230 lines
7.3 KiB
Groff
230 lines
7.3 KiB
Groff
.\" Copyright (c) 2007-2015 The OpenRC Authors.
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.\" See the Authors file at the top-level directory of this distribution and
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.\" https://github.com/OpenRC/openrc/blob/HEAD/AUTHORS
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.\"
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.\" This file is part of OpenRC. It is subject to the license terms in
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.\" the LICENSE file found in the top-level directory of this
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.\" distribution and at https://github.com/OpenRC/openrc/blob/HEAD/LICENSE
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.\" This file may not be copied, modified, propagated, or distributed
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.\" except according to the terms contained in the LICENSE file.
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.\"
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.Dd December 14, 2009
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.Dt START-STOP-DAEMON 8 SMM
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.Os OpenRC
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.Sh NAME
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.Nm start-stop-daemon
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.Nd ensures that daemons start and stop
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.Sh SYNOPSIS
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.Nm
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.Fl S , -start
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.Ar daemon
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.Op Fl -
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.Op Ar arguments
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.Nm
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.Fl K , -stop
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.Ar daemon
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.Nm
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.Fl s , -signal
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.Ar signal
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.Ar daemon
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.Sh DESCRIPTION
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.Nm
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provides a consistent method of starting, stopping and signaling daemons.
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If neither
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.Fl K , -stop
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nor
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.Fl s , -signal
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are provided, then we assume we are starting the daemon.
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If a daemon cannot background by itself, nor create a pidfile,
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.Nm
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can do it for the daemon in a secure fashion.
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.Pp
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If
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.Nm
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is used in an OpenRC service, then OpenRC can in turn check to see if the
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daemon is still running. If not, then the service is marked as crashed.
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.Pp
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Here are the options to specify the daemon and how it should start or stop:
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.Bl -tag -width indent
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.It Fl x , -exec Ar daemon
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The
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.Ar daemon
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we start or stop.
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If this option is not specified, then the first non option argument
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is used.
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.It Fl p , -pidfile Ar pidfile
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When starting, we expect the daemon to create a valid
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.Ar pidfile
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within a reasonable amount of time. When stopping we only stop the first pid
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listed in the
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.Ar pidfile .
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.It Fl n , -name Ar name
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Match the process
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.Ar name
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instead of a pidfile or executable.
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.It Fl i , -interpreted
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When matching process name, we should ensure that the correct interpreter
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is also matched.
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So if the daemon foo starts off like so
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.D1 #!/usr/bin/perl -w
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then
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.Nm
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matches the process
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.D1 /usr/bin/perl -w foo
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If an interpreted daemon changes its process name then this won't work.
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.It Fl u , -user Ar user Ns Op : Ns Ar group
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Start the daemon as the
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.Ar user
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and update $HOME accordingly or stop daemons
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owned by the user. You can optionally append a
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.Ar group
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name here also.
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.It Fl t , -test
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Print the action(s) that would be taken, but don't actually do anything.
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The return value is set as if the command was taken and worked.
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.It Fl v , -verbose
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Print the action(s) that are taken just before doing them.
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.It Fl P , -progress
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Echo a . to the console for each second elapsed whilst waiting.
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.El
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.Pp
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These options are only used for starting daemons:
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.Bl -tag -width indent
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.It Fl a , -startas Ar name
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Change the process name of the daemon to
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.Ar name .
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This just changes the first argument passed to the daemon.
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.It Fl b , -background
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Force the daemon into the background. Some daemons don't create pidfiles, so a
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good trick is to get the daemon to run in the foreground, and use the this
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option along with
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.Fl m , -make-pidfile
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to create a working pidfile.
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.It Fl d , -chdir Ar path
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chdir to this directory before starting the daemon.
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.It Fl r , -chroot Ar path
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chroot to this directory before starting the daemon. All other paths, such
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as the path to the daemon, chdir and pidfile, should be relative to the chroot.
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.It Fl c , -chuid Ar user
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Same as the
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.Fl u , -user
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option.
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.It Fl e , -env Ar VAR=VALUE
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Set the environment variable VAR to VALUE.
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.It Fl g , -group Ar group
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Start the daemon as in the group.
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.It Fl k , -umask Ar mode
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Set the umask of the daemon.
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.It Fl m , -make-pidfile
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Saves the pid of the daemon in the file specified by the
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.Fl p , -pidfile
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option. Only useful when used with daemons that run in the foreground and
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forced into the background with the
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.Fl b , -background
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option.
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.It Fl I , -ionice Ar class Ns Op : Ns Ar data
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Modifies the IO scheduling priority of the daemon.
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Class can be 0 for none, 1 for real time, 2 for best effort and 3 for idle.
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Data can be from 0 to 7 inclusive.
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.It Fl N , -nicelevel Ar level
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Modifies the scheduling priority of the daemon.
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.It Fl -oom-score-adj Ar adj
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Modifies the OOM score adjustment of the daemon.
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.It Fl 1 , -stdout Ar logfile
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Redirect the standard output of the process to logfile when started with
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.Fl background .
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The logfile Must be an absolute pathname, but relative to the path
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optionally given with
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.Fl r , -chroot .
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The logfile can also be a named pipe.
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.It Fl 2 , -stderr Ar logfile
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Redirect the standard error of the process to logfile when started with
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.Fl background .
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The logfile must be an absolute pathname, but relative to the path
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optionally given with
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.Fl r , -chroot .
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The logfile can also be a named pipe.
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.It Fl 3 , -stdout-logger Ar cmd
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Run cmd as a child process redirecting the standard output to the
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standard input of cmd when started with
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.Fl background .
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Cmd must be an absolute pathname, but relative to the path optionally given with
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.Fl r , -chroot .
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This process must be prepared to accept input on stdin and be able to
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log it or send it to another location.
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.It Fl 4 , -stderr-logger Ar cmd
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Run cmd as a child process and
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Redirect the standard error of the process to the standard input of cmd
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when started with
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.Fl background .
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Cmd must be an absolute pathname, but relative to the path optionally given with
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.Fl r , -chroot .
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This process must be prepared to accept input on stdin and be able to
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log it or send it to another location.
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.It Fl -capabilities Ar cap-list
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Start the daemon with the listed inheritable, ambient and bounding capabilities.
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The format is the same as in cap_iab(3).
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.It Fl w , -wait Ar milliseconds
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Wait
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.Ar milliseconds
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after starting and check that daemon is still running.
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Useful for daemons that check configuration after forking or stopping race
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conditions where the pidfile is written out after forking.
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.It Fl 2 , -stderr Ar logfile
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The same thing as
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.Fl 1 , -stdout
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but with the standard error output.
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.El
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.Pp
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These options are only used for stopping daemons:
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.Bl -tag -width indent
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.It Fl R , -retry Ar timeout | Ar signal Ns / Ns Ar timeout
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The retry specification can be either a timeout in seconds or multiple
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signal/timeout pairs (like SIGTERM/5).
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If this option is not given, the default is SIGTERM/5.
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.El
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.Sh ENVIRONMENT
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.Va SSD_IONICELEVEL
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can also set the IO scheduling priority of the daemon, but the command line
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option takes precedence.
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.Pp
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.Va SSD_NICELEVEL
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can also set the scheduling priority of the daemon, but the command line
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option takes precedence.
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.Pp
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.Va SSD_OOM_SCORE_ADJ
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can also set the OOM score adjustment of the daemon, but the command line
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option takes precedence.
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.Pp
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.Va SSD_STARTWAIT
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As the
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.Fl w , -wait option above.
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.Pa /etc/rc.conf
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.Nm
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waits for to check the daemon is still running.
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.Sh NOTE
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.Nm
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uses
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.Xr getopt 3
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to parse its options, which allows it to accept the `--' option which will
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cause it to stop processing options at that point. Any subsequent arguments
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are passed as arguments to the daemon to start and used when finding a daemon
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to stop or signal.
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.Sh SEE ALSO
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.Xr chdir 2 ,
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.Xr chroot 2 ,
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.Xr getopt 3 ,
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.Xr nice 2 ,
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.Xr rc_find_pids 3
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.Sh BUGS
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.Nm
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cannot stop an interpreted daemon that no longer exists without a pidfile.
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.Sh HISTORY
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.Nm
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first appeared in Debian.
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.Pp
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This is a complete re-implementation with the process finding code in the
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OpenRC library (librc, -lrc) so other programs can make use of it.
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.Sh AUTHORS
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.An Roy Marples <roy@marples.name>
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