docker-compose.yml

# Copyright 2026 Katteli Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# The smallest project that proves a disk is a compose environment: two
# services that reach each other by NAME over the network dockerd gives the
# project. If this runs, veth, netfilter and the platform's iptables are all
# working, which is what a single-container disk cannot tell you.
services:
  server:
    image: busybox:1.36
    command:
      - sh
      - -c
      - "mkdir -p /srv && echo COMPOSE-NET-OK > /srv/proof.txt && httpd -f -v -p 8080 -h /srv"

  # Fetches the server's file by service name, prints it, and exits -- which
  # ends the project, because the machine runs compose with
  # --abort-on-container-exit.
  # It retries because nothing gates it on the server being up; a project
  # whose server takes real time to start should use a healthcheck and
  # `depends_on: condition: service_healthy` instead.
  client:
    image: busybox:1.36
    depends_on: [server]
    command:
      - sh
      - -c
      - "for i in 1 2 3 4 5 6 7 8 9 10; do wget -q -O /got http://server:8080/proof.txt && break; sleep 1; done; echo FETCHED: $$(cat /got)"