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分类: Mysql/postgreSQL

2011-04-12 16:16:22

Zmanda让MySQL的备份与恢复更加方便快捷灵活

ZRM() 是一个功能丰富的针对于MySQL数据库实施数据备份与恢复的开源工具,其中针对于MySQL数据库社区版的ZRM提供免费下载使用。

下面就来具体介绍ZRM的使用方法和一些注意事项。

工作环境:Fedora 7 + MySQL 5.0.45 + ZRM 2.1.1

安装ZRM: rpm -ivh  MySQL-zrm-2.1.1-1.noarch.rpm

rpm -ivh  perl-XML-Parser-2.36-1.el5.rf.i386.rpm   (ZRM需要的perl模块)

(NOTE: 相关安装文件可以在 的提示连接中下载。在安装zrm所需的两个模块perl-DBI和perl-XML-parser的时候折腾了半天,之前想通过CPAN去安装,但是后来发现都安装好了后,rpm去安装zrm的时候始终找不到perl-XML-parser这个模块,最后折腾半天还是安装上面连接中提示的地方下了一个rpm版的安装包,之后就没有问题了。)

使用前,我们先来整体了解下这个软件的整体结构,rpm安装好的zrm文件夹分布情况如下:

/etc/mysql-zrm目录下默认有4个文件mysql-zrm.conf (zrm配置文件)、mysql-zrm-reporter.conf 、mysql-zrm-release 、RSS.header。随着备份工作的展开这个目录下会自动生成一些备份文件夹,由参数–backup-set来定义(BackupSet1为默认文件夹的名字),每个文件夹下的last_backup文件中都会记录最近一次备份位置。

/var/lib/mysql-zrm/目录中是每次备份的具体数据对应文件的存放位置。

zrm

2. Backup

a.) 全备

逻辑备份: shell> mysql-zrm-backup –backup-set test –backup-level 0 –backup-mode logical –database test –tables employee

backup:INFO: ZRM for MySQL Community Edition - version 2.1.1
test:backup:INFO: START OF BACKUP
test:backup:INFO: PHASE START: Initialization
test:backup:INFO: The quick backup-type is supported only for snapshot backups. Setting backup-type to ‘regular’
test:backup:INFO: backup-set=test
test:backup:INFO: backup-date=20100319180120
test:backup:INFO: mysql-server-os=Linux/Unix
test:backup:INFO: backup-type=regular
test:backup:INFO: host=localhost
test:backup:INFO: backup-date-epoch=1268992880
test:backup:INFO: retention-policy=1D
test:backup:INFO: mysql-zrm-version=ZRM for MySQL Community Edition - version 2.1.1
test:backup:INFO: mysql-version=5.0.45-log
test:backup:INFO: backup-directory=/var/lib/mysql-zrm/test/20100319180120
test:backup:INFO: backup-level=0
test:backup:INFO: backup-mode=logical
test:backup:INFO: PHASE END: Initialization
test:backup:INFO: PHASE START: Running pre backup plugin
test:backup:INFO: PHASE END: Running pre backup plugin
test:backup:INFO: PHASE START: Flushing logs
test:backup:INFO: PHASE END: Flushing logs
test:backup:INFO: PHASE START: Creating logical backup
test:backup:INFO: logical-tables=employee
logical-databases=test
test:backup:INFO: PHASE END: Creating logical backup
test:backup:INFO: PHASE START: Calculating backup size & checksums
test:backup:INFO: next-binlog=mysql-bin.000005
test:backup:INFO: last-backup=/var/lib/mysql-zrm/test/20100319100944
test:backup:INFO: backup-size=0.01 MB
test:backup:INFO: PHASE END: Calculating backup size & checksums
test:backup:INFO: read-locks-time=00:00:00
test:backup:INFO: flush-logs-time=00:00:00
test:backup:INFO: backup-time=00:00:00
test:backup:INFO: backup-status=Backup succeeded
test:backup:INFO: Backup succeeded
test:backup:INFO: PHASE START: Running post backup plugin
test:backup:INFO: PHASE END: Running post backup plugin
test:backup:INFO: PHASE START: Mailing backup report
test:backup:INFO: PHASE END: Mailing backup report
test:backup:INFO: PHASE START: Cleanup
test:backup:INFO: PHASE END: Cleanup
test:backup:INFO: END OF BACKUP
You have new mail in /var/spool/mail/root

以上为执行后的输出信息,我们可以看到比较详细,有备份的路径以及执行情况,系统以及数据库的信息等。

shell> ls /var/lib/mysql-zrm/test/  (查看备份数据)

20100319180120  (NOTE: 生成一个以日期为文件夹名的目录。)

shell> ls /var/lib/mysql-zrm/test/20100319180120/

backup.sql  index  zrm_checksum

(NOTE: backup.sql— 数据库dump文件; index— 内容与上面的输出信息相同;zrm_checksum— 记录了本次操作的备份路径以及dump文件的校验码。)

物理备份: shell> mysql-zrm-backup –backup-set test –backup-level 0 –backup-mode raw –database test –tables employee

shell> ls /var/lib/mysql-zrm/test/20100319182600/

index  test  zrm_checksum

shell> ls /var/lib/mysql-zrm/test/20100319182600/test

employee.frm  employee.MYD  employee.MYI

(NOTE: 前后的两次差别,在于物理备份后,会产生一个对应的备份目录,里面是所备份表的相关物理文件。)

b.) 增量备份

shell> mysql-zrm-backup –backup-set test –backup-level 1 –backup-mode logical –database test –tables employee

shell> /var/lib/mysql-zrm/test/20100319183735

index  mysql-bin.000006  zrm_checksum

(NOTE: 增量与全备比较之后,我们会发现增备备份的是二进制文件。所以,我们也学会了如何自己去做增量备份。)

3. Restore

mysql> drop table employee;

shell> mysql-zrm-restore  –source-directory /var/lib/mysql-zrm/test/20100319180120 –databases test –user root -password eikenuat –host 192.168.11.172

restore:INFO: ZRM for MySQL Community Edition - version 2.1.1
BackupSet1:restore:INFO: Restored database(s) from logical backup:  test
BackupSet1:restore:INFO: Restore done in 0 seconds.

(NOTE: 上面没有错误信息,恢复成功,查看test库,发现已经employee表已经被恢复。)

4. 自动定时备份  (NOTE: 进行执行计划前,我们需要提前在配置文件mysql-zrm.conf中配置好所有的选项。)

shell> mysql-zrm-scheduler –add -interval daily –start 02:30    —- 每天凌晨2点半进行备份工作

schedule:INFO: ZRM for MySQL Community Edition - version 2.1.1
Logging to /var/log/mysql-zrm/mysql-zrm-scheduler.log
DONE

shell> mysql-zrm-scheduler –query    —- 查看备份计划任务

schedule:INFO: ZRM for MySQL Community Edition - version 2.1.1
Logging to /var/log/mysql-zrm/mysql-zrm-scheduler.log
35 13 * * * /usr/bin/zrm-pre-scheduler –action backup –backup-set BackupSet1 –backup-level 1 –interval daily

shell> mysql-zrm-scheduler –delete -interval daily –start 02:30     —- 删除计划任务

schedule:INFO: ZRM for MySQL Community Edition - version 2.1.1
Logging to /var/log/mysql-zrm/mysql-zrm-scheduler.log
1 crontab entry deleted
DONE

以上就是使用备份与恢复的一些基本操作。在ZRM的命令中有个有个mysql-zrm命令这个命令可以间接执行大部分的操作,比如,上面的命令还可以这样执行> mysql-zrm –action backup | restore … …

之前一直在用Xtrabackup这个备份工具,备份也还可以,就是当你要去回复的时候,就得自己动手把之前的备份文件放到要回复数据库的相应位置上去,稍微让我们感觉到一丝的不爽。当这周开始尝试使用ZRM后,觉得所有操作都是那么的和谐,一切都是那么轻松简单,就像10年前我们初次体验windows一样,敲敲点点的那个爽呀。ZRM也提供给我们远程备份异地数据库的实现,需要在远端的server上安装插件。其实,生产当中会有一个专门提供数据备份的server,上面安装好ZRM,然后在各个数据库sever上安装那个socket_copy插件,供ZRM连接使用。

不错吧,大家也试试吧。—– HAPPY WEEKEND & GOOD LUCK !

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