From: Philippe Proulx Date: Wed, 11 Nov 2015 20:34:19 +0000 (-0500) Subject: doc/man: create lttng-create(1) and update/fix content X-Git-Tag: v2.8.0-rc1~54 X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=commitdiff_plain;h=ba50d9675100d0072fbeef9420db877fe09a3fa5 doc/man: create lttng-create(1) and update/fix content Signed-off-by: Philippe Proulx Signed-off-by: Jérémie Galarneau --- diff --git a/doc/man/Makefile.am b/doc/man/Makefile.am index bb123d767..5f5745653 100644 --- a/doc/man/Makefile.am +++ b/doc/man/Makefile.am @@ -8,7 +8,8 @@ manaddsuffix = $(addsuffix $(1),$(addprefix $(srcdir)/,$(2))) # List only the names without the .*.txt extension here: MAN1_NAMES = \ - lttng + lttng \ + lttng-create MAN3_NAMES = MAN8_NAMES = MAN1_NO_ASCIIDOC_NAMES = lttng-crash @@ -47,7 +48,8 @@ MAN_XML = $(patsubst $(srcdir)/%.txt,%.xml,$(MAN_TXT)) COMMON_TXT = \ $(srcdir)/common-footer.txt \ $(srcdir)/common-cmd-footer.txt \ - $(srcdir)/common-cmd-options-head.txt + $(srcdir)/common-cmd-options-head.txt \ + $(srcdir)/common-cmd-help-options.txt # config ASCIIDOC_CONF = $(srcdir)/asciidoc.conf diff --git a/doc/man/common-cmd-help-options.txt b/doc/man/common-cmd-help-options.txt new file mode 100644 index 000000000..c1120c3c1 --- /dev/null +++ b/doc/man/common-cmd-help-options.txt @@ -0,0 +1,11 @@ +Program information +~~~~~~~~~~~~~~~~~~~ +option:-h, option:--help:: + Show command help. ++ +This option, like linklttng: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. + +option:--list-options:: + List available command options. diff --git a/doc/man/lttng-create.1.txt b/doc/man/lttng-create.1.txt new file mode 100644 index 000000000..13448e57c --- /dev/null +++ b/doc/man/lttng-create.1.txt @@ -0,0 +1,201 @@ +lttng-create(1) +=============== + + +NAME +---- +lttng-create - Create an LTTng tracing session + + +SYNOPSIS +-------- +Normal mode: + +[verse] +*lttng* ['GENERAL OPTIONS'] *create* [option:--output='PATH' | option:--no-output] + [option:--shm-path='PATH'] ['SESSION'] + +Snapshot mode: + +[verse] +*lttng* ['GENERAL OPTIONS'] *create* option:--snapshot + [option:--set-url='URL' | option:--ctrl-url='URL' option:--data-url='URL'] + [option:--shm-path='PATH'] ['SESSION'] + +Live mode: + +[verse] +*lttng* ['GENERAL OPTIONS'] *create* option:--live[='DELAYUS'] + [option:--set-url='URL' | option:--ctrl-url='URL' option:--data-url='URL'] + [option:--shm-path='PATH'] ['SESSION'] + + +DESCRIPTION +----------- +The `lttng create` command creates a new tracing session. + +A tracing session is a named container of channels, which in turn +contain event rules. It is domain-agnostic, in that channels and event +rules can be enabled for the user space tracer and/or the Linux +kernel tracer. + +On execution, an `.lttngrc` file is created, if it does not exist, in the +user's home directory. This file contains the name of the current tracing +session. When creating a new tracing session with `lttng create`, the +current tracing session is set to this new tracing session. The +linklttng:lttng-set-session(1) command can be used to set the current +tracing session without manually editing the `.lttngrc` file. + +If 'SESSION' is omitted, a session name is automatically created having +this form: `auto-YYYYmmdd-HHMMSS`. 'SESSION' *must not* contain the +character `/`. + +The option:--shm-path option can be used to specify the path to the +shared memory holding the ring buffers. Specifying a location on an +NVRAM file system makes it possible to retrieve the latest recorded +trace data when the system reboots after a crash. To view the events +of ring buffer files after a system crash, use the +linklttng:lttng-crash(1) utility. + +Tracing sessions are destroyed using the linklttng:lttng-destroy(1) +command. + + +Creation modes +~~~~~~~~~~~~~~ +There are three tracing session modes: + +Normal mode:: + Traces the local system and writes the trace to the local + file system. The option:--output option specifies the trace path. + If omitted, the trace is written in the `$LTTNG_HOME/lttng-traces` + directory (`$LTTNG_HOME` defaults to `$HOME`). The file system + output can be disabled using the option:--no-output option. + +Snapshot mode:: + Traces the local system without writing the trace to the local file + system (implicit option:--no-output option). Channels are automatically + configured to be snapshot-ready on creation (see + linklttng:lttng-enable-channel(1)). The linklttng:lttng-snapshot(1) + command is used to take snapshots of the current ring buffers. + The option:--set-url, or option:--ctrl-url and option:--data-url + options set the default snapshot output destination. + +Live mode:: + Traces the local system, sending trace data to an LTTng relay daemon + over the network (see linklttng:lttng-relayd(8)). The + option:--set-url, or option:--ctrl-url and option:--data-url options + set the trace output destination. The live output URLs cannot use + the `file://` protocol (see URL format below). + + +[[url-format]] +URL format +~~~~~~~~~~ +The option:--set-url, option:--ctrl-url, and option:--data-url options +specify URLs. + +The format of those URLs is one of: + +[verse] +file://'TRACEPATH' +'NETPROTO'://('HOST' | 'IPADDR')[:__CTRLPORT__[:__DATAPORT__]][/'TRACEPATH'] + +The `file://` protocol targets the *local file system*. + +'TRACEPATH':: + Absolute path to trace files on the local file system. + +The other version is used for *network streaming*. + +'NETPROTO':: + Network protocol, amongst: ++ +* `net`: TCP over IPv4; the default values of `` and + `` are resp. 5342 and 5343 +* `net6`: TCP over IPv6: same default ports as `net` protocol +* `tcp`: same as `net` protocol; can only be used with the + option:--ctrl-url and option:--data-url options together +* `tcp6`: same as `net6` protocol; can only be used with the + option:--ctrl-url and option:--data-url options together + +('HOST' | 'IPADDR'):: + Hostname or IP address (IPv6 address *must* be enclosed in brackets + (`[` and `]`); see https://www.ietf.org/rfc/rfc2732.txt[RFC 2732]). + +'CTRLPORT':: + Control port. + +'DATAPORT':: + Data port. + +'TRACEPATH':: + Path of trace files on the remote file system. This path is relative + to the base output directory set on the relay daemon side; + see linklttng:lttng-relayd(8). + + +include::common-cmd-options-head.txt[] + + +Mode +~~~~ +option:--live[='DELAYUS']:: + Create the session in live mode. The optional 'DELAYUS' parameter, + given in microseconds, is the maximum time the user can wait for + the data to be flushed. This mode can be set with a network URL + (options option:--set-url, or option:--ctrl-url and option:--data-url) + and must have a relay daemon listening (see linklttng:lttng-relayd(1)). ++ +By default, 'DELAYUS' is 1000000 and the network URL is set to +`net://127.0.0.1`. + +option:--snapshot:: + Create the session in snapshot mode. This is the equivalent of using + the option:--no-output option and creating all the channels of this + new tracing session in overwrite mode with an `mmap` output type. + + +Output +~~~~~~ +option:--no-output:: + Do not output any trace data. + +option:-o, option:--output='PATH':: + Set trace output path to 'PATH'. + +option:--shm-path='PATH':: + Create shared memory holding buffers at 'PATH'. + + +URL +~~~ +See the <> section above for more information +about the syntax of the following options' 'URL' argument. + +option:-C, option:--ctrl-url='URL':: + Set control path URL to 'URL' (must use option:--data-url option + also). + +option:-D, option:--data-url='URL':: + Set data path URL to 'URL' (must use option:--ctrl-url option + also). + +option:-U, option:--set-url='URL':: + Set URL destination of the trace data to 'URL'. It is persistent for + the session lifetime. This option sets both data + (option:--data-url option) and control (option:--ctrl-url option) + URLs at the same time. + + +include::common-cmd-help-options.txt[] + + +include::common-cmd-footer.txt[] + + +SEE ALSO +-------- +linklttng:lttng-destroy(1), +linklttng:lttng-set-session(1), +linklttng:lttng(1)