Moved the journald configuration to a file in it's drop in directory. Also, explicitly set volatile storage to cut down on SD card writes.

pi4/files/etc/systemd/journald.conf

@@ -1,47 +0,0 @@
-#  This file is part of systemd.
-#
-#  systemd is free software; you can redistribute it and/or modify it under the
-#  terms of the GNU Lesser General Public License as published by the Free
-#  Software Foundation; either version 2.1 of the License, or (at your option)
-#  any later version.
-#
-# Entries in this file show the compile time defaults. Local configuration
-# should be created by either modifying this file, or by creating "drop-ins" in
-# the journald.conf.d/ subdirectory. The latter is generally recommended.
-# Defaults can be restored by simply deleting this file and all drop-ins.
-#
-# Use 'systemd-analyze cat-config systemd/journald.conf' to display the full config.
-#
-# See journald.conf(5) for details.
-
-[Journal]
-#Storage=auto
-#Compress=yes
-#Seal=yes
-#SplitMode=uid
-#SyncIntervalSec=5m
-#RateLimitIntervalSec=30s
-#RateLimitBurst=10000
-SystemMaxUse=20M
-#SystemKeepFree=
-#SystemMaxFileSize=
-#SystemMaxFiles=100
-#RuntimeMaxUse=
-#RuntimeKeepFree=
-#RuntimeMaxFileSize=
-#RuntimeMaxFiles=100
-#MaxRetentionSec=
-#MaxFileSec=1month
-#ForwardToSyslog=no
-#ForwardToKMsg=no
-#ForwardToConsole=no
-#ForwardToWall=yes
-#TTYPath=/dev/console
-#MaxLevelStore=debug
-#MaxLevelSyslog=debug
-#MaxLevelKMsg=notice
-#MaxLevelConsole=info
-#MaxLevelWall=emerg
-#LineMax=48K
-#ReadKMsg=yes
-#Audit=yes

pi4/files/etc/systemd/journald.conf.d/99-ramlog.conf

@@ -0,0 +1,3 @@
+[Journal]
+Storage=volatile
+SystemMaxUse=20M