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Cron Job Onfly

The ali00h/cronjob_without_volume Docker image can be used as a cronjob that you can schedule one or more cronjob without mounting any volumes and only using ENV.

Environment Variables

TZ=UTC
LOG_MAX_LINE_COUNT=1000
CRON_LIST=0 1 * * * wget "https://example-files.online-convert.com/document/txt/example.txt"
LOGIN_USERNAME=admin
LOGIN_PASSWORD=admin
ENV Description
TZ Your time zone
LOG_MAX_LINE_COUNT Each log file has a maximum of this number of lines. This is to avoid taking up too much disk space.
CRON_LIST You can define cronjob for one or more jobs. You can define multiple cronjob by ,
LOGIN_USERNAME Login username
LOGIN_PASSWORD Login password

Usage

If you want to schedule one or more jobs, you can define them in CRON_LIST variable in Environment Variables. For example:

30 1 * * * wget https://example-files.online-convert.com/document/txt/example.txt

that's mean everyday At 01:30, that url will be called.

30 1 * * * wget https://example-files.online-convert.com/document/txt/example.txt,0 13 2 1 * wget https://www.w3.org/TR/2003/REC-PNG-20031110/iso_8859-1.txt

that's mean everyday At 01:30, the first url will be called. and At 13:00 on day-of-month 2 in January, the second url will be called.

Note: After changing ENV you should restart your docker container.

Web interface

You can see cronjob logs report in web interface by open this url:

https://yourdomain.com/login

The username and password would be set in ENV. You can change it whenever you want.

In dashbord you can see the list of cronjobs and by clicking each one, you can see datetime of job events and response of them.

Docker

Just run:

docker run -d -p 8099:80 \
  --env TZ="UTC" \
  --env LOG_MAX_LINE_COUNT="1000" \
  --env CRON_LIST="0 1 * * * wget https://example-files.online-convert.com/document/txt/example.txt" \  
  --env LOGIN_USERNAME="admin" \
  --env LOGIN_PASSWORD="admin" \    
  ali00h/cronjob_without_volume:latest

Docker Compose

Create docker-compose.yml with this content:

version: "3"
services:
  cronjob:
    image: "ali00h/cronjob_without_volume"
    container_name: cronjob-without-volume
    restart: always
    ports:
      - "8099:80"    
    environment:
      - TZ=UTC
      - LOG_MAX_LINE_COUNT=1000      
      - CRON_LIST=* * * * * wget https://example-files.online-convert.com/document/txt/example.txt
      - LOGIN_USERNAME=admin
      - LOGIN_PASSWORD=admin

and run:

docker-compose up -d

check cron job:

crontab -l

Docker Compose For Permanent Logs

If you want to keep logs after container restart, you can use volume for log directory. for example docker-compose.yml would be:

version: "3"
services:
  cronjob:
    image: "ali00h/cronjob_without_volume"
    container_name: cronjob-without-volume
    restart: always
    ports:
      - "8099:80"    
    environment:
      - TZ=UTC
      - LOG_MAX_LINE_COUNT=1000      
      - CRON_LIST=* * * * * wget https://example-files.online-convert.com/document/txt/example.txt
      - LOGIN_USERNAME=admin
      - LOGIN_PASSWORD=admin  
    volumes:
      - ./cronlog/:/var/log/cronlog/