[systemd-devel] Why systemd-journald is creating '/var/log/journal/machine_id" directory when Storage=auto

[Nishant Nayan]

Also I was wondering where in the code does journald.config file changes
are parsed?
For example in the above code , the line :-
      if (s->storage == STORAGE_PERSISTENT)
Here, s->storage corresponds to 'Storage' option of conf file right?
How is it getting set when we edit the conf file?

Also, on doing "ls /run/log/journal/machine_id/"
I can see output as following
<some_big_number>.journal
<some_another_big_number>.journal
.
.
.
system.journal

Is 'system.journal' is the currently active journal and rest are archived
journals?


Nishant

On Sun, 29 Aug 2021 at 17:56, Michael Chapman <mike at very.puzzling.org>
wrote:

> On Sun, 29 Aug 2021, Nishant Nayan wrote:
> > I was looking into the code of systemd-journald and found this (in
> > system_journal_open() ) :-
> >
> > if (!s->system_journal && IN_SET(s->storage, STORAGE_PERSISTENT,
> > STORAGE_AUTO) && (flush_requested || flushed_flag_is_set())) {
> >
> >             /* If in auto mode: first try to create the machine
> >              * path, but not the prefix.
> >              *
> >              * If in persistent mode: create /var/log/journal and
> >              * the machine path */
> >
> >             if (s->storage == STORAGE_PERSISTENT)
> >                     (void) mkdir_p("/var/log/journal/", 0755);
> >
> >             (void) mkdir(s->system_storage.path, 0755);
> >
> >             fn = strjoina(s->system_storage.path, "/system.journal");
> [...]
> >
> > Also after reading the comment, how is it possible to create
> > '/var/log/journal/machine_id' without creating the prefix? I am assuming
> > '/var/log/journal' is the prefix .
>
> Sorry, I actually misread your question here.
>
> In Storage=auto mode, no attempt to create the /var/log/journal directory
> is made. If it doesn't exist, then the persistent journal simply fails to
> be opened.
>
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