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https://github.com/nicomt/ckron
🐋 A cron-like job scheduler for docker
https://github.com/nicomt/ckron
cron cronjob docker javascript linux nodejs scheduler
Last synced: about 2 months ago
JSON representation
🐋 A cron-like job scheduler for docker
- Host: GitHub
- URL: https://github.com/nicomt/ckron
- Owner: nicomt
- License: isc
- Created: 2020-09-26T06:31:31.000Z (almost 4 years ago)
- Default Branch: master
- Last Pushed: 2024-06-09T06:03:04.000Z (4 months ago)
- Last Synced: 2024-07-12T05:06:14.989Z (3 months ago)
- Topics: cron, cronjob, docker, javascript, linux, nodejs, scheduler
- Language: JavaScript
- Homepage:
- Size: 650 KB
- Stars: 51
- Watchers: 1
- Forks: 5
- Open Issues: 11
-
Metadata Files:
- Readme: readme.md
- License: license.md
Awesome Lists containing this project
- awesome-docker - ckron - A cron-style job scheduler for docker, by [@nicomt](https://github.com/nicomt) (Docker Images / Base Tools)
README
# ckron
> A cron-style job scheduler for docker
[](https://www.npmjs.org/package/ckron)
[](https://github.com/nicomt/ckron/actions)
[](https://hub.docker.com/r/nicomt/ckron)
`ckron` is a versatile and straightforward tool to schedule operations on containerized applications.
`ckron` is heavily inspired by [ofelia](https://github.com/mcuadros/ofelia) but attempts to improve on it by allowing multiple [tasks](#tasks) per `job`. Using `tasks`, you can compose complex workflows with a few off-the-shelf images and follow Docker's motto of one process per container.
## Install
If you have Node installed:
```
$ npm i -g ckron
```
If you only have Docker installed:
```
$ docker pull nicomt/ckron
```
## Usage
If you installed it in Node:
```
$ ckron daemon --config /path/to/config.yml
```
If you installed it in Docker:
```
$ docker run --rm -it \
-v $PWD/config.yml:/etc/ckron/config.yml \
-v /var/run/docker.sock:/var/run/docker.sock \
nicomt/ckron daemon
```
> **_NOTE:_** For production is recommended to use docker with a [restart policy](https://docs.docker.com/config/containers/start-containers-automatically/) or create a service in something like [systemd](https://medium.com/@benmorel/creating-a-linux-service-with-systemd-611b5c8b91d6), upstart or [forever](https://www.npmjs.com/package/forever). A service will ensure the daemon is restarted in case of an unexpected failure
## Configuration
The configuration consists of a YAML file, which is meant to have familiar `docker compose` like syntax. The main sections of the config file are the following:
### Tasks
Single operations that can be carried out by a job. Tasks currently supported are:
- `run`: Runs a command inside of a new container, using a specific image.
- `exec`: Runs a new command in a running container
- `signal`: Send a signal to the main process inside the container. Similar to `docker kill --signal`
See [tasks reference](docs/tasks.md) for more documentation
### Jobs
Jobs are sets of tasks scheduled with a cron-like syntax. See [jobs reference](docs/jobs.md) for more documentation
### Notifiers
Notification channels for failed jobs. See [notifiers reference](docs/notifiers.md) for more documentation
### YAML Full Example
Run with `$ ckron daemon --config /path/to/config.yml`
```yml
tasks:
test-01:
type: run
command: printenv
environment:
HELLO: World
image: ubuntu:latest
jobs:
job-01:
schedule: "*/30 * * * * *"
on_error: ["email-dev"]
run_on_init: true
tasks:
- test-01
notifiers:
email-dev:
type: email
smtp_host: smtp.server.com
smtp_port: 25
smtp_auth:
user: XXXXXXX
pass: XXXXXXX
to: [email protected]
from: '"Ckron Scheduler" '
```