linux 定时休眠

#  SPDX-License-Identifier: LGPL-2.1+
#
#  This file is part of systemd.
#
#  systemd is free software; you can redistribute it and/or modify it
#  under the terms of the GNU Lesser General Public License as published by
#  the Free Software Foundation; either version 2.1 of the License, or
#  (at your option) any later version.
 
[Unit]
Description=Suspend
Documentation=man:systemd-suspend.service(8)
DefaultDependencies=no
Requires=sleep.target
After=sleep.target
 
[Service]
Type=oneshot
ExecStart=/usr/lib/systemd/systemd-sleep suspend

sudo dd if=/dev/zero of=/swapfile bs=10240 count=524288
sudo mkswap /swapfile
sudo chmod 0600 /swapfile
sudo swapon /swapfile
sudo cp /etc/fstab /etc/fstab.bak
echo "/swapfile swap swap default 0 0" |tee -a /etc/fstab

swapon
 
NAME      TYPE      SIZE USED PRIO
/dev/sda2 partition   8G 280K   -2
/swapfile file        5G   0B   -3

df /swapfile
 
文件系统          1K-块     已用     可用 已用% 挂载点
/dev/sda3      55253696 27582224 24834972   53% /

sudo filefrag -v /swapfile|head -5
Filesystem type is: ef53
File size of /swapfile is 5368709120 (1310720 blocks of 4096 bytes)
 ext:     logical_offset:        physical_offset: length:   expected: flags:
   0:        0..   32767:    4653056..   4685823:  32768:            
   1:    32768..   65535:    4685824..   4718591:  32768:

sudo sed -i '/GRUB_CMDLINE_LINUX_DEFAULT/ s!"$! resume=/dev/sda3 resume_offset=4653056"!' /etc/default/grub

sudo grub-mkconfig -o /boot/grub/grub.cfg

sudo sed -i '/^HOOKS=/ s/)/ resume)/' /etc/mkinitcpio.conf

sudo mkinitcpio -g /boot/initramfs-linux-lily.img
==> Starting build: 4.16.12-2-lily
  -> Running build hook: [base]
  -> Running build hook: [udev]
  -> Running build hook: [autodetect]
  -> Running build hook: [modconf]
  -> Running build hook: [block]
  -> Running build hook: [filesystems]
  -> Running build hook: [keyboard]
  -> Running build hook: [fsck]
  -> Running build hook: [resume]
==> Generating module dependencies
==> Creating gzip-compressed initcpio image: /boot/initramfs-linux-lily.img
==> Image generation successful

systemctl hibernate

#  SPDX-License-Identifier: LGPL-2.1+
#
#  This file is part of systemd.
#
#  systemd is free software; you can redistribute it and/or modify it
#  under the terms of the GNU Lesser General Public License as published by
#  the Free Software Foundation; either version 2.1 of the License, or
#  (at your option) any later version.
 
[Unit]
Description=Hibernate
Documentation=man:systemd-suspend.service(8)
DefaultDependencies=no
Requires=sleep.target
After=sleep.target
 
[Service]
Type=oneshot
ExecStart=/usr/lib/systemd/systemd-sleep hibernate

systemctl hybrid-sleep

#  SPDX-License-Identifier: LGPL-2.1+
#
#  This file is part of systemd.
#
#  systemd is free software; you can redistribute it and/or modify it
#  under the terms of the GNU Lesser General Public License as published by
#  the Free Software Foundation; either version 2.1 of the License, or
#  (at your option) any later version.
 
[Unit]
Description=Hybrid Suspend+Hibernate
Documentation=man:systemd-suspend.service(8)
DefaultDependencies=no
Requires=sleep.target
After=sleep.target
 
[Service]
Type=oneshot
ExecStart=/usr/lib/systemd/systemd-sleep hybrid-sleep
Sleep Hooks

man systemd-sleep
SYSTEMD-SUSPEND.SERVICE(8)  systemd-suspend.service SYSTEMD-SUSPEND.SERVICE(8)
 
NAME
       systemd-suspend.service, systemd-hibernate.service, systemd-hybrid-
       sleep.service, systemd-sleep - System sleep state logic
 
SYNOPSIS
       systemd-suspend.service
 
       systemd-hibernate.service
 
       systemd-hybrid-sleep.service
 
       /usr/lib/systemd/system-sleep
 
DESCRIPTION
       systemd-suspend.service is a system service that is pulled in by
       suspend.target and is responsible for the actual system suspend.
       Similarly, systemd-hibernate.service is pulled in by hibernate.target
       to execute the actual hibernation. Finally,
       systemd-hybrid-sleep.service is pulled in by hybrid-sleep.target to
       execute hybrid hibernation with system suspend.
 
       Immediately before entering system suspend and/or hibernation
       systemd-suspend.service (and the other mentioned units, respectively)
       will run all executables in /usr/lib/systemd/system-sleep/ and pass two
       arguments to them. The first argument will be "pre", the second either
       "suspend", "hibernate", or "hybrid-sleep" depending on the chosen
       action. Immediately after leaving system suspend and/or hibernation the
       same executables are run, but the first argument is now "post". All
       executables in this directory are executed in parallel, and execution
       of the action is not continued until all executables have finished.
 
       Note that scripts or binaries dropped in /usr/lib/systemd/system-sleep/
       are intended for local use only and should be considered hacks. If
       applications want to react to system suspend/hibernation and resume,
       they should rather use the Inhibitor interface[1].
 
       Note that systemd-suspend.service, systemd-hibernate.service, and
       systemd-hybrid-sleep.service should never be executed directly.
       Instead, trigger system sleep states with a command such as "systemctl
       suspend" or similar.
 
       Internally, this service will echo a string like "mem" into
       /sys/power/state, to trigger the actual system suspend. What exactly is
       written where can be configured in the "[Sleep]" section of
       /etc/systemd/sleep.conf or a sleep.conf.d file. See systemd-
       sleep.conf(5).
 
OPTIONS
       systemd-sleep understands the following commands:
 
       -h, --help
           Print a short help text and exit.
 
       --version
           Print a short version string and exit.
 
       suspend, hibernate, hybrid-sleep
           Suspend, hibernate, or put the system to hybrid sleep.
 
SEE ALSO
       systemd-sleep.conf(5), systemd(1), systemctl(1), systemd.special(7),
       systemd-halt.service(8)
 
NOTES
        1. Inhibitor interface
 
https://www.freedesktop.org/wiki/Software/systemd/inhibit
 
systemd 238       SYSTEMD-SUSPEND.SERVICE(8)

[Unit]
Description=Hibernate every 21:30:00
 
[Timer]
OnCalendar=*-*-* 21:30:00
Persistent=true
Unit=systemd-hibernate.service
 
[Install]
WantedBy=timers.target

sudo rtcwake -m ${mode} -t ${time_t}
# 或者
sudo rtcwake -m ${mode} -s ${seconds}