MySQL Cluster 7.2 集群的部署

MySQL Cluster 7.2发布之后，大家都说好，性能如何提高。今天 wait4friend 就搭建一个小集群感受一下。

环境

Mangement Node (mgmd)	192.168.229.140
SQL Node A (mysqld)	192.168.229.141
SQL Node B (mysqld)	192.168.229.142
Data Node A (ndbd)	192.168.229.143
Data Node B (ndbd)	192.168.229.144

安装MySQL

在真实环境中，并不需要在MGMD和NDBD上面完整安装MySQL，不过考虑到方便些，直接在每个节点都进行了完整的安装。具体的安装过程和普通MySQL没有什么区别，只是暂时不需要配置/etc/my.cnf ， 后面专门进行配置。

MGMD节点的安装，仅需要把两个文件拷贝到下面的地址

# cp /usr/local/mysql/bin/ndb_mgm* /usr/local/bin
# chmod +x /usr/local/bin/ndb_mgm*

配置MySQL Cluster

NDBD配置

# vi /etc/my.cnf

[mysql_cluster]
# Options for ndbd process:
ndb-connectstring=192.168.229.140          # location of management server

MYSQLD配置，在现有的my.cnf上增加下面的参数，测试环境也编辑一个新的my.cnf

# vi /etc/my.cnf

[mysqld]
# Options for mysqld process:
ndbcluster                                           # run NDB storage engine
ndb-connectstring=192.168.229.140        # location of management server

MGMD配置

# mkdir /var/lib/mysql-cluster
# vi /var/lib/mysql-cluster/config.ini

[ndbd default]
# Options affecting ndbd processes on all data nodes:
NoOfReplicas=2               # Number of replicas
DataMemory=80M            # How much memory to allocate for data storage
IndexMemory=18M           # How much memory to allocate for index storage

[ndb_mgmd]
# Management process options:
hostname=192.168.229.140         # Hostname or IP address of MGM node
datadir=/var/lib/mysql-cluster      # Directory for MGM node log files

[ndbd]
# Options for data node "A":
hostname=192.168.229.143        
datadir=/usr/local/mysql/data    

[ndbd]
# Options for data node "B":
hostname=192.168.229.144        
datadir=/usr/local/mysql/data      

[mysqld]
# SQL node options:
hostname=192.168.229.141

[mysqld]
# SQL node options:
hostname=192.168.229.142

启动MySQL Cluster

启动集群是需要按照特定的顺序， 先MGMD，然后NDBD，最后MySQLD

1. MGMD 节点 首次启动过程中需要 -f 参数指定配置文件

# ndb_mgmd -f /var/lib/mysql-cluster/config.ini

如果修改了配置文件之后，需要 --reload 参数

# ndb_mgmd -f /var/lib/mysql-cluster/config.ini –reload

如果要用非root用户启动，需要修改几个目录的权限

# chown -R mysql /var/lib/mysql-cluster/
# chgrp -R mysql /var/lib/mysql-cluster/
# chown -R mysql /usr/local/mysql/mysql-cluster/
# chgrp -R mysql /usr/local/mysql/mysql-cluster/

2. NDBD 节点

第一次或者数据文件发生变化的时候使用 --initial 参数

$ ndbd –initial

正常情况下不需要任何参数启动

$ ndbd

3. MYSQLD 节点 的启动和单节点实例启动完全相同

$ /etc/init.d/mysql.server start

关闭MySQL Cluster

1. MGMD 节点

$ ndb_mgm –e shutdown

2. MYSQLD 节点

$ /etc/init.d/mysql.server stop

查看集群状态

$ 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    @192.168.229.143  (mysql-5.5.19 ndb-7.2.4, Nodegroup: 0, Master)
id=3    @192.168.229.144  (mysql-5.5.19 ndb-7.2.4, Nodegroup: 0)

[ndb_mgmd(MGM)]    1 node(s)
id=1    @192.168.229.140  (mysql-5.5.19 ndb-7.2.4)

[mysqld(API)]    2 node(s)
id=4    @192.168.229.141  (mysql-5.5.19 ndb-7.2.4)
id=5 (not connected, accepting connect from 192.168.229.142)