MySQL定时备份数据库shell脚本

• mysqldump命令备份数据
• 整个shell脚本
• 使用crontab定期执行备份脚本

mysqldump命令备份数据

数据库导出，主要用到mysqldump 命令

mysqldump  -h$DB_HOST -u$DB_USER -p$DB_USER_PASSWD $dbname > $TODAYBACKUPPATH/$dbname.sql

整个shell脚本

具体脚本如下：

DB_HOST='localhost'
DB_USER='root'
DB_USER_PASSWD='***'
DB_NAME='/home/dbbackup/dbnames.txt'
BACKUP_PATH='/home/dbbackup/mysql/'

printf "createing backup folder!\n"
DATETIME=$(date +%Y%m%d_%H%M)
TODAYBACKUPPATH="$BACKUP_PATH$DATETIME"
#创建备份文件夹
if [ ! -d "$TODAYBACKUPPATH" ];
then
printf "create dir $TODAYBACKUPPATH \n"
mkdir -pv "$TODAYBACKUPPATH"
fi
printf "checking for databases names file\n"
#定义执行备份脚本，读取文件中的数据库名称，注意按行读写，不校验是否存在该库
run_backup (){
#读取 DB_NAME文件中的内容
for dbname in $(<$DB_NAME);do
#遍历循环执行备份sql
printf "now starting backup database %s\n" $dbname
printf "mysqldump -h$DB_HOST -u$DB_USER -p$DB_USER_PASSWD $dbname > $TODAYBACKUPPATH/$dbname.sql \n"
mysqldump  -h$DB_HOST -u$DB_USER -p$DB_USER_PASSWD $dbname > $TODAYBACKUPPATH/$dbname.sql
done
}

#执行压缩的函数
run_tar(){
# 将今日的备份文件打包成压缩文件
compress_file="$TODAYBACKUPPATH.tar.gz"
cd $BACKUP_PATH
pwd
tar -czvf $compress_file $DATETIME
printf "compress complete!\n"
#删除备份文件夹
rm -rf $TODAYBACKUPPATH
}
#删除30天前的文件
del_30day_backup_file(){
find ${BACKUP_PATH} -name "*.tar.gz" -mtime +30 -exec rm -rfv {} \;
}
_main(){
printf "starting backup of all db listed in file $DB_NAME \n"
printf "time is $DATETIME\n"
run_backup
run_tar
del_30day_backup_file
exit 0
}
_main

dbnames.txt中内容

脚本中的DB_HOST ，DB_USER_PASSWD，DB_NAME，BACKUP_PATH 根据情况自己更改。dbnames.txt 中一行只能有一个数据库名

使用crontab定期执行备份脚本

crontab 使用详解

crontab -e
#将下面这条脚本意思是 每天晚上23点50分钟时调用 /home/firm-pms/39.dump.sh 脚本
50 23 * * * /home/firm-pms/39.dump.sh >> /home/firm-pms/back_39_log.log

crontab -l 查看定时任务