日志备份脚本说明文档

• 时间：2017年9月23日
• 作者：MJ_DZ chen yuan
• 邮箱：chenyuan@ypmingjiang.cn
• 版本：4.0
• 描述：此脚本完成SD卡和U盘的备份。

脚本编写

脚本内容

#!/bin/bash
#==============================================================================
# Author           : MJ_DZ chenyuan
#
# Email            : cyysu.github.io@gmail.com
#
# Last modified    : 2017-08-27 15:53
#
# Filename         : backup.sh
#
# Description      : Backup /var/log/ files to the USB device and this Script
#                    will start at 6:00 pm to backup today log file. The script
#                    will backup All week and generate (1-7).tat.gz in the USB
#                    device. when the total log files greater than 100M,this
#                    scripts will delete the gateway's log files after backup
#                    this time.In the future ,we can submit this backup to our 
#                    server.
#==============================================================================
# make sure the backup directory
backupDir=/var/log
destDir=/opt/CacheUSB
countFile=/opt/.num.txt
device1="sdb1"
device2="sdc1"
device3="sdc1"
device4="sda1"
SD1="mmcblk0"
SD2="mmcblk1"
SD3="mmcblk2"
SD4="mmcblk4"
sdDir=/media/CacheSD
DATE=`date +"%Y-%m-%d"`
size1=100000
ISSD=0
ISUSB=0
# find usb device 
findUSB(){
    for device in `ls /dev/sd* | cut -d "/" -f 3`
    do
       if [ $? -eq 0 ];then
            if [[ $device == $device2 || $device == $device1 || $device == $device3 || $device == $device4 ]];then
                ISUSB=1
       	        if [ -e $destDir ];then
                    umount -fl $destDir
       	   		    mount /dev/$device $destDir
       	   		    echo -e "\033[41m `date`: mount usb device succes!!!\033[0m"
       	        else
       	   		    # device is find and the directory is not exist so create directory to mount device
           		    mkdir $destDir && mount /dev/$device $destDir
                    echo -e "\033[41m `date`: Create directory succes and mount usb device succes!!!\033[0m"
                 fi 
             fi
       fi
    done
}
# backup files to SD card
findSD(){
    for sd in `ls /dev/mmcblk* | cut -d "/" -f3`
    do
        if [ $? -eq 0 ];then
            if [[ $sd == $SD1 || $sd == $SD2 || $sd == $SD3 || $sd == $SD4 ]];then
                ISSD=1
                if [ -e $sdDir ];then
                    umount -fl $sdDir
                    mount /dev/$sd $sdDir
                    echo -e "\033[32m `date`: mount sd device succes!!!\033[0m"
                else
                    mkdir $sdDir && mount /dev/$sd $sdDir
                    echo -e "\033[32m `date`: Create directory succes and mount sd device succes!!!\033[0m"
                fi
            fi
        fi
    done
}
#statistic folders size 
FolderSize(){
    folderSize=`du -s ${backup} | cut -d "/" -f1 | cut -d "." -f1`
    echo $folderSize
    #test $folderSize -gt $size1 && echo yes
    if [ $folderSize -gt 150000 ];then
        echo -e "\033[41m `date`: The log folder's size is larger than 100M!!! The scripts will delete the log files \033[0m"
        #rm -rf $backupDir/*
    fi
}
# copy file from source to the destination 
CopyFilesFromSource(){
    cd $backupDir
	# package file to the destination directory and check if the log size is larger than 100M
	if [ $ISUSB -eq 1 ];then
         tar cvf $destDir/$DATE.tar ./*
    else
         tar cvf $sdDir/$DATE.tar ./*
    fi
    sync
    sync
    sync
}
# main function
main(){
    # find device
    findUSB 
    # check the system if exist usb device or sd device 
    if [ $ISUSB -eq 1 ];then
        echo -e "\033[32m `date`: usb device probe succes!!! System will not probe SD device!!! \033[0m"
    else
        echo -e "\033[41m `date`: usb device probe failed!!! System will  probe SD device!!! \033[0m"
        findSD
    fi
    # if usb exist and run this code funciton
    if [ $ISUSB -eq 1 ];then
	    if [[ -d $destDir && $? -eq 0 ]];then
		    # statistic run count and rename the backup file's name
		    #cd $destDir && echo "1" >> $countFile
	    	cd $destDir
            #BackupFileName=`awk '{print NR}' ${countFile} | tail -n1`
            #if [ ${BackupFileName} -eq 7 ];then
	    	#	cat /dev/null > $countFile  
            #fi
            #BackupFileName=$DATE
            #export BackupFileName
            # copy backup files current directory
            CopyFilesFromSource
            # because the backup is complete. if the scripts check the size is larger than 100M will delete /var/log/ all files
            FolderSize
        fi
    fi
    # if sd device exist and run this code funciton
    if [ $ISSD -eq 1 ];then
        if [[ -d $sdDir && $? -eq 0 ]];then
            CopyFilesFromSource
            FolderSize
        fi
    fi
}
# run start here
case "$1" in
  start)
	main
	;;
  stop)
	;;
  status)
	echo $?
    ;;
  *)
    echo "Usage autostart.sh [start|stop]" >&2
    exit 3
esac

脚本说明

此脚本实现了U盘和SD卡进行备份，详细的内容可以在脚本里面的注释。

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