MySQL Cluster 备份与恢复

1、在管理节点上进行备份。ndb_mgmgt; start backupndb_mgmgt; shutdownndb_mgmgt; exit2、删掉SQL节点的数据。 DROP DATAB

1、在管理节点上进行备份。
ndb_mgm> start backup
ndb_mgm> shutdown
ndb_mgm> exit
2、删掉SQL节点的数据。
DROP DATABASE TEST_CLUSTER;
3、关闭MYSQLD服务器。
[root@localhost bin]# service mysqld stop
Shutting down MySQL... SUCCESS!
4、重新顺序启动所有节点。
[root@localhost mysql]#ndb_mgmd -f /etc/config.ini --reload
[root@localhost data]#ndbd --initial
我发现如果不带这个 --initial选项的话，恢复会失败。
[root@localhost bin]# service mysqld start
//我用的7.0.8a版rpm 安装service mysqld start无法启动，用、、
//[root@localhost ~]# mysqld_safe &

4、在NDBD节点上进行恢复。（每个节点都得执行一次，，因为数据分散在两个节点上）
第一个节点：
[root@localhost BACKUP]# /usr/local/mysql/bin/ndb_restore -n3 -b4 -r -m --backup_path=/usr/local/mysql/data/BACKUP/BACKUP-4/
-r开关是记录集合。
-m是元数据。就是表和库的SCHEMA。
Nodeid = 3
Backup Id = 4
backup path = /usr/local/mysql/data/BACKUP/BACKUP-4/
Ndb version in backup files: Version 5.1.21
Connected to ndb!!
Successfully restored table `test_cluster/def/lk4_test`
...
Successfully created index `PRIMARY` on `lk4_test`
...
_____________________________________________________
Processing data in table: test_cluster/def/lk4_test54) fragment 1
_____________________________________________________
...
Restored 37 tuples and 0 log entries

NDBT_ProgramExit: 0 - OK
第二个节点：
[root@localhost BACKUP-1]# /usr/local/mysql/bin/ndb_restore -n4 -b4 -r --backup_path=/usr/local/mysql/data/BACKUP/BACKUP-4/
Nodeid = 4
Backup Id = 4
backup path = /usr/local/mysql/data/BACKUP/BACKUP-4/
Ndb version in backup files: Version 5.1.21
Connected to ndb!!
_____________________________________________________
Processing data in table: sys/def/NDB$EVENTS_0(1) fragment 1
_____________________________________________________
Processing data in table: mysql/def/ndb_apply_status(4) fragment 1
_____________________________________________________
Processing data in table: mysql/def/NDB$BLOB_2_3(3) fragment 1
_____________________________________________________
Processing data in table: test/def/t11(5) fragment 1
_____________________________________________________
Processing data in table: sys/def/SYSTAB_0(0) fragment 1
_____________________________________________________
Processing data in table: mysql/def/ndb_schema(2) fragment 1
Restored 2 tuples and 0 log entries

NDBT_ProgramExit: 0 - OK

这里完成。
5、查看一下有没有数据，为了安全起见。
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| test |
+--------------------+
3 rows in set (0.00 sec)
没有恢复的数据库？
MYSQL现在必须重新建立SCHEMA。

mysql> create database test_cluster;
Query OK, 1 row affected (0.33 sec)

mysql> use test_cluster;
Database changed
mysql> show tables;
+------------------------------+
| Tables_in_test_cluster |
+------------------------------+
| lk4_test |
| ... |
+------------------------------+
27 rows in set (0.11 sec)

mysql> select * from cs_comment;
Empty set (0.00 sec)

不过MYSQL的backup 程序现在还只能进行完全备份。
[root@localhost BACKUP]# du -h
76K ./BACKUP-2
96K ./BACKUP-6
180K ./BACKUP-4
172K ./BACKUP-3
76K ./BACKUP-1
60K ./BACKUP-5
668K .

6、在NDBD节点上进行恢复的时候有一个要注意的问题。
因为NDBD节点以 --initial 方式启动的时候不会自动删除undo 和 data 文件（即保存到磁盘上的表数据），所以得手动在每个NDBD节点上进行RM操作：

[root@node239 ndb_6_fs]# rm -rf *.dat

然后开始备份。
在MASTER上备份的时候要加 -m 开关。
在SLAVE上要加-d 而且不要-m开关。

具体步骤如下：
MASTER :

[root@localhost ndb_3_fs]# /usr/local/mysql/bin/ndb_restore -n3 -b1 -r -m --backup_path=/usr/local/mysql/data/BACKUP/BACKUP-1/
Nodeid = 3
Backup Id = 1
backup path = /usr/local/mysql/data/BACKUP/BACKUP-1/
Ndb version in backup files: Version 5.1.21
Connected to ndb!!
Creating logfile group: lg_1...done
Creating tablespace: ts_1...done
Creating datafile "data_1.dat"...done
Creating undofile "undo_1.dat"...done
Successfully restored table `test/def/t11`
Successfully restored table event REPL$test/t11
_____________________________________________________
Processing data in table: sys/def/NDB$EVENTS_0(1) fragment 0
_____________________________________________________
Processing data in table: mysql/def/NDB$BLOB_2_3(3) fragment 0
_____________________________________________________
Processing data in table: sys/def/SYSTAB_0(0) fragment 0
_____________________________________________________
Processing data in table: mysql/def/ndb_schema(2) fragment 0
_____________________________________________________
Processing data in table: mysql/def/ndb_apply_status(4) fragment 0
_____________________________________________________
Processing data in table: test/def/t11(10) fragment 0
Restored 26 tuples and 0 log entries

NDBT_ProgramExit: 0 - OK

其他的SLAVE上的操作：