[root@localhost ~]# cat /etc/security/limits.conf
# /etc/security/limits.conf
#
#Each line describes a limit for a user in the form:
#
#<domain> <type> <item> <value>
#
#Where:
#<domain> 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
#
#<type> can have the two values:
# - "soft" for enforcing the soft limits
# - "hard" for enforcing hard limits
#
#<item> can be one of the following:
# - core - limits the core file size (KB) ---限制内核文件的大小
# - data - max data size (KB) ---------------最大数据大小
# - fsize - maximum filesize (KB)-------------最大文件大小
# - memlock - max locked-in-memory address space (KB)--最大锁定内存地址空间
# - nofile - max number of open files-----------打开文件的最大数目
# - rss - max resident set size (KB)------------最大持久设置大小
# - stack - max stack size (KB)-----------------最大栈大小
# - cpu - max CPU time (MIN)--------------------最多CPU时间
# - nproc - max number of processes-------------进程的最大数目
# - as - address space limit---------------------地址空间限制
# - maxlogins - max number of logins for this user----此用户允许登录的最大数目
# - maxsyslogins - max number of logins on the system--系统允许登录的最多用户数
# - priority - the priority to run user process with--用户进程的优先级运行
# - locks - max number of file locks the user can hold--用户可以持有的文件锁最大数量
# - sigpending - max number of pending signals---未处理信号的最大数量
# - msgqueue - max memory used by POSIX message queues (bytes)--内存使用最大POSIX消息队列
# - nice - max nice priority allowed to raise to--允许的最大优先级
# - rtprio - max realtime priority----最大实时优先
#
#<domain> <type> <item> <value>
#
#* soft core 0
#* hard rss 10000
#@student hard nproc 20
#@faculty soft nproc 20
#@faculty hard nproc 50
#ftp hard nproc 0
#@student - maxlogins 4
jacky hard maxlogins 3
# End of file
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