7fcbecd004
Reviewed by: mav, allanjude, bcr (man pages) MFC after: 2 weeks Sponsored by: Klara Inc. Differential Revision: https://reviews.freebsd.org/D23792
135 lines
4.1 KiB
Groff
135 lines
4.1 KiB
Groff
.\" Copyright (c) 2012 The FreeBSD Foundation
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.\" All rights reserved.
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.\"
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.\" This software was developed by Edward Tomasz Napierala under sponsorship
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.\" from the FreeBSD Foundation.
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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 AUTHORS 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 AUTHORS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd March 31, 2020
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.Dt CTLD 8
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.Os
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.Sh NAME
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.Nm ctld
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.Nd CAM Target Layer / iSCSI target daemon
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.Sh SYNOPSIS
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.Nm
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.Op Fl d
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.Op Fl f Ar config-file
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.Op Fl u
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.Nm
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.Fl t
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.Op Fl f Ar config-file
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.Op Fl u
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.Sh DESCRIPTION
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The
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.Nm
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daemon is responsible for managing the CAM Target Layer configuration,
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accepting incoming iSCSI connections, performing authentication and
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passing connections to the kernel part of the native iSCSI target.
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.Pp
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Upon startup, the
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.Nm
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daemon parses the configuration file.
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If it encounters any errors,
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.Nm
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exits.
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It then compares the configuration with the kernel list of LUNs managed
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by previously running
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.Nm
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instances, removes LUNs no longer existing in the configuration file,
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and creates new LUNs as necessary.
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After that it listens for the incoming iSCSI connections, performs
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authentication, and, if successful, passes the connections to the kernel part
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of CTL iSCSI target,
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.Xr cfiscsi 4 ,
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which handles it from that point.
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.Pp
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When it receives a SIGHUP signal, the
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.Nm
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reloads its configuration and applies the changes to the kernel.
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Changes are applied in a way that avoids unnecessary disruptions;
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for example removing one LUN does not affect other LUNs.
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.Pp
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When exiting gracefully, the
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.Nm
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daemon removes LUNs it managed and forcibly disconnects all the clients.
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Otherwise - for example, when killed with SIGKILL - LUNs stay configured
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and clients remain connected.
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.Pp
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To perform administrative actions that apply to already connected
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sessions, such as forcing termination, use
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.Xr ctladm 8 .
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.Pp
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The following options are available:
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.Bl -tag -width ".Fl P Ar pidfile"
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.It Fl f Ar config-file
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Specifies the name of the configuration file.
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The default is
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.Pa /etc/ctl.conf .
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.It Fl d
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Debug mode.
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The daemon sends verbose debug output to standard error, and does not
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put itself in the background.
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The daemon will also not fork and will exit after processing one connection.
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This option is only intended for debugging the target.
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.It Fl t
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Test the configuration file for validity and exit.
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.It Fl u
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Use UCL configuration file format instead of the traditional non-UCL format.
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.El
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.Sh FILES
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.Bl -tag -width ".Pa /var/run/ctld.pid" -compact
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.It Pa /etc/ctl.conf
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The configuration file for
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.Nm .
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The file format and configuration options are described in
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.Xr ctl.conf 5 .
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.It Pa /var/run/ctld.pid
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The default location of the
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.Nm
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PID file.
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.El
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.Sh EXIT STATUS
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The
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.Nm
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utility exits 0 on success, and >0 if an error occurs.
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.Sh SEE ALSO
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.Xr cfiscsi 4 ,
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.Xr ctl 4 ,
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.Xr ctl.conf 5 ,
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.Xr ctladm 8 ,
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.Xr ctlstat 8
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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 10.0 .
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.Sh AUTHORS
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The
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.Nm
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was developed by
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.An Edward Tomasz Napierala Aq Mt trasz@FreeBSD.org
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under sponsorship from the FreeBSD Foundation.
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