LTTNG-ENABLE-ROTAT(1) LTTng Manual LTTNG-ENABLE-ROTAT(1)
lttng-enable-rotation - Set a tracing session's rotation schedule
lttng [GENERAL OPTIONS] enable-rotation (--timer=PERIOD | --size=SIZE) [--session=SESSION]
The lttng enable-rotation command sets a rotation schedule for the current tracing session, or for the tracing session named SESSION if provided. See lttng-rotate(1) for more information about the concepts of a tracing session rotation and a trace chunk. With the --timer option, the rotation schedule is set so that an automatic rotation occurs at least every PERIOD (microseconds without a unit suffix). With the --size option, the rotation schedule is set so that an automatic rotation occurs every time the total size of the flushed part of the current trace chunk is at least SIZE (bytes without a unit suffix). With both the --timer and --size options, LTTng checks the schedule condition periodically using the monitor timers of the tracing session’s channels. This means that, with the --timer option, the automatic rotation can occur when the elapsed time since the last automatic rotation is greater than PERIOD, and with the --size option, the automatic rotation can occur when the size of the flushed part of the current trace chunk is greater than SIZE. See the --monitor-timer option in lttng-enable-channel(1) for more information about the monitor timer. The naming convention of a trace chunk archive which an automatic rotation creates is the same as with the immediate rotation command, lttng-rotate(1). You can unset a rotation schedule with the lttng-disable-rotation(1) command. See LIMITATIONS for important limitations regarding this command.
General options are described in lttng(1). Rotation schedule condition One of: --size=SIZE Set a rotation schedule so that an automatic rotation occurs every time the total size of the flushed part of the current trace chunk is at least SIZE bytes. The k (kiB), M (MiB), and G (GiB) suffixes are supported. --timer=PERIOD Set a rotation schedule so that an automatic rotation occurs at least every PERIOD microseconds. The ms (milliseconds), s (seconds), m (minutes), and h (hours) suffixes are supported. Target -s SESSION, --session=SESSION Set a rotation schedule for the tracing session named SESSION instead of the current tracing session. 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.
The lttng enable-rotation command only works when: · The tracing session is created in normal mode or in network streaming mode (see lttng-create(1)). · No channel was created with a configured trace file count or size limit (see the --tracefile-size and --tracefile-count options in lttng-enable-channel(1)). For a given tracing session, LTTng only performs an automatic rotation when no other rotation is currently happening.
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@example.com · 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:firstname.lastname@example.org>.
lttng-rotate(1), lttng-disable-rotation(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@example.com. 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 firstname.lastname@example.org LTTng 2.12.0-pre 10/29/2018 LTTNG-ENABLE-ROTAT(1)
Pages that refer to this page: lttng(1), lttng-destroy(1), lttng-disable-rotation(1), lttng-enable-channel(1), lttng-regenerate(1), lttng-rotate(1), lttng-stop(1)