200 lines
6.3 KiB
Groff
200 lines
6.3 KiB
Groff
.\"-
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.\" Copyright (c) 2009 Edward Tomasz Napierala
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR THE VOICES IN HIS HEAD BE
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.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd October 26, 2012
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.Dt RCTL 8
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.Os
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.Sh NAME
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.Nm rctl
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.Nd display and update resource limits database
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.Sh SYNOPSIS
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.Nm
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.Op Fl h
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.Op Fl n
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.Op Ar filter
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.Nm
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.Fl a
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.Op Ar rule
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.Nm
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.Op Fl h
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.Op Fl n
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.Fl l
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.Op Ar filter
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.Nm
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.Fl r
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.Op Ar filter
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.Nm
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.Op Fl h
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.Fl u
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.Op Ar filter
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.Sh DESCRIPTION
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When called without options, the
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.Nm
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command writes currently defined RCTL rules to standard output.
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.Pp
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If a
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.Ar filter
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argument is specified, only rules matching the filter are displayed.
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The options are as follows:
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.Bl -tag -width indent
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.It Fl a Ar rule
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Add
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.Ar rule
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to the RCTL database.
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.It Fl l Ar filter
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Display rules applicable to the process defined by
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.Ar filter .
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Note that this is different from showing the rules when called without
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any options, as it shows not just the rules with subject equal to that
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of process, but also rules for the user, jail, and login class applicable
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to the process.
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.It Fl r Ar filter
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Remove rules matching
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.Ar filter
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from the RCTL database.
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.It Fl u Ar filter
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Display resource usage for a subject (process, user, login class
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or jail) matching the
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.Ar filter .
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.It Fl h
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"Human-readable" output.
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Use unit suffixes: Byte, Kilobyte, Megabyte,
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Gigabyte, Terabyte and Petabyte.
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.It Fl n
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Display user IDs numerically rather than converting them to a user name.
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.El
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.Sh RULE SYNTAX
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Syntax for a rule is subject:subject-id:resource:action=amount/per.
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.Pp
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Subject defines the kind of entity the rule applies to.
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It can be either process, user, login class, or jail.
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.Pp
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Subject ID identifies the subject.
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It can be a process ID, user name, numerical user ID, login class name,
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or jail name.
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.Pp
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Resource identifies the resource the rule controls.
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.Pp
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Action defines what will happen when a process exceeds the allowed amount.
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.Pp
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Amount defines how much of the resource a process can use before
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the defined action triggers.
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.Pp
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The per field defines what entity the amount gets accounted for.
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For example, rule "loginclass:users:vmem:deny=100M/process" means
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that each process of any user belonging to login class "users" may allocate
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up to 100MB of virtual memory.
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Rule "loginclass:users:vmem:deny=100M/user" would mean that for each
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user belonging to the login class "users", the sum of virtual memory allocated
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by all the processes of that user will not exceed 100MB.
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Rule "loginclass:users:vmem:deny=100M/loginclass" would mean that the sum of
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virtual memory allocated by all processes of all users belonging to that login
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class will not exceed 100MB.
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.Pp
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Valid rule has all those fields specified, except for the per, which defaults
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to the value of subject.
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.Pp
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A filter is a rule for which one of more fields other than per is left empty.
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For example, a filter that matches every rule could be written as ":::=/",
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or, in short, ":".
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A filter that matches all the login classes would be "loginclass:".
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A filter that matches all defined rules for maxproc resource would be
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"::maxproc".
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.Sh RESOURCES
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.Bl -column -offset 3n "pseudoterminals"
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.It cputime Ta "CPU time, in seconds"
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.It datasize Ta "data size, in bytes"
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.It stacksize Ta "stack size, in bytes"
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.It coredumpsize Ta "core dump size, in bytes"
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.It memoryuse Ta "resident set size, in bytes"
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.It memorylocked Ta "locked memory, in bytes"
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.It maxproc Ta "number of processes"
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.It openfiles Ta "file descriptor table size"
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.It vmemoryuse Ta "address space limit, in bytes"
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.It pseudoterminals Ta "number of PTYs"
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.It swapuse Ta "swap usage, in bytes"
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.It nthr Ta "number of threads"
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.It msgqqueued Ta "number of queued SysV messages"
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.It msgqsize Ta "SysV message queue size, in bytes"
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.It nmsgq Ta "number of SysV message queues"
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.It nsem Ta "number of SysV semaphores"
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.It nsemop Ta "number of SysV semaphores modified in a single semop(2) call"
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.It nshm Ta "number of SysV shared memory segments"
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.It shmsize Ta "SysV shared memory size, in bytes"
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.It wallclock Ta "wallclock time, in seconds"
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.It pcpu Ta "%CPU, in percents of a single CPU core"
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.El
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.Sh ACTIONS
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.Bl -column -offset 3n "pseudoterminals"
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.It deny Ta "deny the allocation; not supported for cpu and wallclock"
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.It log Ta "log a warning to the console"
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.It devctl Ta "send notification to"
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.Xr devd 8
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.It "sig* e.g. sigterm; send a signal to the offending process"
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.El
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.Pp
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See
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.Xr signal 3
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for a list of supported signals.
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.Pp
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Not all actions are supported for all resources.
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Attempt to add rule with action not supported by a given resouce will result
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in error.
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.Pp
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Note that limiting RSS may kill the machine due to thrashing.
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.Sh EXIT STATUS
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.Ex -std
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.Sh EXAMPLES
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.Dl rctl -a user:joe:vmemoryuse:deny=1g
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.Pp
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Prevent user "joe" from allocating more than 1GB of virtual memory.
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.Pp
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.Dl rctl -r :
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.Pp
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Remove all RCTL rules.
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.Pp
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.Dl rctl -hu jail:www
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.Pp
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Display resource usage information for jail named "www".
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.Pp
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.Dl rctl -l process:512
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.Pp
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Display all the rules applicable to process with PID 512.
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.Sh SEE ALSO
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.Xr rctl.conf 5
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Fx 9.0 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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command was written by
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.An Edward Tomasz Napierala Aq trasz@FreeBSD.org .
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