journald not saving logs to disk

[ktosiek]

After installing NixOS from http://hydra.nixos.org/build/25226407/download/1/nixos-graphical-15.09.24.4a63983-x86_64-linux.iso there was no /var/log/journal/.
As journald is by default guessing if it should write logs to disk based on that directories existance, all my logs were getting saved to /run/log/.

Shouldn't we use Storage=persistent by default?

[dezgeg]

Hmm, I can see this as well. It's probably 5d02c02, sounds like this might be needed as well (EDIT: bleh, this doesn't create the journal directory either):

diff --git nixos/modules/system/boot/systemd.nix nixos/modules/system/boot/systemd.nix
index 05369da..f290253 100644
--- nixos/modules/system/boot/systemd.nix
+++ nixos/modules/system/boot/systemd.nix
@@ -733,6 +733,7 @@ in
       };

     environment.etc."tmpfiles.d/systemd.conf".source = "${systemd}/example/tmpfiles.d/systemd.conf";
+    environment.etc."tmpfiles.d/var.conf".source = "${systemd}/example/tmpfiles.d/var.conf";
     environment.etc."tmpfiles.d/x11.conf".source = "${systemd}/example/tmpfiles.d/x11.conf";

     environment.etc."tmpfiles.d/nixos.conf".text =

Details: in systemd.conf, we have

z /var/log/journal 2755 root systemd-journal - -
z /var/log/journal/%m 2755 root systemd-journal - -

but looks like that's not actually enough (man tmpfiles.d):

       z
           Adjust the access mode, group and user, and restore the SELinux security context of a file or directory, if it exists. Lines of this type accept shell-style globs in place of normal path names. Does not follow symlinks.