Provided by: lttng-tools_2.7.1-2~fakesync1_i386 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 tcp://'.

       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-

       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

       -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 -vvv.

       -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

              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


       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


       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)