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MYCAT middleware installation and use

2022-07-04 07:24:00 【InfoQ】

One , What is? mycat

A completely open source , Large database cluster for enterprise application development

Support transactions 、ACID、 Can replace MySQL Enhanced database of

One can be regarded as MySQL Enterprise database of cluster , To replace the expensive Oracle colony

A fusion of memory cache technology 、NoSQL technology 、HDFS New big data SQL Server

A new generation of enterprise database products combining traditional database and new distributed data warehouse

A new database middleware product

These are the official instructions . In fact, it is the connection pool of the database .mysql proxy It is also a connection pool , But it's inefficient .

Two ,mycat install

1, Download address mycat

http://dl.mycat.io/

2, install mycat

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

3、 ... and , To configure mycat

1, To configure server.xml

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vim /usr/local/mycat/conf/server.xml // Add the following

<user name= "user" > //mycat user name <property name= "password" >user< /property > //mycat password <property name= "schemas" >mytest< /property > //mycat Virtual database name <property name= "readOnly" > true < /property > // read-only < /user >

<user name= "tankzhang" ><property name= "password" >admin< /property ><property name= "schemas" >mytest< /property >< /user > Be careful here , The default virtual data name is TESTDB, If schema.xml There is no configuration in it testdb, Then you have to testdb Change to schema.xml There are virtual data names . The user name and password defined here , Virtual database name , It's not in mysql The real existence of .

2, To configure schema.xml

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cat schema.xml

<?xml version= "1.0" ?><!DOCTYPE mycat:schema SYSTEM "schema.dtd" ><mycat:schema xmlns:mycat= "http://io.mycat/" >

<schema name= "mytest" checkSQLschema= "false" sqlMaxLimit= "100" dataNode= "my1" /> // Define the virtual database name mytest<dataNode name= "my1" dataHost= "test1" database= "test" /> // Real database name test<dataHost name= "test1" maxCon= "1000" minCon= "10" balance= "1" writeType= "0" dbType= "mysql" dbDriver= "native" ><heartbeat> select user()< /heartbeat ><writeHost host= "hostM1" url= "192.168.5.213:3306" user= "tank" password= "123456" > // How to connect the real database <readHost host= "hostS1" url= "192.168.5.214:3306" user= "tank" password= "123456" /> // ditto < /writeHost >< /dataHost >

< /mycat :schema>mycat Configuration parameters for , Quite a lot . The point is balance="1" And writeType="0"

a. balance Property load balancing type , The current values are 4 Kind of ：

balance="0", Do not turn on the read-write separation mechanism , All read operations are sent to the currently available writeHost On .

balance="1", All of the readHost And stand by writeHost Participate in select Statement load balancing , To put it simply , When dual master dual slave mode (M1 ->S1 , M2->S2, also M1 And M2 Prepare for each other ), Under normal circumstances , M2,S1,S2 All involved select Statement load balancing .

balance="2", All the reading operations are random in writeHost、 readhost To distribute .

balance="3", All read requests are randomly distributed to wiriterHost Corresponding readhost perform ,writerHost No pressure to read , Be careful balance=3 Only in 1.4 And later versions have , 1.3 No, .

b. writeType attribute

Load balancing type , The current values are 3 Kind of ：

writeType="0", All writes are sent to the first of the configuration writeHost, The first one is cut to the second one that still exists

writeHost, After restart, the one that has been switched shall prevail , The switch is recorded in the configuration file :dnindex.properties .

writeType="1", All writes are sent randomly to the configured writeHost.

writeType="2", Not realized .

Specific parameters ：http://mycat.io/document/Mycat_V1.6.0.pdf

3, Configure master and slave servers , I won't say it here , In the blog

4, Add real users

12grant all privileges on test .* to [email protected] "192.168.%" identified by '123456' ;flush privileges stay 213,214 Add users on two machines .

5, Test the real user connection , Make sure schema.xml Real users configured in , Can connect to the real database . Pay attention to the firewall .

Four , start-up mycat

1, Common parameters ./mycat start start-up ./mycat stop stop it ./mycat console The front desk operation ./mycat restart Restart the service ./mycat pause Pause ./mycat status View startup status

2, start-up , And look at mycat

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./mycat start

Starting Mycat-server...

netstat -tpnl |grep 8066

tcp 0 0 :::8066 :::* LISTEN 31728 /java

./mycat status

Mycat-server is running (31726). 5、 ... and , Test read-write separation

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mysql -u tankzhang -p -P 8066 -h 127.0.0.1 // You have to take it 127.0.0.1

Enter password:Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 1Server version: 5.6.29-mycat-1.6-RELEASE-20161028204710 MyCat Server (OpenCloundDB)

Oracle is a registered trademark of Oracle Corporation and /or itsaffiliates. Other names may be trademarks of their respectiveowners.

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

mysql> show databases;+----------+| DATABASE |+----------+| mytest | // Virtual database +----------+1 row in set (0.00 sec)

mysql> use mytest;Reading table information for completion of table and column namesYou can turn off this feature to get a quicker startup with -A

mysql> CREATE TABLE IF NOT EXISTS

user

(->

id

int(11) unsigned NOT NULL DEFAULT '0' COMMENT 'ID' ,->

name

varchar(20) NOT NULL DEFAULT '' COMMENT ' full name ' ,->

create_time

int(10) NOT NULL DEFAULT '0' COMMENT ' Creation time ' ,-> PRIMARY KEY (

id

)-> ) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;Query OK, 0 rows affected (0.08 sec)

Database changedmysql> show tables;+----------------+| Tables_in_test |+----------------+| user |+----------------+1 row in set (0.01 sec)

mysql> INSERT INTO

user

(

id

name

)VALUES ( '1' , 'tank' );Query OK, 1 row affected (0.00 sec)

mysql> select * from user; // Modify from the database user In the table name, You will find that the read is from the database +----+-----------+-------------+| id | name | create_time |+----+-----------+-------------+| 1 | tankzhang | 0 |+----+-----------+-------------+1 row in set (0.01 sec) 6、 ... and , Summary

mycat Support mysql Sub table of , Slicing and so on , But not recommended .mycat Not many clusters are supported , If you can cooperate with mha It's better to use B 了 .

key word ：

java train

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