ubuntu timer shutdown daily auto

ตอนตั้งค่าให้อ่านด้านล่าง  แต่ถ้ามีการแก้ไข .timer ให้ทำแบบนี้ด้วย

เมื่อคุณแก้ไขไฟล์ .timer หรือ .service แล้ว คุณจำเป็นต้องสั่งให้ systemd อ่านการตั้งค่าใหม่ครับ

ขั้นตอนที่ถูกต้องในการอัปเดตการตั้งค่าคือ:

https://chatgpt.com/share/68e645b3-3f3c-8012-a32e-e0604d720599

sudo nano /etc/systemd/system/daily-shutdown.timer   # แก้ไขเวลา

cat /etc/systemd/system/daily-shutdown.timer  # ดูเวลาที่แก้ไข

sudo systemctl daemon-reload                         # โหลดค่าใหม่

sudo systemctl restart daily-shutdown.timer          # รีสตาร์ท timer

systemctl list-timers --all | grep shutdown          # ตรวจสอบเวลาใหม่

 

For Ubuntu 24.04 Server, the best methods for scheduling an automatic shutdown without a user being logged in are systemd timers or cron jobs. These are the standard, reliable methods for running automated tasks on a Linux server.

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1. Using systemd Timers (Recommended for 24.04)

systemd is the modern and preferred init system for Ubuntu. Using its built-in timer functionality is the most robust way to schedule tasks.

Step 1: Create a service file

This file tells systemd what command to run. Create a new service file named daily-shutdown.service in the /etc/systemd/system/ directory.

Bash

sudo nano /etc/systemd/system/daily-shutdown.service

Add the following content to the file:

Ini, TOML

[Unit]
Description=Daily server shutdown service

[Service]
Type=oneshot
ExecStart=/usr/sbin/shutdown -h now

Save and close the file.

Step 2: Create a timer file

This file defines when the service should run. Create a file named daily-shutdown.timer in the same directory.

Bash

sudo nano /etc/systemd/system/daily-shutdown.timer

Add the following content, adjusting the OnCalendar line to your desired shutdown time. For example, 03:00:00 means 3:00 AM.

Ini, TOML

[Unit]
Description=Timer to trigger daily server shutdown

[Timer]
OnCalendar=*-*-* 03:00:00
Persistent=true

[Install]
WantedBy=timers.target

Save and close the file.

Step 3: Enable and start the timer

Finally, enable the timer so it starts automatically on boot and then start it manually for the first time.

Bash

sudo systemctl enable daily-shutdown.timer
sudo systemctl start daily-shutdown.timer

You can check the timer's status with sudo systemctl list-timers.

---

2. Using cron (Alternative)

cron is a classic and very reliable tool for scheduling tasks. It's simple and works on all Linux systems.

Step 1: Open the crontab editor for the root user

This ensures the job has the necessary permissions to shut down the system.

Bash

sudo crontab -e

Step 2: Add the shutdown entry

Add a new line at the end of the file. The syntax is minute hour day_of_month month day_of_week command.

• To shut down every day at 3:00 AM:

  Code snippet

  0 3 * * * /usr/bin/shutdown -h now
  

• To shut down every Friday at 10:00 PM:

  Code snippet

  0 22 * * 5 /usr/bin/shutdown -h now
  

Step 3: Save and exit

Save the file, and the cron job will be scheduled automatically.

Both methods will reliably shut down your Ubuntu 24.04 server at the specified time without requiring a user to be logged in. systemd is generally the more modern and integrated approach for current Ubuntu versions, but cron is just as effective for this task.