读写分离-mycat

读写分离-mycat:

安装mycat:

http://dl.mycat.io/1.6.7.1/Mycat-server-1.6.7.1-release-20190627191042-linux.tar.gz

#下载mycat:
wget http://dl.mycat.io/1.6.7.1/Mycat-server-1.6.7.1-release-20190627191042linux.tar.gz
#解压:
tar xf Mycat-server-1.6.7.1-release-20190627191042-linux.tar.gz  -C /usr/local/ 
#安装java-jdk:
yum install java-1.8.0-openjdk -y
#配置mycat环境变量：
echo "export PATH=/usr/local/mycat/bin:$PATH" > /etc/profile.d/mycat.sh 
. /etc/profile.d/mycat.sh   

数据库授权mycat中间件:

#在主库执行授权信息，从库会自动同步：
Mariadb [(nane)]> grant all on *.* to "mycat-proxy"@"192.168.1.20" ientified by "123456";

备份mycat的核心文件：

cp /mycat-proxy/conf/server.xml /mycat-proxy/conf/server.xml.bak
cp /mycat-proxy/conf/schema.xml /mycat-proxy/conf/schema.xml.bak

配置server.xml文件:

vim /mycat-proxy/conf/server.xml

配置schema.xml文件:

vim /mycat-proxy/conf/schema.xml
# 设置逻辑库以及数据库节点 
<schema name="lutixiadb" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn1"> </schema> 
# 配置数据库节点对应的后端真实的数据库： 
<dataNode name="dn1" dataHost="localhost1" database="students" /> 
# 配置读写库以及均衡： 
     <dataHost name="localhost1" maxCon="1000" minCon="10" balance="0"
                          writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">

        <heartbeat>select user()</heartbeat>
                <!-- can have multi write hosts -->
                <writeHost host="hostM1" url="192.168.1.200:3306" user="mysql-proxy"
                                   password="123456">
                        <!-- can have multi read hosts -->
                        <readHost host="hostS2" url="192.168.1.201:3306" user="mysql-proxy" password="123456" />
                </writeHost>
                <writeHost host="hostS1" url="192.168.1.201:3306" user="mysql-proxy"
                                   password="123456" />

案例：

启动mycat并且查看端口：
mycat start               #需先创建用户 mycat/ mycat-proxy
ps -ef|grep mycat         #端口8066   9066
netstat -nutlp

连接测试：（需要安装mysql客户端工具）

mysql -umycat -p123456 -P8066 -h127.0.0.1
Mariadb [(nane)]> show databases;

mysql -umycat -p123456 -P9066 -h127.0.0.1
Mariadb [(nane)]> show databases;

查看日志：

ps -aux |grep mycat                           #查看mycat启动的目录
tailf /usr/local/mycat/logs/mycat.log         #查看错误日志

查看状态：

show @@datasource;

在后端主库创建表插入数据：

Mariadb[(nane)]> show databases;
Mariadb[(nane)]> use students;
Mariadb[(nane)]> create table t1(id int(10) auto0increment primary key, name varchar(20) jod varchar(20));
Mariadb[(nane)]> insert ti values(1,"xiaoming","it");

mycat继续查询：

mysql -umycat -p123456 -P8066 -h127.0.0.1
show databases;
use lutixiadb;
show tables;