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lttng-start(1)
==============
:revdate: 1 April 2025
NAME
----
lttng-start - Start one or more LTTng recording session
SYNOPSIS
--------
[verse]
*lttng* ['linkgenoptions:(GENERAL OPTIONS)'] *start* [option:--all | option:--glob='PATTERN' | 'SESSION']
DESCRIPTION
-----------
The `lttng start` command starts one or more recording sessions, that
is, it activates the LTTng tracers for:
With the 'SESSION' argument::
The recording session named 'SESSION'.
With the option:--glob='PATTERN' option::
The recording sessions of which the globbing pattern
'PATTERN' matches the name.
With the option:--all option::
*All* the recording sessions of the connected session daemon for
your Unix user, or for all users if your Unix user is `root`, as
listed in the output of `lttng list` (see man:lttng-list(1)).
+
See the ``Session daemon connection'' section of man:lttng(1) to learn
how a user application connects to a session daemon.
Otherwise::
The current recording session.
+
See man:lttng-concepts(7) to learn more about
the current recording session.
See man:lttng-concepts(7) to learn more about recording sessions.
The selected recording session(s) must be inactive (stopped). A
recording session is inactive on creation (see man:lttng-create(1)).
A `start-session` trigger action can also start a recording session
(see man:lttng-add-trigger(1)).
See the ``<<examples,EXAMPLES>>'' section below for usage examples.
Stop one or more active recording sessions with the
man:lttng-stop(1) command.
include::common-lttng-cmd-options-head.txt[]
include::common-lttng-cmd-help-options.txt[]
option:-a, option:--all::
Start all the recording sessions of your Unix user, or of all
users if your Unix user is `root`, as listed in the output of
man:lttng-list(1).
option:-g 'PATTERN', option:--glob='PATTERN'::
Start the recording sessions of which the
globbing pattern 'PATTERN' matches the name.
+
In 'PATTERN', the `*` character means ``match anything''. To match
a literal `*` character, use :escwc:.
include::common-lttng-cmd-after-options.txt[]
[[examples]]
EXAMPLES
--------
.Start the current recording session.
====
[role="term"]
----
$ lttng start
----
====
.Start a specific recording session.
====
[role="term"]
----
$ lttng start my-session
----
====
.Start all the recording sessions.
====
See the option:--all option.
[role="term"]
----
$ lttng start --all
----
====
.Start all the recording sessions of which the name ends with `foo`.
====
See the option:--glob option.
[role="term"]
----
$ lttng start --glob='*foo'
----
====
include::common-footer.txt[]
SEE ALSO
--------
man:lttng(1),
man:lttng-add-trigger(1),
man:lttng-create(1),
man:lttng-enable-event(1),
man:lttng-stop(1),
man:lttng-concepts(7)
|
