mysql数据库使用xtrabackup工具 实现备份和还原

Posted 2021-11-27

下载xtrabackup工具包

percona-xtrabackup-24-2.4.13-1.el7.x86_64.rpm 工具包可以从官网下载
https://www.percona.com/downloads/Percona-XtraBackup-LATEST/Percona-XtraBackup-8.0.4/binary/redhat/7/x86_64/percona-xtrabackup-80-8.0.4-1.el7.x86_64.rpm

安装xtrabackup工具包(需要启用epel源)

[[email protected] ~]# yum install -y percona-xtrabackup-24-2.4.13-1.el7.x86_64.rpm

一、实验：xtrabackup 实现完全备份和还原

备份过程

1）在原主机做完全备份到/backups

原主机上有mysql的hellodb表

MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| hellodb            |
| mysql              |
| performance_schema |
| test               |
+--------------------+
5 rows in set (0.01 sec)

使用xtrabackup 工具备份数据库

[[email protected] ~]# xtrabackup --backup --target-dir=/data/backup/ 

查看backup下已经生成了备份的文件

[[email protected] ~]#ls /data/backup/ -l 
total 18460
-rw-r----- 1 root root      431 May  6 22:32 backup-my.cnf
drwxr-x--- 2 root root      272 May  6 22:32 hellodb
-rw-r----- 1 root root 18874368 May  6 22:32 ibdata1
drwxr-x--- 2 root root     4096 May  6 22:32 mysql
drwxr-x--- 2 root root     4096 May  6 22:32 performance_schema
drwxr-x--- 2 root root       20 May  6 22:32 test
-rw-r----- 1 root root       21 May  6 22:32 xtrabackup_binlog_info
-rw-r----- 1 root root      113 May  6 22:32 xtrabackup_checkpoints
-rw-r----- 1 root root      468 May  6 22:32 xtrabackup_info
-rw-r----- 1 root root     2560 May  6 22:32 xtrabackup_logfile

xtrabackup_binlog_info、 xtrabackup_checkpoints、 xtrabackup_info文件里存放了备份时的信息

[[email protected] backup]#cat xtrabackup_binlog_info 
mysql-bin.000011    245
[[email protected] backup]#cat xtrabackup_checkpoints 
backup_type = full-backuped
from_lsn = 0
to_lsn = 1638757
last_lsn = 1638757
compact = 0
recover_binlog_info = 0
[[email protected] backup]#cat xtrabackup_info 
uuid = c65e06f6-700b-11e9-9ac5-000c2926023f
name = 
tool_name = xtrabackup
tool_command = --backup --target-dir=/data/backup/
tool_version = 2.4.13
ibbackup_version = 2.4.13
server_version = 5.5.60-MariaDB
start_time = 2019-05-06 22:32:26
end_time = 2019-05-06 22:32:28
lock_time = 0
binlog_pos = filename ‘mysql-bin.000011‘, position ‘245‘
innodb_from_lsn = 0
innodb_to_lsn = 1638757
partial = N
incremental = N
format = file
compact = N
compressed = N
encrypted = N

2）将备份的文件夹全部拷贝至目标主机

[[email protected] ~]# scp -r /data/backup/* 192.168.93.102:/data/backup

还原过程（在目标主机上 ）

1）预准备：确保数据一致，提交完成的事务，回滚未完成的事务

[[email protected] ~]# xtrabackup --prepare --target-dir=/data/backup/ 

2）复制到数据库目录

注意：数据库目录必须为空，MySQL服务不能启动

[[email protected] ~]# systemctl stop mariadb 
[[email protected] ~]# ls  /var/lib/mysql/ -l 
total 0
[[email protected] ~]#
[[email protected] ~]# xtrabackup --copy-back --target-dir=/data/backup/ 

3）还原属性

[[email protected] ~]# chown -R mysql:mysql /var/lib/mysql 

4）启动服务

[[email protected] ~]# systemctl start mariadb 

5）测试

[[email protected] ~]# mysql
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 2
Server version: 5.5.60-MariaDB MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.

MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| hellodb            |
| mysql              |
| performance_schema |
| test               |
+--------------------+
5 rows in set (0.01 sec)

二、实验：xtrabackup 实现增量备份和还原

备份过程

1）完全备份

[[email protected] ~]# xtrabackup --backup --target-dir=/data/backup/base

2）第一次修改数据

MariaDB [hellodb]> insert teachers (name,age)value(‘xiaoai‘,33);
MariaDB [hellodb]> show tables;
+-------------------+
| Tables_in_hellodb |
+-------------------+
| classes           |
| coc               |
| courses           |
| scores            |
| students          |
| teachers          |
| toc               |
+-------------------+
7 rows in set (0.00 sec)

MariaDB [hellodb]> drop table toc;
Query OK, 0 rows affected (0.01 sec)

3）第一次增量备份

[[email protected] ~]# xtrabackup --backup --target-dir=/data/backup/inc1 --incremental-basedir=/data/backup/base

4）第二次修改数据

MariaDB [hellodb]> update teachers set gender=‘F‘ where tid=5;`

5）第二次增量

[[email protected] ~]#xtrabackup --backup --target-dir=/data/backup/inc2 --incremental-basedir=/data/backup/inc1

6）将备份的数据库文件拷贝至远程主机

备份过程生成三个备份目录

[[email protected] ~]# ll /data/backup/
total 0
drwxr-x--- 6 root root 217 May  6 23:11 base
drwxr-x--- 6 root root 243 May  6 23:13 inc1
drwxr-x--- 6 root root 243 May  6 23:17 inc2

[[email protected] ~]# scp -r /data/backup/* 192.168.93.102:/data/backup

还原过程

在远程主机上确认是否复制成功

[[email protected] ~]# ll /data/backup/
total 0
drwxr-x---. 6 root root 217 May  6 15:19 base
drwxr-x---. 6 root root 243 May  6 15:19 inc1
drwxr-x---. 6 root root 243 May  6 15:19 inc2

1）预准备完成备份，此选项--apply-log-only 阻止回滚未完成的事务

[[email protected] ~]# xtrabackup --prepare --apply-log-only --target-dir=/data/backup/base

2）合并第1次增量备份到完全备份

[[email protected] ~]# xtrabackup --prepare --apply-log-only --target-dir=/data/backup/base --incremental-dir=/data/backup/inc1

3）合并第2次增量备份到完全备份

如果是最后一次增量备份，还原时不需要加选项--apply-log-only

[[email protected] ~]# xtrabackup --prepare  --target-dir=/data/backup/base --incremental-dir=/data/backup/inc2

4）复制到数据库目录

注意数据库目录必须为空，MySQL服务不能启动

[[email protected] ~]# xtrabackup --copy-back --target-dir=/data/backup/base

5）还原属性

[[email protected] ~]# chown -R mysql:mysql /var/lib/mysql

6）启动服务

[[email protected] ~]# systemctl start mariadb

7）测试是否还原

MariaDB [hellodb]> select * from teachers;
+-----+---------------+-----+--------+
| TID | Name          | Age | Gender |
+-----+---------------+-----+--------+
|   1 | Song Jiang    |  45 | M      |
|   2 | Zhang Sanfeng |  94 | M      |
|   3 | Miejue Shitai |  77 | F      |
|   4 | Lin Chaoying  |  93 | F      |
|   5 | xiaoai        |  33 | F      |
+-----+---------------+-----+--------+
5 rows in set (0.00 sec)