[原创]MYSQL集群的备份与恢复最终版本
中午刚刚弄明白了MYSQL集群的备份与恢复。
写下来，以后就不用为这个问题浪费时间了。
1、在管理节点上进行备份。
ndb_mgm> start backup nowait
ndb_mgm> Node 3: Backup 4 started from node 1
Node 3: Backup 4 started from node 1 completed
StartGCP: 43010 StopGCP: 43013
#Records: 2138 #LogRecords: 0
Data: 53068 bytes Log: 0 bytes

ndb_mgm> shutdown
Node 3: Cluster shutdown initiated
Node 4: Cluster shutdown initiated
Node 4: Node shutdown completed.
Node 3: Node shutdown completed.
2 NDB Cluster node(s) have shutdown.
Disconnecting to allow management server to 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]# /usr/local/mysql/ndb_mgmd -f /etc/config.ini
[root@localhost data]# /usr/local/mysql/bin/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
Starting MySQL SUCCESS!
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 da