Limit number of outgoing connections

[To-Azamat]

Is your feature request related to a problem? Please describe

When active and crawling BM opened thousands of outgoing UDP connections triggering ISP limit and making internet access for other clients unreachable.

Describe the solution you'd like

Add a setting to limit a number of active outgoing connections.

[denniskrol]

#299

[felipemarinho97]

This may be a good solution

[demogorgonz]

Any other options instead of reducing dht_crawler.scaling_factor ?

I tried setting it to 5 and after some time got same results as #299 (comment) :

the number of connections went up again in about 2 hours

Just tried setting the value to 1 and will see how it goes.

Saw that VPN might be possible fix but that doesn't seem like great solution..

[demogorgonz]

Ok this seems to work in docker compose:

services:
  bitmagnet:
    image: ghcr.io/bitmagnet-io/bitmagnet:latest
    ulimits:
      nofile:
        soft: 1024
        hard: 2048
    container_name: bitmagnet
    ports:
      # API and WebUI port:
      - "3333:3333"
      # BitTorrent ports:
      - "3334:3334/tcp"
      - "3334:3334/udp"
    restart: unless-stopped
    environment:
      - POSTGRES_HOST=postgres
      - POSTGRES_PASSWORD=XXXXXXXXXXX
      - DHT_CRAWLER_SCALING_FACTOR=2
...

By setting low ulimits my router is not bombarded with UDP connections, this part exactly:

    ulimits:
      nofile:
        soft: 1024
        hard: 2048

Also reduced DHT_CRAWLER_SCALING_FACTOR to 2, will monitor how it behave.

[To-Azamat]

ulimits:
  nofile:
    soft: 1024
    hard: 2048

Are those documented somewhere?

[demogorgonz]

ulimits:
  nofile:
    soft: 1024
    hard: 2048

Are those documented somewhere?

Documented where? BitMagnet, Docker, or Linux ? For Docker and Linux use google/search for general info.
Feel free to play with values too, this is just a way to limit number of connections in container until this get fixed in BitMagnet/DHT_Crawler.

[DerBunteBall]

See

man ulimit

on your system for technical documentation about the Linux basics.

Compose Reference for docker-compose specific stuff. It's a service level element. Just search for ulimits here.

[To-Azamat]

ulimits:
  nofile:
    soft: 1024
    hard: 2048

It works, partly. I set those to 512-1024 and also a rule at router firewall to drop any outgoing UDP connections from bitmagnet exceeding 1024. Got 170k dropped connections in 9 hours. Still better than before, but hardly a solution.

[demogorgonz]

ulimits:
  nofile:
    soft: 1024
    hard: 2048

It works, partly. I set those to 512-1024 and also a rule at router firewall to drop any outgoing UDP connections from bitmagnet exceeding 1024. Got 170k dropped connections in 9 hours. Still better than before, but hardly a solution.

I have ended up with following values:

    ulimits:
      nofile:
        soft: 512
        hard: 768

My network seems stable, no more disconnects and other issues.

Edit:
Agreed it is not a proper solution, we need config/parameter to limit number of connections in BitMagnet.