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Linux 下快速找出“删除了但空间没释放”的大文件

  • 2026-07-04 21:32:16
Linux 下快速找出“删除了但空间没释放”的大文件

生产环境经常出现这种情况:

df -h
BASH

显示:

/ 分区 95%

但是:

du -sh /*
BASH

统计出来却只有:

60%

空间凭空消失了。

常见场景:

  • Oracle alert.log 被删除
  • MySQL slow.log 被删除
  • Java GC 日志被删除
  • Kafka 日志文件被删除
  • 应用日志切割异常

此时:

rm 已经执行 空间却没有回来
BASH

很多 DBA 会重启服务。

其实不用。


核心原理

Linux 文件删除后:

目录项删除

但如果进程仍然打开该文件:

inode 仍然存在

空间不会释放。

只有:

进程关闭文件描述符 或者: 进程退出

空间才会真正归还给文件系统。


快速排查命令

方法一:lsof(推荐)

lsof | grep deleted

输出示例:

java12345 oracle15w REG253,0120G1234567 /tmp/gc.log (deleted)
CPP

含义:

PID=12345 占用120G 文件已删除

只看大文件

lsof -nP | grep deleted

或者:

lsof | grep deleted | awk'{print $7,$1,$2,$9}' |sort -nr
BASH

输出:

128849018880java1234568719476736mysqld2345
YAML

查看某个进程占用的删除文件

例如:

ls -l /proc/12345/fd
BASH

输出:

15 ->/tmp/gc.log (deleted)
JAVASCRIPT

释放空间(无需重启)

假设:

PID=12345FD=15

执行:

echo > /proc/12345/fd/15
BASH

或者:

cat /dev/null > /proc/12345/fd/15
BASH

立即释放空间。


查看释放效果

执行前:

df -h 95%
BASH

执行后:

df -h 60%
BASH

Oracle 场景

经常发生:

rm alert_orcl.log
BASH

但监听或数据库进程仍然持有文件。

排查:

lsof | grep alert

输出:

oracle12345 oraclealert_orcl.log (deleted)
CPP

处理:

echo > /proc/12345/fd/7
BASH

MySQL 场景

典型情况:

rm mysql-slow.log
BASH

mysqld 仍然持有文件。

查看:

lsof | grep mysql-slow

推荐处理:

FLUSH SLOW LOGS;

或者:

FLUSH LOGS;

而不是直接删除日志。


一键巡检脚本

#!/bin/bashecho"Deleted file check..."lsof -nP | grep deleted | \ awk' { size=$7/1024/1024/1024; printf "%-10s %-8s %10.2f GB\n",$1,$2,size; } ' |sort -k3 -nr
BASH

输出:

java12345120.33GBmysqld223445.20GBoracle889912.50GB
YAML

注意事项

1. 不要直接 kill -9

很多人:

kill -9 PID
BASH

虽然空间能释放:

但可能导致:

  • Oracle 实例恢复
  • MySQL Crash Recovery

风险较高。


2. 优先截断文件

推荐:

echo > /proc/PID/fd/FD
BASH

风险最低。


3. Docker 环境更容易发生

容器日志:

json.log

经常达到几十 GB。

建议定期检查:

lsof | grep deleted

4. 日志轮转优先使用 logrotate

不要:

rm logfile
BASH

推荐:

logrotate

或者应用自带:

reload logs

生产环境使用建议

建议加入监控:

lsof | grep deleted |wc -l
BASH

以及:

lsof | grep deleted | awk'{sum+=$7} END {print sum}'
JAVASCRIPT

统计已删除文件占用空间。

当超过:

10GB

触发告警。

很多“磁盘突然满了”的故障,实际上不是数据增长,而是被删除但仍被进程持有的大文件造成的。

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  1. CONNECT:[ UseTime:0.000619s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000822s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000333s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000278s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000485s ]
  6. SELECT * FROM `set` [ RunTime:0.000196s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000574s ]
  8. SELECT * FROM `article` WHERE `id` = 503439 LIMIT 1 [ RunTime:0.001159s ]
  9. UPDATE `article` SET `lasttime` = 1783182227 WHERE `id` = 503439 [ RunTime:0.016025s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000280s ]
  11. SELECT * FROM `article` WHERE `id` < 503439 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000425s ]
  12. SELECT * FROM `article` WHERE `id` > 503439 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000466s ]
  13. SELECT * FROM `article` WHERE `id` < 503439 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002500s ]
  14. SELECT * FROM `article` WHERE `id` < 503439 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.010406s ]
  15. SELECT * FROM `article` WHERE `id` < 503439 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.019284s ]
0.120135s