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x-yuri/docker + cron + \proc\1\fd.md

Last active February 5, 2023 14:48
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docker + cron + /proc/1/fd
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docker + cron + \proc\1\fd.md

docker + cron + /proc/1/fd

The trick doesn't work with non-root users.

docker-compose.yml:

services:
  cron:
    build: .
    command: cron -f

Dockerfile:

FROM ubuntu:23.04
COPY crontab .
RUN set -x \
    && apt-get update \
    && apt-get install cron \
    && useradd app \
    && crontab -u app crontab

crontab:

* * * * * date >/proc/1/fd/1 2>/proc/1/fd/2

$ docker-compose up
(no output and date doesn't get executed)
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