如何在重啟後讓 syslogd/klogd 附加到 syslog 而不是覆蓋？

重新啟動或崩潰後，系統日誌不會保存上一個會話的任何消息。我應該怎麼做才能告訴 syslogd/klogd 附加到 syslog 而不是覆蓋每個會話？我覺得我錯過了一些明顯的東西。

我的系統的一些背景：

• 分發：帶有busybox的Yocto（poky）
• 啟動 klogd/syslogd 的方法：init
• 啟動配置/腳本 klogd/syslogd 使用：/etc/syslog-startup.conf 和 /etc/init.d/syslog

/etc/syslog-startup.conf

# This configuration file is used by the busybox syslog init script,
# /etc/init.d/syslog[.busybox] to set syslog configuration at start time.

DESTINATION=file        # log destinations (buffer file remote)
LOGFILE=/var/log/syslog     # where to log (file)
REMOTE=loghost:514      # where to log (syslog remote)
REDUCE=no           # reduce-size logging
DROPDUPLICATES=no       # whether to drop duplicate log entries
ROTATESIZE=100          # rotate log if grown beyond X [kByte]
ROTATEGENS=3            # keep X generations of rotated logs
BUFFERSIZE=64           # size of circular buffer [kByte]
FOREGROUND=no           # run in foreground (don't use!)
LOGLEVEL=8          # local log level (between 1 and 8)

/etc/init.d/syslog

#! /bin/sh
### BEGIN INIT INFO
# Provides:             sysklogd
# Required-Start:       $remote_fs $time
# Required-Stop:        $remote_fs $time
# Default-Start:        2 3 4 5
# Default-Stop:         0 1 6
# Short-Description:    System logger
### END INIT INFO

set -e

if [ -f /etc/syslog-startup.conf ]; then
   . /etc/syslog-startup.conf
   LOG_LOCAL=0
   LOG_REMOTE=0
   for D in $DESTINATION; do
       if [ "$D" = "buffer" ]; then
           SYSLOG_ARGS="$SYSLOG_ARGS -C$BUFFERSIZE"
           LOG_LOCAL=1
       elif [ "$D" = "file" ]; then
           if [ -n "$LOGFILE" ]; then
               SYSLOG_ARGS="$SYSLOG_ARGS -O $LOGFILE"
           fi
           if [ -n "$ROTATESIZE" ]; then
               SYSLOG_ARGS="$SYSLOG_ARGS -s $ROTATESIZE"
           fi
           if [ -n "$ROTATEGENS" ]; then
               SYSLOG_ARGS="$SYSLOG_ARGS -b $ROTATEGENS"
           fi
           LOG_LOCAL=1
       elif [ "$D" = "remote" ]; then
           SYSLOG_ARGS="$SYSLOG_ARGS -R $REMOTE"
           LOG_REMOTE=1
       fi
   done
   if [ "$LOG_LOCAL" = "1" -a "$LOG_REMOTE" = "1" ]; then
       SYSLOG_ARGS="$SYSLOG_ARGS -L"
   fi
   if [ "$REDUCE" = "yes" ]; then
       SYSLOG_ARGS="$SYSLOG_ARGS -S"
   fi
   if [ "$DROPDUPLICATES" = "yes" ]; then
       SYSLOG_ARGS="$SYSLOG_ARGS -D"
   fi
   if [ -n "$LOGLEVEL" ]; then
       SYSLOG_ARGS="$SYSLOG_ARGS -l $LOGLEVEL"
   fi
else
   # default: log to 16K shm circular buffer
   SYSLOG_ARGS="-C"
fi

case "$1" in
 start)
   echo -n "Starting syslogd/klogd: "
   start-stop-daemon -S -b -n syslogd -a /sbin/syslogd -- -n $SYSLOG_ARGS
   start-stop-daemon -S -b -n klogd -a /sbin/klogd -- -n
   echo "done"
   ;;
 stop)
   echo -n "Stopping syslogd/klogd: "
   start-stop-daemon -K -n syslogd
   start-stop-daemon -K -n klogd
   echo "done"
   ;;
 restart)
   $0 stop
   $0 start
   ;;
 *)
   echo "Usage: syslog { start | stop | restart }" >&2
   exit 1
   ;;
esac

exit 0

似乎 /var/log/ 目錄在啟動時被重定向到 /var/volatile/log/ ，它作為 tempfs 掛載，因此數據不會在重啟/崩潰時保存。註釋掉 /etc/fstab 文件中將 /var/volatile/ 目錄掛載為 tmpfs 的行似乎有效。

引用自：https://unix.stackexchange.com/questions/338440