第十五步，使用LVS的快照功能创建快照，快照不需要格式化。
| [root@serv01 opt]# lvcreate -L 100M -s -n smydata /dev/data/mydata Logical volume "smydata" created |
第十六步，挂载
| [root@serv01 opt]# mount /dev/data/smydata /mnt [root@serv01 opt]# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda2 9.7G 2.4G 6.8G 27% / tmpfs 188M 0 188M 0% /dev/shm /dev/sda1 194M 25M 160M 14% /boot /dev/sda5 4.0G 161M 3.7G 5% /opt /dev/sr0 3.4G 3.4G 0 100% /iso /dev/mapper/data-mydata 2.0G 98M 1.8G 6% /usr/local/mysql/data /dev/mapper/data-smydata 2.0G 98M 1.8G 6% /mnt |
第十七步，模拟数据丢失和验证快照的数据不会受本身数据的影响
| [root@serv01 opt]# cd /mnt [root@serv01 mnt]# ls crm ib_logfile1 mysql-bin.000003 mysql-bin.000008 mysql-bin.000013 mysql-bin.index game larrydb mysql-bin.000004 mysql-bin.000009 mysql-bin.000014 performance_schema hello mysql mysql-bin.000005 mysql-bin.000010 mysql-bin.000015 serv01.host.com.err ibdata1 mysql-bin.000001 mysql-bin.000006 mysql-bin.000011 mysql-bin.000016 serv01.host.com.pid ib_logfile0 mysql-bin.000002 mysql-bin.000007 mysql-bin.000012 mysql-bin.000017 test #进入数据目录，创建一个文件 [root@serv01 ~]# cd /usr/local/mysql/data/ [root@serv01 data]# touch aa01.txt #进入快照挂载目录，发现没有这个文件 [root@serv01 mnt]# ls aa01.txt ls: cannot access aa01.txt: No such file or directory |
第十八步，备份数据
| [root@serv01 mnt]# cd /databackup/ [root@serv01 databackup]# ll total 976 -rw-r--r--. 1 root root 995761 Sep 10 17:47 mysql01.tar.gz [root@serv01 databackup]# /etc/init.d/mysqld status SUCCESS! MySQL running (2198) [root@serv01 databackup]# tar -cvzf mysql02.tar.gz /mnt [root@serv01 mnt]# rm -rf /usr/local/mysql/data/* [root@serv01 mnt]# /etc/init.d/mysqld stop ERROR! MySQL server PID file could not be found! [root@serv01 mnt]# pkill -9 mysql [root@serv01 mnt]# ps -ef | grep mysqld | grep grep -v [root@serv01 mnt]# cd /usr/local/mysql/data/ [root@serv01 data]# ll total 0 |
第十九步，恢复数据，启动数据库，登录MySQL，然后查看数据是否丢失
| [root@serv01 data]# tar -xvf /databackup/mysql02.tar.gz [root@serv01 data]# ls mnt [root@serv01 data]# cd mnt/ [root@serv01 mnt]# mv ./* ../ [root@serv01 mnt]# cd .. [root@serv01 data]# ls crm ib_logfile0 mysql mysql-bin.000004 mysql-bin.000008 mysql-bin.000012 mysql-bin.000016 serv01.host.com.err game ib_logfile1 mysql-bin.000001 mysql-bin.000005 mysql-bin.000009 mysql-bin.000013 mysql-bin.000017 serv01.host.com.pid hello larrydb mysql-bin.000002 mysql-bin.000006 mysql-bin.000010 mysql-bin.000014 mysql-bin.index test ibdata1 mnt mysql-bin.000003 mysql-bin.000007 mysql-bin.000011 mysql-bin.000015 performance_schema [root@serv01 data]# /etc/init.d/mysqld start Starting MySQL SUCCESS! [root@serv01 data]# mysql Welcome to the MySQL monitor. Commands end with ; or g. Your MySQL connection id is 1 Server version: 5.5.29-log Source distribution Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or 'h' for help. Type 'c' to clear the current input statement. mysql> use larrydb; Database changed mysql> select * from class; +------+--------+ | cid | cname | +------+--------+ | 1 | linux | | 2 | oracle | +------+--------+ 2 rows in set (0.00 sec) mysql> select * from stu; +------+---------+------+ | sid | sname | cid | +------+---------+------+ | 1 | larry01 | 1 | | 2 | larry02 | 2 | +------+---------+------+ 2 rows in set (0.00 sec) |
