采用xtrabackup部署主从同步(生产)

环境:

OS:Centos 7

DB:5.7.33

 

1.1 从库安装mysql

在从库上部署mysql，配置参数跟主库保持一致

 

1.2 安装xtrabackup

可以到官网下载安装介质

percona-xtrabackup-2.4.7-Linux-x86_64.tar.gz

 主从库上都需要进行安装

解压安装

[root@localhost soft]# tar -xvf percona-xtrabackup-2.4.7-Linux-x86_64.tar.gz

[root@localhost soft]# mv percona-xtrabackup-2.4.7-Linux-x86_64 /opt/xtrabackup247

 

 

1.3 主库创建同步账号

 

grant replication slave, replication client on *.*  to 'ureplsync'@'192.168.1.%' identified by 'mysql';

 

1.4 备份主库

 

 [root@host01 bin]# /opt/xtrabackup247/bin/innobackupex --defaults-file=/opt/mysql5733/conf/my.cnf --user=root --password=mysql -P13306 --socket=/opt/mysql5733/mysql.sock /opt/xtrabackup_file

 

这里的文件存储路径/opt/xtrabackup_file需要提前创建好,备份完成后,会有ok的提示

210410 09:15:53 Executing UNLOCK TABLES

210410 09:15:53 All tables unlocked

210410 09:15:53 [00] Copying ib_buffer_pool to /opt/xtrabackup_file/2021-04-10_09-15-22/ib_buffer_pool

210410 09:15:53 [00]        ...done

210410 09:15:53 Backup created in directory '/opt/xtrabackup_file/2021-04-10_09-15-22/'

MySQL binlog position: filename 'binlog.000004', position '1214', GTID of the last change 'fbf83c6c-9836-11eb-8ec4-52540051cd25:1-35'

210410 09:15:53 [00] Writing backup-my.cnf

210410 09:15:53 [00]        ...done

210410 09:15:53 [00] Writing xtrabackup_info

210410 09:15:53 [00]        ...done

xtrabackup: Transaction log of lsn (2798648) to (2798657) was copied.

210410 09:15:53 completed OK!

 

查看备份文件目录

[root@localhost xtrabackup_file]# ls -1 /opt/xtrabackup_file

2021-04-10_09-15-22

 

我们将该目录打包,传送到目标的机器上

[root@localhost xtrabackup_file]# tar -cvf 2021-04-10_09-15-22.tar ./2021-04-10_09-15-22

 [root@localhost xtrabackup_file]#scp 2021-04-10_09-15-22.tar root@目标机器ip:/tmp/

 

1.5 备库恢复

 

1.5.1     从库tar文件解压缩

[root@localhost xtrabackup_file]# cd /tmp/

[root@localhost tmp]# tar -xvf 2021-04-10_09-15-22.tar

 

 

1.5.2     停掉备库(之前有主备环境的情况下)

[root@localhost mysql5733_slave]# /opt/mysql5733_slave/bin/mysqladmin -h localhost -uroot -P23306 -pmysql -S /opt/mysql5733_slave/mysql.sock shutdown

 

1.5.3     备份data目录并创建新的data目录

[root@localhost mysql5733_slave]#cd /opt/mysql5733_slave

[root@localhost mysql5733_slave]# mv data bakdata

同时创建新的目录

[root@localhost mysql5733_slave]# mkdir data

 

1.5.4     删除redolog(看实际需要)

redo路径不是在data目录下才需要这步骤,可以查看备库参数innodb_log_group_home_dir

[root@localhost mysql5733_slave]# cd redolog

[root@localhost mysql5733_slave]# ls

ib_logfile0  ib_logfile1  ib_logfile2  ib_logfile3  ib_logfile4

[root@localhost mysql5733_slave]# rm *

rm: remove regular file ‘ib_logfile0’? y

rm: remove regular file ‘ib_logfile1’? y

rm: remove regular file ‘ib_logfile2’? y

rm: remove regular file ‘ib_logfile3’? y

rm: remove regular file ‘ib_logfile4’? y

  

1.5.5     恢复(备库也事先安装好xtrabackup软件)

 [root@localhost ]# /opt/xtrabackup247/bin/innobackupex --defaults-file=/opt/mysql5733_slave/conf/my.cnf --user=root --apply-log /tmp/2021-04-10_09-15-22

 完成后会有ok提示

 [root@localhost]# /opt/xtrabackup247/bin/innobackupex --defaults-file=/opt/mysql5733_slave/conf/my.cnf --user=root --copy-back --rsync /tmp/2021-04-10_09-15-22

 完成后会有ok提示

 

1.5.6     修改权限

[root@localhost /]# cd /opt/

[root@localhost opt]# chown -R mysql:mysql ./mysql5733_slave

 

1.5.7     启动从库

 [root@localhost opt]# su - mysql

[mysql@localhost ~]$ /opt/mysql5733_slave/bin/mysqld_safe --defaults-file=/opt/mysql5733_slave/conf/my.cnf --user=mysql &

 

1.6 主从同步

 

1.6.1     主库上创建同步账号(若已经创建则省略)

grant replication slave, replication client on *.*  to 'ureplsync'@'192.168.1.%' identified by 'mysql';

 

 

1.6.2     从库部署同步

change master to master_host='192.168.1.135',

       master_port=13306,

       master_user='ureplsync',

       master_password='mysql',

       master_log_file='binlog.000004',

       master_log_pos=1214;

 

找到主从同步的参数值

master_log_file和master_log_pos

这两个参数可以在xtrabackup备份目录下的文件中查找到

[root@localhost 2021-04-10_09-15-22]# more xtrabackup_binlog_info

binlog.000004   1214    fbf83c6c-9836-11eb-8ec4-52540051cd25:1-35

 

1.6.3     启动从库

mysql> start slave;

Query OK, 0 rows affected (0.02 sec)

 

1.6.4     查看同步情况

show slave status G;