$ vim /etc/my.cnf 
log-bin = mysql-bin #[必須]啟用二進制日志 
server-id = 4 #[必須]服務(wù)器唯一ID，默認(rèn)是1，最好取ip的后3位 
expire-logs-days = 7 #只保留7天的二進制日志，以防磁盤被日志占滿 
binlog-ignore-db = mysql #不備份的數(shù)據(jù)庫 
binlog-ignore-db = information_schema 
binlog-ignore-db = performation_schema 
binlog-ignore-db = sys 
binlog-do-db=itools_simple #需要做復(fù)制的數(shù)據(jù)庫名，如果有多個，復(fù)制binlog-do-db即可 

$ mysql -u root -p 
 Root@123 
// log_bin ON表示開啟成功，OFF表示開啟失敗 
mysql> show variables like '%log_bin%'; 
+---------------------------------+--------------------------------+ 
| Variable_name | Value | 
+---------------------------------+--------------------------------+ 
| log_bin | ON | 
| log_bin_basename | /var/lib/mysql/mysql-bin | 
| log_bin_index | /var/lib/mysql/mysql-bin.index | 
| log_bin_trust_function_creators | OFF | 
| log_bin_use_v1_row_events | OFF | 
| sql_log_bin | ON | 
+---------------------------------+--------------------------------+ 
6 rows in set (0.01 sec) 

mysql> grant replication slave on *.* to 'backup'@'%' identified by 'Root@123'; 
mysql> use mysql 
mysql> select user,authentication_string,host from user; 

$ systemctl restart mysqld 

$ mysql -u root -p 
 Root@123 
mysql> flush tables with read lock; 
mysql> show master status \G 
*************************** 1. row *************************** 
 File: mysql-bin.000003 
 Position: 154 
 Binlog_Do_DB: itools_simple 
 Binlog_Ignore_DB: mysql,information_schema,performation_schema,sys 
Executed_Gtid_Set: 
 1 row in set (0.01 sec) 
// 導(dǎo)出數(shù)據(jù)庫，進入到一個合適的文件夾 
$ mysqldump -u root -p itools_simple > itools_simple.txt 
// 把生成的文件導(dǎo)出到本機 
$ sz itools_simple.txt 
// 在window本機打開cmd，登錄slave本機mysql數(shù)據(jù)庫，導(dǎo)入數(shù)據(jù)庫 
$ .\mysql -u root -p -hlocalhost mycat_master < .\itools_simple.txt 

[mysql] 
#default-character-set=utf8 
[mysqld] 
max_connections=200 
character-set-server=utf8 
default-storage-engine=INNODB 
# 添加一下配置 
log-bin=mysql-bin 
server-id=223 

net stop mysql 
net start mysql 

$ mysql -u root -p 
 123456 
// 停止 slave 
mysql> stop slave; 
// 根據(jù)master中的status，添加以下配置 
msyql> change master to master_host='192.168.0.105',master_user='backup',master_password='Root@123',master_log_file='mysql-bin.000003',master_log_pos=154; 
// 啟用slave 
mysql> start slave; 
// 查看slave狀態(tài) 
mysql> show slave status \G 
*************************** 1. row *************************** 
 Slave_IO_State: Waiting for master to send event 
 Master_Host: 192.168.0.105 
 Master_User: backup 
 Master_Port: 3306 
 Connect_Retry: 60 
 Master_Log_File: mysql-bin.000003 
 Read_Master_Log_Pos: 154 
 Relay_Log_File: DESKTOP-OB9O5N7-relay-bin.000002 
 Relay_Log_Pos: 320 
 Relay_Master_Log_File: mysql-bin.000003 
 Slave_IO_Running: Yes 
 Slave_SQL_Running: Yes 
 .............. 
1 row in set (0.00 sec) 
// 出現(xiàn)下面兩個說明配置正確 
 Slave_IO_Running: Yes 
Slave_SQL_Running: Yes 

mysql> unlock tables; 

mysql> show variables like '%storage_engine%'; 
+----------------------------------+--------+ 
| Variable_name | Value | 
+----------------------------------+--------+ 
| default_storage_engine | InnoDB | 
| default_tmp_storage_engine | InnoDB | 
| disabled_storage_engines | | 
| internal_tmp_disk_storage_engine | InnoDB | 
+----------------------------------+--------+ 
4 rows in set (0.00 sec) 
// 修改配置文件 
$ vim /etc/my.ini 
 [mysqld] 
 default-storage-engine=MyISAM 
$ systemctl restart mysqld 
mysql> show variables like '%storage_engine%'; 
+----------------------------------+--------+ 
| Variable_name | Value | 
+----------------------------------+--------+ 
| default_storage_engine | MyISAM | 
| default_tmp_storage_engine | InnoDB | 
| disabled_storage_engines | | 
| internal_tmp_disk_storage_engine | InnoDB | 
+----------------------------------+--------+ 
4 rows in set (0.00 sec) 

mysql> set global log_bin_trust_function_creators=TRUE; 

$ wget http://dl.mycat.io/1.6.7.5/2020-3-3/Mycat-server-1.6.7.5-test-20200303154735-linux.tar.gz 
$ tar -zxvf Mycat-server-1.6.7.5-test-20200303154735-linux.tar.gz 
$ cd mycat 
$ useradd mycat 
$ chown -R mycat:mycat /usr/local/mycat/mycat 
$ passwd mycat 
// 配置hostname，添加以下配置 
[root@localhost mycat] vim /etc/sysconfig/network 
 HOSTNAME=localhost（主機名） 
// 查看是否配置主機 
$ vim /etc/hosts 

$ vim /etc/profile 
// 在最后添加 
MYCAT_HOME=/usr/local/mycat/mycat 
PATH=$MYCAT_HOME/bin:$PATH 
export PATH 
// 使配置生效 
$ source /etc/profile 

<?xml version="1.0"?> 
<!DOCTYPE mycat:schema SYSTEM "schema.dtd"> 
<mycat:schema xmlns:mycat="http://io.mycat/"> 
 <schema name="itools_simple" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn1"> 
 </schema> 
 <dataNode name="dn1" dataHost="localhost" database="itools_simple" /> 
 <dataHost name="localhost" maxCon="1000" minCon="10" balance="0" 
 writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100"> 
 <heartbeat>select user()</heartbeat> 
 <writeHost host="hostM1" url="192.168.0.105:3306" user="user1" password="Root@123"> 
 <!-- 可以配置多個從庫 --> 
 <readHost host="hostS2" url="127.0.0.1:3306" user="user2" password="Root@123" /> 
 </writeHost> 
 </dataHost> 
</mycat:schema> 

<user name="user1" defaultAccount="true"> 
 <property name="password">Root@123</property> 
 <property name="schemas">itools_simple</property> 
 <property name="defaultSchema">itools_simple</property> 
</user> 
<user name="user2"> 
 <property name="password">Root@123</property> 
 <property name="schemas">itools_simple</property> 
 <property name="readOnly">true</property> 
 <property name="defaultSchema">itools_simple</property> 
</user> 

$ mycat start 
Starting Mycat-server... 

$ cat wrapper.log 
MyCAT Server startup successfully. see logs in logs/mycat.log

<dependency> 
 <groupId>org.springframework.boot</groupId> 
 <artifactId>spring-boot-starter-aop</artifactId> 
</dependency> 
<dependency> 
 <groupId>com.alibaba</groupId> 
 <artifactId>druid</artifactId> 
 <version>1.0.23</version> 
</dependency> 

package com.muycode.itoolsimple.datasource; 
import org.springframework.boot.context.properties.ConfigurationProperties; 
import org.springframework.boot.jdbc.DataSourceBuilder; 
import org.springframework.context.annotation.Bean; 
import org.springframework.context.annotation.Configuration; 
import javax.sql.DataSource; 
@Configuration 
public class DataSourceConfig { 
 /** 
 * 創(chuàng)建可讀數(shù)據(jù)源 
 * 
 * @return 
 */ 
 @Bean(name = "selectDataSource") 
 @ConfigurationProperties(prefix = "spring.datasource.select") 
 public DataSource dataSource1() { 
 return DataSourceBuilder.create().build(); 
 } 
 /** 
 * 創(chuàng)建可寫數(shù)據(jù)源 
 * 
 * @return 
 */ 
 @Bean(name = "updateDataSource") 
 @ConfigurationProperties(prefix = "spring.datasource.update") 
 public DataSource dataSource2() { 
 return DataSourceBuilder.create().build(); 
 } 
} 

package com.muycode.itoolsimple.datasource; 
import org.springframework.context.annotation.Lazy; 
import org.springframework.stereotype.Component; 
@Component 
@Lazy(false) 
public class DataSourceContextHolder { 
 /** 
 * 采用ThreadLocal 保存本地多數(shù)據(jù)源 
 */ 
 private static final ThreadLocal<String> contextHolder = new ThreadLocal<>(); 
 /** 
 * 設(shè)置數(shù)據(jù)源類型 
 * 
 * @param dbType 
 */ 
 public static void setDbType(String dbType) { 
 contextHolder.set(dbType); 
 } 
 /** 
 * 獲取數(shù)據(jù)源類型 
 */ 
 public static String getDbType() { 
 return contextHolder.get(); 
 } 
 public static void clearDbType() { 
 contextHolder.remove(); 
 } 
} 

package com.muycode.itoolsimple.datasource; 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.beans.factory.annotation.Qualifier; 
import org.springframework.context.annotation.Primary; 
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource; 
import org.springframework.stereotype.Component; 
import javax.sql.DataSource; 
import java.util.HashMap; 
import java.util.Map; 
@Component 
@Primary 
 public class DynamicDataSource extends AbstractRoutingDataSource { 
 @Autowired 
 @Qualifier("selectDataSource") 
 private DataSource selectDataSource; 
 @Autowired 
 @Qualifier("updateDataSource") 
 private DataSource updateDataSource; 
 /** 
 * 返回生效的數(shù)據(jù)源名稱 
 */ 
 @Override 
 protected Object determineCurrentLookupKey() { 
 return DataSourceContextHolder.getDbType(); 
 } 
 /** 
 * 配置數(shù)據(jù)源信息 
 */ 
 @Override 
 public void afterPropertiesSet() { 
 Map<Object, Object> map = new HashMap<>(16); 
 map.put("selectDataSource", selectDataSource); 
 map.put("updateDataSource", updateDataSource); 
 setTargetDataSources(map); 
 setDefaultTargetDataSource(updateDataSource); 
 super.afterPropertiesSet(); 
 } 
} 

package com.muycode.itoolsimple.datasource; 
import org.aspectj.lang.JoinPoint; 
import org.aspectj.lang.annotation.Aspect; 
import org.aspectj.lang.annotation.Before; 
import org.springframework.context.annotation.Lazy; 
import org.springframework.core.annotation.Order; 
import org.springframework.stereotype.Component; 
@Aspect 
@Component 
@Lazy(false) 
@Order(0) // Order設(shè)定AOP執(zhí)行順序 使之在數(shù)據(jù)庫事務(wù)上先執(zhí)行 
public class DataSourceOptionAop { 
 /** 
 * 可讀數(shù)據(jù)源 
 */ 
 private final static String DATASOURCE_TYPE_SELECT = "selectDataSource"; 
 /** 
 * 可寫數(shù)據(jù)源 
 */ 
 private final static String DATASOURCE_TYPE_UPDATE = "updateDataSource"; 
 /** 
 * 創(chuàng)建切面，根據(jù)方法類型選擇不同的數(shù)據(jù)源 
 * 
 * @param joinPoint 
 */ 
 @Before("execution(* com.muycode.itoolsimple.service.*.*(..))") 
 public void process(JoinPoint joinPoint) { 
 String methodName = joinPoint.getSignature().getName(); 
 System.out.print("=========== " + methodName); 
 if (methodName.startsWith("get") || methodName.startsWith("count") || methodName.startsWith("find") 
 || methodName.startsWith("list") || methodName.startsWith("select") || methodName.startsWith("check") 
 || methodName.startsWith("query")) { 
 DataSourceContextHolder.setDbType(DATASOURCE_TYPE_SELECT); 
 System.out.println("-----------------使用selectDataSource數(shù)據(jù)源-------------------"); 
 } else { 
 DataSourceContextHolder.setDbType(DATASOURCE_TYPE_UPDATE); 
 System.out.println("-----------------使用updateDataSource數(shù)據(jù)源-------------------"); 
 } 
 } 
}