lttng-snapshot(1)
=================
-:revdate: 3 May 2021
+:revdate: 17 May 2021
NAME
When LTTng takes a snapshot, it sends the sub-buffer dump of the
selected tracing session to the local file system or over the network to
a listening relay daemon (man:lttng-relayd(8)). See the
-<<output,Snapshot output>> section below to learn more.
+``<<output,Snapshot output>>'' section below to learn more.
When LTTng takes a snapshot, it does :not: clear the sub-buffers of the
selected tracing session. In other words, different snapshots of the
A `snapshot-session` trigger action can also take a tracing session
snapshot (see man:lttng-add-trigger(1)).
+See the ``<<examples,EXAMPLES>>'' section below for usage examples.
+
If you want, instead, to keep all the trace data, but divide it into
archived chunks which are then, like snapshots, ready to be processed,
see the tracing session rotation feature in man:lttng-concepts(7). Trace
Output
~~~~~~
-See the <<output,Snapshot output>> section above.
+See the ``<<output,Snapshot output>>'' section above.
option:-C 'URL', option:--ctrl-url='URL'::
Set the control path URL to 'URL'.
include::common-lttng-cmd-after-options.txt[]
+[[examples]]
+EXAMPLES
+--------
+.Take a snapshot of the current tracing session, sending the trace files to its snapshot output.
+====
+[role="term"]
+----
+$ lttng snapshot record
+----
+====
+
+.Take a snapshot of a specific tracing session, giving it a custom name.
+====
+See the option:--session and option:--name options.
+
+[role="term"]
+----
+$ lttng snapshot record --session=my-session --name=SNAP
+----
+====
+
+.Take a snapshot of the current tracing session, sending the trace files to a custom location.
+====
+See the ``Output directory'' section of man:lttng-relayd(8) to
+understand where the relay daemon to connect to (`3.96.87.215`) writes
+the received traces.
+
+[role="term"]
+----
+$ lttng snapshot record net://3.96.87.215
+----
+====
+
+.Replace the snapshot output of a specific tracing session with a local file system path.
+====
+See the option:--session option.
+
+[role="term"]
+----
+$ lttng snapshot del-output --session=monk 1
+$ lttng snapshot add-output --session=monk \
+ file:///path/to/snapshots
+----
+====
+
+.Take a snapshot of the current tracing session, making sure its size is not over 4{nbsp}MiB.
+====
+See the option:--max-size option.
+
+[role="term"]
+----
+$ lttng snapshot record --max-size=4M
+----
+====
+
+
include::common-footer.txt[]