MySQL Cluster

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MySQL CLuster
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MySQL CLuster

The cluster need a lot of server for experiments, if you haven't any server for one, I have a good idea that using Vmware for you.

at first, let's create lots of virtual machine(You MUST have a third server). and then follow me step by step learning how to set up a mysql cluster on your virtual machine.

mgm 192.168.0.1 # Management
data 192.168.0.2 # Ndbd Node
data 192.168.0.3 # Ndbd Node
sql 192.168.0.4 # SQL Node
sql 192.168.0.5 # SQL Node

Management node (MGM node)

neo@mgm:~$ sudo vim /var/lib/mysql-cluster/config.ini

[NDBD DEFAULT]
NoOfReplicas=2
DataMemory=80M
IndexMemory=18M

[MYSQLD DEFAULT]

[NDB_MGMD DEFAULT]

[TCP DEFAULT]
portnumber=2202

[NDB_MGMD]
hostname=192.168.0.1
datadir=/var/lib/mysql-cluster

[NDBD]
hostname=192.168.0.2
datadir=/var/lib/mysql-cluster

[NDBD]
hostname=192.168.0.3
datadir=/var/lib/mysql-cluster

[MYSQLD]
hostname=192.168.0.4

[MYSQLD]
hostname=192.168.0.5

Data node

my.cnf

neo@data:~$ sudo vim /etc/mysql/my.cnf

[mysqld]
ndbcluster
ndb-connectstring=192.168.0.1 # the IP of the MANAGMENT SERVER
[mysql_cluster]
ndb-connectstring=192.168.0.1 # the IP of the MANAGMENT SERVER

SQL node

my.cnf

neo@sql:~$ sudo vim /etc/mysql/my.cnf

[mysqld]
ndbcluster
ndb-connectstring=192.168.0.1 # the IP of the MANAGMENT SERVER
[mysql_cluster]
ndb-connectstring=192.168.0.1 # the IP of the MANAGMENT SERVER

Starting

1.

starting mgm

neo@mgm:~$ sudo ndb_mgmd -f /var/lib/mysql-cluster/config.ini

2.

initial ndbd

neo@data:~$ sudo ndbd --initial

首次运行需要 --initial 参数，以后不需要。

Shutdown

MGM

$ sudo ndb_mgm -e shutdown

Testing

neo@mgm:~$ ndb_mgm
-- NDB Cluster -- Management Client --
ndb_mgm> show
Connected to Management Server at: localhost:1186
Cluster Configuration
---------------------
[ndbd(NDB)] 2 node(s)
id=2 @192.168.0.2 (Version: 5.0.51, Nodegroup: 0)
id=3 @192.168.0.3 (Version: 5.0.51, Nodegroup: 0, Master)

[ndb_mgmd(MGM)] 1 node(s)
id=1 @192.168.0.1 (Version: 5.0.51)

[mysqld(API)] 2 node(s)
id=4 @192.168.0.4 (Version: 5.0.51)
id=5 @192.168.0.5 (Version: 5.0.51)

ndb_mgm>

与没有使用簇的MySQL相比，在MySQL簇内操作数据的方式没有太大的区别。

执行这类操作时应记住三点

1.

表必须用ENGINE=NDB或ENGINE=NDBCLUSTER选项创建，或用ALTER TABLE选项更改，以使用NDB Cluster存储引擎在 Cluster内复制它们。如果使用mysqldump的输出从已有数据库导入表，可在文本编辑器中打开SQL脚本，并将该选项添加到任何表创建语句，或用这类选项之一替换任何已有的ENGINE（或TYPE）选项。
2.

另外还请记住，每个NDB表必须有一个主键。如果在创建表时用户未定义主键，NDB Cluster存储引擎将自动生成隐含的主键。（注释：该隐含键也将占用空间，就像任何其他的表索引一样。由于没有足够的内存来容纳这些自动创建的键，出现问题并不罕见）。
3.

当你在一个节点上运行create database mydb;你去其他sql node上执行show databases;将不能看到mydb,你需要创建它，然后use mydb; show tables;你将看到同步的表。

SQL Node 1

neo@sql:~$ mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 7
Server version: 5.0.51a-3ubuntu5.1 (Ubuntu)

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql> create database cluster;
Query OK, 1 row affected (0.00 sec)

mysql> use cluster
Database changed
mysql> create table city( id mediumint unsigned not null auto_increment primary key, name varchar(20) not null default '' ) engine = ndbcluster default charset utf8;
Query OK, 0 rows affected (1.07 sec)

mysql> insert into city values(1, 'Shenzhen');
Query OK, 1 row affected (0.12 sec)

mysql> insert into city values(2, 'Guangdong');
Query OK, 1 row affected (0.00 sec)

SQL Node 2

neo@sql:~$ mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 7
Server version: 5.0.51a-3ubuntu5.1 (Ubuntu)

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| example |
| mydb |
| mysql |
| neo |
+--------------------+
6 rows in set (0.13 sec)

mysql> create database cluster;
Query OK, 1 row affected (0.00 sec)

mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| cluster |
| example |
| mydb |
| mysql |
| neo |
+--------------------+
6 rows in set (0.13 sec)

mysql> use cluster;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> show tables;
+-------------------+
| Tables_in_cluster |
+-------------------+
| city |
+-------------------+
1 row in set (0.01 sec)

mysql> select * from city;
+----+-----------+
| id | name |
+----+-----------+
| 1 | Shenzhen |
| 2 | Guangdong |
+----+-----------+
2 rows in set (0.03 sec)

mysql>