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Syslog 在 200k 大小后覆盖日志文件

tag-icon • tag-icon logs embedded syslog busybox
Syslog 在 200k 大小后覆盖日志文件

我在 TI-J7 嵌入式板上运行 Linux。它使用 busybox 的 syslogd。但我面临的 syslog 问题是，当日志文件大小超过 200kb 时，它会覆盖日志文件，因此无法收集更多日志。 （当达到 200k 时，日志文件将被截断，并且 syslog 的新日志将写入同一文件）

我确信它没有被 logrotate 轮换，因为我还没有配置 logrotate 并且 /etc/logrotate.conf 中没有基于大小的轮换配置

以下是/etc/syslog.conf

#  /etc/syslog.conf     Configuration file for busybox's syslogd utility

以下是/etc/syslog-startup.conf

# /etc/init.d/syslog[.busybox] to set syslog configuration at start time.

DESTINATION=file                # log destinations (buffer file remote)
#LOGFILE=/var/log/messages      # where to log (file)
LOGFILE=/opt/vision_apps/log.log        # 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=0                   # 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=5                     # local log level (between 1 and 8)

以下是/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

waitpid ()
{
  pid=$1
  # Give pid a chance to exit before we restart with a 5s timeout in 1s intervals
  if [ -z "$pid" ]; then
    return
  fi
  timeout=5;
  while [ $timeout -gt 0 ]
  do
    timeout=$(( $timeout-1 ))
    kill -0 $pid 2> /dev/null || break
    sleep 1
  done
}

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)
  pid1=`pidof syslogd`
  pid2=`pidof klogd`
  $0 stop
  waitpid $pid1
  waitpid $pid2
  $0 start
  ;;
  *)
  echo "Usage: syslog { start | stop | restart }" >&2
  exit 1
  ;;
esac

exit 0

答案1

由于您是/etc/syslog-startup.conf在 syslog 启动文件中获取该文件：/etc/init.d/syslog但在其中您传递了两个参数ROTATESIZE，并且ROTATEGENS当这些参数未设置为：

if [ -n "$ROTATESIZE" ]; then
        SYSLOG_ARGS="$SYSLOG_ARGS -s $ROTATESIZE"
fi
if [ -n "$ROTATEGENS" ]; then
        SYSLOG_ARGS="$SYSLOG_ARGS -b $ROTATEGENS"

这意味着当系统日志启动时，空值将传递到这些参数中。

你需要做的是在未设置时设置一个固定值，如下所示（当 200K 和 4 个旋转文件时旋转）：

if [ -n "$ROTATESIZE" ]; then
        SYSLOG_ARGS="$SYSLOG_ARGS -s 200"
fi
if [ -n "$ROTATEGENS" ]; then
        SYSLOG_ARGS="$SYSLOG_ARGS -b 4"

...或将所有更改[ -n $variable ]为[ ! -n $variable ]AND 注释掉中的这些参数（以及其他参数）ROTATESIZE，然后当它为非空值时，它将从启动配置文件中读取并设置这些值。ROTATEGENS/etc/syslog-startup.conf

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