Add Erigon

docs/using-ethereum/ethereum-clients/erigon.md

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+---
+title: Erigon - EthHub
+
+description: Erigon - Ethereum implementation on the efficiency frontier
+---
+
+# Erigon
+
+## Summary
+
+Erigon is a completely re-architected implementation of Ethereum. Currently written in Golang, with other implementations to follow.
+
+Erigon's biggest selling points are:
+* Full Database / Data Model redesign
+ * Full Archive Node in 1.2TB (as of 2021-06-01)
+* Staged Sync
+ * Full Archive Node in less than 3 Days on NVMe (as of 2021-06-01)
+* More Modular Design
+ * Core/Execution
+ * Peering (sentry) (coming soon)
+ * JSON-RPC Server (rpcdaemon)
+* Selective Pruning with Storage-Mode:
+```
+--storage-mode value
+ * h - write history to the DB
+ * r - write receipts to the DB
+ * t - write tx lookup index to the DB
+ * c - write call traces index to the DB,
+ * e - write TEVM translated code to the DB
+```
+
+## Requirements
+
+Minimum:
+
+* CPU with 2+ cores
+* 16GB RAM
+* Storage:
+ * Full Prune (`--storage-mode=`): ~450GB
+ * Full Archive (default or `--storage-mode=hrtc`): ~1.2TB
+
+## Setup
+
+* [Download and install Golang](https://golang.org/doc/install)
+* Clone the [stable repository](https://github.com/ledgerwatch/erigon/tree/stable)
+ * `git clone --branch stable https://github.com/ledgerwatch/erigon.git`
+* Build erigon from source
+
+### Linux
+```bash
+cd erigon
+make
+```
+### Windows
+* Install [Chocolatey](https://chocolatey.org/)
+* build via Powershell:
+```powershell
+choco install cmake make mingw
+cd erigon
+./win-build.ps1
+```
+
+Binaries should be available in the build/bin folder once build is complete if successful.
+
+## Running
+
+At this time, Erigon only has one mode of operation and that is "Full Sync"
+
+There are 2 primary components to be concerned with at this time.
+1. erigon
+ * This is the core component that is responsible for downloading blocks and processing them
+ * Eventually the peering will be removed into a separate process (sentry) but for now it's all in `erigon`
+2. rpcdaemon
+ * This is the JSON-RPC Server that lets you query the node for data
+
+## Using
+
+Both `erigon` and `rpcdaemon` should be located in the `build/bin` folder after building. You can copy or move them to a new location if desired.
+
+Running erigon can be as simple as:
+```bash
+./build/bin/erigon
+```
+
+Running rpcdaemon can be as simple as:
+```bash
+./build/bin/rpcdaemon
+```
+
+However, both erigon and rpcdaemon have many of the same flags that you might find with `geth` and you can get help with those flags via `--help`
+
+A more complex example:
+```bash
+# erigon in full pruning mode, custom datadir, custom peer identity, custom port number, and listening on all interfaces
+./build/bin/erigon --storage-mode= --datadir="/data/erigon/datadir" --identity="my-erigon-node" --port=30304 --private.api.addr="0.0.0.0:9090"
+
+# rpcdaemon running in dual-mode, listening on all interfaces, on port 8544, disabling CORS, enabling all HTTP APIs, enabling WebSockets
+./build/bin/rpcdaemon --datadir="/data/erigon/datadir" --private.api.addr="localhost:9090" --http.addr="0.0.0.0" --http.port=8544 --http.vhosts="*" --http.corsdomain="*" --http.api="eth,debug,net,trace,web3,erigon" --ws
+```
+
+## Resources
+* [Github](https://github.com/ledgerwatch/erigon)