dnf-automatic を使用したパッケージの自動更新と必要に応じて再起動をする方法を説明します。

インストール

# dnf install dnf-automatic

設定ファイルのコピー

# cp /usr/share/dnf5/dnf5-plugins/automatic.conf /etc/dnf/dnf5-plugins/automatic.conf

設定ファイルの編集

「/etc/dnf/dnf5-plugins/automatic.conf」

・必要に応じてシステムを再起動する設定にしています。

・変更内容を email で送信する様にしています。（Postfix が localhost で動いている前提です）

# This configuration file is managed by the dnf5-plugin-automatic package.
# Please do not edit it. To make changes in dnf5 automatic configuration
# edit /etc/dnf/automatic.conf and make your adjustments there.

[commands]
# Whether updates should be applied when they are available, by
# dnf5 automatic.
apply_updates = yes

# Whether updates should be downloaded when they are available, by
# dnf5 automatic.
download_updates = yes

# Maximum time in seconds to wait until the system is on-line and able to
# connect to remote repositories.
# 0 means that network availability detection will be skipped.
network_online_timeout = 60

# Maximum random delay in seconds before downloading (only applied if
# ``--timer`` option was used). Note that, by default, the ``systemd`` timers
# also apply a random delay of up to 1 hour.
random_sleep = 0

# What kind of upgrade to perform:
# default                            = all available upgrades
# security                           = only the security upgrades
upgrade_type = default

# When the system should reboot following upgrades:
# never                              = don't reboot after upgrades
# when-changed                       = reboot after any changes
# when-needed                        = reboot when necessary to apply changes
#reboot = never
reboot = when-needed

# The command that is run to trigger a system reboot.
reboot_command = "shutdown -r +5 'Rebooting after applying package updates'"


[emitters]
# Name to use for this system in messages that are emitted.  Default is the
# hostname.
# system_name = my-host

# How to send messages.  Valid options are stdio, command, command_email,
# email, and motd. Multiple comma separated options can be specified.
# stdio: messages will be sent to stdout; this is useful to have cron send the
#   messages.
# command: to send result to a custom command.
# email: dnf5 automatic will send email itself according to the configured
#   options.
# motd: /etc/motd.d/dnf5-automatic file will have the messages.
# command_email: then messages will be send via a shell command compatible with
#   sendmail.
# If emit_via is left blank, no messages will be sent.
# emit_via = stdio
emit_via = email

# Whether to emit a message when nothing interesting happened - the operation
# succeeded and no packages were available/installed.
emit_no_updates = yes


[command]
# The shell command to execute.
# command_format = "cat"

# The contents of stdin to pass to the command. Variable `body` with the message
# body is usable.
# stdin_format = "{body}"


[command_email]
# The shell command to use to send email. Variables `subject`, `email_from`,
# and `email_to` are available.
# command_format = "mail -Ssendwait -s {subject} -r {email_from} {email_to}"

# The contents of stdin to pass to the command. It is a format string with the
# same arguments as `command_format`.
# stdin_format = "{body}"

# The address to send email messages from.
email_from = root

# List of addresses to send messages to.
email_to = root


[email]
# The address to send email messages from.
email_from = user@example.com

# List of addresses to send messages to.
email_to = user@example.com

# Name of the host to connect to to send email messages.
email_host = localhost

# Port number to connect to at the email host.
email_port = 25

# Use TLS or STARTTLS to connect to the email host.
# Available values are "no", "yes", and "starttls"
email_tls = no

# Credentials to use for SMTP server authentication are taken from .netrc file


[base]
# This section overrides config values from the dnf.conf (see man dnf.conf for
# available options).

タイマーの設定

# systemctl enable --now dnf5-automatic.timer

タイマーの確認

# systemctl list-timers
NEXT                            LEFT LAST                           PASSED UNIT                         ACTIVATES                     
Thu 2025-07-17 16:05:30 JST 4h 32min Thu 2025-07-17 04:55:11 JST         - certbot-renew.timer          certbot-renew.service
Fri 2025-07-18 00:00:00 JST      12h Thu 2025-07-17 00:00:06 JST         - unbound-anchor.timer         unbound-anchor.service
Fri 2025-07-18 00:09:16 JST      12h Thu 2025-07-17 00:05:33 JST         - logrotate.timer              logrotate.service
Fri 2025-07-18 00:44:19 JST      13h Thu 2025-07-17 00:38:48 JST         - plocate-updatedb.timer       plocate-updatedb.service
Fri 2025-07-18 06:43:03 JST      19h -                                   - dnf5-automatic.timer         dnf5-automatic.service
Fri 2025-07-18 10:59:02 JST      23h Thu 2025-07-17 10:59:02 JST 33min ago systemd-tmpfiles-clean.timer systemd-tmpfiles-clean.service
Sun 2025-07-20 01:00:00 JST   2 days Sun 2025-07-13 01:00:02 JST         - raid-check.timer             raid-check.service
Mon 2025-07-21 00:02:34 JST   3 days Mon 2025-07-14 01:09:27 JST         - fstrim.timer                 fstrim.service

8 timers listed.
Pass --all to see loaded but inactive timers, too.