lsof command usage: View deleted space but not released process

View deleted files, space has no release, no then kill PID

Lsof-n |grep deleted

Lsof Introduction lsof (list open files) is a tool that lists open files for the current system.

Problem Description:

Service Alarm root partition utilization more than 95%, come up to see 96% utilization rate;

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but/partition below the directory, each query add up also less than 4G space, the more out of the 40G do not know where?

Find query also found no large file;

Analysis Reason:

It may be that the space occupied by the system process is not released, resulting;

Through the command to see the discovery, PHP process a total of 3, are in the deleted state, the file size is just 40G, just is more out of space, to find the problem;

Workaround:

Find the corresponding PHP process number, kill can be;

[[email protected] webserver]# lsof -n / |grep deletedmysqld      2660   mysql    4u   REG     8,2           0  524290 /tmp/ ibsf7sxt  (Deleted) mysqld     2660   mysql     5u   reg    8,2            0  524305 /tmp/ibCCM4u4  (Deleted) mysqld     2660    mysql    6u   REG    8,2            0  524309 /tmp/ibKuAG2E  (Deleted) mysqld      2660   mysql    7u   REG     8,2           0  524315 /tmp/ibcLe4Bf  ( deleted) mysqld     2660   mysql   11u    reg    8,2           0   524316 /tmp/ibw2n1iq  (Deleted) php        7045     root    0r   REG    8,2         1172  524374 /tmp/sh-thd-1494029191  (Deleted) php         7045    root    2w    reg    8,2 42413952626  657428 /var/spool/at/spool/ a0100c017bf37c  (Deleted) php        7054     Root    0r   reg    8,2        1172  524374  /tmp/sh-thd-1494029191  (Deleted) php        7054     root    2w   reg    8,2 42413952626   657428 /var/spool/at/spool/a0100c017bf37c  (Deleted) php        12730    root    0r   REG     8,2        1172  524374 /tmp/sh-thd-1494029191   (Deleted) php       12730    root     2w   reg    8,2 42413952626  657428 /var/ spool/at/spool/a0100c017bf37c  (Deleted) mysqld    17855   mysql     4u   reg    8,2           0   524384 /tmp/ibxBS5jf  (Deleted) mysqld    17855   mysql     5u   REG    8,2            0  524385 /tmp/ibmrNzfL  (Deleted) mysqld     17855   mysql    6u   reg    8,2            0  524386 /tmp/ibVDS3ah  ( deleted) mysqld    17855   mysql    7u    reg    8,2           0   524387 /tmp/ibx6ytrj  (Deleted) mysqld    17855   mysql    13u   REG    8,2           0   524388 /tmp/ibOhb8xQ  (Deleted)

No files found in the corresponding directory

[Email protected] webserver]# ll/var/spool/at/spool/

Total dosage 0

[Email protected] webserver]# kill-9 7045

[Email protected] webserver]# kill-9 7054

[Email protected] webserver]# kill-9 12730

Review the discovery process without PHP again

[Email protected] webserver]# lsof-n/|grep deleted

mysqld 2660 MySQL 4u REG 8,2 0 524290/tmp/ibsf7sxt (deleted)

Mysqld 2660 MySQL 5u REG 8,2 0 524305/tmp/ibccm4u4 (deleted)

Mysqld 2660 MySQL 6u REG 8,2 0 524309/tmp/ibkuag2e (deleted)

Mysqld 2660 MySQL 7u REG 8,2 0 524315/tmp/ibcle4bf (deleted)

Mysqld 2660 MySQL 11u REG 8,2 0 524316/tmp/ibw2n1iq (deleted)

mysqld 17855 MySQL 4u REG 8,2 0 524384/tmp/ibxbs5jf (deleted)

Mysqld 17855 MySQL 5u REG 8,2 0 524385/tmp/ibmrnzfl (deleted)

Mysqld 17855 MySQL 6u REG 8,2 0 524386/tmp/ibvds3ah (deleted)

Mysqld 17855 MySQL 7u REG 8,2 0 524387/tmp/ibx6ytrj (deleted)

Mysqld 17855 MySQL 13u REG 8,2 0 524388/tmp/ibohb8xq (deleted)

View space has been restored:

[[email protected] webtserver]# df-h file system capacity used with available percent mount point/dev/sda2 49G 4.4G 42G 10%/tmpfs 16G 0 16G 0%/dev/shm

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lsof command usage: View deleted space but not released process