The method of Linux release the disk space occupied
1、Check with df find / root directory of free space 0
[root@/]#df -h
2、Check each directory found with du occupies very little space，About 3G space somehow lost。
[root@/]# du -m –max-depth=1 |sort -gr
3、Check with lsof after the discovery of reason，There files are deleted，And the process is still alive，Resulting phenomenon also takes up space
[root@/]# lsof |grep delete
According to numbers listed in the process lsof，After these processes kill，Space is released out
