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                                                        shell自动化脚本实战---备份
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数据库备份： 结合计划任务 MySQL、 Oracle
    网站备份： tar，异地保存--ftp、rsync
    一、数据库备份
    1.利用自带工具mysqldump 实现数据库分库备份

        分库备份：
        1> 如何获取备份的数据库列表

[root@localhost mysql-5.7.18]# DBS=`mysql -uroot -p'123456' -N -e 'show databases' | egrep -v "information_schema|mysql|performance_schema|sys"`
mysql: [Warning] Using a password on the command line interface can be insecure.
[root@localhost mysql-5.7.18]# echo $DBS

       2> 循环遍历

for db in $DBS
doecho 备份 $db
done

        3> 备份语句实现

[root@localhost ~]# mysqldump -uroot -p'123456' -B $db > $db.sql
优化:
[root@localhost ~]# mysqldump -uroot -p'123456' -B user > user_$(date +%F).sql
分库备份参考代码：
#!/bin/bash#define var
BAK_DIR=/backup/db
CMD_OPT="-uroot -p123456"
EX_DB="information_schema|mysql|performance_schema|sys"DBS=$(mysql ${CMD_OPT} -N -e 'show databases' | egrep -v ${EX_DB})# main program
[ -d ${BAK_DIR} ] || mkdir -p ${BAK_DIR}for db in $DBS
domysqldump ${CMD_OPT} -B $db > ${BAK_DIR}/${db}_$(date +%F).sql
done

2、分表

mysql -uroot -p'123456' -N -e 'show tables from user'#!/bin/bash#define var
BAK_DIR=/backup/db
CMD_OPT="-uroot -p123456"
db=user
TABS=$(mysql ${CMD_OPT} -N -e "show tables from $db")# main program
[ -d ${BAK_DIR}/$db ] || mkdir -p ${BAK_DIR}/$dbfor tab in $TABS
do
mysqldump ${CMD_OPT} $db $tab > ${BAK_DIR}/$db/${db}_$tab_$(date +%F).sql

3、分库分表

#define var
BAK_DIR=/backup/db
CMD_OPT="-uroot -p123456"
EX_DB="information_schema|mysql|performance_schema|sys"DBS=$(mysql ${CMD_OPT} -N -e 'show databases' | egrep -v ${EX_DB})for db in $DBS
doTABS=$(mysql ${CMD_OPT} -N -e "show tables from $db")[ -d ${BAK_DIR}/$db ] || mkdir -p ${BAK_DIR}/$dbmysqldump ${CMD_OPT} -B $db > ${BAK_DIR}/${db}_$(date +%F).sqlfor tab in $TABSdomysqldump ${CMD_OPT} $db $tab > ${BAK_DIR}/$db/${db}_$tab_$(date +%F).sqldone
done

4.优化

优化：
#!/bin/bash#define var
BAK_DIR=/backup/db
CMD_OPT="-uroot -p123456"
EX_DB="information_schema|mysql|performance_schema|sys"DBS=$(mysql ${CMD_OPT} -N -e 'show databases' | egrep -v ${EX_DB})# main program
for db in $DBS
doTABS=$(mysql ${CMD_OPT} -N -e "show tables from $db")[ -d ${BAK_DIR}/$db ] || mkdir -p ${BAK_DIR}/$dbmysqldump ${CMD_OPT} -B $db | gzip > ${BAK_DIR}/$db/${db}_$(date +%F).sql.gz
# 分表备份
for tab in $TABSdomysqldump ${CMD_OPT} $db $tab | gzip > ${BAK_DIR}/$db/${db}_$tab_$(date +%F).sql.gzdone
done