scheduler

Docker-Compose scheduler

Simple and lightweight service which can execute docker compose run ... services from the same file based on cron expression.

Features:

• Zero-configuration by-default
• Designed for docker compose (auto-detect, respects namespace)
• HTTP notifications with retries

Inspired by ofelia.

services:
  web:
    image: "nginx"
    labels:
      - "net.reddec.scheduler.cron=@daily"
      - "net.reddec.scheduler.exec=nginx -s reload"

  date:
    image: busybox
    restart: "no"
    labels:
      - "net.reddec.scheduler.cron=* * * * *"

  scheduler:
    image: ghcr.io/reddec/compose-scheduler:1.0.0
    restart: unless-stopped
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro

Supports two modes:

• plain docker compose run
• exec command inside service (extra label net.reddec.scheduler.exec)

Usage

Application Options:
      --project=              Docker compose project, will be automatically detected if not set [$PROJECT]

HTTP notification:
      --notify.url=           URL to invoke [$NOTIFY_URL]
      --notify.retries=       Number of additional retries (default: 5) [$NOTIFY_RETRIES]
      --notify.interval=      Interval between attempts (default: 12s) [$NOTIFY_INTERVAL]
      --notify.method=        HTTP method (default: POST) [$NOTIFY_METHOD]
      --notify.timeout=       Request timeout (default: 30s) [$NOTIFY_TIMEOUT]
      --notify.authorization= Authorization header value [$NOTIFY_AUTHORIZATION]

Help Options:
  -h, --help                  Show this help message

Notifications

Scheduler will send notifications after each job if NOTIFY_URL env variable or --notify.url flag set. Each notification is a simple HTTP request. HTTP method, attempts number, and interval between attempts can be configured. Authorization via Authorization header also supported.

Scheduler will stop retries if at least one of the following criteria met:

• reached maximum number of attempts
• server returned any 2xx code (ex: 200, 201, ...)

Outgoing custom headers:

• Content-Type: application/json
• User-Agent: scheduler/<version>, where <version> is build version
• Authorization: <value> (if set)

Payload:

{
  "project": "compose-project",
  "service": "web",
  "container": "deadbeaf1234",
  "schedule": "@daily",
  "started": "2023-01-20T11:10:39.44006+08:00",
  "finished": "2023-01-20T11:10:39.751879+08:00",
  "failed": true,
  "error": "exit code 1"
}

field error exists only if failed == true