mycat实现读写分离---未完成

实验架构：

master      192.168.0.92        mysql 

slave     192.168.0.93        mysql

mycat     192.168.0.94        mycat  jdk

client    192.168.0.95        mysql


1、环境配置 参照：https://www.cnblogs.com/effortsing/p/10367025.html

2、配置mysql实现主从复制 参照: https://www.cnblogs.com/effortsing/p/10367257.html

3、安装jdk 参照：https://www.cnblogs.com/effortsing/p/10012211.html


4、安装mycat实现读写分离


tar zxf Mycat-server-1.6-RELEASE-20161028204710-linux.tar.gz -C /usr/local

cat>>/etc/profile<<EOF
export MYCAT_HOME=/usr/local/mycat
export PATH=$PATH:/usr/local/mycat/bin
EOF
source /etc/profile



配置server.xml

打开文件，搜索password定位修改

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

        <user name="root">
                <property name="password">jenkins@123</property>     # 这里的用户名密码是要访问的mysql的用户名密码
                <property name="schemas">TESTDB</property>           # 这是原先自带的全局表数据库名，不要动，否则mycat无法启动



配置schema.xml

搜索 writeType 进行定位修改

vi /usr/local/mycat/conf/schema.xml


        <dataHost name="localhost1" maxCon="1000" minCon="10" balance="1"                                           #这里改成1，表示开启读写分离模式
                          writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
                <heartbeat>select user()</heartbeat>
                <!-- can have multi write hosts -->
                <writeHost host="hostM1" url="192.168.0.92:3306" user="jenkins@123"                                 #这里填写主库的地址和mysql的登录密码
                                   password="123456">
                        <!-- can have multi read hosts -->
                        <readHost host="hostS2" url="192.168.0.93:3306" user="root" password="jenkins@123" />       #这里填写主库的地址和mysql的登录密码
                </writeHost>


说明：schema.xml里面其他的内容不要乱动



启动mycat

mycat start

[root@test4 ~]# mycat start
Starting Mycat-server...



查看mycat状态

mycat status

[root@test4 ~]# mycat status
Mycat-server is running (3646).



停止mycat

mycat stop

[root@test4 ~]# mycat stop
Stopping Mycat-server...
Stopped Mycat-server.



查看报错日志:

cat /usr/local/mycat/logs/wrapper.log



查看端口

[root@test4 ~]#  netstat -tnlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 127.0.0.1:32000         0.0.0.0:*               LISTEN      3648/java           
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      938/sshd            
tcp6       0      0 :::1984                 :::*                    LISTEN      3648/java           
tcp6       0      0 :::8066                 :::*                    LISTEN      3648/java              # mycat登录端口         
tcp6       0      0 :::34727                :::*                    LISTEN      3648/java           
tcp6       0      0 :::9066                 :::*                    LISTEN      3648/java           
tcp6       0      0 :::44438                :::*                    LISTEN      3648/java           
tcp6       0      0 :::22                   :::*                    LISTEN      938/sshd    




客户端192.168.0.95 验证读写分离


说明：登录到mycat无法同步过来主库里面的数据库test，怎么改也不行，暂时先不解决了



登录到连接端口

其中8066是mycat的监听端口，类似于mysql的3306端口，其中-u，-p，-h分别是用户名，密码和主机，-D是连接的逻辑库

[root@test5 script]# mysql -h 192.168.0.94 -P 8066 -uroot -pjenkins@123 -DTEST
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.29-mycat-1.6-RELEASE-20161028204710 MyCat Server (OpenCloundDB)

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show databases;
+----------+
| DATABASE |
+----------+
| TESTDB   |
+----------+
1 row in set (0.02 sec)



登录管理端口

[root@test5 script]# mysql -h 192.168.0.94 -P 9066 -uroot -pjenkins@123
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.6.29-mycat-1.6-RELEASE-20161028204710 MyCat Server (monitor)

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> exit





报错解决：Caused by: io.mycat.config.util.ConfigException: SelfCheck###  schema test refered by user root is not exist!

原因是server.xml里面的数据库写成了小写，必须改成大写

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

<user name="root">
<property name="password">jenkins@123</property>     # 这里的用户名密码是要访问的mysql的用户名密码
<property name="schemas">TEST</property>              # 要测试的数据库,不要用小写，必须大写，否则mycat启动失败，其他的不要动



参照文档：

http://blog.51cto.com/13598811/2087379

http://blog.51cto.com/12323501/2151261

https://www.jianshu.com/p/26513f428ecf


https://www.cnblogs.com/lyming/p/8573869.html