Check Systemd Service Is Running

# Quick check (suitable for use in scripts)
if systemctl is-active --quiet nginx; then
    echo "nginx is running"
fi

# Restart if down
if ! systemctl is-active --quiet php8.3-fpm; then
    echo "php-fpm down, restarting…"
    systemctl restart php8.3-fpm
fi

# Detailed status
systemctl status nginx --no-pager

# Recent log lines from a unit
journalctl -u nginx -n 50 --no-pager
journalctl -u nginx --since "10 minutes ago"

# Watch a service's logs in real time
journalctl -u myapp -f