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[MySQL-MM]生产环境自动恢复MM中一台M2库的过程,分享从零开始_MySQL

时间:2021-07-01 10:21:17 帮助过:22人阅读

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[MySQL-MM] 生产环境自动恢复MM中一台M2库的过程,分享从零开始写的自动化重建脚本以及思路

1 简介

有N0+组MM节点,如果每次都是手动修复,一次两次还好,次数多了难免有些无用功了,因为建立自动脚本,避免每次都在M库手动备份,手动copy,手动建立连接,手动设置复制信息的过程,我的目的,一个sh run command,所有的事情都准备妥当了,然后就泡一杯雀巢咖啡或者普洱茶,在一边静静的等待或者还可以借此小憩片刻,看着M2修复成功:

2 环境

必须是MM架构,而且一台主库M1是完好无损的,一台主库M2可以根据M1主库来进行重建;如果MS架构,自己可以稍微做一下脚本修改动作,也能使用,架构如下图所示:

3 总体思路,建立主脚本a_build_rep.sh

思路分为13个步骤,如a_build_rep.sh脚本中的备注

#!/bin/bash

set -x

set -e

set -u

#(1)准备好目录以及全局变量

BACKUP_FOLDER=/mysqldata/shared/backup2

TEMP_SETUP_FOLDER=/tmp/sharding_setup_1

MYSQL_EXEC=/opt/mysql/product/mysql/bin/mysql

#(2)设置参数,$1是要修复的M2库,$2是正在运行良好的M1库

db1=$2

db2=$1

#(3)在这里设置好一些所必用的环境变量,比如备份用户,备份用户密码,以及复制帐号密码,甚至一些super帐号

BACKUP_USER="backupuser"

BACKUP_PASSWORD="#xx$"

AGENT_PASSWORD='#xx$'

REPLICATION_USER=replication

REPLICATION_PASSWORD='#xx$'

REPLICA_PASSWORD='#xx$'

MONITOR_PASSWORD='#xx$'

WRITER_ETH='eth0'

SUPER_USER=backupuser

SUPER_PASSWORD='#xx$'

#(4)由于磁盘空间所限,建立这些目录,如果目录已经存在,则清空这些目录。

ssh -t $db1 "rm -rf $TEMP_SETUP_FOLDER && mkdir -p $TEMP_SETUP_FOLDER && chmod 777 $TEMP_SETUP_FOLDER"

ssh -t $db2 "rm -rf $TEMP_SETUP_FOLDER && mkdir -p $TEMP_SETUP_FOLDER && chmod 777 $TEMP_SETUP_FOLDER"

#(5)将在线备份脚本 create_hot_backup.sh copy到即将要进行在线备份的M1库上面,并且调用此脚本进行在线备份,此备份用来去另一个M2库上进行恢复。

echo "Taking hotbackup on db1..."

scp create_hot_backup.sh $db1:$TEMP_SETUP_FOLDER/create_hot_backup.sh

ssh -t $db1 "sudo -u mysql mkdir -p $BACKUP_FOLDER"

ssh -t $db1 "sudo -i -u mysql $TEMP_SETUP_FOLDER/create_hot_backup.sh '$BACKUP_FOLDER' '$BACKUP_USER' '$BACKUP_PASSWORD' N Y"

#(6)停止M2的MySQL服务

echo "Hotbackup completed. Now restore the hotbackup on db2..."

ssh -t $db2 "sudo /etc/init.d/mysql stop"

#(7)将restore_hot_backup.sh脚本copy到M2库上,并调用此脚本在M2库上面进行恢复操作。

scp restore_hot_backup.sh $db2:$TEMP_SETUP_FOLDER/restore_hot_backup.sh

ssh -t $db2 "sudo -i -u mysql $TEMP_SETUP_FOLDER/restore_hot_backup.sh '$BACKUP_FOLDER' '$BACKUP_USER' '$BACKUP_PASSWORD' '$TEMP_SETUP_FOLDER' Y"

#(8)恢复完,启动M2库。

ssh -t $db2 "sudo /etc/init.d/mysql start"

echo "Restore completed. Now rebuild replication between db1 and db2..."

#(9)建立M2上面的复制功能,M1为master,M2为slave;

echo "Setup replication from db1 to db2"

echo "Setup replication from db1 to db2"

scp $db2:$TEMP_SETUP_FOLDER/xtrabackup_binlog_info.master xtrabackup_binlog_info.db1

binlog_filename=`cat xtrabackup_binlog_info.db1 | awk '{print $1}'`

binlog_pos=`cat xtrabackup_binlog_info.db1 | awk '{print $2}'`

$MYSQL_EXEC -h$db2 -ummm_agent -p"$AGENT_PASSWORD" -e "SLAVE STOP;"

$MYSQL_EXEC -h$db2 -ummm_agent -p"$AGENT_PASSWORD" -e "CHANGE MASTER TO MASTER_HOST='$db1', MASTER_PORT=3306, MASTER_USER='replication', MASTER_PASSWORD='$REPLICATION_PASSWORD', MASTER_LOG_FILE='$binlog_filename', MASTER_LOG_POS=$binlog_pos;"

$MYSQL_EXEC -h$db2 -ummm_agent -p"$AGENT_PASSWORD" -e "SLAVE START;"

#(10)Check M2库的复制功能状态,是否搭建成功

echo "Check db2 replication status."

if ! $MYSQL_EXEC -h$db2 -ummm_agent -p"$AGENT_PASSWORD" -e "SHOW SLAVE STATUS/G" | grep "Slave_SQL_Running: Yes"

then

echo "[ERROR] Cannot start slave on db2!"

exit -1

fi

#(11)建立M1上面的复制功能,M2为master,M1为slave;

echo "Setup replication from db2 to db1"

./build_replication.sh $db2 $db1

#(12)Check M1库的复制功能状态,是否搭建成功

echo "Check db1 replication status."

if ! $MYSQL_EXEC -h$db1 -ummm_agent -p"$AGENT_PASSWORD" -e "SHOW SLAVE STATUS/G" | grep "Slave_SQL_Running: Yes"

then

echo "[ERROR] Cannot start slave on db1!"

exit -1

fi

#(13)清除临时目录的备份文件,释放磁盘空间

echo "Clean up the shared storage folder and tmp folder."

ssh -t $db1 "rm -rf $TEMP_SETUP_FOLDER"

ssh -t $db2 "rm -rf $TEMP_SETUP_FOLDER"

ssh -t $db1 "sudo -u mysql rm -rf $BACKUP_FOLDER"

echo 'Rebuild secondary done!'

4 分脚本(1),M1库上的在线备份脚本create_hot_backup.sh详情

#!/bin/bash

set -x

set -e

# !!! This file need to be run in mysql !!!

#(1)设置一些基本参数,$1:备份文件;$2:备份用户名;$3:备份用户名密码;$4:是否需要安全模式备份; $5:是否需要rsync信息

BACKUP_FOLDER=$1

HOTBACKUP_USER=$2

HOTBACKUP_PASSWORD=$3

NEED_SAFE_SLAVE=$4

NEED_RSYNC=$5

#(2)参数验证,如果需要,则在接下来的备份命令中加上--safe-slave-backup或者--rsync参数

INNOBACKUP_OPT=""

if [[ $NEED_SAFE_SLAVE == "Y" ]]

then

INNOBACKUP_OPT=$INNOBACKUP_OPT" --safe-slave-backup"

fi

if [[ $NEED_RSYNC == "Y" ]]

then

INNOBACKUP_OPT=$INNOBACKUP_OPT" --rsync"

fi

#(3)开始执行备份命令

echo "Run xtrabackup to take hotbackup..."

export MYSQL_HOME=/opt/mysql/product/mysql

innobackupex $INNOBACKUP_OPT --user=$HOTBACKUP_USER --password=$HOTBACKUP_PASSWORD $BACKUP_FOLDER

5 分脚本(2)restore_hot_backup.sh,在M2库上进行数据恢复操作。

#!/bin/bash

set -x

set -e

#(1)$1:备份数据存放的目录;$2:恢复用户;$3:恢复用户密码; $4:临时文件夹目录; $5:是否需要resync;

SHARED_STORAGE_PATH=$1

HOTBACKUP_USER=$2

HOTBACKUP_PASSWORD=$3

TEMP_SETUP_FOLDER=$4

NEED_RSYNC=$5

#(2)是否需要加上resync参数

INNOBACKUP_OPT=""

if [[ $NEED_RSYNC == "Y" ]]

then

INNOBACKUP_OPT="--rsync"

fi

#(3)把MYSQL_HOME放入环境变量中

export MYSQL_HOME=/opt/mysql/product/mysql

#(4)如果目录存在的话,删除这些数据库目录下的旧文件

echo "Delete existing mysql instance..."

rm -rf /mysqldata/data

rm -rf /mysqldata/shared/restore

rm -rf /mysqldata/binlog/*

rm -rf /mysqldata/iblogs/*

#(5)开始准备数据目录以及备份数据目录,如今不存在就新建,并且赋予linux系统帐号mysql的操作权限。

echo "Apply and copy back backup files..."

mkdir -p /mysqldata/data && chown -R mysql:mysql /mysqldata/data && chmod 700 /mysqldata/data

mkdir -p /mysqldata/shared/restore

backup_folder=$(ls -1 $SHARED_STORAGE_PATH | sort -rn | head -n1) #这个ls的找最新生成的文件的命令很实用,可以借鉴。

#(6)如果为了安全起见可以备份文件数据目录copy到指定的恢复临时目录,然后在临时目录进行--apply-log以及--copy-back等操作,但是我为了效率,就去掉了copy的时间(copy时间大概需要1小时左右),直接在原来的备份数据目录进行--apply-log以及--copy-back操作

# cp -r $SHARED_STORAGE_PATH/${backup_folder}/* /mysqldata/shared/restore/

# innobackupex --user=$HOTBACKUP_USER --password=$HOTBACKUP_PASSWORD --ibbackup xtrabackup --apply-log /mysqldata/shared/restore/

# innobackupex --user=$HOTBACKUP_USER --password=$HOTBACKUP_PASSWORD $INNOBACKUP_OPT --copy-back /mysqldata/shared/restore/

innobackupex --user=$HOTBACKUP_USER --password=$HOTBACKUP_PASSWORD --ibbackup xtrabackup --apply-log $SHARED_STORAGE_PATH/${backup_folder}/

innobackupex --user=$HOTBACKUP_USER --password=$HOTBACKUP_PASSWORD $INNOBACKUP_OPT --copy-back $SHARED_STORAGE_PATH/${backup_folder}/

#(7)将原来的备份中的复制点信息copy到临时目录下,并赋予对copy后的文件赋予相应的权限。

cp -f $SHARED_STORAGE_PATH/${backup_folder}/xtrabackup_binlog_info $TEMP_SETUP_FOLDER/xtrabackup_binlog_info.master

chmod 644 $TEMP_SETUP_FOLDER/xtrabackup_binlog_info.master

#(8)恢复成功后,删除原来的临时目录的备份数据,释放磁盘空间,如果你磁盘空间足够,这一步可以省略。

echo "Remove backup files..."

rm -rf $SHARED_STORAGE_PATH/${backup_folder}/

6 搭建M1上面的复制,M2为master,M1为slave,MM架构。

#!/bin/sh

set -x

set -u

set -e

#(1)$1:master主库服务器主机名或者IP地址; $2:slave主库服务器主机名或者IP地址;

MASTER_SERVER=$1

SLAVE_SERVER=$2

MYSQL_CNF_DIR='/opt/mysql/product/mysql/etc'

MYSQL_EXEC='/opt/mysql/product/mysql/bin/mysql'

#(2)从$1主库上面获取复制点信息

master_file=$(ssh -t $MASTER_SERVER "$MYSQL_EXEC -u$SUPER_USER -p$SUPER_PASSWORD -e 'SHOW MASTER STATUS/G'" | grep "File" | awk '{print $2}')

master_file=$(sed -e 's/[/r/n]//' <<<"$master_file")

master_pos=$(ssh -t $MASTER_SERVER "$MYSQL_EXEC -u$SUPER_USER -p$SUPER_PASSWORD -e 'SHOW MASTER STATUS/G'" | grep "Position" | awk '{print $2}')

master_pos=$(sed -e 's/[/r/n]//' <<<"$master_pos")

#(3)执行搭建复制sql命令操作:

ssh -t $SLAVE_SERVER "$MYSQL_EXEC -u$SUPER_USER -p$SUPER_PASSWORD -e /"

STOP SLAVE;

RESET SLAVE;

CHANGE MASTER TO master_host='$MASTER_SERVER', master_port=3306, master_user='$REPLICATION_USER',

master_password='$REPLICATION_PASSWORD', master_log_file='$master_file', master_log_pos=$master_pos;

START SLAVE;

/""

7 执行操作

在根目录下,执行

[root@xx-control xx]# nohup /home/cc/a_build_rep.sh m2.xx.com m1-.xx.com . > rebuild.log &,放在后台执行,使用nohup以防止屏幕突然失效。

然后用 tail -f rebuild.log 查看进展:

[root@xx-control xx]# tail -f rebuild.log

+ set -e

+ BACKUP_FOLDER=/mysqldata/shared/backup

Run xtrabackup to take hotbackup...

+ HOTBACKUP_USER=backupuser

+ HOTBACKUP_PASSWORD='#xxx$'

+ NEED_SAFE_SLAVE=N

+ NEED_RSYNC=Y

+ INNOBACKUP_OPT=

+ [[ N == /Y ]]

+ [[ Y == /Y ]]

+ INNOBACKUP_OPT=' --rsync'

+ echo 'Run xtrabackup to take hotbackup...'

+ export MYSQL_HOME=/opt/mysql/product/mysql

+ MYSQL_HOME=/opt/mysql/product/mysql

+ innobackupex --rsync --user=user'--password=#xxx$' /mysqldata/shared/backup

.................................................................................

................................................................................

Rebuild secondary done!

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