lttng-start(1) ============== :revdate: 7 April 2016 NAME ---- lttng-start - Start LTTng tracers SYNOPSIS -------- [verse] *lttng* ['linkgenoptions:(GENERAL OPTIONS)'] *start* ['SESSION'] DESCRIPTION ----------- The `lttng start` command starts the various LTTng tracers for a given inactive tracing session. Starting the LTTng tracers has the effect that all enabled event rules within enabled channels can make their target event sources _emit_ trace events. Whether they are recorded to the local file system, sent over the network, or not recorded at all depends on the specific configuration of the tracing session in which tracing is started. See man:lttng-create(1) for different session modes. A tracing session with running tracers is said to be _active_. Active tracing sessions can return to the inactive state using the man:lttng-stop(1) command. If 'SESSION' is omitted, the LTTng tracers are started for the current tracing session (see man:lttng-create(1) for more information about the current tracing session). Otherwise, they are started for the existing tracing session named 'SESSION'. `lttng list` outputs all the existing tracing sessions (see man:lttng-list(1)). include::common-cmd-options-head.txt[] include::common-cmd-help-options.txt[] include::common-cmd-footer.txt[] SEE ALSO -------- man:lttng-stop(1), man:lttng(1)