# K3s inside Docker-in-Docker
# A lightweight Kubernetes cluster running inside a Docker container
# See README.md for usage instructions

x-defaults: &defaults
  restart: unless-stopped
  logging:
    driver: json-file
    options:
      max-size: 100m
      max-file: "3"

services:
  k3s:
    <<: *defaults
    image: ${GLOBAL_REGISTRY:-}alexsuntop/k3s-inside-dind:${K3S_DIND_VERSION:-0.2.2}
    build:
      context: .
      dockerfile: Dockerfile
      platforms:
        - linux/amd64
        - linux/arm64
      args:
        K3S_VERSION: ${K3S_VERSION:-v1.28.2+k3s1}
        PRELOAD_IMAGES: ${PRELOAD_IMAGES:-true}
    privileged: true
    volumes:
      - k3s_data:/var/lib/rancher/k3s
      - docker_data:/var/lib/docker
    ports:
      - "${K3S_API_PORT_OVERRIDE:-6443}:6443"  # Kubernetes API server
      - "${DOCKER_TLS_PORT_OVERRIDE:-2376}:2376"  # Docker daemon TLS port
    environment:
      - TZ=${TZ:-UTC}
      - K3S_TOKEN=${K3S_TOKEN:-}
      - K3S_DISABLE_SERVICES=${K3S_DISABLE_SERVICES:-traefik}
      - K3S_NODE_NAME=${K3S_NODE_NAME:-k3s-server}
    healthcheck:
      test: ["CMD", "k3s", "kubectl", "get", "--raw", "/healthz"]
      interval: 30s
      timeout: 10s
      retries: 5
      start_period: 60s
    deploy:
      resources:
        limits:
          cpus: ${K3S_DIND_CPU_LIMIT:-2.00}
          memory: ${K3S_DIND_MEMORY_LIMIT:-4G}
        reservations:
          cpus: ${K3S_DIND_CPU_RESERVATION:-0.50}
          memory: ${K3S_DIND_MEMORY_RESERVATION:-1G}

volumes:
  k3s_data:
  docker_data: