Provided by: lttng-tools_2.7.1-2~fakesync1_amd64 bug


       lttng-relayd - LTTng remote trace collection daemon


       lttng-relayd [OPTIONS]


       The  LTTng  project  aims  at  providing  highly  efficient tracing tools for Linux.  It's
       tracers help tracking down performance issues and debugging  problems  involving  multiple
       concurrent processes and threads. Tracing across multiple systems is also possible.

       The  relay  daemon  listens by default on all network interfaces to gather trace data, but
       only on localhost for viewer connections. This daemon  does  not  require  any  particular
       permissions  as  long  as  it can write in the output folder and listen on the ports. If a
       user is within a secured network and/or has proper  firewall  settings,  lttng-relayd  can
       listen   to   viewer   connections   from   all   network  interfaces  by  specifying  '-L

       Traces can be either viewed "live" (as they are produced) by attaching to the live  viewer
       port  using  LTTng live protocol, or after tracing has been stopped. Once a trace has been
       streamed completely, the trace can be processed by any tool that can process a local LTTng
       CTF trace.

       By   default,   the  relayd  outputs  the  traces  in  :  ~/lttng-traces/hostname/session-

       The prefix (~/lttng-traces) can be configured on  the  relayd  side  (see  below  for  the
       option), the other folders can be configured when creating the trace on the sessiond side.


       This program follows the usual GNU command line syntax with long options starting with two
       dashes. Below is a summary of the available options.

       -h, --help
              Show summary of possible options and commands

       -V, --version
              Show version.

       -v, --verbose
              Increase verbosity

              There is three debugging level which will print on  stderr.  Maximum  verbosity  is

       -d, --daemonize
              Start as a daemon

       -b, --background
              Start as a daemon, keeping console open

       -g, --group NAME
              Specify the tracing group name. (default: tracing)

       -C, --control-port
              Control port URL (tcp:// is the default)

       -D, --data-port
              Data port URL (tcp:// is the default)

       -L, --live-port URL
              Live view port URL (tcp://localhost:5344 is the default).

       -o, --output
              Output base directory. Must use an absolute path (~/lttng-traces is the default)

       -V, --version
              Show version number


              Control timeout of socket connection, receive and send. Takes an integer parameter:
              the timeout value, in milliseconds. A value of 0 or -1  uses  the  timeout  of  the
              operating system (this is the default).

              File path used for relay daemon health check communication.


       babeltrace(1), lttng-sessiond(8), lttng-ust(3), lttng(1)


       For  now  only TCP is supported on both control and data port.  Control will always remain
       TCP-only since it is low-volume and needs absolutely to be reliable,  but  eventually  the
       data connection could support UDP.

       For  unprivileged  user  running  lttng-relayd, the maximum number of file descriptors per
       process is usually 1024. This limits the number of connections and tracefiles opened. This
       limit can be configured see ulimit(3).


       No show stopper bugs are known yet in this version.

       If  you  encounter  any  issues or usability problem, please report it on our mailing list
       <> to help improve this project.


       lttng-relayd is distributed under the GNU General Public License version 2. See  the  file
       COPYING for details.

       A Web site is available at for more information on the LTTng project.

       You can also find our git tree at

       Mailing lists for support and development: <>.

       You can find us on IRC server (OFTC) in #lttng.


       lttng-relay  was originally written by Julien Desfossez and David Goulet. More people have
       since  contributed   to   it.   It   is   currently   maintained   by   Julien   Desfossez

                                          July 15, 2012                           LTTNG-RELAYD(8)