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man: add a note about "archived" journal files and when files can be copied 

Issue #6673 requests advice on backup strategy. But the right backup strategy
depends on many factors, too many to describe in a man page. So let's just
provide some general information which files are mutable and that it is always
safe to use/copy files.

Closes #6673.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2018-03-23 13:54:20 +01:00
parent 2230a2908b
commit 4bb890bc04
1 changed files with 15 additions and 6 deletions
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21
man/systemd-journald.service.xml
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@ -261,9 +261,7 @@ systemd-tmpfiles --create --prefix /var/log/journal</programlisting>
<varlistentry>
<term><filename>/etc/systemd/journald.conf</filename></term>
<listitem><para>Configure
<command>systemd-journald</command>
behavior. See
<listitem><para>Configure <command>systemd-journald</command> behavior. See
<citerefentry><refentrytitle>journald.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
</para></listitem>
</varlistentry>
@ -274,8 +272,7 @@ systemd-tmpfiles --create --prefix /var/log/journal</programlisting>
<term><filename>/var/log/journal/<replaceable>machine-id</replaceable>/*.journal</filename></term>
<term><filename>/var/log/journal/<replaceable>machine-id</replaceable>/*.journal~</filename></term>
<listitem><para><command>systemd-journald</command> writes
entries to files in
<listitem><para><command>systemd-journald</command> writes entries to files in
<filename>/run/log/journal/<replaceable>machine-id</replaceable>/</filename>
or
<filename>/var/log/journal/<replaceable>machine-id</replaceable>/</filename>
@ -287,7 +284,19 @@ systemd-tmpfiles --create --prefix /var/log/journal</programlisting>
<filename>/var/log/journal</filename> is not available, or
when <option>Storage=volatile</option> is set in the
<citerefentry><refentrytitle>journald.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
configuration file.</para></listitem>
configuration file.</para>
<para>When <filename>systemd-journald</filename> ceases writing to a journal file,
it will be renamed to <literal><replaceable>original-name</replaceable>@<replaceable>suffix.journal</replaceable></literal>
(or <literal><replaceable>original-name</replaceable>@<replaceable>suffix.journal~</replaceable></literal>).
Such files are "archived" and will not be written to any more.</para>
<para>In general, it is safe to read or copy any journal file (active or archived).
<citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
and the functions in the
<citerefentry><refentrytitle>sd-journal</refentrytitle><manvolnum>3</manvolnum></citerefentry>
library should be able to read all entries that have been fully written.</para>
</listitem>
</varlistentry>
<varlistentry>