MySQL maxscale realizes read-write separation

1. If work

Understand and deploy Master slave copy

2. download MaxScale middleware

https://downloads.mariadb.com/MaxScale/

Download Online

wget https://dlm.mariadb.com/1065384/MaxScale/2.3.20/centos/7/x86_64/maxscale-2.3.20-1.centos.7.x86_64.rpm

install

yum -y install maxscale-2.3.20-1.centos.7.x86_64.rpm

3.master Main library creation user

Master slave replication has been realized ： Users created by the main library , Can be synchronized to the slave Library
Create monitoring users

create user 'maxmon'@'%' identified by 'maxmon';
ALTER USER 'maxmon'@'%' IDENTIFIED WITH mysql_native_password BY 'maxmon';
grant replication slave,replication client on *.* to 'maxmon'@'%';

Create routing users

create user 'maxrou'@'%' identified by 'maxrou';
ALTER USER 'maxrou'@'%' IDENTIFIED WITH mysql_native_password BY 'maxrou';
grant all on *.* to 'maxrou'@'%';
flush privileges;

4. To configure MaxScale

vim /etc/maxscale.cnf

find [server1] part , Modify the address and port, Point to master Of IP And port
Copy 2 Time [server1] The whole content of , Change it to [server2] And [server3], Also modify the address and port, Point to respectively slave1 and slave2

[MariaDB-Monitor] part , modify servers by server1,server2,server3, modify user and password Information for previously created monitoring users

Comment out [Read-Only-Service] part , Read and write by maxscale Control is enough

[Read-Write Service] part , modify servers by server1,server2,server3, modify user and password Information for the previously created routing user

notes [Read-Only-Listener] part , stay [MaxAdmin-Listener] Final addition port=6603

5. start-up MaxScale

establish maxscale Related contents , The user is mysql

mkdir /usr/local/mysql/maxscale
mkdir /usr/local/mysql/maxscale/data
mkdir /usr/local/mysql/maxscale/logs
mkdir /usr/local/mysql/maxscale/cache

Under reconfiguration
vim /etc/maxscale.cnf

logdir=/usr/local/mysql/maxscale/logs
datadir=/usr/local/mysql/maxscale/data
piddir=/usr/local/mysql/maxscale/logs
cachedir=/usr/local/mysql/maxscale/cache

start-up , Can't use root User start , Designated here mysql user

maxscale --config=/etc/maxscale.cnf --user=mysql

netstat -ntelp

Sign in MaxScale Manager

maxadmin --user=admin --password=mariadb

View service

list servers

6. test

Create a test user

create user 'rtest'@'%' identified by 'rtest';
ALTER USER 'rtest'@'%' IDENTIFIED WITH mysql_native_password BY 'rtest';
grant select,insert on testdb.* to 'rtest'@'%';
flush privileges;

mysql Connect MaxScale

mysql -urtest -prtest -h'192.168.192.128' -P4006

View the current server name

Select @@hostname;

Open transaction ,MaxScale Switch to master

start transaction;

Roll back

rollback;

Write operations go to the main library , Read operation from the library , It can realize the separation of reading and writing