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  • Bug#1094661: munin: Implicit cron dependency not specified

    From Holger Levsen@21:1/5 to Mark Lawrence on Sat Apr 12 16:40:01 2025
    control: severity -1 important
    thanks

    Hi Mark,

    On Wed, Jan 29, 2025 at 09:44:34PM +0100, Mark Lawrence wrote:
    If munin is installed in a minimal Debian bookworm container (e.g. with "mmdebstrap --variant=minbase") that does not have a cron installed,
    then it never runs.

    thanks for filling this bug report (and sorry for not having responded so long)!

    Before systemd I would have perhaps asked that cron be added as an
    explicit dependency. However, given that systemd is now a default
    package then I guess systemd timers and services would be more
    appropriate to include and enable (and start?).

    agreed.

    As a starting point, the following config files have at least begun populating /var/lib/munin with rrd files for me.
    mark@mon:/etc/systemd/system$ cat munin-update.timer
    [...]
    mark@mon:/etc/systemd/system$ cat munin-update.service
    [...]

    nice. did you notice any other problems / missing features without cron installed?

    I'm also wondering how to both ship the crontab entries for systems not
    running systemd while at the same preventing dual runs via systemd timer
    and cron. I'd appreciate pointers or insight on this!

    OTOH I've tagged "#1003862 munin-node fails to start on traditional sysvinit system" as wontfix, so maybe I should not bother about the non-systemd case
    and just drop those crontab files (or ship them as examples..)


    --
    cheers,
    Holger

    ⢀⣴⠾⠻⢶⣦⠀
    ⣾⠁⢠⠒⠀⣿⡁ holger@(debian|reproducible-builds|layer-acht).org
    ⢿⡄⠘⠷⠚⠋⠀ OpenPGP: B8BF54137B09D35CF026FE9D 091AB856069AAA1C
    ⠈⠳⣄

    The wrong Amazon is burning.

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  • From Holger Levsen@21:1/5 to Chris Hofstaedtler on Sat Apr 12 17:20:01 2025
    On Sat, Apr 12, 2025 at 05:10:57PM +0200, Chris Hofstaedtler wrote:
    ISTM the canonical way is exiting the cron job, like this:
    if [ -d /run/systemd/system ]; then
    exit 0
    fi

    ah! thank you, very much appreciated!


    --
    cheers,
    Holger

    ⢀⣴⠾⠻⢶⣦⠀
    ⣾⠁⢠⠒⠀⣿⡁ holger@(debian|reproducible-builds|layer-acht).org
    ⢿⡄⠘⠷⠚⠋⠀ OpenPGP: B8BF54137B09D35CF026FE9D 091AB856069AAA1C
    ⠈⠳⣄

    Bananas are berries.

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  • From gregor herrmann@21:1/5 to Chris Hofstaedtler on Sat Apr 12 18:00:01 2025
    On Sat, 12 Apr 2025 17:10:57 +0200, Chris Hofstaedtler wrote:

    On Sat, Apr 12, 2025 at 02:26:44PM +0000, Holger Levsen wrote:
    I'm also wondering how to both ship the crontab entries for systems not
    running systemd while at the same preventing dual runs via systemd timer
    and cron. I'd appreciate pointers or insight on this!

    ISTM the canonical way is exiting the cron job, like this:

    % head -n 13 /etc/cron.daily/apt-compat
    #!/bin/sh

    set -e

    # Systemd systems use a systemd timer unit which is preferable to
    # run. We want to randomize the apt update and unattended-upgrade
    # runs as much as possible to avoid hitting the mirrors all at the
    # same time. The systemd time is better at this than the fixed
    # cron.daily time
    if [ -d /run/systemd/system ]; then
    exit 0
    fi

    Or the same in the cron.d/snippet, c.f.

    % grep systemd /etc/cron.d/*
    /etc/cron.d/e2scrub_all:30 3 * * 0 root test -e /run/systemd/system || SERVICE_MODE=1 /usr/libexec/e2fsprogs/e2scrub_all_cron
    /etc/cron.d/e2scrub_all:10 3 * * * root test -e /run/systemd/system || SERVICE_MODE=1 /sbin/e2scrub_all -A -r
    /etc/cron.d/php:09,39 * * * * root [ -x /usr/lib/php/sessionclean ] && if [ ! -d /run/systemd/system ]; then /usr/lib/php/sessionclean; fi


    Cheers,
    gregor

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