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：
- 一个管理节点
- 两个数据节点
- 三个SQL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 writablebin/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)
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