相关参考资料： http://man.cx/start-stop-daemon(8) http://cronolog.org/usage.html http://book.opensourceproject.org.cn/lamp/ruby/railscook/opensource/0596527314/i_0596527314_chp_13_sect_6.html
安装cronolog
cronolog是个简单的日志切分插件，常见的经典应用就是切分apache的单个庞大日志，按日期保存
安装：
-----------------------------------------------------------------------------
$ wget
http://cronolog.org/download/cronolog-1.6.2.tar.gz
$ tar xvzf cronolog-1.6.2.tar.gz
$ cd cronolog-1.6.2
$ ./configure --prefix=/usr/local
$ make
$ sudo make install
-----------------------------------------------------------------------------
查看装在哪儿了（which也要sudo权限那）：
which cronolog
简单测试
$ echo "This is a test." | /usr/bin/cronolog -o /var/log/www/%Y/access.%m-%d-%y.log
"-o" 命令才能创建文件 不加的话报错
ok！
为自己的web server编写自启动程序
没有扩展名的脚本文件cam-hello :
-----------------------------------------------------------------------------
#! /bin/sh
# example python daemon starter script
# based on skeleton from Debian GNU/Linux
# cliechti@gmx.net
# place the daemon scripts in a folder accessible by root. /usr/local/sbin is a good idea
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
DAEMON="/usr/local/hello/python_server/HelloServer"
NAME=cam-hello
DESC="cam hello"
CRONOLOG="/usr/local/sbin/cronolog /var/log/www/cam/%Y/access.%m-%d-%y.log"
test -f $DAEMON || exit 0
set -e
export PIDFILE=/var/run/${NAME}.pid
case "$1" in
start)
echo -n "Starting $DESC: "
start-stop-daemon --start --make-pidfile --pidfile ${PIDFILE} --exec "$DAEMON" | $CRONOLOG &
;;
stop)
echo -n "Stopping $DESC: "
start-stop-daemon --stop --pidfile ${PIDFILE} | $CRONOLOG
# \ --exec $DAEMON
echo "$NAME."
if [ -f ${PIDFILE} ]; then
rm ${PIDFILE}
fi
### rest of shutdown ###
exit 0
;;
#reload)
#
# If the daemon can reload its config files on the fly
# for example by sending it SIGHUP, do it here.
#
# If the daemon responds to changes in its config file
# directly anyway, make this a do-nothing entry.
#
# echo "Reloading $DESC configuration files."
# start-stop-daemon --stop --signal 1 --quiet --pidfile \
# /var/run/$NAME.pid --exec $DAEMON
#;;
restart|force-reload)
#
# If the "reload" option is implemented, move the "force-reload"
# option to the "reload" entry above. If not, "force-reload" is
# just the same as "restart".
#
echo -n "Restarting $DESC: "
start-stop-daemon --stop --pidfile ${PIDFILE}
# --exec $DAEMON
sleep 1
start-stop-daemon --start --make-pidfile --pidfile ${PIDFILE} --exec $DAEMON | $CRONOLOG &
echo "$NAME."
;;
*)
N=/etc/init.d/$NAME
# echo "Usage: $N {start|stop|restart|reload|force-reload}" >&2
echo "Usage: $N {start|stop|restart|force-reload}" >&2
exit 1
;;
esac
exit 0
-----------------------------------------------------------------------------
--make-pidfile 才能建立自启动文件，被网上不完善程序误导，导致只能启动不能停止服务 ==！
python脚本需更改为可执行文件 不然无法运行
日志文件有个缓冲，达到一定长度才能写入，很无语（实验时候还以为python不能这么弄。。。。）
部署自启动程序
拷贝到 /etc/rc.d/init.d/
修改脚本文件chmod 777 cam-hello
注册：
/etc/init.d# sudo update-rc.d cam defaults
如果要删除start/stop links 则：
sudo update-rc.d -f cam remove
（注： chkconfig --add autoruntest 添加服务 这个命令有错，不用它！
There is a loop between service apache2 and rsyslog if stopped）
部署成功后
/etc/init.d/cam-hello start
/etc/init.d/cam-hello restart
/etc/init.d/cam-hello stop
