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)