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# Downloader
Service to seed/download historical data (immutable .seg files)
Service to seed/download historical data (snapshots, immutable .seg files) by Bittorrent protocol
## How to Start Erigon in snapshot sync mode
As many other Erigon components (txpool, sentry, rpc daemon) it may be built-into Erigon or run as separated process.
```shell
# 1. Downloader by default run inside Erigon, by `--syncmode=snap` flag:
erigon --syncmode=snap --datadir=<your_datadir>
@ -13,7 +15,7 @@ erigon --syncmode=snap --datadir=<your_datadir>
# 2. It's possible to start Downloader as independent process, by `--syncmode=snap --downloader.api.addr=127.0.0.1:9093` flags:
make erigon downloader
# Start downloader (can limit network usage by 512mb/sec: --download.rate=512mb --upload.rate=512mb)
# Start downloader (can limit network usage by 512mb/sec: --torrent.download.rate=512mb --torrent.upload.rate=512mb)
downloader --downloader.api.addr=127.0.0.1:9093 --torrent.port=42068 --datadir=<your_datadir>
# --downloader.api.addr - is for internal communication with Erigon
# --torrent.port=42068 - is for public BitTorrent protocol listen
@ -49,6 +51,9 @@ downloader torrent_hashes --rebuild --datadir=<your_datadir>
downloader --downloader.api.addr=127.0.0.1:9093 --datadir=<your_datadir>
# Erigon is not required for snapshots seeding
# But Erigon can use snapshots only after indexing them (this step is not required for seeding)
erigon snapshots index --datadir=<your_datadir>
```
## Architecture