新建一个lvm磁盘,这里我建的lv为mydatalv,挂载到了/data下
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[root@localhost ~] # lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert mydatalv mydata -wi-ao---- 1.00g [root@localhost ~] # df -h 文件系统 容量 已用 可用 已用% 挂载点 /dev/mapper/mydata-mydatalv 976M 2.6M 907M 1% /data |
将原数据库文件复制到/data目录下
[root@localhost ~]# cp -a /var/lib/mysql /data/
修改配置文件,将mysql数据库文件放在lvm盘中,二进制文件放在非lvm盘的/var/lib/mysql/目录下
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[root@ns1 ~] # vim /etc/my.cnf [mysqld] log_bin= /var/lib/mysql/mysql-bin datadir= /data/mysql [root@localhost ~] # service mariadb restart [root@localhost ~] # ls /data/mysql aria_log.00000001 ibdata1 ib_logfile1 mysql-bin.000001 mysql-bin.000003 performance_schema aria_log_control ib_logfile0 mysql mysql-bin.000002 mysql-bin.index test |
可以看到重启后数据库文件已存放在了/data/mysql目录中了
对mysql进行锁表备份
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[root@localhost ~] # mysql -e 'flush tables with read lock;' 锁表 [root@localhost ~] # mysql -e 'flush logs;' 对日志进行滚动, [root@localhost ~] # mysql -e 'show master status;' > /root/back.$(date +%F+%T) [root@localhost ~] # ls back.2016-07-13+10:14:29 |
对lv创建快照
[root@localhost ~]# lvcreate -L 1G -n mysqlback -p r -s /dev/mydata/mydatalv
释放锁
[root@localhost ~]# mysql -e 'unlock tables;'
在别的磁盘上创建备份目录,只读挂载快照后备份至备份目录
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[root@localhost ~] # mkdir /myback [root@localhost ~] # mount -r /dev/mydata/mysqlback /mnt [root@localhost ~] # cp -a /mnt/mysql /myback |
修改表内容,然后删除掉数据库文件内容即/data/mysql中的内容
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[root@localhost ~] # mysql MariaDB [hellodb]> use hellodb; MariaDB [hellodb]> insert into classes (class,numofstu) values ( 'xxoo' ,39); [root@localhost ~] # rm -rf /data/* |
修改配置文件中二进制日志和数据库文件的位置
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[root@localhost ~] # vim /etc/my.cnf [mysqld] log_bin= /data/mysql/mysql-bin datadir= /data/mysql |
利用/myback/中的内容还原
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[root@localhost ~] # cp -a /myback/* /data/ [root@localhost ~] # service mariadb restart |
利用二进制日志还原快照后的操作,由下面这个文件来查看快照执行时二进制日志的位置
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[root@localhost ~] # cat back.2016-07-13+10\:14\:29 File Position Binlog_Do_DB Binlog_Ignore_DB mysql-bin.000014 245 |
将000014中245之后的操作做成sql文件,进行还原
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[root@localhost ~] # mysqlbinlog --start-position=245 /var/lib/mysql/mysql-bin.000014 > binlog.sql [root@localhost ~] # mysql < /root/binlog.sql |
查看恢复情况
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[root@localhost ~] # mysql MariaDB [(none)]> use hellodb; MariaDB [hellodb]> select * from classes; +---------+----------------+----------+ | ClassID | Class | NumOfStu | +---------+----------------+----------+ | 1 | Shaolin Pai | 10 | | 2 | Emei Pai | 7 | | 3 | QingCheng Pai | 11 | | 4 | Wudang Pai | 12 | | 5 | Riyue Shenjiao | 31 | | 6 | Lianshan Pai | 27 | | 7 | Ming Jiao | 27 | | 8 | Xiaoyao Pai | 15 | | 9 | xxoo | 39 | +---------+----------------+----------+ 9 rows in set (0.00 sec) |