自动化运维——MySQL备份脚本（二）

使用if语句编写MySQL备份脚本

 代码：

#!/bin/bash
#auro backup mysql db
#by steve yu 2019
#define backup path 

BAK_DIR=/data/backup/`date +%Y%m%d`
MYSQLUSR=root
MYSQLPW=Root123
MYSQLCMD=/usr/bin/mysqldump
#ne是代表not equals，$UID是代表用户，0为root用户
#这边时表示如果不是root用户，则退出
if [[ $UID -ne 0 ]];then
        echo "Must to be use root for exec Shell."
        exit
fi

if [[ ! -d $BAK_DIR ]];then
        mkdir -p $BAK_DIR
        echo -e "33[32mThe $BAK_DIR create successfully!33[0m"
else
        echo -e "33[32mThis $BAK_DIR is exists...33[0m"
fi

$MYSQLCMD -u$MYSQLUSR -p$MYSQLPW --all-databases > $BAK_DIR/backup.sql

if [[ $? -eq 0 ]];then

        echo -e "33[32mMysql backup successfully!33[0m"

else

        echo -e "33[32mMysql backup failed!33[0m"

fi

截图：

运行结果：

 sh -n 文件名，检查脚本有没有问题

crontab -e添加定时任务

0    0 * * * /bin/bash /root/auto_backup_mysql.sh >> /tmp/mysql_bak.log 2>&1

今日作业，修改上脚本，使得mysql当天不备份2次

修改后bash脚本

BAK_DIR=/data/backup/`date +%Y%m%d`
MYSQLUSR=root
MYSQLPW=Root123
MYSQLCMD=/usr/bin/mysqldump
#ne是代表not equals，$UID是代表用户，0为root用户
#这边时表示如果不是root用户，则退出
if [[ $UID -ne 0 ]];then
        echo "Must to be use root for exec Shell."
        exit
fi

if [[ ! -d $BAK_DIR ]];then
        mkdir -p $BAK_DIR
        echo -e "33[32mThe $BAK_DIR create successfully!33[0m"
else
        echo -e "33[32mThis $BAK_DIR is exists...33[0m"
fi

if [[ ! -f $BAK_DIR/backup.sql ]];then
        $MYSQLCMD -u$MYSQLUSR -p$MYSQLPW --all-databases > $BAK_DIR/backup.sql
        if [[ $? -eq 0 ]];then
                echo -e "33[32mMysql backup successfully!33[0m"
        else
                echo -e "33[32mMysql backup failed!33[0m"
        fi
else
        echo -e "33[32mToday is already backuped33[0m"
fi