Docker

Image: lavrushin/b4 on Docker Hub.

docker-compose

Create a docker-compose.yml file:

services:
  b4:
    image: lavrushin/b4:latest
    container_name: b4
    network_mode: host
    cap_add:
      - NET_ADMIN
      - NET_RAW
      - SYS_MODULE
    volumes:
      - ./config:/etc/b4
    restart: unless-stopped

Run:

mkdir -p config
docker compose up -d

docker run

mkdir -p config
docker run -d \
  --name b4 \
  --network host \
  --cap-add NET_ADMIN \
  --cap-add NET_RAW \
  --cap-add SYS_MODULE \
  -v ./config:/etc/b4 \
  --restart unless-stopped \
  lavrushin/b4:latest

Parameters

Parameter	Purpose
network_mode: host	b4 works with the host network stack directly
NET_ADMIN	manage netfilter and firewall rules
NET_RAW	use raw sockets
SYS_MODULE	load kernel modules (modprobe)
-v ./config:/etc/b4	configuration is stored on the host

Management

docker compose logs -f b4     # logs
docker compose restart b4     # restart
docker compose down            # stop
docker compose pull && docker compose up -d   # update

Web interface

After startup: http://localhost:7000

The port is configured in config/b4.json (web_server.port).