compose.yml

---
x-host: &host
  command: ["sleep", "infinity"]
  cap_add:
    - NET_ADMIN
  networks:
    - underlay

services:
  host-i:
    <<: *host
    image: debian:13.7-slim
    privileged: true # the hub sets net.ipv4.ip_forward; /proc/sys is read-only unprivileged
    container_name: "${HOST_I:?set by test.sh}"
    hostname: "${HOST_I:?set by test.sh}"

  host-ii:
    <<: *host
    image: debian:13.7-slim
    container_name: "${HOST_II:?set by test.sh}"
    hostname: "${HOST_II:?set by test.sh}"

  host-iii:
    <<: *host
    image: debian:13.7-slim
    container_name: "${HOST_III:?set by test.sh}"
    hostname: "${HOST_III:?set by test.sh}"

networks:
  underlay:
    name: "${NETWORK:?set by test.sh}"