lttng-load(1)
=============
+:revdate: 14 June 2021
NAME
----
-lttng-load - Load LTTng tracing session configurations
+lttng-load - Load LTTng recording session configurations
SYNOPSIS
--------
[verse]
*lttng* ['linkgenoptions:(GENERAL OPTIONS)'] *load* [option:--force] [option:--input-path='PATH']
- [option:--override-url='URL]' ['SESSION']
+ [option:--override-url='URL'] [option:--all | 'SESSION' [option:--override-name='NAME']]
DESCRIPTION
-----------
The `lttng load` command loads the configurations of one or more
-tracing sessions from files.
+recording sessions from files.
-The `lttng load` command is used in conjunction with the
-man: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.
+See man:lttng-concepts(7) to learn more about recording sessions.
-Once one or more tracing session configurations are loaded, they appear
-exactly as they were saved from the user's point of view.
+Use the `load` command in conjunction with the man:lttng-save(1) command
+to save and restore the complete configurations of recording sessions. A
+recording session configuration includes the enabled channels and
+recording event rules, the context fields to be recorded, the recording
+activity, and more.
-The following directories are searched, non-recursively, in this order
-for configuration files:
+Once LTTng loads one or more recording session configurations, they
+appear exactly as they were saved from the user's point of view.
+
+LTTng searches the following directories, non-recursively, in this order
+for recording session configuration files:
. `$LTTNG_HOME/.lttng/sessions` (`$LTTNG_HOME` defaults to `$HOME`)
. +{system_sessions_dir}+
-The input path can be overridden with the option:--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.
+Override the input path with the option:--input-path='PATH' option. With
+this option, LTTng does :not: search the default directories above.
+'PATH' can be the path of one of:
+
+A directory::
+ With the 'SESSION' argument:::
+ LTTng searches for the recording session configuration named
+ 'SESSION' in all the files of the directory 'PATH' and loads it
+ if found.
-If the input path is a *directory*, then:
+ Without the 'SESSION' argument:::
+ The option:--all option is implicit: LTTng loads all the
+ recording session configurations found in all the files in the
+ directory 'PATH'.
-* 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 option:--all option is implicit:
- all the tracing session configurations found in all the files in this
- directory are loaded.
+A file::
+ With the 'SESSION' argument:::
+ LTTng searches for the recording session configuration named
+ 'SESSION' in the file 'PATH' and loads it if found.
-If the input path is a *file*, then:
+ Without the 'SESSION' argument:::
+ The option:--all option is implicit: LTTng loads all the
+ recording session configurations found in the file 'PATH'.
-* 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 option:--all option is implicit:
- all the tracing session configurations found in this file are loaded.
+Override the output URL of the loaded recording session configurations
+with the option:--override-url option.
-Aspects of the loaded configurations can be overridden at load time.
+With the 'SESSION' argument, override the name of the loaded recording
+session configuration with the option:--override-name option.
-option:--override-url::
- Provides the equivalent of the option:--set-url option
- of the (1)lttng-create command. The validity of the url override is
- dependant on the type of session(s) to be loaded. Refer to (1)lttng-create for
- the accepted URL format.
+By default, the `load` command does :not: overwrite existing recording
+sessions: the command fails. Allow the `load` command to overwrite
+existing recording sessions with the option:--force option.
-By default, existing tracing sessions are not overwritten when loading:
-the command fails. The option:--force option can be used to allow this.
+See the ``<<examples,EXAMPLES>>'' section below for usage examples.
-include::common-cmd-options-head.txt[]
+include::common-lttng-cmd-options-head.txt[]
option:-a, option:--all::
- Load all tracing session configurations (default).
+ Load all the recording session configurations (default).
option:-f, option:--force::
- Overwrite existing tracing sessions when loading.
+ Overwrite existing recording sessions when loading.
-option:-i, option:--input-path='PATH'::
- Load tracing session configurations from 'PATH', either a directory
- or a file, instead of loading them from the default search
+option:-i 'PATH', option:--input-path='PATH'::
+ Load recording session configurations from 'PATH', either a
+ directory or a file, instead of loading them from the default search
directories.
-option:-U, option:--override-url='URL'::
- Load tracing session configurations and apply an url override
- while loading. Applies to all sessions loaded.
+option:--override-name='NAME'::
+ Override the name of the loaded recording session configuration,
+ 'SESSION', with 'NAME'.
+
+option:--override-url='URL'::
+ Override the output URL of the loaded recording session
+ configurations with 'URL'.
++
+This is the equivalent of the nloption:--set-url option of
+man:lttng-create(1). The validity of the URL override depends on the
+type of recording session configurations to load. This option applies to
+_all_ the loaded recording session configurations.
+
+
+include::common-lttng-cmd-help-options.txt[]
+
+
+include::common-lttng-cmd-after-options.txt[]
+
+
+[[examples]]
+EXAMPLES
+--------
+.Load all the recording session configurations from the default search directories.
+====
+[role="term"]
+----
+$ lttng load
+----
+====
+
+.Load all the recording session configurations from a specific directory.
+====
+See the option:--input-path option.
-include::common-cmd-help-options.txt[]
+[role="term"]
+----
+$ lttng load --input-path=/path/to/sessions
+----
+====
+
+.Load a specific recording session configuration from the default search directories.
+====
+[role="term"]
+----
+$ lttng load my-session
+----
+====
+
+.Allow LTTng to overwrite existing recording sessions when loading.
+====
+See the option:--force option.
+
+[role="term"]
+----
+$ lttng load --force
+----
+====
+
+.Load a specific recording session configuration from a specific file, overriding its name.
+====
+See the option:--input-path and option:--override-name options.
+
+[role="term"]
+----
+$ lttng load my-session --input-path=/path/to/sessions.lttng \
+ --override-name=new-test
+----
+====
-include::common-cmd-footer.txt[]
+include::common-footer.txt[]
SEE ALSO
--------
+man:lttng(1),
man:lttng-save(1),
-man:lttng(1)
+man:lttng-concepts(7)
projects / lttng-tools.git / blobdiff