Today I Learned
Today I Learned
  • TIL
  • Ansible
    • Add Authorized SSH Key to User using Ansible
    • Add User to System using Ansible
    • Ansible Configure Default Inventory File
    • Ansible Disable Python Interpreter Warnings
    • Ansible Pause Playbook Execution
    • Ansible Test Connection
    • Run Ansible Playbook Locally
    • Setting a Password in Ansible Inventory File
  • Caddy
    • Caddy Write Logs to a File
    • Return Client IP Address As Plain Text
  • Cheatsheet(s)
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  • Docker
    • Docker Build Multiple Tags At Once
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    • Docker Publish Port
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    • Docker Fix UFW Security Flaw
    • Install Docker
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    • Run Docker without Root
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  • Git
    • Change Last Commit Message
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  • GitHub
    • GitHub Actions
      • Running Jobs in a Container
      • Setting An Environment Variable
  • Go
    • Convert String To Uppercase in Go
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    • Update Project Libraries To Latest
  • Learning Resource(s)
    • Algorithms
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  • Linux
    • Add Swap Space To System
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    • Changing User Password In Shell Script
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    • CMake Parallel Build with All Cores
    • Create Symbolic Links
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    • Fix Permission For Newly Created Partitions
    • Fix Windows And Linux Different Time Issue
    • Get Arch Of System
    • Increase Limit of Inotify Watchers
    • Install Latest NodeJS In Linux
    • Install Pavucontrol
    • Install Postman
    • Kill A Process In Linux
    • Mount Partition On System Startup
    • OpenVPN Server
    • Ping over TCP
    • Pipe Password to Sudo
    • Remove PPA From System
    • Remove User Password
    • Root Check
    • Run Go Binaries Without Installing Go
    • Set Different Time Zone
    • Show Disk Usage By Directories
    • Show Public IP
    • Show Size of Current Directory
    • System Upgrade
    • Tar Exclude Directories
    • Tar Retain File Permissions
    • Why All Users Can Write to /tmp
    • Alpine Linux
      • Adding User On Alpine
      • Changing Timezone On Alpine
      • Installing Ansible On Alpine
      • Install Dig On Alpine
      • Installing Pip On Alpine
      • Installing Python2 On Alpine
    • Apt
      • apt-fix-broken-packages
      • APT Hold Package(s) From Upgrades
    • Arch Linux
      • Install Docker Compose
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    • BASH
      • Bash List Only Directories
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      • "set -e" In Scripts
      • Set MacOS Like Terminal Font
      • Set Unlimited Bash History
      • shell-formatter
      • Test Regular Expression Against A String
      • Yes
    • Curl
      • Fix Failed Writing Body While Piping
      • Use Proxy Server in cURL
    • Fedora Linux
      • Install RPM Packages in Fedora
    • GPG
      • Fix "Inappropriate ioctl for device" Error
      • GPG Import Keys
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    • Grep
      • Grep Case Insensitive Search
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      • Remove Empty Lines
    • Journalctl
      • Get Errors in Running Services using Journalctl
    • Networking
      • Install Dig
      • Install MTR
      • Set Metric For A Network Using nmcli
      • WireGuard Server
    • Raspberry Pi
      • Disable Swap Memory on SD Card
    • SSH
      • Reconnect To a Disconnected SSH Session
      • Run A Local Script On Remote SSH Server
      • Screen
      • Tmux
    • Systemd
      • Create A Service
      • Create A Systemd Timer
      • List Systemd Services Of A User
      • Prevent Systemd Timers from Overlapping
      • Watch Systemd Service Status
    • Tcpdump
      • Capture ICMP Packets
      • Capture Traffic By An IP Address Or A Network
    • Ubuntu
      • Get Clipboard History
      • Install HMAC256 On Ubuntu
      • Obtaining a List of Ubuntu Repository Mirror Servers
    • Wget
      • Basic Auth
  • Miscellaneous
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  • Python
    • Add An Item To Dictionary
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    • Check If a String is Empty
    • Check Image Size
    • Check Python Version Programmatically
    • Convert List To Tuple
    • Execute Python Code In Command Shell
    • Formatted Strings
    • Get IP Address From Hostname
    • Limit Floating Point To Two Decimal Places
    • Measure Latency Using TCP
    • pass-list-as-argument-to-a-function
    • Print Tabular Data
    • Python Padding Strings
    • Read A File Line By Line
    • Remove A File
    • Remove Trailing Spaces And New Lines From A String
    • Run Python Script in Background
    • Split String with Delimiter
    • Validate IP Address
    • Pipenv
      • Install Dependencies System Wide
      • Remove Virtualenv (Virtual Environment)
  • Rclone
    • Limit Upload Download Speeds in Rclone
  • ReactJS
    • ReactJS Resources
  • Vagrant
    • Increase RAM And CPU On Vagrant Machine
    • Vagrant Specify Disk Size
  • VS Code
    • Install VS Code on a Linux Server
  • WSL
    • Convert WSL1 to WSL2
    • Enable Systemd Support in WSL2 (Obsolete)
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  • Example: Running a Command Automatically After System Boot
  • 1. Create a systemd service file, for example: test_timer.service
  • 2. Now, create a timer file with the same name, for example: test_timer.timer
  • 3. Enable & Start the Systemd Timer
  1. Linux
  2. Systemd

Create A Systemd Timer

Systemd timers are a powerful alternative to cron for scheduling tasks, especially when you want better integration with system events like startup or specific conditions. Example of creating a simple systemd timer is given below -

Example: Running a Command Automatically After System Boot

1. Create a systemd service file, for example: test_timer.service

[Unit]
Description=Example Systemd Service File.

[Service]
Type=oneshot
User=<username>
ExecStart=/usr/bin/ping -c 10 google.com

[Install]
WantedBy=multi-user.target

2. Now, create a timer file with the same name, for example: test_timer.timer

[Unit]
Description=Example Systemd Timer.

[Timer]
OnBootSec=5m

[Install]
WantedBy=timers.target

Note: OnBootSec=5m ensures the service starts 5 minutes after the system boots up. Adjust the value based on your needs (e.g., 10s for 10 seconds)

3. Enable & Start the Systemd Timer

sudo systemctl enable test_timer.timer
sudo systemctl start test_timer.timer

To check if the Systemd timer is enabled, we can use systemctl list-timers command to list out the various Systemd timer enabled on the system.

Source(s):

PreviousCreate A ServiceNextList Systemd Services Of A User

Last updated 5 months ago

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