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funnyzak/cron

By funnyzak

•Updated over 1 year ago

a lightweight service that runs in the background and executes scheduled tasks.

Image
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funnyzak/cron repository overview

⁠Cron

Docker Tags Image Size Docker Stars Docker Pulls

cron is a lightweight service that runs in the background and executes scheduled tasks. It builds on the official alpine image and includes dcron as the cron service. The image is available for multiple architectures, including linux/386, linux/amd64, linux/arm/v6, linux/arm/v7, linux/arm64/v8, linux/ppc64le, linux/riscv64, linux/s390x.

Installed packages: dcron, ca-certificates, curl, tar, tzdata, bash, zip, unzip, rsync.

⁠Pull the Image

# Docker Hub
docker pull funnyzak/cron:latest
# GitHub Container Registry
docker pull ghcr.io/funnyzak/cron:latest
# Aliyun Registry
docker pull registry.cn-beijing.aliyuncs.com/funnyzak/cron:latest

⁠How to Use

⁠Environment Variables
  • CRON_STRINGS: Crontab strings, separated by \n.
  • STARTUP_COMMANDS: Commands to run before starting the cron service.
  • EXTRA_PACKAGES: Optional, Specify extra packages to install. Default is empty. e.g. mysql-client mariadb-connector-c.

CRON_STRINGS example:

Single job:

# Run every minute
* * * * * /scripts/echo.sh >> /var/log/cron/cron.log 2>&1

Multiple jobs:

# Multiple jobs
* * * * * /scripts/request.sh >> /var/log/cron/cron.log 2>&1\n* * * * * /scripts/echo.sh >> /var/log/cron/cron.log 2>&1
⁠Crontab Files

crontab files are located in /etc/cron.d, you can mount a volume to this directory to add your own crontab files.

For example, you can create a file named my-cron with the following content:

* * * * * /scripts/request.sh >> /var/log/cron/cron.log 2>&1

Note: Default log file should be /var/log/cron/cron.log. You should forward all script output to this file.

⁠Usage

⁠Using CRON_STRINGS
docker run --name="cron" -d \
  -e 'CRON_STRINGS=* * * * * echo "Hi, i am cron." >> /var/log/cron/cron.log 2>&1' \
  funnyzak/cron

docker run --name="cron1" -d \
  -e 'CRON_STRINGS=* * * * * /scripts/echo.sh >> /var/log/cron/cron.log 2>&1' \
  funnyzak/cron

docker run --name="cron2" -d \
  -e 'CRON_STRINGS=* * * * * /scripts/echo.sh >> /var/log/cron/cron.log 2>&1' \
  -e 'STARTUP_COMMANDS=echo "Hello, World!"' \
  -e 'EXTRA_PACKAGES=git' \
  funnyzak/cron

docker run --name="cron5" -d \
  -e 'CRON_STRINGS=* * * * * /scripts/request.sh >> /var/log/cron/cron.log 2>&1' \
  -e 'STARTUP_COMMANDS=/scripts/echo.sh >> /var/log/cron/cron.log 2>&1' \
  funnyzak/cron
⁠Using Crontab Files
docker run --name="cron6" -d \
  -v ./cron/crontabs:/etc/cron.d \
  -v ./cron/scripts:/scripts \
  funnyzak/cron
⁠Compose Example
version: '3'
services:
  cron:
    image: funnyzak/cron
    privileged: true
    container_name: cron
    environment:
      - TZ=Asia/Shanghai
      - LANG=C.UTF-8
      - CRON_TAIL=1
      - CRON_STRINGS=* * * * * /scripts/echo.sh >> /var/log/cron/cron.log 2>&1
    restart: on-failure
    volumes:
      - ./cron/scripts:/scripts
      - ./cron/crontabs:/etc/cron.d

Tag summary

Content type

Image

Digest

sha256:0f893fd0e…

Size

8 MB

Last updated

over 1 year ago

docker pull funnyzak/cron