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⚙️ systemd (Extended)

systemd is the service manager used in modern Linux systems. It controls services, startup processes and system tasks.

🔧 Managing Services

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systemctl status <service>
systemctl start <service>
systemctl stop <service>
systemctl restart <service>
systemctl enable <service>
systemctl disable <service>

🧩 Unit File Structure

Example:

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[Unit]
Description=My Custom Service
After=network.target

[Service]
ExecStart=/usr/local/bin/myapp
Restart=always
User=www-data
WorkingDirectory=/opt/myapp

[Install]
WantedBy=multi-user.target

🛠️ Reloading systemd

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sudo systemctl daemon-reload

🔍 Debugging Services

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journalctl -u <service> -xe
systemctl status <service>

🚨 Common Issues

  • Wrong ExecStart path
  • Missing permissions
  • Service not enabled
  • Syntax errors in unit file