Mysql Cluster水平扩展-添加数据节点
一：实验环境
已搭建好mysql cluster（一个管理节点，2个sql节点及2个数据节点）,搭建步骤请参考：http://blog.csdn.net/yabingshi_tech/article/details/47952135，现要在此基础上添加
192.168.6.70,192.168.6.71作为数据节点。(由于副本集参数已经配置成了2，所以必须一次添加2个数据节点）
二：实验步骤
2.1：解压cluster安装包
tar -xvf mysql-cluster-gpl-7.2.15-linux2.6-x86_64.tar.gz
mv mysql-cluster-gpl-7.2.15-linux2.6-x86_64 /usr/local/mysql
2.2：修改管理节点配置文件
cd /data/mysql/mysql-cluster
修改全局配置文件vi mgmd.cnf，修改后的配置文件如下：
[ndbd default] NoOfReplicas=2 DataMemory=80M IndexMemory=18M [ndb_mgmd] hostname=192.168.6.66 datadir=/data/mysql/mysql-cluster [ndbd] hostname=192.168.6.68 datadir=/usr/local/mysql/data [ndbd] hostname=192.168.6.69 datadir=/usr/local/mysql/data [ndbd] hostname=192.168.6.70 datadir=/usr/local/mysql/data [ndbd] hostname=192.168.6.71 datadir=/usr/local/mysql/data [mysqld] hostname=192.168.6.66 [mysqld] hostname=192.168.6.67
2.3：重新启动管理节点服务
2.3.1 停止管理节点
ndb_mgm> 1 stop
Node 1 has shutdown.
Disconnecting to allow Management Server to shutdown
--停止管理节点不影响sql节点的正常访问。
2.3.2 重新加载配置文件
[root@ser6-66 mysql-cluster]# ndb_mgmd -f mgmd.cnf --initial
MySQL Cluster Management Server mysql-5.5.35 ndb-7.2.15
/*
用initial或者reload参数重新加载
如果只在配置文件中新增一个数据节点，会报错：
[root@ser6-66 mysql-cluster]# ndb_mgmd -f mgmd.cnf --initial
MySQL Cluster Management Server mysql-5.5.35 ndb-7.2.15
2015-08-18 16:18:37 [MgmtSrvr] ERROR -- at line 38: Nodegroup 1 has 1 members, NoOfReplicas=2
2015-08-18 16:18:37 [MgmtSrvr] ERROR -- Could not load configuration from 'mgmd.cnf'
*/
2.3.4 查看集群状态
[root@ser6-66 mysql-cluster]# ndb_mgm 192.168.6.66 -- NDB Cluster -- Management Client -- ndb_mgm> show Connected to Management Server at: 192.168.6.66:1186 Cluster Configuration --------------------- [ndbd(NDB)]4 node(s) [email protected] (mysql-5.5.35 ndb-7.2.15, Nodegroup: 0) [email protected] (mysql-5.5.35 ndb-7.2.15, Nodegroup: 0, *) id=4 (not connected, accepting connect from 192.168.6.70) id=5 (not connected, accepting connect from 192.168.6.71) [ndb_mgmd(MGM)]1 node(s) [email protected] (mysql-5.5.35 ndb-7.2.15) [mysqld(API)]2 node(s) id=6 (not connected, accepting connect from 192.168.6.66) id=7 (not connected, accepting connect from 192.168.6.67)
发现我的两个sql节点not connect了，网上别人的都没断啊。以保万一，这个还是晚上访问量比较少的时候添数据节点加比较好。
2.4：修改配置文件/etc/my.cnf
在192.168.6.70,192.168.6.71上
编辑/etc/my.cnf
内容如下：
[mysqld] ndbcluster #运行NDB存储引擎 ndb-connectstring=192.168.6.66 #定位管理节点 [mysql_cluster] ndb-connectstring=192.168.6.66 #定位管理节点
2.5：轮流重新启动已连接的数据节点
ndb_mgm> 2 stop Node 2: Node shutdown initiated Node 2: Node shutdown completed. Node 2 has shutdown. [root@ser6-68 ~]# /usr/local/mysql/bin/ndbd --ndb-connectstring=192.168.6.66 2015-08-18 16:56:31 [ndbd] INFO -- Angel connected to '192.168.6.66:1186' 2015-08-18 16:56:31 [ndbd] INFO -- Angel allocated nodeid: 2 ndb_mgm> show Cluster Configuration --------------------- [ndbd(NDB)]4 node(s) [email protected] (mysql-5.5.35 ndb-7.2.15, Nodegroup: 0) [email protected] (mysql-5.5.35 ndb-7.2.15, Nodegroup: 0, *) id=4 (not connected, accepting connect from 192.168.6.70) id=5 (not connected, accepting connect from 192.168.6.71) [ndb_mgmd(MGM)]1 node(s) [email protected] (mysql-5.5.35 ndb-7.2.15) [mysqld(API)]3 node(s) [email protected] (mysql-5.5.35 ndb-7.2.15) id=7 (not connected, accepting connect from 192.168.6.67) id=8 (not connected, accepting connect from any host) --发现sql节点也起来了一个。 ndb_mgm> 3 stop Node 3: Node shutdown initiated Node 3: Node shutdown completed. Node 3 has shutdown. [root@ser6-69 download]# /usr/local/mysql/bin/ndbd --ndb-connectstring=192.168.6.66 2015-08-18 16:57:54 [ndbd] INFO -- Angel connected to '192.168.6.66:1186' 2015-08-18 16:57:54 [ndbd] INFO -- Angel allocated nodeid: 3 ndb_mgm> show Cluster Configuration --------------------- [ndbd(NDB)] 4 node(s) id=2 @192.168.6.68 (mysql-5.5.35 ndb-7.2.15, Nodegroup: 0, *) id=3 @192.168.6.69 (mysql-5.5.35 ndb-7.2.15, Nodegroup: 0) id=4 (not connected, accepting connect from 192.168.6.70) id=5 (not connected, accepting connect from 192.168.6.71) [ndb_mgmd(MGM)] 1 node(s) id=1 @192.168.6.66 (mysql-5.5.35 ndb-7.2.15) [mysqld(API)] 3 node(s) id=6 @192.168.6.66 (mysql-5.5.35 ndb-7.2.15) id=7 @192.168.6.67 (mysql-5.5.35 ndb-7.2.15) id=8 (not connected, accepting connect from any host) 此时发现id=7的sql节点也自动连接上了。
2.6：轮流重新启动连接的sql节点
service mysql restart ndb_mgm> show Cluster Configuration --------------------- [ndbd(NDB)]4 node(s) [email protected] (mysql-5.5.35 ndb-7.2.15, Nodegroup: 0, *) [email protected] (mysql-5.5.35 ndb-7.2.15, Nodegroup: 0) id=4 (not connected, accepting connect from 192.168.6.70) id=5 (not connected, accepting connect from 192.168.6.71) [ndb_mgmd(MGM)]1 node(s) [email protected] (mysql-5.5.35 ndb-7.2.15) [mysqld(API)]3 node(s) id=6 (not connected, accepting connect from 192.168.6.66) [email protected] (mysql-5.5.35 ndb-7.2.15) [email protected] (mysql-5.5.35 ndb-7.2.15)
2.7：初始化新的数据节点
在192.168.6.70,192.168.6.71上分别： /usr/local/mysql/bin/ndbd --initial --ndb-connectstring=192.168.6.66 ndb_mgm> show Cluster Configuration --------------------- [ndbd(NDB)]4 node(s) [email protected] (mysql-5.5.35 ndb-7.2.15, Nodegroup: 0, *) [email protected] (mysql-5.5.35 ndb-7.2.15, Nodegroup: 0) [email protected] (mysql-5.5.35 ndb-7.2.15, no nodegroup) [email protected] (mysql-5.5.35 ndb-7.2.15, no nodegroup) [ndb_mgmd(MGM)]1 node(s) [email protected] (mysql-5.5.35 ndb-7.2.15) [mysqld(API)]3 node(s) id=6 (not connected, accepting connect from 192.168.6.66) [email protected] (mysql-5.5.35 ndb-7.2.15) [email protected] (mysql-5.5.35 ndb-7.2.15) /* mycluster 中没有参数设置节点组数. 节点组数=节点数/NoOfReplicas. 所以你如果总共有两个数据节点,如果NoOfReplicas设为2, 那么意味着只有一个节点组. 如果NoOfReplicas=1,那么就有两个节点组。 */ ndb_mgm> CREATE NODEGROUP 4,5 Nodegroup 1 created 这个数字不是随意设置的，是指你要添加哪些node到nodegroup中，这里是id=4,id=5的数据节点。 ndb_mgm> show Cluster Configuration --------------------- [ndbd(NDB)]4 node(s) [email protected] (mysql-5.5.35 ndb-7.2.15, Nodegroup: 0, *) [email protected] (mysql-5.5.35 ndb-7.2.15, Nodegroup: 0) [email protected] (mysql-5.5.35 ndb-7.2.15, Nodegroup: 1) [email protected] (mysql-5.5.35 ndb-7.2.15, Nodegroup: 1) [ndb_mgmd(MGM)]1 node(s) [email protected] (mysql-5.5.35 ndb-7.2.15) [mysqld(API)]3 node(s) id=6 (not connected, accepting connect from 192.168.6.66) [email protected] (mysql-5.5.35 ndb-7.2.15) [email protected] (mysql-5.5.35 ndb-7.2.15) mysql> ALTER ONLINE TABLE t2 REORGANIZE PARTITION; Query OK, 0 rows affected (7.99 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> select partition_name,table_rows from information_schema.PARTITIONS where table_name='t2' and table_schema='dba'; +----------------+------------+ | partition_name | table_rows | +----------------+------------+ | p0 | 3 | | p1 | 0 | | p2 | 1 | | p3 | 2 | +----------------+------------+ 4 rows in set (0.02 sec)
原先t2分布在p0,p1,现在也能分布在p2,p3啦。成功啦！嘎嘎！
注意:如果配置过程中出现问题，记得将防火墙给关闭。
/*
以下是我在配置过程中遇到的问题：
ndb_mgm> create nodegroup 6,7
* 110: Error
* Time out talking to management server
mysql> ALTER ONLINE TABLE t2 REORGANIZE PARTITION;
ERROR 1297 (HY000): Got temporary error 711 'System busy with node restart, schema operations not allowed' from NDBCLUSTER
出错原因:192.168.6.70,192.168.6.71的防火墙处于开启状态
解决办法：关闭防火墙
*/
本篇文章参考：
http://blog.csdn.net/chengfei112233/article/details/7706275