MySQL cluster是share nothing的集群，采用ndb存储引擎，和Oracle的RAC采用集中存储不同，是一种分布式的架构，所以可以很轻松的实现在同一台主机上配置MySQL Cluster，相对RAC来说要简单得多。
在MySQL Cluster中，有三种不同的节点：
- 管理节点：守护进程为ndb_mgmd，用于管理cluster。
- 数据节点: 守护进程为ndbd，用于存放数据
- SQL节点：守护进程为mysqld，就是一个MySQL实例，对外供客户端连接访问数据。
本文将在一台64位linux主机上同时配置上述三种节点。在实际生产环境中，根据需要，可以在相同或者不同的机器部署节点。本次实例中共包含以下节点：
下载Mysql cluster，当前版本7.0.6，http://dev.mysql.com/downloads/cluster/7.0.html
解压，并复制到安装目录
tar zxvf mysql-cluster-gpl-7.0.6-linux-x86_64-glibc23.tar.gz
cp mysql-cluster-gpl-7.0.6-linux-x86_64-glibc23 /u01/mysql-cluster
cd /u01/mysql-cluster
创建三个MySQL实例的数据目录
mkdir data/data1
mkdir data/data2
mkdir data/data3
mkdir data/data1/mysql
mkdir data/data1/test
mkdir data/data2/mysql
mkdir data/data2/test
mkdir data/data3/mysql
mkdir data/data3/test
Cluster配置文件如下
$ more conf/config.ini
[ndbd default]
noofreplicas=2
[ndbd]
hostname=localhost
id=2
[ndbd]
hostname=localhost
id=3
[ndb_mgmd]
id = 1
hostname=localhost
[mysqld]
id=4
hostname=localhost
[mysqld]
id=5
hostname=localhost
[mysqld]
id=6
hostname=localhost
三个MySQL实例配置文件如下
$ more conf/my1.cnf
[mysqld]
ndb-nodeid=4
ndbcluster=true
datadir=/u01/mysql-cluster/data/data1
basedir=/u01/mysql-cluster
port=9306
server-id=1
log-bin
$ more conf/my2.cnf
[mysqld]
ndb-nodeid=5
ndbcluster=true
datadir=/u01/mysql-cluster/data/data2
basedir=/u01/mysql-cluster
port=9307
server-id=2
log-bin
$ more conf/my3.cnf
[mysqld]
ndb-nodeid=6
ndbcluster=true
datadir=/u01/mysql-cluster/data/data3
basedir=/u01/mysql-cluster
port=9308
server-id=3
log-bin
初始化三个MySQL实例
script/mysql_install_db --basedir=/u01/mysql-cluster --datadir=/u01/mysql-cluster/data/data1
script/mysql_install_db --basedir=/u01/mysql-cluster --datadir=/u01/mysql-cluster/data/data2
script/mysql_install_db --basedir=/u01/mysql-cluster --datadir=/u01/mysql-cluster/data/data3
初始化管理节点
bin/ndb_mgmd --initial -f conf/config.ini --configdir=/u01/mysql-cluster
进入管理节点查看配置
$ bin/ndb_mgm
-- NDB Cluster -- Management Client --
ndb_mgm> help
---------------------------------------------------------------------------
NDB Cluster -- Management Client -- Help
---------------------------------------------------------------------------
HELP Print help text
HELP COMMAND Print detailed help for COMMAND(e.g. SHOW)
SHOW Print information about cluster
CREATE NODEGROUP ,... Add a Nodegroup containing nodes
DROP NODEGROUP Drop nodegroup with id NG
START BACKUP [NOWAIT | WAIT STARTED | WAIT COMPLETED]
START BACKUP [] [NOWAIT | WAIT STARTED | WAIT COMPLETED]
START BACKUP [] [SNAPSHOTSTART | SNAPSHOTEND] [NOWAIT | WAIT STARTED | WAIT COMPLETED]
Start backup (default WAIT COMPLETED,SNAPSHOTEND)
ABORT BACKUP Abort backup
SHUTDOWN Shutdown all processes in cluster
CLUSTERLOG ON [] ... Enable Clus
= ALERT | CRITICAL | ERROR | WARNING | INFO | DEBUG
= STARTUP | SHUTDOWN | STATISTICS | CHECKPOINT | NODERESTART | CONNECTION
| INFO | ERROR | CONGESTION | DEBUG | BACKUP
= 0 - 15
= ALL | Any database node id
For detailed help on COMMAND, use HELP COMMAND.
ndb_mgm> show
Connected to Management Server at: localhost:1186
Cluster Configuration
---------------------
[ndbd(NDB)] 2 node(s)
id=2 (not connected, accepting connect from localhost)
id=3 (not connected, accepting connect from localhost)
[ndb_mgmd(MGM)] 1 node(s)
id=1 @localhost (mysql-5.1.34 ndb-7.0.6)
[mysqld(API)] 3 node(s)
id=4 (not connected, accepting connect from localhost)
id=5 (not connected, accepting connect from localhost)
id=6 (not connected, accepting connect from localhost)
初始化数据节点
bin/ndbd --initial -c localhost:1186
2009-06-21 23:13:19 [ndbd] INFO -- Configuration fetched from 'localhost:1186', generation: 1
bin/ndbd --initial -c localhost:1186
2009-06-21 23:13:50 [ndbd] INFO -- Configuration fetched from 'localhost:1186', generation: 1
启动SQL节点
bin/mysqld --defaults-file=conf/my1.cnf&
[1] 17843
090621 23:14:36 [Warning] No argument was provided to --log-bin,
and --log-bin-index was not used; so replication may break when this MySQL server acts as a master
and has his hostname changed!! Please use '--log-bin=test-bin' to avoid this problem.
InnoDB: The first specified data file ./ibdata1 did not exist:
InnoDB: a new database to be created!
090621 23:14:36 InnoDB: Setting file ./ibdata1 size to 10 MB
InnoDB: Database physically writes the file full: wait...
090621 23:14:36 InnoDB: Log file ./ib_logfile0 did not exist: new to be created
InnoDB: Setting log file ./ib_logfile0 size to 5 MB
InnoDB: Database physically writes the file full: wait...
090621 23:14:36 InnoDB: Log file ./ib_logfile1 did not exist: new to be created
InnoDB: Setting log file ./ib_logfile1 size to 5 MB
InnoDB: Database physically writes the file full: wait...
InnoDB: Doublewrite buffer not found: creating new
InnoDB: Doublewrite buffer created
InnoDB: Creating foreign key constraint system tables
InnoDB: Foreign key constraint system tables created
090621 23:14:36 InnoDB: Started; log sequence number 0 0
090621 23:14:36 [Note] NDB: NodeID is 4, management server 'localhost:1186'
090621 23:14:37 [Note] NDB[0]: NodeID: 4, all storage nodes connected
090621 23:14:37 [Note] Starting Cluster Binlog Thread
090621 23:14:37 [Note] Event Scheduler: Loaded 0 events
090621 23:14:37 [Note] bin/mysqld: ready for connections.
Version: '5.1.34-ndb-7.0.6-cluster-gpl-log' socket: '/tmp/mysql.sock'
port: 9306 MySQL Cluster Server (GPL)
090621 23:14:38 [Note] NDB Binlog: Ndb tables initially read only.
090621 23:14:38 [Note] NDB: Creating mysql.ndb_schema
090621 23:14:38 [Note] NDB Binlog: CREATE TABLE Event: REPL$mysql/ndb_schema
090621 23:14:38 [Note] NDB Binlog: logging ./mysql/ndb_schema (UPDATED,USE_WRITE)
090621 23:14:38 [Note] NDB: Creating mysql.ndb_apply_status
090621 23:14:39 [Note] NDB Binlog: CREATE TABLE Event: REPL$mysql/ndb_apply_status
090621 23:14:39 [Note] NDB Binlog: logging ./mysql/ndb_apply_status (UPDATED,USE_WRITE)
2009-06-21 23:14:39 [NdbApi] INFO -- Flushing incomplete GCI:s < 20/3
2009-06-21 23:14:39 [NdbApi] INFO -- Flushing incomplete GCI:s < 20/3
090621 23:14:39 [Note] NDB Binlog: starting log at epoch 20/3
090621 23:14:39 [Note] NDB Binlog: ndb tables writable
bin/mysqld --defaults-file=conf/my2.cnf&
bin/mysqld --defaults-file=conf/my3.cnf&
查看cluster
bin/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 @127.0.0.1 (mysql-5.1.34 ndb-7.0.6, Nodegroup: 0, Master)
id=3 @127.0.0.1 (mysql-5.1.34 ndb-7.0.6, Nodegroup: 0)
[ndb_mgmd(MGM)] 1 node(s)
id=1 @127.0.0.1 (mysql-5.1.34 ndb-7.0.6)
[mysqld(API)] 3 node(s)
id=4 @127.0.0.1 (mysql-5.1.34 ndb-7.0.6)
id=5 @127.0.0.1 (mysql-5.1.34 ndb-7.0.6)
id=6 @127.0.0.1 (mysql-5.1.34 ndb-7.0.6)
创建测试表
bin/mysql -uroot -h localhost -P 9306 --socket=/tmp/mysql.sock
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.1.34-ndb-7.0.6-cluster-gpl-log MySQL Cluster Server (GPL)
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
root@(none) 11:21:24>use test
Database changed
root@test 11:21:26>create table test_ndb(i int,a varchar(20),primary key(i)) engine=ndb;
090621 23:22:32 [Note] NDB Binlog: CREATE TABLE Event: REPL$test/test_ndb
090621 23:22:32 [Note] NDB Binlog: logging ./test/test_ndb (UPDATED,USE_WRITE)
090621 23:22:32 [Note] NDB Binlog: DISCOVER TABLE Event: REPL$test/test_ndb
090621 23:22:32 [Note] NDB Binlog: DISCOVER TABLE Event: REPL$test/test_ndb
090621 23:22:32 [Note] NDB Binlog: logging ./test/test_ndb (UPDATED,USE_WRITE)
090621 23:22:32 [Note] NDB Binlog: logging ./test/test_ndb (UPDATED,USE_WRITE)
Query OK, 0 rows affected (1.10 sec)
root@test 11:22:32>insert into test_ndb values(1,'NinGoo');
Query OK, 1 row affected (0.02 sec)
[mysql@dbconsole mysql-cluster]$ ls -l data/data1/test
total 12
-rw-rw---- 1 mysql dba 8578 Jun 21 23:22 test_ndb.frm
-rw-rw---- 1 mysql dba 0 Jun 21 23:22 test_ndb.ndb
[mysql@dbconsole mysql-cluster]$ ls -l data/data2/test
total 12
-rw-rw---- 1 mysql dba 8578 Jun 21 23:22 test_ndb.frm
-rw-rw---- 1 mysql dba 0 Jun 21 23:22 test_ndb.ndb
[mysql@dbconsole mysql-cluster]$ ls -l data/data3/test
total 12
-rw-rw---- 1 mysql dba 8578 Jun 21 23:22 test_ndb.frm
-rw-rw---- 1 mysql dba 0 Jun 21 23:22 test_ndb.ndb
$ bin/mysql -uroot -P 9307 --socket=/tmp/mysql.sock
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.1.34-ndb-7.0.6-cluster-gpl-log MySQL Cluster Server (GPL)
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
root@(none) 11:24:38>use test
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
root@test 11:24:41>select * from test_ndb;
+---+--------+
| i | a |
+---+--------+
| 1 | NinGoo |
+---+--------+
1 row in set (0.02 sec)