MySQL Cluster 备份与恢复

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<b>service mysqld start</b>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：

[root@node239 ndb_6_fs]# /usr/local/mysql/bin/ndb_restore -n6 -b1 -r -d --backup_path=/usr/local/mysql/data/BACKUP/BACKUP-1/                                                                                                                
Nodeid = 6
Backup Id = 1
backup path = /usr/local/mysql/data/BACKUP/BACKUP-1/
Ndb version in backup files: Version 5.1.21
Connected to ndb!!
_____________________________________________________
Processing data in table: sys/def/NDB$EVENTS_0(1) fragment 3
_____________________________________________________
Processing data in table: mysql/def/NDB$BLOB_2_3(3) fragment 3
_____________________________________________________
Processing data in table: sys/def/SYSTAB_0(0) fragment 3
_____________________________________________________
Processing data in table: mysql/def/ndb_schema(2) fragment 3
_____________________________________________________
Processing data in table: mysql/def/ndb_apply_status(4) fragment 3
_____________________________________________________
Processing data in table: test/def/t11(10) fragment 3
Restored 20 tuples and 0 log entries

NDBT_ProgramExit: 0 - OK



-d 开关的意思即：
 -d, --no-restore-disk-objects 
                      Dont restore disk objects (tablespace/logfilegroups etc)
既忽略表空间和分组空间

异常：
[root@localhost ~]# ndb_restore -n2 -b2 -r -m --backup_path=/var/lib/mysql-cluster/BACKUP/BACKUP-2
Nodeid = 2
Backup Id = 2
backup path = /var/lib/mysql-cluster/BACKUP/BACKUP-2
Opening file '/var/lib/mysql-cluster/BACKUP/BACKUP-2/BACKUP-2.2.ctl'
Backup version in files: ndb-6.3.11 ndb version: mysql-5.1.37 ndb-7.0.8
Stop GCP of Backup: 0
Configuration error: Error : Could not alloc node id at 192.168.8.120 port 1186: Connection done from wrong host ip 192.168.8.121.
Failed to initialize consumers

NDBT_ProgramExit: 1 - Failed
解决：管理节点配置文件添加
[mysqld]
//空节点