mysql备份脚本-mysqldump

背景：全库备份

备份流程：

　　1.生成DB列表，将DB名字写入文件

　　2.定义备份函数，结果写入SQL文件

　　3.压缩文件，减少磁盘占用量

　　4.设置保留天数，定期删除n天之前的

　　5.通过for循环读取DB列表文件，依次进行mysqldump

#!/bin/bash

PORT='5001'
PASSWD='admin'
SOCKED="/data/socket/mysql${PORT}.sock"
BACKUP_FILE='/data/mysqlData/backup'
BACKUP_SAVE_DAYS='2'

CMD1='show databases;'
Time=`date +%Y%m%d_%H%M%S`
EVERY_DAY_BACKUP_DIR="${BACKUP_FILE}/${Time}_backup"
DB_LIST="${EVERY_DAY_BACKUP_DIR}/db_list.txt"

# function : check_db ===> db_list.txt
check_db()
{
    mkdir -pv ${EVERY_DAY_BACKUP_DIR} >>/dev/null
    touch ${DB_LIST} && chmod 755 ${DB_LIST} && chown -R mysql.mysql ${DB_LIST}
    /usr/local/mysql/bin/mysql -uadmin -p${PASSWD} -S ${SOCKED} -NBe"${CMD1}"|grep -v 'information_schema|performance_schema|mysql'>${DB_LIST}

}

# function : backup_db ===>xx.sql
backup_db()
{
    /usr/local/mysql/bin/mysqldump -uadmin -p${PASSWD} -S ${SOCKED} $1 >> ${EVERY_DAY_BACKUP_DIR}/$1.sql
}

# function : tar_file ===>xx.tar.gz
tar_file()
{
    cd ${BACKUP_FILE} 
    tar -cf `date +%Y%m%d_%H%M%S`.tar.gz ${Time}_backup
    rm -fr ${Time}_backup
}

# function : delete xx.tar.gz : <before n days>
delete_file()
{
    cd ${BACKUP_FILE}
    /usr/bin/find -name "*.tar.gz" -mtime +${BACKUP_SAVE_DAYS} -exec rm {} ;
}

# main_process
# 1
check_db

# 2
cat ${DB_LIST}| while read line
do 
    oldIFS=${IFS}
    backup_db ${line}
    IFS=${oldIFS}
    sleep 20
done

# 3 
tar_file

# 4 delete xx.tar.gz : before n days

delete_file ${BACKUP_SAVE_DAYS}