Mycat读写分离+高可用笔记

Mycat基础配置

用户创建及数据库导入

mysql -S /data/3307/mysql.sock 
grant all on *.* to root@'10.0.0.%' identified by '123';
source /root/world.sql

mysql -S /data/3308/mysql.sock 
grant all on *.* to root@'10.0.0.%' identified by '123';
source /root/world.sql

mycat实现1主1从读写分离

cd /app/mycat/conf/
mv schema.xml schema.xml.bak
vim schema.xml 
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">
<schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100" dataNode="sh1"> 
</schema>  
        <dataNode name="sh1" dataHost="worldtest" database= "world" />       
        <dataHost name="worldtest" maxCon="1000" minCon="10" balance="1"  writeType="0" dbType="mysql"  dbDriver="native" switchType="1">  
                <heartbeat>select user()</heartbeat>  
        <writeHost host="db1" url="10.0.0.12:3307" user="root" password="123">
                        <readHost host="db2" url="10.0.0.12:3309" user="root" password="123" /> 
        </writeHost> 
        </dataHost>  
</mycat:schema>

测试是否可用

mysql> begin;select @@server_id;commit;
Query OK, 0 rows affected (0.00 sec)

+-------------+
| @@server_id |
+-------------+
|           7 |
+-------------+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

mysql> select @@server_id;
+-------------+
| @@server_id |
+-------------+
|           9 |
+-------------+
1 row in set (0.01 sec)

Mycat高可用+读写分离

mv schema.xml schema.xml.1
vim schema.xml 
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">
<schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100" dataNode="sh1">
</schema>
        <dataNode name="sh1" dataHost="worldtest" database= "world" />
        <dataHost name="worldtest" maxCon="1000" minCon="10" balance="1"  writeType="0" dbType="mysql"  dbDriver="native" switchType="1">
                <heartbeat>select user()</heartbeat>
        <writeHost host="db1" url="10.0.0.12:3307" user="root" password="123">
                        <readHost host="db2" url="10.0.0.12:3309" user="root" password="123" />
        </writeHost>
        <writeHost host="db3" url="10.0.0.13:3307" user="root" password="123">
                        <readHost host="db4" url="10.0.0.13:3309" user="root" password="123" />
        </writeHost>
        </dataHost>
</mycat:schema>

第一个 whost: 10.0.0.12:3307 真正的写节点,负责写操作
第二个 whost: 10.0.0.13:3307 准备写节点,负责读,当 10.0.0.12:3307宕掉,会切换为真正的写节点
测试:

[root@db01 conf]# mysql -uroot -p123456 -h 10.0.0.10 -P 8066
读:
mysql> select @@server_id;
写:
mysql> begin ;select @@server_id; commit;