What to do if rm deletion does not release space in Linux

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Release: 2022-05-17 11:22:58
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解决方法:1、利用“lsof | grep deleted”命令,获取已经被删除但是仍被应用程序占用的进程;2、利用kill命令,删除获取的进程即可释放删除的空间,语法为“kill -9 获取到占用被删文件的进程号”。

What to do if rm deletion does not release space in Linux

本教程操作环境:linux7.3系统、Dell G3电脑。

linux中rm删除不释放空间怎么办

因为被删除的文件在删除的时侯还是进程在操作(打开、访问等)的缘故,rm只完成了在磁盘上文件实体的释放,而类似free list结构中相应的文件系统因进程的操作相应的inode并未释放。

解决的方法:这样的问题解决起来也很简单,找到操作的进程,kill掉就可以了,可是找到操作的进程恰恰是本问题的难点和关键。

这样的问题也可以通过重启机器和nmount/mount文件系统这样的方式解决,但这样的方法我是不提倡的,小小的问题就重启机器,小题大做。

过程:

1、找到正在用被删文件的进程 

lsof | grep deleted
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可以获取一个已经被删除但是仍然被应用程序占用的文件列表

用该命令后,我发现占用的文件列表非常多,我们需要将占用已删除文件的进程给一个一个的杀掉

示例如下:

[root@nc-ftp02 data]# lsof -n /data |grep deleted
sh 8757 root 1w REG 202,5 287246420690 12 /data/nohup.out (deleted)
sh 8757 root 2w REG 202,5 287246420690 12 /data/nohup.out (deleted)
rsync 28485 root 1w REG 202,5 287246420690 12 /data/nohup.out (deleted)
rsync 28485 root 2w REG 202,5 287246420690 12 /data/nohup.out (deleted)
ssh 28486 root 2w REG 202,5 287246420690 12 /data/nohup.out (deleted)
ssh 28486 root 6w REG 202,5 287246420690 12 /data/nohup.out (deleted)
[root@nc-ftp02 data]# lsof -n /data |grep deleted|awk '{print $2}'
8757
8757
28674
28674
28675
28675
[root@nc-ftp02 data]# lsof -n /data |grep deleted|awk '{print $2}'|xargs kill -9
[root@nc-ftp02 data]# lsof -n /data |grep deleted
[root@nc-ftp02 data]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/xvda2 99G 4.2G 90G 5% /
tmpfs 3.9G 228K 3.9G 1% /dev/shm
/dev/xvda1 380M 66M 294M 19% /boot
/dev/xvda5 386G 22G 345G 6% /data
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2、kill掉相应的进程空间就释放了

kill -9 PID
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