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infrastructure/servers/systemd-services/SKILL.md

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+---
+name: systemd-services
+description: Create and manage systemd services and timers. Configure service dependencies and resource limits. Use when managing system services.
+license: MIT
+metadata:
+  author: devops-skills
+  version: "1.0"
+---
+
+# Systemd Services
+
+Manage system services with systemd.
+
+## Service Unit File
+
+```ini
+# /etc/systemd/system/myapp.service
+[Unit]
+Description=My Application
+After=network.target
+
+[Service]
+Type=simple
+User=myapp
+WorkingDirectory=/opt/myapp
+ExecStart=/opt/myapp/bin/start
+ExecStop=/opt/myapp/bin/stop
+Restart=always
+RestartSec=5
+Environment=NODE_ENV=production
+
+[Install]
+WantedBy=multi-user.target
+```
+
+## Service Management
+
+```bash
+systemctl daemon-reload
+systemctl start myapp
+systemctl stop myapp
+systemctl restart myapp
+systemctl enable myapp
+systemctl status myapp
+journalctl -u myapp -f
+```
+
+## Timer (Cron Replacement)
+
+```ini
+# /etc/systemd/system/backup.timer
+[Unit]
+Description=Daily backup
+
+[Timer]
+OnCalendar=daily
+Persistent=true
+
+[Install]
+WantedBy=timers.target
+```
+
+## Resource Limits
+
+```ini
+[Service]
+MemoryLimit=512M
+CPUQuota=50%
+```
+
+## Best Practices
+
+- Use Type=notify for better tracking
+- Implement proper restart policies
+- Use timers instead of cron
+- Set resource limits