Ethereum network hub
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If you'd like to contribute to go-ethereum, please fork, fix, commit and send a pull request for the maintainers to review and merge into the main code base. Please see the Developers' Guide for more details on configuring your environment, managing project dependencies and testing procedures.
The go-ethereum library i. The go-ethereum binaries i. Official golang implementation of the Ethereum protocol. Go Ethereum Official golang implementation of the Ethereum protocol. Building the source For prerequisites and detailed build instructions please read the Installation Instructions on the wiki.
Once the dependencies are installed, run make geth or, to build the full suite of utilities: It is the entry point into the Ethereum network main-, test- or private net , capable of running as a full node default archive node retaining all historical state or a light node retrieving data live.
It operates on plain Ethereum contract ABIs with expanded functionality if the contract bytecode is also available. However it also accepts Solidity source files, making development much more streamlined. Please see our Native DApps wiki page for details. It can be used as a lightweight bootstrap node to aid in finding peers in private networks.
Its purpose is to allow isolated, fine-grained debugging of EVM opcodes e. Please see the test suite's readme for details. This is the entrypoint for the swarm network. Running geth Going through all the possible command line flags is out of scope here please consult our CLI Wiki page , but we've enumerated a few common parameter combos to get you up to speed quickly on how you can run your own Geth instance.
Full node on the main Ethereum network By far the most common scenario is people wanting to simply interact with the Ethereum network: Start geth in fast sync mode default, can be changed with the --syncmode flag , causing it to download more data in exchange for avoiding processing the entire history of the Ethereum network, which is very CPU intensive. Start up Geth's built-in interactive JavaScript console , via the trailing console subcommand through which you can invoke all official web3 methods as well as Geth's own management APIs.
This too is optional and if you leave it out you can always attach to an already running Geth instance with geth attach. Full node on the Ethereum test network Transitioning towards developers, if you'd like to play around with creating Ethereum contracts, you almost certainly would like to do that without any real money involved until you get the hang of the entire system. Specifying the --testnet flag however will reconfigure your Geth instance a bit: Note, on OSX and Linux this also means that attaching to a running testnet node requires the use of a custom endpoint since geth attach will try to attach to a production node endpoint by default.
Windows users are not affected by this. Instead of connecting the main Ethereum network, the client will connect to the test network, which uses different P2P bootnodes, different network IDs and genesis states. Full node on the Rinkeby test network The above test network is a cross client one based on the ethash proof-of-work consensus algorithm.
This works only with geth v1. Docker quick start One of the quickest ways to get Ethereum up and running on your machine is by using Docker: Programatically interfacing Geth nodes As a developer, sooner rather than later you'll want to start interacting with Geth and the Ethereum network via your own programs and not manually through the console.
Operating a private network Maintaining your own private network is more involved as a lot of configurations taken for granted in the official networks need to be manually set up. Defining the private genesis state First, you'll need to create the genesis state of your networks, which all nodes need to be aware of and agree upon. If you'd like to pre-fund some accounts for easier testing, you can populate the alloc field with account configs: The clean way is to configure and run a dedicated bootnode: To start a Geth instance for mining, run it with all your usual flags, extended by: Contribution Thank you for considering to help out with the source code!
Please make sure your contributions adhere to our coding guidelines: Code must adhere to the official Go formatting guidelines i. Code must be documented adhering to the official Go commentary guidelines. Pull requests need to be based on and opened against the master branch. Commit messages should be prefixed with the package s they modify. License The go-ethereum library i. Our main Ethereum CLI client. Source code generator to convert Ethereum contract definitions into easy to use, compile-time type-safe Go packages.
Stripped down version of our Ethereum client implementation that only takes part in the network node discovery protocol, but does not run any of the higher level application protocols. As a multiport repeater it works by repeating bits symbols received from one of its ports to all other ports. It is aware of physical layer packets, that is it can detect their start preamble , an idle line interpacket gap and sense a collision which it also propagates by sending a jam signal.
A hub cannot further examine or manage any of the traffic that comes through it: Due to this, hubs can only run in half duplex mode. Consequently, due to a larger collision domain , packet collisions are more frequent in networks connected using hubs than in networks connected using more sophisticated devices. The need for hosts to be able to detect collisions limits the number of hubs and the total size of a network built using hubs a network built using switches does not have these limitations.
Some hubs have manufacturer specific stack ports allowing them to be combined in a way that allows more hubs than simple chaining through Ethernet cables, but even so, a large Fast Ethernet network is likely to require switches to avoid the chaining limits of hubs. Most hubs detect typical problems, such as excessive collisions and jabbering on individual ports, and partition the port, disconnecting it from the shared medium.
Thus, hub-based twisted-pair Ethernet is generally more robust than coaxial cable-based Ethernet e. To pass data through the repeater in a usable fashion from one segment to the next, the framing and data rate must be the same on each segment.
This means that a repeater cannot connect an In the early days of Fast Ethernet, Ethernet switches were relatively expensive devices. Therefore, a compromise between a hub and a switch was developed, known as a dual-speed hub. This obviated the need for an all-or-nothing migration to Fast Ethernet networks.
These devices are considered hubs because the traffic between devices connected at the same speed is not switched.