lttng-enable-rotation - Set an LTTng recording session rotation schedule

       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.

       The lttngenable-rotation command sets a recording session rotation schedule for:

       With the --session=SESSION option
           The recording session named SESSION.

       Without the --session option
           The current recording session (see lttng-concepts(7) to learn more about the current recording
           session).

       See lttng-concepts(7) to learn more about the recording session rotation and trace chunk concepts.

       With the --timer=PERIODUS option, the enable-rotation command sets a rotation schedule so that LTTng
       performs an automatic rotation at least every PERIODUS.

       With the --size=SIZE option, the enable-rotation command sets a rotation schedule so that LTTng performs
       an automatic rotation every time the total size of the flushed part of the current trace chunk is at
       least SIZE.

       For both the --timer and --size options, LTTng checks the schedule condition periodically using the
       monitor timers of the channels of the selected recording session (see the --monitor-timer option of the
       lttng-enable-channel(1) command). This means that:

       •   With the --timer=PERIODUS option, LTTng can perform an automatic rotation when the elapsed time since
           the last automatic rotation is slightly greater than PERIODUS.

           The exact precision depends on the precision of the monitor timer, which relies on the precision of
           the platform implementation of POSIX timers.

       •   With the --size=SIZE option, LTTng can perform an automatic rotation when the size of the flushed
           part of the current trace chunk is greater than SIZE.

       You may combine the --timer and --size options.

       See the lttng-concepts(7) to learn how LTTng names a trace chunk archive directory.

       See the “EXAMPLES” section below for usage examples.

       Unset a recording session rotation schedule with the lttng-disable-rotation(1) command.

       Important

           You may only use the enable-rotation command when:

           •   The selected recording session was 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 of the lttng-enable-channel(1) command).

           For a given recording session, LTTng only performs an automatic rotation when it’s not currently
           performing a rotation.

LTTNG_ABORT_ON_ERROR
           Set to 1 to abort the process after the first error is encountered.

       LTTNG_HOME
           Path to the LTTng home directory.

           Defaults to $HOME.

           Useful when the Unix user running the commands has a non-writable home directory.

       LTTNG_MAN_BIN_PATH
           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 /usr/bin/man.

       LTTNG_SESSION_CONFIG_XSD_PATH
           Path to the directory containing the session.xsd recording session configuration XML schema.

       LTTNG_SESSIOND_PATH
           Absolute path to the LTTng session daemon binary (see lttng-sessiond(8)) to spawn from the lttng-create(1) command.

           The --sessiond-path general option overrides this environment variable.

Example1.Setthesize-basedrotationscheduleofthecurrentrecordingsession.

           See the --size option.

               $ lttng disable-rotation --size=256M

       Example2.Settheperiodicrotationscheduleofaspecificrecordingsession.

           See the --timer and --session options.

               $ lttng disable-rotation --session=my-session --timer=5m

0
           Success

       1
           Command error

       2
           Undefined command

       3
           Fatal error

       4
           Command warning (something went wrong during the command)

$LTTNG_HOME/.lttngrc
           Unix user’s LTTng runtime configuration.

           This is where LTTng stores the name of the Unix user’s current recording session between executions
           of lttng(1).  lttng-create(1) and lttng-set-session(1) set the current recording session.

       $LTTNG_HOME/lttng-traces
           Default output directory of LTTng traces in local and snapshot modes.

           Override this path with the --output option of the lttng-create(1) command.

       $LTTNG_HOME/.lttng
           Unix user’s LTTng runtime and configuration directory.

       $LTTNG_HOME/.lttng/sessions
           Default directory containing the Unix user’s saved recording session configurations (see lttng-save(1) and lttng-load(1)).

       /etc/lttng/sessions
           Directory containing the system-wide saved recording session configurations (see lttng-save(1) and
           lttng-load(1)).

       Note$LTTNG_HOME defaults to the value of the HOME environment variable.

       lttng-enable-rotation - Set an LTTng recording session rotation schedule

       See lttng(1) for GENERALOPTIONS.

   Rotationschedulecondition--size=SIZE
           Set a rotation schedule so that LTTng performs an automatic rotation 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=PERIODUS
           Set a rotation schedule so that LTTng performs an automatic rotation approximately every PERIODUS
           microseconds.

           The ms (milliseconds), s (seconds), m (minutes), and h (hours) suffixes are supported.

   Recordingtarget-sSESSION, --session=SESSION
           Set a rotation schedule for the recording session named SESSION instead of the current recording
           session.

   Programinformation-h, --help
           Show help.

           This option attempts to launch /usr/bin/man to view this manual page. Override the manual pager path
           with the LTTNG_MAN_BIN_PATH environment variable.

       --list-options
           List available command options and quit.

       •   LTTng project website <https://lttng.org>

       •   LTTng documentation <https://lttng.org/docs>

       •   LTTng bug tracker <https://bugs.lttng.org>

       •   Git repositories <https://git.lttng.org>

       •   GitHub organization <https://github.com/lttng>

       •   Continuous integration <https://ci.lttng.org/>

       •   Mailing list <https://lists.lttng.org/> for support and development: lttng-dev@lists.lttng.org

       •   IRC channel <irc://irc.oftc.net/lttng>: #lttng on irc.oftc.net

lttng(1), lttng-create(1), lttng-disable-rotation(1), lttng-rotate(1), lttng-concepts(7)

LTTng 2.13.14                                     14 June 2021                             LTTNG-ENABLE-ROTAT(1)

lttng [GENERALOPTIONS] enable-rotation [--session=SESSION]
             (--timer=PERIODUS | --size=SIZE | --timer=PERIODUS--size=SIZE)

       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.