MySql定时备份脚本

shell脚本mysql_backup_test_backup.sh

#!/bin/bash
# 设置mysql的登录用户名和密码(根据实际情况填写)
mysql_user="***"
mysql_password="****"
mysql_host="localhost"
mysql_port="3306"
mysql_charset="utf8mb4"

# 备份文件存放地址(根据实际情况填写)
backup_location=/home/app/***/sql_backup

# 是否删除过期数据
expire_backup_delete="ON"
expire_days=7
backup_time=`date +%Y%m%d%H%M`
backup_dir=$backup_location
welcome_msg="Welcome to use MySQL backup tools!"

# 判断mysql实例是否正常运行
mysql_ps=`ps -ef |grep mysql |wc -l`
mysql_listen=`netstat -an |grep LISTEN |grep $mysql_port|wc -l`
if [ [$mysql_ps == 0] -o [$mysql_listen == 0] ]; then
        echo "ERROR:MySQL is not running! backup stop!"
        exit
else
        echo $welcome_msg
fi

# 备份指定数据库中数据(此处假设数据库是mysql_backup_test)
mysqldump -h$mysql_host -P$mysql_port -u$mysql_user -p$mysql_password -B mysql_backup_test> $backup_dir/mysql_backup_test-$backup_time.sql
flag=`echo $?`
if [ $flag == "0" ];then
        echo "database mysql_backup_test success backup to $backup_dir/mysql_backup_test-$backup_time.sql.gz"
else
        echo "database mysql_backup_test backup fail!"
fi

# 删除过期数据
find $backup_dir -name "$dataname-*.sql" -type f -mtime +$expire_days -exec rm -rf {} ; > /dev/null 2>&1`

编辑定时任务:

能够在我们导出数据的时候在我们的脚本⾥带上全量结束的position

--master-data=0|1|2

crontab -e
# 添加定时任务(每天12:50以及23:50执行备份操作)
50 12,23 * * * cd /home/app/jinxd/;sh mysql_backup_test_backup.sh >> log.txt 2>>log.txt

遇到的问题

1.定时任务执行失败

可能是自己安装的mysql，定时器找不到mysql的路径，mysqldump前面加上mysql的bin路径

/usr/local/mysql/bin/mysqldump -h$mysql_host -P$mysql_port -u$mysql_user -p$mysql_password -B $dataname> $backup_dir/$dataname-$backup_time.sql

2.定时器备份出来的时间不对，可能是定时器的时区不对

cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
service crond restart