DBA10 - 分库分表概述配置mycat

----------------重要配置文件说明-------------------------
ls /usr/local/mycat/conf
server.xml 设置连接mycat服务的账号参数等
schema.xml 配置mycat使用的真实数据库和表
rule.xml 定义mycat分片规则

配置文件标签说明：
<user>.......</user> 定义连接mycat服务时使用的用户和密码及逻辑库的名字
<datanode>......</datanode> 指定数据节点（物理库的主机名和存储分片数据的数据库名）
<datahost>......</datahost> 指定数据库服务器的IP地址及连接数据库时使用的授权用户名及密码

名词解释：
逻辑库：客户端连接mycat服务器后看到的库名
逻辑表：客户端连接mycat服务器后看到表明，表明要与程序员存储数据用的表名相同。

编辑配置文件：

cd /usr/local/mycat/conf/server.xml

<user name="admin">
<property name="password">123456</property>
<property name="schemas">TESTDB</property>
</user>

<user name="webuser">
<property name="password">123456</property>
<property name="schemas">TESTDB</property>
<property name="readOnly">true</property>
</user>
cat /usr/local/mycat/conf/schema.xml

<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://org.opencloudb/">

   <schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100"> #逻辑库名要与server.xml定义的一样


<table name="travelrecord" dataNode="dn1,dn2" rule="auto-sharding-long" /> #定义分片的表


<table name="company" primaryKey="ID" type="global" dataNode="dn1,dn2" /> #定义分片的表


<table name="goods" primaryKey="ID" type="global" dataNode="dn1,dn2" /> #定义分片的表


<table name="hotnews" primaryKey="ID" dataNode="dn1,dn2" rule="mod-long" /> #定义分片的表


<table name="employee" primaryKey="ID" dataNode="dn1,dn2" rule="sharding-by-intfile" /> #定义分片的表


<table name="customer" primaryKey="ID" dataNode="dn1,dn2" rule="sharding-by-intfile" /> #定义分片的表

   </schema>

<dataNode name="dn1" dataHost="c1" database="db1" />
#定义分片使用的库，所在的物理主机 ,真正存储数据的db1库在物理主机c1上

<dataNode name="dn2" dataHost="c2" database="db2" />
#定义分片使用的库，所在的物理主机 ,真正存储数据的db2库在物理主机c2上

#指定c1名称主机对应的ip地址
   <dataHost name="c1" maxCon="1000" minCon="10" balance="0"
       writeType="0" dbType="mysql" dbDriver="native" >
       <heartbeat>select user()</heartbeat>
<writeHost host="hostM1" url="192.168.4.55:3306" user="admin"
           password="123456"> #访问数据时 mycat服务连接数据库服务器时使用的用户名和密码
       </writeHost>
   </dataHost>

#指定c2名称主机对应的ip地址
   <dataHost name="c2" maxCon="1000" minCon="10" balance="0"
       writeType="0" dbType="mysql" dbDriver="native" >
       <heartbeat>select user()</heartbeat>
<writeHost host="hostM2" url="192.168.4.54:3306" user="admin"
           password="123456"> #访问数据时 mycat服务连接数据库服务器时使用的用户名和密码
       </writeHost>
   </dataHost>
</mycat:schema>

++++++++++++++++++++启动服务
[root@localhost ~]# sed -n '4,5p' /usr/local/mycat/conf/wrapper.conf
# Java Application
wrapper.java.command=java
[root@localhost ~]#
[root@localhost ~]# which java
/usr/bin/java

[root@localhost ~]#echo "export PATH=/usr/local/mycat/bin" >> /etc/profile
[root@localhost ~]#source /etc/profile

[root@localhost ~]# mycat --help
Usage: /usr/local/mycat/bin/mycat { console | start | stop | restart | status | dump }
[root@localhost ~]#

[root@localhost ~]# mycat start
Starting Mycat-server...
[root@localhost ~]#
[root@localhost ~]# netstat -utnalp | grep :8066
tcp6 0 0 :::8066 :::* LISTEN 4524/java
[root@localhost ~]#

MySQL [TESTDB]> MySQL [TESTDB]> create table employee( id int not null primary key, name varchar(100), sharding_id int not null );

MySQL [TESTDB]> MySQL [TESTDB]> insert into employee(id,name,sharding_id)values(1,"bob",10000),(2,"lucy",10010),(3,"alice",10000),(4,"jerry",10010);

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++
mysql> select @@hostname;
+------------+
| @@hostname |
+------------+
| c1 |
+------------+
1 row in set (0.00 sec)

mysql> select * from employee;
Empty set (0.00 sec)

mysql> select * from employee;
+----+-------+-------------+
| id | name | sharding_id |
+----+-------+-------------+
| 1 | bob | 10000 |
| 3 | alice | 10000 |
+----+-------+-------------+
2 rows in set (0.00 sec)

mysql>
++++++++++++++++++++++++++++++++++++++++++++++
mysql> select @@hostname;
+------------+
| @@hostname |
+------------+
| c2 |
+------------+
1 row in set (0.00 sec)

mysql> select * from employee;
Empty set (0.00 sec)

mysql> select * from employee;
+----+-------+-------------+
| id | name | sharding_id |
+----+-------+-------------+
| 2 | lucy | 10010 |
| 4 | jerry | 10010 |
+----+-------+-------------+
2 rows in set (0.00 sec)

mysql>

DBA10 - 分库分表概述 配置mycat

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DBA10 - 分库分表概述配置mycat