MySQL Cluster 备份与恢复

心已赠人 2022-06-17 06:39 55阅读 0赞

**在管理节点上进行备份**

ndb_mgm> start backup
    ndb_mgm> shutdown
    ndb_mgm> exit

**删掉SQL节点的数据**

DROP DATABASE TEST_CLUSTER;

**关闭MYSQLD服务器**

[root@localhost bin]# service mysqld stop
    Shutting down MySQL... SUCCESS!

**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

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 &

**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**

查看一下有没有数据，为了安全起见。

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    .

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