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Linux df 命令深度解析:从磁盘空间监控到 inode 耗尽排查

  • 2026-07-01 11:59:59
Linux df 命令深度解析:从磁盘空间监控到 inode 耗尽排查

服务器磁盘满了,SSH 登录都报错 No space left on device。第一反应就是敲 df -h,但有时候明明显示还有空间,却还是报错——这是 inode 耗尽了。深入了解 df 命令后,发现这个看似简单的工具其实藏着不少门道。

df 的底层实现:statvfs 系统调用

df 命令的核心数据来自 statvfs() 系统调用,它返回文件系统的统计信息:

#include<sys/statvfs.h>intstatvfs(constchar *path, struct statvfs *buf);struct statvfs {  unsigned long f_bsize;    // 文件系统块大小  fsblkcnt_t    f_blocks;   // 总块数  fsblkcnt_t    f_bfree;    // 空闲块数  fsblkcnt_t    f_bavail;   // 普通用户可用块数  fsfilcnt_t    f_files;    // 总 inode 数  fsfilcnt_t    f_ffree;    // 空闲 inode 数  // ...};

关键点在于 f_bfree 和 f_bavail 的区别:

  • f_bfree
    :文件系统实际的空闲块数
  • f_bavail
    :普通用户可用的块数(预留了 5% 给 root)

这就是为什么 df -h 显示 Use% 会超过 100% —— root 用户可以继续写入,直到用完那 5% 预留空间。

常用参数详解

-h:人类可读格式 (Human-Readable Format)

 df -iFilesystem      Inodes  IUsed  IFree IUse% Mounted on/dev/sda1       655360 655350     10  100% /

这就是 inode 耗尽的典型表现:Use% 只有 90%,但 IUse% 是 100%。大量小文件(比如日志切分、缓存文件)会消耗 inode,即使磁盘空间还充足。

-T:显示文件系统类型

 df -h --totalFilesystem      Size  Used Avail Use% Mounted on/dev/sda1       100G   85G   10G  90% //dev/sdb1       200G   50G  150G  20% /datatotal           300G  135G  160G  45% -

适合快速统计总容量。

实战场景

1. 磁盘空间预警脚本

#!/bin/bash# 监控磁盘使用率,超过阈值发邮件告警THRESHOLD=80df -H | grep -vE '^Filesystem|tmpfs|cdrom' | while read line; do    usage=line" | awk '{print (echo "NF}')    if [ "THRESHOLD" ]; then        echo "警告: {usage}%" | mail -s "磁盘空间告警" admin@example.com    fidone

2. inode 耗尽排查

# 查找哪个目录 inode 最多for dir in /*; do    if [ -d "(find "count  df -h | wc -l127

系统运行久了会有很多挂载点,df 会逐个查询,可能变慢。

常见陷阱

1. 删除文件后空间未释放

 rm -f /data/large_file lsof +L1COMMAND   PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAMEnginx    1234 www-data   3w   REG  8,17  50G  123 /data/large_file (deleted)# 重启 nginx 释放空间 df -h //dev/sda1       100G   95G    0G  95% /# 普通用户写入失败 df -h /dev/shmtmpfs           7.8G     0  7.8G   0% /dev/shm

tmpfs 占用的是内存,写入大文件会导致内存不足。生产环境建议限制大小:

mount -o remount,size=2G /dev/shm

Web 实现:浏览器端磁盘监控

虽然浏览器无法直接访问本地磁盘,但可以通过 Web API 实现"虚拟磁盘"概念:

// 使用 Storage API 监控 localStorage 配额async function checkStorageQuota() {  const estimate = await navigator.storage.estimate()  const usedMB = (estimate.usage || 0) / 1024 / 1024  const quotaMB = (estimate.quota || 0) / 1024 / 1024  const percent = ((estimate.usage || 0) / (estimate.quota || 1)) * 100  return {    used: usedMB.toFixed(2) + ' MB',    quota: quotaMB.toFixed(2) + ' MB',    percent: percent.toFixed(1) + '%',    warning: percent > 80  }}// 模拟 df -h 输出function formatDiskInfo(info: DiskInfo): string {  const pad = (str: string, len: number) => str.padEnd(len)  return [    pad('Filesystem'20),    pad('Size'10),    pad('Used'10),    pad('Avail'10),    pad('Use%'6),    'Mounted on'  ].join(' ') + '\n' +  [    pad(info.fs, 20),    pad(info.total, 10),    pad(info.used, 10),    pad(info.avail, 10),    pad(info.percent, 6),    info.mount  ].join(' ')}

深入了解 df 命令后,发现它不只是一个简单的磁盘查看工具。从 inode 耗尽到预留空间,从 NFS 超时到文件占用,每个场景都有对应的排查思路。下次遇到磁盘问题,别只看 Use%,记得 -i 也看看。

Linux du 命令参考

相关工具:内存单位转换器 | 端口检测器

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  1. CONNECT:[ UseTime:0.000925s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001425s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000692s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000705s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001471s ]
  6. SELECT * FROM `set` [ RunTime:0.000554s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001628s ]
  8. SELECT * FROM `article` WHERE `id` = 493891 LIMIT 1 [ RunTime:0.001173s ]
  9. UPDATE `article` SET `lasttime` = 1783048627 WHERE `id` = 493891 [ RunTime:0.002029s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000620s ]
  11. SELECT * FROM `article` WHERE `id` < 493891 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001101s ]
  12. SELECT * FROM `article` WHERE `id` > 493891 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.007238s ]
  13. SELECT * FROM `article` WHERE `id` < 493891 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003416s ]
  14. SELECT * FROM `article` WHERE `id` < 493891 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002471s ]
  15. SELECT * FROM `article` WHERE `id` < 493891 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002360s ]
0.118537s