root@thrack-vdr:/tmp# cat /etc/init.d/rc.local
#! /bin/sh
### BEGIN INIT INFO
# Provides: rc.local
# Required-Start: $remote_fs
# Required-Stop:
# Default-Start: 2 3 4 5
# Default-Stop:
# Short-Description: Run /etc/rc.local if it exist
### END INIT INFO
PATH=/sbin:/usr/sbin:/bin:/usr/bin
. /lib/init/vars.sh
. /lib/lsb/init-functions
do_start() {
if [ -x /etc/rc.local ]; then
[ "$VERBOSE" != no ] && log_begin_msg "Running local boot scripts (/etc/rc.local)"
/etc/rc.local >> /tmp/rc.local.log 2>&1
ES=$?
[ "$VERBOSE" != no ] && log_end_msg $ES
return $ES
fi
}
case "$1" in
start)
do_start
echo "rc_local_started" >> /tmp/rc.local.log
;;
restart|reload|force-reload)
echo "Error: argument '$1' not supported" >&2
exit 3
;;
stop)
;;
*)
echo "Usage: $0 start|stop" >&2
exit 3
;;
esac
root@thrack-vdr:/tmp# cat /etc/rc.local
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.
#/bin/mount /dev/sda1 /mnt/diskc
#/bin/mount /dev/sda5 /mnt/diskd
#/bin/mount -t smbfs -o username=root,password= //192.168.50.101/thrackvdr /mnt/vdrsmb
set -x
set > /tmp/rc_local_env.log
echo "bbbbbb" >> /tmp/rc.local.log
/opt/openvpn/sbin/openvpn --config /opt/openvpn/etc/client.ovpn >> /opt/openvpn/logs/client.log 2>&1 &
echo "cccc" >> /tmp/rc.local.log
exit 0
root@thrack-vdr:/tmp#
root@thrack-vdr:/tmp# reboot
来自root@thrack-vdr的广播信息
(/dev/pts/0) at 19:59 ...
系统现在开始为了 reboot 关机
root@thrack-vdr:/tmp#
root@thrack-vdr:/tmp# cat /tmp/rc_local_env.log
IFS='
'
OPTIND='1'
PATH='/sbin:/usr/sbin:/bin:/usr/bin'
PPID='2442'
PREVLEVEL='N'
PS1='# '
PS2='> '
PS4='+ '
PWD='/'
RUNLEVEL='2'
SPLASH_ORIG_CONSOLE='8'
TERM='linux'
UPSTART_EVENT='runlevel'
UPSTART_JOB='rc2'
UPSTART_JOB_ID='6'
VERBOSE='no'
previous='N'
runlevel='2'
root@thrack-vdr:/tmp#
root@thrack-vdr:/tmp# cat /tmp/rc.local.log
+ set
+ echo bbbbbb
bbbbbb
+ echo cccc
cccc
+ exit 0
rc_local_started
root@thrack-vdr:/tmp#
可以看到,/etc/rc.local中，仅执行了echo ,set 等命令， 启动VPN那段，根本就没出现，怪异吧:)
折腾了几个小时，重启N次，加了N多断点echo，不灵光啊：）
无奈灵光一现，发现 /etc/rc.local bash 参数 !/bin/sh -e , 是不是有古怪？
查-e，查bash，呵呵，居然找到这个dash了
root@thrack-vdr:/tmp# ll /bin/sh
lrwxrwxrwx 1 root root 4 2009-09-13 19:53 /bin/sh -> dash
root@thrack-vdr:/tmp#
发现不是bash，有嫌疑,google了一把，改成bash看下
root@thrack-vdr:/tmp# sudo dpkg-reconfigure dash
正在删除 “diversion of /bin/sh to /bin/sh.distrib by dash”
正在删除 “diversion of /usr/share/man/man1/sh.1.gz to /usr/share/man/man1/sh.distrib.1.gz by dash”
root@thrack-vdr:/tmp# reboot
来自root@thrack-vdr的广播信息
(/dev/pts/0) at 20:02 ...
系统现在开始为了 reboot 关机
root@thrack-vdr:/tmp# cat /tmp/rc.local.log
+ set
+ echo bbbbbb
bbbbbb
+ /opt/openvpn/sbin/openvpn --config /opt/openvpn/etc/client.ovpn
+ echo cccc
cccc
+ exit 0
rc_local_started
root@thrack-vdr:/tmp#
这下一切正常了：）
备注：
root@thrack-vdr:~# set |grep SHELL=/bin/bash
SHELL=/bin/bash
root@thrack-vdr:~#
表明用户登录（终端，ssh等）后默认的shell是bash来的，故在终端执行那个启动vdpn的脚本都正常。
