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LTTNG-START(1)                  LTTng Manual                  LTTNG-START(1)

NAME         top

       lttng-start - Start LTTng tracers

SYNOPSIS         top

       lttng [GENERAL OPTIONS] start [SESSION]

DESCRIPTION         top

       The lttng start command starts the various LTTng tracers for a given
       inactive tracing session.
       Starting the LTTng tracers has the effect that all enabled event
       rules within enabled channels can make their target event sources
       emit trace events. Whether they are recorded to the local file
       system, sent over the network, or not recorded at all depends on the
       specific configuration of the tracing session in which tracing is
       started. See lttng-create(1) for different session modes.
       A tracing session with running tracers is said to be active. Active
       tracing sessions can return to the inactive state using the
       lttng-stop(1) command.
       If SESSION is omitted, the LTTng tracers are started for the current
       tracing session (see lttng-create(1) for more information about the
       current tracing session). Otherwise, they are started for the
       existing tracing session named SESSION. lttng list outputs all the
       existing tracing sessions (see lttng-list(1)).

OPTIONS         top

       General options are described in lttng(1).
   Program information
       -h, --help
           Show command help.
           This option, like lttng-help(1), attempts to launch /usr/bin/man
           to view the command’s man page. The path to the man pager can be
           overridden by the LTTNG_MAN_BIN_PATH environment variable.
           List available command options.


           Set to 1 to abort the process after the first error is
           Overrides the $HOME environment variable. Useful when the user
           running the commands has a non-writable home directory.
           Absolute path to the man pager to use for viewing help
           information about LTTng commands (using lttng-help(1) or lttng
           COMMAND --help).
           Path in which the session.xsd session configuration XML schema
           may be found.
           Full session daemon binary path.
           The --sessiond-path option has precedence over this environment
       Note that the lttng-create(1) command can spawn an LTTng session
       daemon automatically if none is running. See lttng-sessiond(8) for
       the environment variables influencing the execution of the session

FILES         top

           User LTTng runtime configuration.
           This is where the per-user current tracing session is stored
           between executions of lttng(1). The current tracing session can
           be set with lttng-set-session(1). See lttng-create(1) for more
           information about tracing sessions.
           Default output directory of LTTng traces. This can be overridden
           with the --output option of the lttng-create(1) command.
           User LTTng runtime and configuration directory.
           Default location of saved user tracing sessions (see
           lttng-save(1) and lttng-load(1)).
           System-wide location of saved tracing sessions (see lttng-save(1)
           and lttng-load(1)).
           $LTTNG_HOME defaults to $HOME when not explicitly set.

EXIT STATUS         top

           Command error
           Undefined command
           Fatal error
           Command warning (something went wrong during the command)

BUGS         top

       If you encounter any issue or usability problem, please report it on
       the LTTng bug tracker <https://bugs.lttng.org/projects/lttng-tools>.

RESOURCES         top

       ·   LTTng project website <http://lttng.org>
       ·   LTTng documentation <http://lttng.org/docs>
       ·   Git repositories <http://git.lttng.org>
       ·   GitHub organization <http://github.com/lttng>
       ·   Continuous integration <http://ci.lttng.org/>
       ·   Mailing list <http://lists.lttng.org> for support and
           development: lttng-dev@lists.lttng.org
       ·   IRC channel <irc://irc.oftc.net/lttng>: #lttng on irc.oftc.net

COPYRIGHTS         top

       This program is part of the LTTng-tools project.
       LTTng-tools is distributed under the GNU General Public License
       version 2 <http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html>.
       See the LICENSE <https://github.com/lttng/lttng-
       tools/blob/master/LICENSE> file for details.

THANKS         top

       Special thanks to Michel Dagenais and the DORSAL laboratory
       <http://www.dorsal.polymtl.ca/> at École Polytechnique de Montréal
       for the LTTng journey.
       Also thanks to the Ericsson teams working on tracing which helped us
       greatly with detailed bug reports and unusual test cases.

AUTHORS         top

       LTTng-tools was originally written by Mathieu Desnoyers, Julien
       Desfossez, and David Goulet. More people have since contributed to
       LTTng-tools is currently maintained by Jérémie Galarneau

SEE ALSO         top

       lttng-stop(1), lttng(1)

COLOPHON         top

       This page is part of the LTTng-Tools (    LTTng tools) project.
       Information about the project can be found at ⟨http://lttng.org/⟩.
       It is not known how to report bugs for this man page; if you know,
       please send a mail to man-pages@man7.org.  This page was obtained
       from the project's upstream Git repository 
       ⟨git://git.lttng.org/lttng-tools.git⟩ on 2017-07-05.  If you discover
       any rendering problems in this HTML version of the page, or you
       believe there is a better or more up-to-date source for the page, or
       you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a mail
       to man-pages@man7.org
LTTng 2.10.0-pre                 05/03/2017                   LTTNG-START(1)

Pages that refer to this page: lttng(1)lttng-disable-event(1)lttng-enable-event(1)lttng-snapshot(1)lttng-stop(1)