lttng-destroy — Destroy LTTng recording sessions
lttng destroy command destroys:
The recording session named
All the recording sessions of the connected session daemon for
your Unix user, or for all users if your Unix user is
listed in the output of
lttng list (see lttng-list(1)).
See the “Session daemon connection” section of lttng(1) to learn how a user application connects to a session daemon.
The current recording session (see lttng-concepts(7) to learn more about the current recording session).
In that case, the current recording session becomes nonexistent.
See lttng-concepts(7) to learn more about recording sessions.
“Destroying” a recording session means freeing the resources which the LTTng daemons and tracers acquired for it, also making sure to flush all the recorded trace data to either the local file system or the connected LTTng relay daemon (see lttng-relayd(8)), depending on the recording session mode.
destroy command stops any recording activity within the selected
recording session(s). By default, the command runs an implicit
lttng-stop(1) command to ensure that the trace data of the recording
session(s) is valid before it exits. Make the command exit immediately
--no-wait option. In this case, however, the traces(s)
might not be valid when the command exits, and there’s no way to know
when it/they become valid.
If, for a recording session
RS to destroy with the
command, the following statements are true:
You don’t specify the
LTTng archived the current trace chunk (see lttng-concepts(7))
RS at least once during its lifetime.
Then all the subdirectories of the output directory of
(local or remote) are considered trace chunk archives once the
command exits. In other words, it’s safe to read them, modify them, move
them, or remove then.
See the “EXAMPLES” section below for usage examples.
Destroy all the recording sessions of your Unix user, or of all
users if your Unix user is
root, as listed in the output of
lttng-list(1), instead of the current recording session or the
recording session named
Do not ensure that the trace data of the recording session(s) to destroy is valid before exiting.
Command warning (something went wrong during the command)
1 to abort the process after the first error is
Path to the LTTng home directory.
Useful when the Unix user running the commands has a non-writable home directory.
Absolute path to the manual pager to use to read the LTTng
command-line help (with lttng-help(1) or with the
--help option) instead of
Path to the directory containing the
session.xsd recording session
configuration XML schema.
--sessiond-path general option overrides this environment
Unix user’s LTTng runtime configuration.
Default output directory of LTTng traces in local and snapshot modes.
Override this path with the
--output option of the
Unix user’s LTTng runtime and configuration directory.
$LTTNG_HOME defaults to the value of the
Example:Destroy the current recording session.
Example:Destroy the current recording session without waiting for completion.
lttng destroy --no-wait
Example:Destroy a specific recording session.
lttng destroy my-session
Example:Destroy all recording sessions.
lttng destroy --all
Special thanks to Michel Dagenais and the DORSAL laboratory 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.