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crond

This mircroservice was inspired by Running cron jobs in a Docker Alpine container.

crond's image is quite minimalist. It runs scripts under /etc/periodic/* using run-parts. Note that your scipts can't be *.sh since run-parts is capricious:

run-parts runs a number of scripts or programs found in a single directory directory.
Filenames should consist entirely of upper and lower case letters, digits, underscores, and hyphens.
Subdirectories of directory and files with other names will be silently ignored.

Scripts must follow the #!/bin/interpretername convention in order to be executed.
They will not automatically be executed by /bin/sh.

The files found will be run in the lexical sort order of the filenames.

run-parts's man page

Help​

crond --help
BusyBox v1.34.1 (2022-04-04 10:19:27 UTC) multi-call binary.

Usage: crond [-fbS] [-l N] [-d N] [-L LOGFILE] [-c DIR]

        -f      Foreground
        -b      Background (default)
        -S      Log to syslog (default)
        -l N    Set log level. Most verbose 0, default 8
        -d N    Set log level, log to stderr
        -L FILE Log to FILE
        -c DIR  Cron dir. Default:/var/spool/cron/crontabs