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-rw-r--r--man/journalctl.xml30
1 files changed, 25 insertions, 5 deletions
diff --git a/man/journalctl.xml b/man/journalctl.xml
index a3192539dc..b57afb6ebf 100644
--- a/man/journalctl.xml
+++ b/man/journalctl.xml
@@ -773,21 +773,41 @@
</varlistentry>
<varlistentry>
+ <term><option>--sync</option></term>
+
+ <listitem><para>Asks the journal daemon to write all yet
+ unwritten journal data to the backing file system and
+ synchronize all journals. This call does not return until the
+ synchronization operation is complete. This command guarantees
+ that any log messages written before its invocation are safely
+ stored on disk at the time it returns.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
<term><option>--flush</option></term>
<listitem><para>Asks the journal daemon to flush any log data
stored in <filename>/run/log/journal</filename> into
- <filename>/var/log/journal</filename>, if persistent storage is
- enabled. This call does not return until the operation is
- complete.</para></listitem>
+ <filename>/var/log/journal</filename>, if persistent storage
+ is enabled. This call does not return until the operation is
+ complete. Note that this call is idempotent: the data is only
+ flushed from <filename>/run/log/journal</filename> into
+ <filename>/var/log/journal</filename> once during system
+ runtime, and this command exits cleanly without executing any
+ operation if this has already has happened. This command
+ effectively guarantees that all data is flushed to
+ <filename>/var/log/journal</filename> at the time it
+ returns.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--rotate</option></term>
- <listitem><para>Asks the journal daemon to rotate journal files.
- </para></listitem>
+ <listitem><para>Asks the journal daemon to rotate journal
+ files. This call does not return until the rotation operation
+ is complete.</para></listitem>
</varlistentry>
+
<xi:include href="standard-options.xml" xpointer="help" />
<xi:include href="standard-options.xml" xpointer="version" />
<xi:include href="standard-options.xml" xpointer="no-pager" />