LIMITS(5)

名称
limits - 资源限制描述

描述

The limits file (/etc/limits by default or LIMITS_FILE defined config.h) describes the resource limits you wish to impose. It should be owned by root and readable by root account only.

By default no quota is imposed on 'root'. In fact, there is no way to impose limits via this procedure to root-equiv accounts (accounts with UID 0).

每行以如下格式对一个用户描述限制：

user LIMITS_STRING

或如下格式：

@group LIMITS_STRING

The LIMITS_STRING is a string of a concatenated list of resource limits. Each limit consists of a letter identifier followed by a numerical limit.

可用的指示符有：

    • A：最大地址空间 (KB)

    • C：最大转储文件大小 (KB)

    • D：最大数据大小 (KB)

    • F: maximum file size (KB)

    • K: file creation mask, set by umask(2).

    • I：最高 nice 级别，(0...39 对应 20...-19)

    • L：此用户的最大登录数

    • M: max locked-in-memory address space (KB)

    • N：最大的文件打开数

    • O：最大实时优先级

    • P: process priority, set by setpriority(2).

    • R: max resident set size (KB)

    • S：最大栈尺寸 (KB)

    • T：最大 CPU 时间 (分钟)

    • U：最大处理器数目

For example, L2D2048N5 is a valid LIMITS_STRING. For reading convenience, the following entries are equivalent:

          username L2D2048N5
          username L2 D2048 N5

Be aware that after username the rest of the line is considered a limit string, thus comments are not allowed. An invalid limits string will be rejected (not considered) by the login program.

The default entry is denoted by username "*". If you have multiple default entries in your LIMITS_FILE, then the last one will be used as the default entry.

The limits specified in the form "@group" apply to the members of the specified group.

If more than one line with limits for a user exist, only the first line for this user will be considered.

If no lines are specified for a user, the last @group line matching a group whose the user is a member of will be considered, or the last line with default limits if no groups contain the user.

To completely disable limits for a user, a single dash "-" will do.

To disable a limit for a user, a single dash "-" can be used instead of the numerical value for this limit.

Also, please note that all limit settings are set PER LOGIN. They are not global, nor are they permanent. Perhaps global limits will come, but for now this will have to do ;)

文件

/etc/limits

参见

login(1), setpriority(2), setrlimit(2).