Docker: run commands on host?

I found a version that runs on pi: donaldrich/crontab-ui

But when I add a simple command like: sudo apt-get update, or apt-get update I get errors saying sudo and apt-get don’t exist, so my assumption is it is only running these commands inside the container which is kinda useless I think; is there a way to run these commands on the host?

[LordMike]

Updates:

Curiously. Editing my “root” crontab file seems to work… cron picked it up.

I mounted /var/spool/cron/crontabs/ in my container, wrote the crontab with crontab-ui and then stopped the container (to ensure only host cron runs). It failed, as /etc/crontabs didn’t exist (for logging), so all output was ditched. Created that, and then cron ran my command successfully. I found the env var CRON_PATHS controls this path, so I’ve adjusted that to /var/spool...

In the end, I have:

• Docker container controls host crontab for root (user crontab-ui runs)
• Host cron runs the crontab and outputs to a directory mounted in crontab-ui
• Crontab-ui can see my logs

docker-compose.yml

version: '2.3'

services:
  crontabui:
    image: alseambusher/crontab-ui
    environment:
      CRON_PATH: /var/spool/cron/crontabs
      CRON_DB_PATH: /mnt/systems/crontabui/data
    ports:
      - 192.168.1.10:8811:8000
    volumes:
      - ./supervisord.conf:/etc/supervisord.conf
      # Must be identical in host os
      - /var/spool/cron/crontabs:/var/spool/cron/crontabs
      - /mnt/systems/crontabui/data:/mnt/systems/crontabui/data

supervisord.conf

[supervisord]
nodaemon=true

#[program:crontab]
#command=crond -l 2 -f -c %(ENV_CRON_PATH)s
#stderr_logfile = /var/log/crontab-stderr.log
#stdout_logfile = /var/log/crontab-stdout.log

[program:crontabui]
command=node /crontab-ui/app.js
stderr_logfile = /var/log/crontabui-stderr.log
stdout_logfile = /var/log/crontabui-stdout.log

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