在Linux，查看系統對資源使用的顯示可以使用命令ulimit，其中參數-a會列出所有的資源使用限制。[demo@server ~]$ ulimit -a

core file size (blocks, -c) 0

data seg size (kbytes, -d) unlimited

scheduling priority (-e) 0

file size (blocks, -f) unlimited

pending signals (-i) 2055823

max locked memory (kbytes, -l) 64

max memory size (kbytes, -m) unlimited

open files (-n) 65535

pipe size (512 bytes, -p) 8

POSIX message queues (bytes, -q) 819200

real-time priority (-r) 0

stack size (kbytes, -s) 8192

cpu time (seconds, -t) unlimited

max user processes (-u) 4096

virtual memory (kbytes, -v) unlimited

file locks (-x) unlimited

修改系統的資源對用戶的使用限制

資源對用戶的使用限制在/etc/security/limits.conf文件里配置。如下：demo@server:~$ cat /etc/security/limits.conf

# /etc/security/limits.conf

#

#Each line describes a limit for a user in the form:

#

#

#

#Where:

# can be:

# - an user name

# - a group name, with @group syntax

# - the wildcard *, for default entry

# - the wildcard %, can be also used with %group syntax,

# for maxlogin limit

#

# can have the two values:

# - "soft" for enforcing the soft limits # 軟限制，必須必硬限制的值要小

# - "hard" for enforcing hard limits # 硬限制

#

# can be one of the following:

# - core - limits the core file size (KB)

# - data - max data size (KB)

# - fsize - maximum filesize (KB)

# - memlock - max locked-in-memory address space (KB)

# - nofile - max number of open files # 最大打開的文件數(以文件描敘符，file descripter計數)

# - rss - max resident set size (KB)

# - stack - max stack size (KB)

# - cpu - max CPU time (MIN)

# - nproc - max number of processes

# - as - address space limit

# - maxlogins - max number of logins for this user

# - maxsyslogins - max number of logins on the system

# - priority - the priority to run user process with

# - locks - max number of file locks the user can hold

# - sigpending - max number of pending signals

# - msgqueue - max memory used by POSIX message queues (bytes)

# - nice - max nice priority allowed to raise to

# - rtprio - max realtime priority

#

#

#

root soft nofile 200000

root hard nofile 200000

admin hard nofile 65536

admin soft nofile 65536

# End of file

對資源使用限制的配置是針對用戶或者用戶組，每行格式如下：

用戶名/用戶組 類型(硬限制hard、軟限制soft) 選項 值

其中類型的值可以為hard，soft或者“-”，其中“-”相當于同時配置了hard和soft兩行。

注意：退出重新登錄后，配置生效

總結

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