systemd-conf: changed journald storage to persistent

With persistent storage systemd journal logs don't get lost upon reboot.
Limited use of persistent memory with SystemMaxUse to 256M.

BugzID: 61999

Signed-off-by: Tobias Jäggi <tobias.jaeggi@netmodule.com>

recipes-core/systemd/systemd-conf/0001-changed-journald-storage-to-persistent.patch

@@ -0,0 +1,42 @@
+From 6050a8a8110d6521605914b2a246f7d9f835fea4 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Tobias=20J=C3=A4ggi?= <tobias.jaeggi@netmodule.com>
+Date: Wed, 11 Mar 2020 16:01:39 +0100
+Subject: [PATCH] changed journald storage to persistent
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+With persistent storage systemd journal logs don't get lost upon reboot.
+Limited use of persistent memory with SystemMaxUse to 256M.
+
+BugzID: 61999
+
+Signed-off-by: Tobias Jäggi <tobias.jaeggi@netmodule.com>
+---
+ src/journal/journald.conf | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/journal/journald.conf b/src/journal/journald.conf
+index 2f1c661153..617ed51148 100644
+--- a/src/journal/journald.conf
++++ b/src/journal/journald.conf
+@@ -12,14 +12,14 @@
+ # See journald.conf(5) for details.
+ 
+ [Journal]
+-#Storage=auto
++Storage=persistent
+ #Compress=yes
+ #Seal=yes
+ #SplitMode=uid
+ #SyncIntervalSec=5m
+ #RateLimitIntervalSec=30s
+ #RateLimitBurst=10000
+-#SystemMaxUse=
++SystemMaxUse=256M
+ #SystemKeepFree=
+ #SystemMaxFileSize=
+ #SystemMaxFiles=100
+-- 
+2.11.0
+

recipes-core/systemd/systemd-conf_%.bbappend

@@ -2,7 +2,8 @@ FILESEXTRAPATHS_prepend := "${THISDIR}/${MACHINE}/${PN}:${THISDIR}/${PN}:"
 
 SRC_URI_append = " \
                  file://system.conf \
-		 "
+                 file://0001-changed-journald-storage-to-persistent.patch \
+                 "
 
 do_install_append() {
     mkdir -p ${D}/etc/systemd/