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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | ENVIRONMENT VARIABLES | FILES | EXIT STATUS | BUGS | RESOURCES | COPYRIGHTS | THANKS | AUTHORS | SEE ALSO | COLOPHON |
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LTTNG-LOAD(1) LTTng Manual LTTNG-LOAD(1)
lttng-load - Load LTTng tracing session configurations
lttng [GENERAL OPTIONS] load [--force] [--input-path=PATH]
[--override-url=URL] [SESSION [--override-name=NAME]]
The lttng load command loads the configurations of one or more
tracing sessions from files.
The lttng load command is used in conjunction with the
lttng-save(1) command to save and restore the complete
configurations of tracing sessions. This includes the enabled
channels and event rules, the context added to channels, the
tracing activity, and more.
Once one or more tracing session configurations are loaded, they
appear exactly as they were saved from the user’s point of view.
The following directories are searched, non-recursively, in this
order for configuration files:
1. $LTTNG_HOME/.lttng/sessions ($LTTNG_HOME defaults to $HOME)
2. /usr/local/etc/lttng/sessions
The input path can be overridden with the --input-path option.
When this option is specified, the default directories are NOT
searched for configuration files. When it’s not specified, both
default directories are searched for configuration files.
If the input path is a directory, then:
• If SESSION is specified, the tracing session configuration
named SESSION is searched for in all the files of this
directory and loaded if found.
• If SESSION is not specified, the --all option is implicit:
all the tracing session configurations found in all the files
in this directory are loaded.
If the input path is a file, then:
• If SESSION is specified, the tracing session configuration
named SESSION is searched for in this file and loaded if
found.
• If SESSION is not specified, the --all option is implicit:
all the tracing session configurations found in this file are
loaded.
Aspects of the loaded configurations can be overridden at load
time using the --override-url and --override-name options.
By default, existing tracing sessions are not overwritten when
loading: the command fails. The --force option can be used to
allow this.
General options are described in lttng(1).
-a, --all
Load all tracing session configurations (default).
-f, --force
Overwrite existing tracing sessions when loading.
-i PATH, --input-path=PATH
Load tracing session configurations from PATH, either a
directory or a file, instead of loading them from the default
search directories.
--override-name=NAME
Override the name of the loaded tracing session
configuration, SESSION, with NAME.
You must specify a tracing session name to load (SESSION) and
NOT use the --all option when using this option.
--override-url=URL
Override the URL of the loaded tracing session configurations
with URL.
This is the equivalent of the --set-url option of
lttng-create(1). The validity of the URL override depends on
the type of tracing session configurations to load. This
option applies to all the loaded tracing session
configurations.
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-options
List available command options.
LTTNG_ABORT_ON_ERROR
Set to 1 to abort the process after the first error is
encountered.
LTTNG_HOME
Overrides the $HOME environment variable. Useful when the
user running the commands has a non-writable home directory.
LTTNG_MAN_BIN_PATH
Absolute path to the man pager to use for viewing help
information about LTTng commands (using lttng-help(1) or
lttng COMMAND --help).
LTTNG_SESSION_CONFIG_XSD_PATH
Path in which the session.xsd session configuration XML
schema may be found.
LTTNG_SESSIOND_PATH
Full session daemon binary path.
The --sessiond-path option has precedence over this
environment variable.
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 daemon.
$LTTNG_HOME/.lttngrc
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.
$LTTNG_HOME/lttng-traces
Default output directory of LTTng traces. This can be
overridden with the --output option of the lttng-create(1)
command.
$LTTNG_HOME/.lttng
User LTTng runtime and configuration directory.
$LTTNG_HOME/.lttng/sessions
Default location of saved user tracing sessions (see
lttng-save(1) and lttng-load(1)).
/usr/local/etc/lttng/sessions
System-wide location of saved tracing sessions (see
lttng-save(1) and lttng-load(1)).
Note
$LTTNG_HOME defaults to $HOME when not explicitly set.
0
Success
1
Command error
2
Undefined command
3
Fatal error
4
Command warning (something went wrong during the command)
If you encounter any issue or usability problem, please report it
on the LTTng bug tracker <https://bugs.lttng.org/projects/lttng-
tools>.
• LTTng project website <https://lttng.org>
• LTTng documentation <https://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: [email protected]
• IRC channel <irc://irc.oftc.net/lttng>: #lttng on
irc.oftc.net
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.
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.
LTTng-tools was originally written by Mathieu Desnoyers, Julien
Desfossez, and David Goulet. More people have since contributed
to it.
LTTng-tools is currently maintained by Jérémie Galarneau
<mailto:[email protected]>.
lttng-save(1), lttng(1)
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 [email protected].
This page was obtained from the project's upstream Git repository
⟨git://git.lttng.org/lttng-tools.git⟩ on 2019-11-19. (At that
time, the date of the most recent commit that was found in the
repository was 2019-11-14.) 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
[email protected]
LTTng 2.12.0-pre 10/29/2018 LTTNG-LOAD(1)
Pages that refer to this page: lttng(1), lttng-add-context(1), lttng-calibrate(1), lttng-create(1), lttng-destroy(1), lttng-disable-channel(1), lttng-disable-event(1), lttng-disable-rotation(1), lttng-enable-channel(1), lttng-enable-event(1), lttng-enable-rotation(1), lttng-help(1), lttng-list(1), lttng-load(1), lttng-metadata(1), lttng-regenerate(1), lttng-rotate(1), lttng-save(1), lttng-set-session(1), lttng-snapshot(1), lttng-start(1), lttng-status(1), lttng-stop(1), lttng-track(1), lttng-untrack(1), lttng-version(1), lttng-view(1), lttng-sessiond(8)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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