Bug#801906: /etc/systemd/journald.conf: Journal defaults to non-persistent across boots.

[Mikhail Morfikov]

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On 2015-10-15 22:48, Ben Longbons wrote:
> Package: systemd
> Version: 227-2
> Severity: normal
> File: /etc/systemd/journald.conf
> 
> Dear Maintainer,
> 
> The default configuration of journald loses logs whenever the system is
> rebooted. This is both a regression compared to non-systemd systems as
> well as breaking most systemd-specific debugging tutorials.
> 
> The trivial fix is to set Storage=persistent in /etc/systemd/journald.conf
> 
> Interestingly, after the next boot, Storage=auto does the same thing
> once /var/log/journal exists. This is mainly of interest to avoid the
> "config file changed" problem when running `aptitude upgrade`, since
> a config option that silently fails to work depending on not-in-/etc
> files is kind of scary.
> 
> Note that when journald creates /var/log/journal, it has
> permissions drwxr-sr-x and owner:group root:systemd-journal,
> which is not what users would probably create it with manually.
> 
> -- Package-specific info:
> 
> -- System Information:
> Debian Release: stretch/sid
>   APT prefers testing
>   APT policy: (600, 'testing'), (500, 'unstable'), (1, 'experimental')
> Architecture: amd64 (x86_64)
> Foreign Architectures: i386
> 
> Kernel: Linux 4.2.0-1-amd64 (SMP w/4 CPU cores)
> Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
> Shell: /bin/sh linked to /bin/dash
> Init: systemd (via /run/systemd/system)
> 
> Versions of packages systemd depends on:
> ii  adduser         3.113+nmu3
> ii  libacl1         2.2.52-2
> ii  libapparmor1    2.10-2+b1
> ii  libaudit1       1:2.4.4-4
> ii  libblkid1       2.27-3
> ii  libc6           2.19-22
> ii  libcap2         1:2.24-12
> ii  libcap2-bin     1:2.24-12
> ii  libcryptsetup4  2:1.6.6-5
> ii  libgcrypt20     1.6.3-2
> ii  libkmod2        21-1
> ii  liblzma5        5.1.1alpha+20120614-2.1
> ii  libmount1       2.27-3
> ii  libpam0g        1.1.8-3.1
> ii  libseccomp2     2.2.3-2
> ii  libselinux1     2.3-2+b1
> ii  libsystemd0     227-2
> ii  mount           2.27-3
> ii  sysv-rc         2.88dsf-59.2
> ii  udev            227-2
> ii  util-linux      2.27-3
> 
> Versions of packages systemd recommends:
> ii  dbus            1.10.0-3
> ii  libpam-systemd  227-2
> 
> Versions of packages systemd suggests:
> ii  systemd-container  227-2
> pn  systemd-ui         <none>
> 
> -- no debconf information
> 
In the manual (http://www.freedesktop.org/software/systemd/man/journald.conf.html),
there's explicitly said that:

Storage=
	Controls where to store journal data. One of "volatile",
 	"persistent", "auto" and "none". If "volatile", journal log data
	will be stored only in memory, i.e. below the /run/log/journal
	hierarchy (which is created if needed). If "persistent", data will
	be stored preferably on disk, i.e. below the /var/log/journal
	hierarchy (which is created if needed), with a fallback to
	/run/log/journal (which is created if needed), during early boot
	and if the disk is not writable. "auto" is similar to "persistent"
	but the directory /var/log/journal is not created if needed, so
	that its existence controls where log data goes. "none" turns off
	all storage, all log data received will be dropped. Forwarding to
	other targets, such as the console, the kernel log buffer, or a
	syslog socket will still work however. Defaults to "auto".
	
So if you have "auto", the logs go to the /var/log/journal/ directory only
when the directory already exists. So, in your case, when you've set
"persistent", the system created the directories for you, and when you
switched to "auto" again, the journal was using the directory because it
exists.
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