Backup & Restore

Backup

Script#1:

#!/bin/bash

# 以下配置資訊請自己修改
mysql_user="USER" #MySQL 備份使用者
mysql_password="PASSWORD" #MySQL 備份使用者的密碼
mysql_host="localhost"
mysql_port="3306"
mysql_charset="utf8" #MySQL 編碼
backup_db_arr=("db1" "db2") #要備份的資料庫名稱，多個用空格分開隔開 如("db1" "db2" "db3")
backup_location=/var/www/mysql  #備份資料存放位置，末尾請不要帶"/"，此項可以保持預設，程式會自動建立資料夾
expire_backup_delete="ON" #是否開啟過期備份刪除 ON 為開啟 OFF 為關閉
expire_days=3 #過期時間天數 預設為三天，此項只有在 expire_backup_delete 開啟時有效

# 本行開始以下不需要修改
backup_time=`date +%Y%m%d%H%M`  #定義備份詳細時間
backup_Ymd=`date +%Y-%m-%d` #定義備份目錄中的年月日時間
backup_3ago=`date -d '3 days ago' +%Y-%m-%d` #3 天之前的日期
backup_dir=$backup_location/$backup_Ymd  #備份資料夾全路徑
welcome_msg="Welcome to use MySQL backup tools!" #歡迎語

# 判斷 MYSQL 是否啟動,mysql 沒有啟動則備份退出
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

# 連線到 mysql 資料庫，無法連線則備份退出
mysql -h$mysql_host -P$mysql_port -u$mysql_user -p$mysql_password <<end
use mysql;
select host,user from user where user='root' and host='localhost';
exit
end

flag=`echo $?`
if [ $flag != "0" ]; then
        echo "ERROR:Can't connect mysql server! backup stop!"
        exit
else
        echo "MySQL connect ok! Please wait......"
        # 判斷有沒有定義備份的資料庫，如果定義則開始備份，否則退出備份
        if [ "$backup_db_arr" != "" ];then
                #dbnames=$(cut -d ',' -f1-5 $backup_database)
                #echo "arr is (${backup_db_arr[@]})"
                for dbname in ${backup_db_arr[@]}
                do
                        echo "database $dbname backup start..."
                        `mkdir -p $backup_dir`
                        `mysqldump -h$mysql_host -P$mysql_port -u$mysql_user -p$mysql_password $dbname --default-character-set=$mysql_charset | gzip > $backup_dir/$dbname-$backup_time.sql.gz`
                        flag=`echo $?`
                        if [ $flag == "0" ];then
                                echo "database $dbname success backup to $backup_dir/$dbname-$backup_time.sql.gz"
                        else
                                echo "database $dbname backup fail!"
                        fi

                done
        else
                echo "ERROR:No database to backup! backup stop"
                exit
        fi
        # 如果開啟了刪除過期備份，則進行刪除操作
        if [ "$expire_backup_delete" == "ON" -a  "$backup_location" != "" ];then
                 #`find $backup_location/ -type d -o -type f -ctime +$expire_days -exec rm -rf {} \;`
                 `find $backup_location/ -type d -mtime +$expire_days | xargs rm -rf`
                 echo "Expired backup data delete complete!"
        fi
        echo "All database backup success! Thank you!"
        exit
fi

Restore

How to Restore Large MySQL Database

When we restore a large database, usually we come across two errors as shown below:  “MySQL server has gone away” & “Lost connection to MySQL server during query”

Here, we consider restoring a 16GB database:

When restoring huge database, we need to set the values as specified below:

• connect_timeout = 3600
• max_allowed_packet = 1024M
• net_buffer_length = 1000000
• wait_timeout = 86400 (which means 24 hours)
• interactive_timeout = 86400 (which means 24 hours)
• net_write_timeout = 3600
• net_read_timeout = 3600

mysql -u root -p -max_allowed_packet=1024M \
 -connect_timeout=3600 \
 -net_buffer_length=1000000 \
 -wait_timeout=86400 \
 -interactive_timeout=86400 \
 -net_write_timeout=3600 \
 -net_read_timeout=3600 \
 database-name < database.sql