new: [myc-update] add SystemMaxUse=200M for journalctl

bin/myc-update

@@ -113,6 +113,15 @@ sed -ri 's/^# (export LS_OPTIONS=.--color=auto.)/\1/;
 EOF
 fi
 
+## add option to limit log size
+journalctl_config_file="/etc/systemd/journald.conf"
+if [ -f "$journalctl_config_file" ] &&
+       ! grep -q "^SystemMaxUse=" "$journalctl_config_file"; then
+    Wrap -d "Limit system journal logs to 200M" <<EOF || exit 1
+sed -ri 's/^#SystemMaxUse=$/SystemMaxUse=200M/g' "$journalctl_config_file"
+systemctl restart systemd-journald.service
+EOF
+fi
 
 for keyfile in {/root,/home/debian}/.ssh/authorized_keys; do
     [ -e "$keyfile" ] || continue