mycat的使用

192.168.126.128 node01
192.168.126.129 node02
192.168.126.130 node03
192.168.126.131 node04


解压文件到/usr/local文件夹下
tar -zxvf  Mycat-server-1.6.7.5-release-20200422133810-linux.tar.gz -C /usr/local
配置环境变量
vi /etc/profile
添加如下配置信息：
export MYCAT_HOME=/usr/local/mycat
export PATH=$MYCAT_HOME/bin:$PATH:$JAVA_HOME/bin

// server.xml
<?xml version="1.0" encoding="UTF-8"?>
<!-- - - Licensed under the Apache License, Version 2.0 (the "License"); 
	- you may not use this file except in compliance with the License. - You 
	may obtain a copy of the License at - - http://www.apache.org/licenses/LICENSE-2.0 
	- - Unless required by applicable law or agreed to in writing, software - 
	distributed under the License is distributed on an "AS IS" BASIS, - WITHOUT 
	WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - See the 
	License for the specific language governing permissions and - limitations 
	under the License. -->
<!DOCTYPE mycat:server SYSTEM "server.dtd">
<mycat:server xmlns:mycat="http://io.mycat/">
	<user name="root" defaultAccount="true">
		<property name="password">123456</property>
		<property name="schemas">TESTDB</property>
		<property name="defaultSchema">TESTDB</property>
	</user>
</mycat:server>

// schema.xml
<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">
        <schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn1">
        </schema>
        <dataNode name="dn1" dataHost="host1" database="msb" />
        <dataHost name="host1" maxCon="1000" minCon="10" balance="0"
                          writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
                <heartbeat>select user()</heartbeat>
                <writeHost host="hostM1" url="192.168.85.111:3306" user="root"
                                   password="123456">
                        <readHost host="hostS1" url="192.168.85.112:3306" user="root" password="123456"></readHost>
                </writeHost>
        </dataHost>
</mycat:schema>

./mycat console

./mycat start

mysql -uroot -p123456 -P 9066 -h 192.168.85.111

mysql -uroot -p123456 -P8066 -h 192.168.85.111

 

// 主从复制 /etc/my.cnf
[mysqld]
bind-address=0.0.0.0
port=3306
user=mysql
basedir=/usr/local/mysql
datadir=/data/mysql
socket=/tmp/mysql.sock
log-error=/data/mysql/mysql.err
pid-file=/data/mysql/mysql.pid
#character config
character_set_server=utf8mb4
symbolic-links=0
explicit_defaults_for_timestamp=true

plugin-load-add=validate_password.so
#服务器在启动时加载插件，并防止在服务器运行时删除插件。
validate-password=FORCE_PLUS_PERMANENT

#mysql服务唯一id，不同的mysql服务必须拥有全局唯一的id
server-id=1
#启动二进制日期
log-bin=mysql-bin
#设置不要复制的数据库
binlog-ignore-db=mysql
binlog-ignore-db=information-schema
#设置需要复制的数据库
binlog-do-db=msb
#设置binlog的格式
binlog_format=statement

// 从
[mysqld]
bind-address=0.0.0.0
port=3306
user=mysql
basedir=/usr/local/mysql
datadir=/data/mysql
socket=/tmp/mysql.sock
log-error=/data/mysql/mysql.err
pid-file=/data/mysql/mysql.pid
#character config
character_set_server=utf8mb4
symbolic-links=0
explicit_defaults_for_timestamp=true
#服务器唯一id
server-id=2
#启动中继日志
relay-log=mysql-relay

grant replication slave on *.* to 'root'@'%' identified by '123456';
--在进行授权的时候，如果提示密码的问题，把密码验证取消
set global validate_password_policy=0;
set global validate_password_length=1;

show master status;

CHANGE MASTER TO MASTER_HOST='192.168.126.128',MASTER_USER='root',MASTER_PASSWORD='123456',MASTER_LOG_FILE='mysql-bin.000001',MASTER_LOG_POS=437;

start slave;

show slave status\G

--在node01上创建数据库
create database msb;
--在node01上创建具体的表
create table mytbl(id int,name varchar(20));
--在node01上插入数据
insert into mytbl values(1,'zhangsan');
--在node02上验证发现数据已经同步成功，表示主从复制完成



-- 把主机名插入数据库中
insert into mytbl values(3,@@hostname);
-- 然后通过mycat进行数据的访问，这个时候大家发现无论怎么查询数据，最终返回的都是node01的数据,为什么呢？
select * from mytbl;