#!/bin/sh
#Command:/usr/nginx/nginx/tools/clearNginxLog.sh
#Execute time: 00:00:00
LOGS_PATH=/usr/nginx/logs/nginx

#nginx pid path
PID=/usr/nginx/nginx/nginx.pid

#nginx logs save days
SAVE_DAYS=7

#backup data format
TODAY=$(date -d 'today' +%Y-%m-%d)
CURRENTTIME=$(date -d 'today' +%Y-%m-%d-%H-%M-%S)

logfile=$LOGS_PATH/clearNginxLog_${TODAY}.log

echo "`date +%Y-%m-%d` `date +%H-%M-%S` Start run the shell $0." >> ${logfile}
echo "Security check start." >> ${logfile}
if [ $LOGS_PATH == "/" ] || [ $LOGS_PATH == "/etc" ] || [ $LOGS_PATH == "/opt" ] || [ $LOGS_PATH == "/usr" ];then
  echo "Nginx logs path is not right!!!" >> ${logfile}
  exit 1;
fi

if [ -z "$LOGS_PATH" ];then
  echo "Nginx logs path is null!!!" >> ${logfile} 
  exit 1;
fi

if [ -z "$SAVE_DAYS" ];then
  SAVE_DAYS=7
fi
echo "Security check success." >> ${logfile}

echo "Move and rename logs start."
if [ -f ${LOGS_PATH}/error_${TODAY}.log.gz ];then
  TODAY=$CURRENTTIME
fi

if [ -f ${LOGS_PATH}/access_${TODAY}.log.gz ];then
  TODAY=$CURRENTTIME
fi

if [ -f ${LOGS_PATH}/host.access_${TODAY}.log.gz ];then
  TODAY=$CURRENTTIME
fi
echo "Move and rename logs finished."

#bak log files
mv ${LOGS_PATH}/host.access.log ${LOGS_PATH}/host.access_${TODAY}.log
mv ${LOGS_PATH}/error.log ${LOGS_PATH}/error_${TODAY}.log
mv ${LOGS_PATH}/access.log ${LOGS_PATH}/access_${TODAY}.log

#RESTART nginx process open file pid
kill -USR1 `cat ${PID}`

#Compress xxx.log to xxx.log.gz and auto remove xxx.log
if [ -f "/usr/bin/gzip" ];then
  gzip ${LOGS_PATH}/host.access_${TODAY}.log
  gzip ${LOGS_PATH}/error_${TODAY}.log
  gzip ${LOGS_PATH}/access_${TODAY}.log
fi
echo "Move and rename logs success." >> ${logfile}

echo "Command: find ${LOGS_PATH} -type f -mtime +{SAVE_DAYS} | xargs rm -f" >> ${logfile}
echo "clear files:" >> ${logfile}
find ${LOGS_PATH} -type f -mtime +${SAVE_DAYS} -print >> ${logfile}
find ${LOGS_PATH} -type f -mtime +${SAVE_DAYS} | xargs rm -f

echo "`date +%Y-%m-%d` `date +%H-%M-%S` End run the shell $0." >> ${logfile}
exit 0

3.1 上传shell脚本

• 创建脚本存放目录mkdir -p /usr/nginx/nginx/tools/
• 将shell脚本clearNginxLog.sh上传到Linux服务器的/usr/nginx/nginx/tools/目录下

3.2 手动验证shell脚本

• 进入脚本存放目录cd /usr/nginx/nginx/tools/
• 手动执行shell脚本sh clearNginxLog.sh
  
  

三、crond定时任务

3.3 crond定时服务

• 定时任务的作用是定时的去执行自定义好的clearNginxLog.sh脚本
• Linux定时执行脚本的方式有很多，这里使用crond服务来实现定时任务
• crond是Linux操作系统自带的定时服务，自带守护进程，一般用于运行计划任务如系统备份、日志分割及清理。
• crond服务适合在那些24x7不间断运行的机器如服务器上运行的计划任务。

3.4 配置crond任务

• crond表达式
  示例1：0 0 * * * 每天整点执行
  示例2：*/1 0 * * * 每隔一分钟执行
  –参数说明
  crond表达式从左右分别表示分钟(0-59)　小时(0-23)　日期(1-31)　月份(1-12)　星期(0-6,0代表星期天)

• 验证crond配置
  配置当前用户crond的执行命令/usr/bin/crontab -e
  修改指令内容为如下command指令，表示每分钟执行脚本，验证crond定时任务是否正常：
  */1 * * * * /bin/sh /usr/nginx/nginx/tools/clearNginxLog.sh

• 实时查看cron执行日志（这里只有root用户有权限查看~）
  tail -f /var/log/cron
  

• 修改crond定时任务为每日整点执行
0 0 * * * /bin/sh /home/nginx/tools/clearNginxLog.sh