#!/bin/bash
# 查哪些服务真在跑、哪些是遗留（只读）
set -u

echo "════════ 1. MySQL / MariaDB ════════"
for svc in mysql mariadb mysqld; do
    st=$(systemctl is-active $svc 2>/dev/null)
    en=$(systemctl is-enabled $svc 2>/dev/null)
    if [ -n "$st" ] || [ -n "$en" ]; then
        echo "  $svc: active=$st enabled=$en"
    fi
done
echo "  进程: $(pgrep -c -f 'mysqld|mariadb' 2>/dev/null || echo 0) 个"
pgrep -a -f 'mysqld|mariadb' 2>/dev/null | head -3 | sed 's/^/    /'
echo "  数据目录: $(du -sh /var/lib/mysql 2>/dev/null | awk '{print $1}')"
echo "  包还在不在: $(dpkg -l 2>/dev/null | grep -cE '^ii +(mysql|mariadb)' ) 个已安装"

echo
echo "════════ 2. nginx ════════"
echo "  active=$(systemctl is-active nginx 2>/dev/null) enabled=$(systemctl is-enabled nginx 2>/dev/null)"
pgrep -a nginx 2>/dev/null | head -3 | sed 's/^/    /' || echo "    进程没在跑"
echo "  nginx 目录: $(du -sh /etc/nginx /var/www /var/log/nginx 2>/dev/null | tr '\n' ' ')"

echo
echo "════════ 3. 谁在监听端口 ════════"
ss -tulpn 2>/dev/null | head -20 | sed 's/^/  /'

echo
echo "════════ 4. 这三个服务和中转有关吗 ════════"
echo "  中转用到的是: 8080(relay) / 20241(metrics) / 80,443(隧道出口不需要)"
echo "  ---"
for p in 80 443 3306 8080 20241; do
    who=$(ss -tulpn 2>/dev/null | grep ":$p " | head -1 | awk '{print $NF}')
    printf "    端口 %-6s %s\n" "$p" "${who:-（没人监听）}"
done

echo
echo "════════ 5. 历史遗留的 apt 残留配置（不占空间，但可以清）════════"
dpkg -l 2>/dev/null | awk '$1=="rc" {print $2}' | tr '\n' ' ' | sed 's/^/  /'
echo

echo
echo "════════ 6. /root 下我自己留下的脚本（172 个，都很小）════════"
ls -1 /root/*.sh /root/*.py 2>/dev/null | wc -l | sed 's/^/  数量: /'
du -ch /root/*.sh /root/*.py 2>/dev/null | tail -1 | sed 's/^/  合计: /'

echo
echo "════════ 7. 汇总：清理能省多少 ════════"
echo "  apt cache + lists:  约 162 MB"
echo "  journald 压缩:      约  10 MB"
echo "  /var/log 截断:      约  10 MB"
echo "  MySQL 数据（若不用）: 113 MB"
echo "  /root 调试脚本:     约   2 MB"
echo "  ----------"
echo "  合计（保守，保留 MySQL）: 约 184 MB"
echo "  合计（MySQL 也不用了）  : 约 297 MB"