Percona XtraBackup備份數據庫關於數據路徑默認選擇和show variables

Percona XtraBackup下載地址

https://www.percona.com/downloads/XtraBackup/LATEST/

Percona XtraBackup提供了xtrabackup和innobackupex兩個工具

1，xtrabackup只能備份InnoDB和XtraDB兩種數據表，而不能備份MyISAM數據表

2，innobackupex是參考了InnoDB Hotbackup的innoback腳本修改而來的.innobackupex是一個perl腳本封裝，封裝了xtrabackup。主要是爲了方便的 同時備份InnoDB和MyISAM引擎的表，但在處理myisam時須要加一個讀鎖。而且加入了一些使用的選項。如slave-info能夠記錄備份恢 復後，做爲slave須要的一些信息，根據這些信息，能夠很方便的利用備份來重作slave。

全數據庫備份：

[root@ms01 /backup ] # innobackupex --user=aolens --password=*** /backup/

 

Error: option 'datadir' has different values:

'.' in defaults file

'/usr/local/mysql/data/' in SHOW VARIABLES

報錯datadir默認是當前路徑，show variables是/usr/local/mysql/data

查看數據庫datadir的值：show global variables like '%datadir%'；

查看配置文件發現配置文件裏沒有datadir參數的定義，爲配置文件添加上datadir=/usr/local/mysql/data

[root@ms01 ~] # innobackupex --defaults-file=/etc/my.cnf --user=aolens --password=aolens /backup/

 

160113 11:08:55 innobackupex: Starting the backup operation

 

IMPORTANT: Please check that the backup run completes successfully.

At the end of a successful backup run innobackupex

prints "completed OK!" .

 

160113 11:08:55 version_check Connecting to MySQL server with DSN 'dbi:mysql:;mysql_read_default_group=xtrabackup;port=3306;mysql_socket=/tmp/mysql.sock' as 'aolens' (using password: YES).

160113 11:08:55 version_check Connected to MySQL server

160113 11:08:55 version_check Executing a version check against the server...

160113 11:08:55 version_check Done.

160113 11:08:55 Connecting to MySQL server host: localhost, user: aolens, password: set , port: 3306, socket: /tmp/mysql .sock

Using server version 5.5.29-log

innobackupex version 2.3.2 based on MySQL server 5.6.24 Linux (x86_64) (revision id : 306a2e0)

xtrabackup: uses posix_fadvise().

xtrabackup: cd to /usr/local/mysql/data

xtrabackup: open files limit requested 0, set to 1024

xtrabackup: using the following InnoDB configuration:

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 = 5242880

160113 11:08:55 >> log scanned up to (23706694302)

xtrabackup: Generating a list of tablespaces

160113 11:08:55 [01] Copying . /ibdata1 to /backup//2016-01-13_11-08-55/ibdata1

160113 11:08:56 >> log scanned up to (23706694560)

160113 11:08:56 [01] ... done

160113 11:08:57 >> log scanned up to (23706694560)

Executing FLUSH NO_WRITE_TO_BINLOG TABLES...

160113 11:08:57 Executing FLUSH TABLES WITH READ LOCK...

160113 11:08:57 Starting to backup non-InnoDB tables and files

 

...

 

160113 11:09:13 [00] ... done

160113 11:09:13 Executing FLUSH NO_WRITE_TO_BINLOG ENGINE LOGS...

xtrabackup: The latest check point ( for incremental): '23706694560'

xtrabackup: Stopping log copying thread.

.160113 11:09:13 >> log scanned up to (23706694560)

 

160113 11:09:13 Executing UNLOCK TABLES

160113 11:09:13 All tables unlocked

160113 11:09:13 Backup created in directory '/backup//2016-01-13_11-08-55'

MySQL binlog position: filename 'mysql-bin.000032' , position '286360161'

160113 11:09:13 [00] Writing backup-my.cnf

160113 11:09:13 [00] ... done

160113 11:09:13 [00] Writing xtrabackup_info

160113 11:09:13 [00] ... done

xtrabackup: Transaction log of lsn (23706693241) to (23706694560) was copied.

160113 11:09:13 completed OK!

備份成功

因此在使用xtrabackup時必定要注意，在配置文件裏寫上datadir的路徑，否則數據還原也會出錯。

單庫備份

1

[root@ms01 /backup ] # innobackupex --defaults-file=/etc/my.cnf --user=aolens --password=*** --database=recon /backup/

數據還原

提交未提交的數據

innobackupex --apply-log /backup/2016-01-13_11-08-55/

innobackup不支持離線備份，可是恢復無需啓動MySQL。

刪除數據目錄下的一個庫目錄。執行恢復。

[root@node2 data] # innobackupex --copy-back /backup/2016-01-13_11-08-55/

innobackupex: Error: Original data directory '/mydata/data' is not empty! at /usr/bin/innobackupex line 2163. #報錯數據目錄不爲空！

[root@node2 data] # rm -rf * #刪除數據目錄下的全部文件。

[root@node2 data] # innobackupex --copy-back /backup/2016-01-13_11-08-55/

innobackupex: Finished copying back files.

140909 02:58:36 innobackupex: completed OK!

修改恢復回來的數據的權限

chown -R mysql.mysql /usr/local/mysql/data

啓動mysql便可

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