本次实验用到四台机器，具体信息如下：
1）配置server.xml
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | <user name="root" defaultAccount="true"> <property name="password">mysql</property> <property name="schemas">TESTDB</property> <!-- 表级 DML 权限设置 --> <!-- <privileges check="false"> <schema name="TESTDB" dml="0110" > <table name="tb01" dml="0000"></table> <table name="tb02" dml="1111"></table> </schema> </privileges> --> </user> |
配置用户root，密码为mysql，对TESTDB具有权限
2）配置schema.xml
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | <schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn1"></schema> <!-- <dataNode name="dn1$0-743" dataHost="localhost1" database="db$0-743" /> --> <dataNode name="dn1" dataHost="localhost1" database="test" /> <dataNode name="dn2" dataHost="localhost1" database="dedecms" /> <dataNode name="dn3" dataHost="localhost1" database="xcredit" /> <!--<dataNode name="dn4" dataHost="sequoiadb1" database="SAMPLE" /> <dataNode name="jdbc_dn1" dataHost="jdbchost" database="db1" /> <dataNode name="jdbc_dn2" dataHost="jdbchost" database="db2" /> <dataNode name="jdbc_dn3" dataHost="jdbchost" database="db3" /> --> <dataHost name="localhost1" maxCon="1000" minCon="10" balance="1" writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100"> <heartbeat>select user()</heartbeat> <!-- can have multi write hosts --> <writeHost host="master1" url="192.168.8.57:3306" user="root" password="mysql"> <!-- can have multi read hosts --> <readHost host="slave" url="192.168.8.59:3306" user="root" password="mysql" /> </writeHost> <writeHost host="master2" url="192.168.8.58:3306" user="root" password="mysql" /> |
- 1
schema标签：schema name属性指定逻辑库名，dataNode属性指定下边的dataNode - 1
dataNode标签：dataHost指定下边的dataHost，database指定具体的database - 1
dataHost标签：balance指的负载均衡类型，switchType指的是切换的模式
balance指的负载均衡类型，目前的取值有4种：
1. balance="0", 不开启读写分离机制，所有读操作都发送到当前可用的writeHost上。
2. balance="1"，全部的readHost与stand by writeHost参与select语句的负载均衡。
3. balance="2"，所有读操作都随机的在writeHost、readhost上分发。
4. balance="3"，所有读请求随机的分发到wiriterHost对应的readhost执行，writerHost不负担读压力
switchType指的是切换的模式，目前的取值也有4种：
1. switchType='-1' 表示不自动切换
2. switchType='1' 默认值，表示自动切换
3. switchType='2' 基于MySQL主从同步的状态决定是否切换,心跳语句为 show slave status
4. switchType='3'基于MySQL galary cluster的切换机制（适合集群）（1.4.1），心跳语句为 show status like 'wsrep%'。
3）启动mycat，并观察日志
/usr/local/mycat/bin/mycat start
1 2 3 4 5 6 7 8 9 10 | [root@oneproxy logs]# tail -f wrapper.log STATUS | wrapper | 2018/08/25 10:32:39 | --> Wrapper Started as DaemonSTATUS | wrapper | 2018/08/25 10:32:40 | Launching a JVM...INFO | jvm 1 | 2018/08/25 10:32:40 | Wrapper (Version 3.2.3) INFO | jvm 1 | 2018/08/25 10:32:40 | Copyright 1999-2006 Tanuki Software, Inc. All Rights Reserved.INFO | jvm 1 | 2018/08/25 10:32:40 | INFO | jvm 1 | 2018/08/25 10:32:41 | log4j:WARN No appenders could be found for logger (io.mycat.memory.MyCatMemory).INFO | jvm 1 | 2018/08/25 10:32:41 | log4j:WARN Please initialize the log4j system properly.INFO | jvm 1 | 2018/08/25 10:32:41 | log4j:WARN See INFO | jvm 1 | 2018/08/25 10:32:41 | MyCAT Server startup successfully. see logs in logs/mycat.log |
4）在mycat服务器登录mysql
mysql -uroot -pmysql -P8066 -h192.168.8.63
mysql> show databases;
+----------+
| DATABASE |
+----------+
| TESTDB |
+----------+
5）测试读写分离
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 | mysql> use TESTDB;mysql> create table t4(hostname1 varchar(12),hostname2 varchar(12),hostname3 varchar(12));mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname);mysql> mysql> insert into t4 values(@@hostname,@@hostname,@@hostname); |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | mysql> select * from t4;+-----------+-----------+-----------+| hostname1 | hostname2 | hostname3 |+-----------+-----------+-----------+| master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 || master1 | master1 | master1 |+-----------+-----------+-----------+64 rows in set (0.00 sec) |
插入的数据都是从master1插入的，通过查询mycat日志，发现所有的查询全部分发到了slave节点。
