set to 0)
   --maxpendpeers "0"							Maximum number of pending connection attempts (defaults used if set to 0)
   --etherbase "primary"						Public address for block mining rewards. By default the address of your primary account is used
   --gasprice "1000000000000"						Sets the minimal gasprice when mining transactions
   --minerthreads "8"							Number of miner threads
   --mine								Enable mining
   --autodag								Enable automatic DAG pregeneration
   --nat "any"								NAT port mapping mechanism (any|none|upnp|pmp|extip:<IP>)
   --natspec								Enable NatSpec confirmation notice
   --nodiscover								Disables the peer discovery mechanism (manual peer addition)
   --nodekey 								P2P node key file
   --nodekeyhex 							P2P node key as hex (for testing)
   --rpc								Enable the JSON-RPC server
   --rpcaddr "127.0.0.1"						Listening address for the JSON-RPC server
   --rpcport "8545"							Port on which the JSON-RPC server should listen
   --rpcapi "db,eth,net,web3"						Specify the API's which are offered over the HTTP RPC interface
   --ipcdisable								Disable the IPC-RPC server
   --ipcapi "admin,db,eth,debug,miner,net,shh,txpool,personal,web3"	Specify the API's which are offered over the IPC interface
   --ipcpath "/Users/bas/Library/Ethereum/geth.ipc"			Filename for IPC socket/pipe
   --exec 								Execute javascript statement (only in combination with console/attach)
   --shh								Enable whisper
   --vmdebug								Virtual Machine debug output
   --networkid "0"							Network Id (integer)
   --rpccorsdomain 							Domain on which to send Access-Control-Allow-Origin header
   --verbosity "3"							Logging verbosity: 0-6 (0=silent, 1=error, 2=warn, 3=info, 4=core, 5=debug, 6=debug detail)
   --backtrace_at ":0"							If set to a file and line number (e.g., "block.go:271") holding a logging statement, a stack trace will be logged
   --logtostderr							Logs are written to standard error instead of to files.
   --vmodule ""								The syntax of the argument is a comma-separated list of pattern=N, where pattern is a literal file name (minus the ".go" suffix) or "glob" pattern and N is a log verbosity level.
   --logfile 								Send log output to a file
   --logjson 								Send json structured log output to a file or '-' for standard output (default: no json output)
   --pprof								Enable the profiling server on localhost
   --pprofport "6060"							Port on which the profiler should listen
   --metrics								Enables metrics collection and reporting
   --solc "solc"							solidity compiler to be used
   --gpomin "1000000000000"						Minimum suggested gas price
   --gpomax "100000000000000"						Maximum suggested gas price
   --gpofull "80"							Full block threshold for gas price calculation (%)
   --gpobasedown "10"							Suggested gas price base step down ratio (1/1000)
   --gpobaseup "100"							Suggested gas price base step up ratio (1/1000)
   --gpobasecf "110"							Suggested gas price base correction factor (%)
   --help, -h								show help


Note that the default for datadir is platform-specific. See backup & restore for more information.

Examples

Accounts

See Account management

Import ether presale wallet into your node (prompts for password):

geth wallet import /path/to/my/etherwallet.json

Import an EC privatekey into an ethereum account (prompts for password):

geth account import /path/to/key.prv

Geth JavaScript Runtime Environment

See Geth javascript console

Bring up the geth javascript console:

geth --verbosity 5 --logtostderr --jspath /mydapp/js console 2>> /path/to/logfile

Execute test.js javascript using js API and log Debug-level messages to /path/to/logfile:

geth --logtostderr --verbosity 6 js test.js  2>> /path/to/logfile

Import/export chains and dump blocks

Import a blockchain from file:

geth import blockchain.bin

Upgrade chainblock database

When the consensus algorithm is changed blocks in the blockchain must be reimported with the new algorithm. Geth will inform the user with instructions when and how to do this when it's necessary.

geth upgradedb

Mining and networking

Start two mining nodes using different data directories listening on ports 30303 and 30304, respectively:

geth --mine --minerthreads 4 --datadir /usr/local/share/ethereum/30303 --port 30303
geth --mine --minerthreads 4 --datadir /usr/local/share/ethereum/30304 --port 30304

Start an rpc client on port 8000:

geth --rpc true --rpcport 8000 --rpccorsdomain '"*"'

Start a client with a private network id and connect to specific peers using enode urls:

geth --networkid 3301 -bootnodes="enode://6f8a80d14311c39f35f516fa664deaaaa13e85b2f7493f37f6144d86991ec012937307647bd3b9a82abe2974e1407241d54947bbb39763a4cac9f77166ad92a0@54.169.166.226:30303 enode://0b2fa1e93dfcd90ce503ab1338332d6a1371b464838b49f37af8534a510992bd4d96b24134ba262ad9298ab4aa6f132132f84c3b6d10ebaead5f9a236be286f10@54.169.166.218:30305" -maxpeers 2

Launch the client without network:

geth --maxpeers 0 js justwannarunthis.js

Resetting the blockchain

In the datadir, delete the blockchain directory. For an example above:

rm -rf /usr/local/share/ethereum/30303/blockchain

Sample usage in testing environment

The lines below are meant only for test network and safe environments for non-interactive scripted use.

geth --datadir /tmp/eth/42 --password <(echo -n notsosecret) account new 2>> /tmp/eth/42.log
geth --datadir /tmp/eth/42 --port 30342  js <(echo 'console.log(admin.nodeInfo().NodeUrl)') > enode 2>> /tmp/eth/42.log
geth --datadir /tmp/eth/42 --port 30342 --password <(echo -n notsosecret) --unlock primary --minerthreads 4 --mine 2>> /tmp/eth/42.log

Attach

Attach a console to a running geth instance. By default this happens over IPC over the default IPC endpoint but when necessary a custom endpoint could be specified:

geth attach ipc:/some/path
geth attach rpc:http://host:8545

Alternative ways to set flags

WARNING: This is not available for the latest frontier poc9.

The same flags can be set via config file (by default <datadir>/conf.ini) as well as environment variables.

Precedence: default < config file < environment variables < command line

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