Innobackupex全备数据库 - 数据库编程

对于MySQL数据库的热备，xtrabackup是除了MySQL enterprise backup之外的不二之选。该工具提供了基于innodb存储引擎的热备，支持全量，增量备份，部分备份，时点恢复以及使用xtrabackup备份来重做slave等。xtrabackup工具包包含一个innobackupex命令行工具，同时支持InnoDB引擎以及MyISAM引擎。本文主要描述的是trabackup的备份原理并给出了相关演示。

1、安装部署Xtrabackup
下载地址：http://www.percona.com/software/percona-xtrabackup

2、xtrabackup工作原理

3、extrabackup的备份步骤

4、演示全备

#当前环境
robin@localhost[(none)]> show variables like 'version';
+---------------+------------+
| Variable_name | Value      |
+---------------+------------+
| version       | 5.6.12-log |
+---------------+------------+

robin@localhost[(none)]> show variables like '%default_storage%';
+------------------------+--------+
| Variable_name          | Value  |
+------------------------+--------+
| default_storage_engine | InnoDB |
+------------------------+--------+

#全备数据库
[mysql@app ~]$ innobackupex --user=robin -password=xxx --port=3606 --socket=/tmp/mysql3606.sock \
> --defaults-file=/data/inst3606/data3606/my3606.cnf /data/bak/hotbak

InnoDB Backup Utility v1.5.1-xtrabackup; Copyright 2003, 2009 Innobase Oy
               ............
141105 15:41:59  innobackupex: Connecting to MySQL server with DSN 'dbi:mysql:;
                                  .............
innobackupex: Using mysql server version 5.6.12-log

innobackupex: Created backup directory /data/bak/hotbak/2014-11-05_15-42-02 #在指定备份目录下创建一个基于时间戳的文件夹

141105 15:42:02  innobackupex: Starting ibbackup with command: xtrabackup  --defaults-file="/data/inst3606/data3606/my3606.cnf" 
--defaults-group="mysqld" --backup --suspend-at-end --target-dir=/data/bak/hotbak/2014-11-05_15-42-02 
--tmpdir=/tmp --extra-lsndir='/tmp'
innobackupex: Waiting for ibbackup (pid=27441) to suspend
innobackupex: Suspend file '/data/bak/hotbak/2014-11-05_15-42-02/xtrabackup_suspended_2'

#下面从配置文件获取有关innodb的配置信息
xtrabackup version 2.2.5 based on MySQL server 5.6.21 Linux (x86_64) (revision id: )
xtrabackup: uses posix_fadvise().
xtrabackup: cd to /data/inst3606/data3606
xtrabackup: open files limit requested 0, set to 1024      # Author : Leshami
xtrabackup: using the following InnoDB configuration:      # Blog   : http://blog.csdn.net/leshami
xtrabackup:   innodb_data_home_dir = ./
xtrabackup:   innodb_data_file_path = ibdata1:10M:autoextend
xtrabackup:   innodb_log_group_home_dir = ./
xtrabackup:   innodb_log_files_in_group = 2
xtrabackup:   innodb_log_file_size = 50331648
>> log scanned up to (380655683)   #扫描innodb日志lsn并复制inndodb系统表空间
[01] Copying ./ibdata1 to /data/bak/hotbak/2014-11-05_15-42-02/ibdata1
>> log scanned up to (380655683)
>> log scanned up to (380655683)
[01]        ...done
[01] Copying ./mysql/slave_relay_log_info.ibd to /data/bak/hotbak/2014-11-05_15-42-02/mysql/slave_relay_log_info.ibd
            #类似部分省略，全部是基于innodb引擎的ibd文件...
[01] Copying ./tempdb/tb_user.ibd to /data/bak/hotbak/2014-11-05_15-42-02/tempdb/tb_user.ibd
[01]        ...done
>> log scanned up to (380655683)
xtrabackup: Creating suspend file '/data/bak/hotbak/2014-11-05_15-42-02/xtrabackup_suspended_2' with pid '27441'

141105 15:42:30  innobackupex: Continuing after ibbackup has suspended
141105 15:42:30  innobackupex: Executing FLUSH TABLES WITH READ LOCK... #缓冲写出到数据文件并锁表
141105 15:42:30  innobackupex: All tables locked and flushed to disk

141105 15:42:30  innobackupex: Starting to backup non-InnoDB tables and files #复制非innodb表及相关文件
innob

Innobackupex全备数据库(一)