Oracle在Linux平台安装时涉及的/etc/security/limits.conf

在Linux平台上安装Oracle数据库时，会涉及到一个资源限制的问题，与之相关的是一个/etc/security/limits.conf文件。用Linux命令man limits.conf可获得关于这个文件的具体信息。

LIMITS.CONF(5) Linux-PAM Manual LIMITS.CONF(5)

NAME
limits.conf - configuration file for the pam_limits module

DESCRIPTION
       The pam_limits.so module applies ulimit limits, nice priority and
       number of simultaneous login sessions limit to user login sessions.
       This description of the configuration file syntax applies to the
       /etc/security/limits.conf file and *.conf files in the
       /etc/security/limits.d directory.

The syntax of the lines is as follows:

The fields listed above should be filled as follows:

· a username

· a groupname, with @group syntax. This should not be confused
with netgroups.

· the wildcard *, for default entry.

·   the wildcard %, for maxlogins limit only, can also be used with
               %group syntax. If the % wildcard is used alone it is identical
               to using * with maxsyslogins limit. With a group specified
               after % it limits the total number of logins of all users that
               are member of the group.

· an uid range specified as <min_uid>:<max_uid>. If min_uid is
omitted, the match is exact for the max_uid. If max_uid is

·   a gid range specified as @<min_gid>:<max_gid>. If min_gid is
               omitted, the match is exact for the max_gid. If max_gid is
               omitted, all gids greater than or equal min_gid match. For the
               exact match all groups including the user´s supplementary
               groups are examined. For the range matches only the user´s
               primary group is examined.

·   a gid specified as %:<gid> applicable to maxlogins limit only.
               It limits the total number of logins of all users that are
               member of the group with the specified gid.

<type>

hard
               for enforcing hard resource limits. These limits are set by the
               superuser and enforced by the Kernel. The user cannot raise his
               requirement of system resources above such values.

soft
               for enforcing soft resource limits. These limits are ones that
               the user can move up or down within the permitted range by any
               pre-existing hard limits. The values specified with this token
               can be thought of as default values, for normal system usage.

-
for enforcing both soft and hard resource limits together.

Note, if you specify a type of ´-´ but neglect to supply the
item and value fields then the module will never enforce any
limits on the specified user/group etc. .

<item>

core
limits the core file size (KB)

data
maximum data size (KB)

fsize
maximum filesize (KB)

memlock
maximum locked-in-memory address space (KB)

nofile
maximum number of open files

rss
maximum resident set size (KB) (Ignored in Linux 2.4.30 and
higher)

stack
maximum stack size (KB)

cpu
maximum CPU time (minutes)

nproc
maximum number of processes

as
address space limit (KB)

maxlogins
maximum number of logins for this user except for this with

priority
the priority to run user process with (negative values boost
process priority)

locks
maximum locked files (Linux 2.4 and higher)

sigpending
maximum number of pending signals (Linux 2.6 and higher)

msgqueue
maximum memory used by POSIX message queues (bytes) (Linux 2.6
and higher)

nice
maximum nice priority allowed to raise to (Linux 2.6.12 and
higher) values: [-20,19]

rtprio
maximum realtime priority allowed for non-privileged processes
(Linux 2.6.12 and higher)

All items support the values -1, unlimited or infinity indicating no
limit, except for priority and nice.

If a hard limit or soft limit of a resource is set to a valid value,
       but outside of the supported range of the local system, the system may
       reject the new limit or unexpected behavior may occur. If the control
       value required is used, the module will reject the login if a limit
       could not be set.

In general, individual limits have priority over group limits, so if
       you impose no limits for admin group, but one of the members in this
       group have a limits line, the user will have its limits set according
       to this line.

Also, please note that all limit settings are set per login. They are
not global, nor are they permanent; existing only for the duration of
the session.

In the limits configuration file, the ´#´ character introduces a
comment - after which the rest of the line is ignored.

The pam_limits module does report configuration problems found in its
configuration file and errors via syslog(3).

EXAMPLES
These are some example lines which might be specified in
/etc/security/limits.conf.

*                      soft        core          0
           *                  hard      nofile            512
           @student        hard      nproc            20
           @faculty         soft      nproc            20
           @faculty         hard       nproc           50
           ftp                   hard       nproc          0
           @student        -         maxlogins        4
           :123                hard       cpu             5000
           @500:            soft        cpu             10000
           600:700          hard      locks           10

AUTHOR
pam_limits was initially written by Cristian Gafton <gafton@redhat.com>

这个Linux手册里详细描述了limits.conf的所有参数意义和具体用法，之所以不翻译出来，是因为作为一名IT从业人员，必须要能阅读基本的英文文档。

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Oracle在Linux平台安装时涉及的/etc/security/limits.conf

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