Mysql自动备份脚本

Mysqldump自动备份脚本，基于shell脚本，加入crontab定时任务。

Mysql Mysqldump 备份

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定时任务

crontab -e

30 02 * * * bash /home/mingliang.gao/crontab/db_backup/db_backup_task.sh > /dev/null 2>&1

备份脚本

db parameters

db相关的配置，可更改。

• db_user：账号
• db_passwd：密码
• db_host：数据库服务器IP
• db_port：数据库端口
• db_backup_dir：备份数据库存放路径
• db_names：为要备份的数据库名称，如果不设置指定的备份数据库，直接注释，在下面会把information_schema、mysql、performance_schem系统数据库除外的都进行备份。

dir parameters

备份数据的存放位置，以及记录备份历史，不可更改。

• cur_date：执行的本次日期。
• backup_history_file：执行记录文件。
• today_backup_dir：备份文件夹。

other parameters

设置备份数据保留天数。

• backup_keep_days：备份数据保留天数。
  任务脚本最下面有个find去处理保留的备份文件。

内容

#!/bin/bash

# ========================================================================================
# version: v.1.0
# author: mingliang.gao
# time: 2020/12/15 23:56:28
# mail: mingliang.gao@163.com
# summary: This script daily use to backup database
# crontab: 30 02 * * * bash /home/mingliang.gao/crontab/db_backup/db_backup_task.sh > /dev/null 2>&1
#
#           Enjoy the good lift everyday！！!
# ========================================================================================

echo "***************************************************"
echo "-------------Server Host: 121.4.56.169-------------"
echo "------------------DB start backup------------------"

# db parameters
db_user="mingliang.gao"
db_passwd="910809ecb44c92db12ad5fa369375d00"
db_host="127.0.0.1"
db_port=3306
db_backup_dir="/home/mingliang.gao/db_backup/"
db_names=""
db_names=(elt enterprise ht)   # config dbs

# base command
rm="$(which rm)"
find="$(which find)"
mkdir="$(which mkdir)"
touch="$(which touch)"

# dir parameters
cur_date="$(date +"%Y%m%d")"
backup_history_file="${db_backup_dir}backup_history.log"
today_backup_dir="${db_backup_dir}${cur_date}"
if [ ! -d "$today_backup_dir" ];then
    $mkdir -p "$today_backup_dir"
fi
if [ ! -e "$backup_history_file" ];then
    $touch "$backup_history_file"
fi

# other parameters
backup_keep_days=2
start_time="$(date +"%Y-%m-%d %H:%M:%S")"

# mysql command
mysql="$(which mysql)"
if [ $? -eq 0 ];
  then
    echo ""Mysql command: "$mysql"
  else
    echo "Not found mysql, exit."
    exit 1
fi
mysqldump="$(which mysqldump)"
if [ $? -eq 0 ];
  then
    echo ""Mysqldump command: "$mysqldump"
  else
    echo "Not found mysqldump, exit."
    exit 1
fi

if [ -z "$db_names" ]
  then
    db_names=$(mysql -h$db_host -P$db_port -u$db_user -p$db_passwd -e 'show databases'| grep -vE 'Database|information_schema|mysql|performance_schema')
fi

for db in ${db_names[*]}; do
  echo ""=============: "$db"
  $mysqldump -h$db_host -P$db_port -u$db_user -p$db_passwd $db > "${today_backup_dir}/${db}.sql"
done

# delete +3 db backup dir
$find $db_backup_dir -type d -mtime +$backup_keep_days -exec $rm -rf {} \;

# record history
end_time="$(date +"%Y-%m-%d %H:%M:%S")"
start_seconds=$(date --date="$start_time" +%s);
end_seconds=$(date --date="$end_time" +%s);
echo "${cur_date}: "$((end_seconds-start_seconds)) >> "$backup_history_file"

echo "${cur_date}本次运行时间： "$((end_seconds-start_seconds))"s"
echo "---------------Author: mingliang.gao---------------"
echo "-------------------DB end backup-------------------"
echo "***************************************************"
exit 0

Enjoy the good life everyday！！!