MyCAT实现MySQL数据库读写分离

Posted 2022-03-01 njsummer

3. MyCAT实现mysql读写分离

3.1 架构图及环境说明

四台服务器
1  主节点：
MariaDB-Master
CentOS 8.4
IP: 192.168.250.18/24
10.3.28-MariaDB

2  从节点：
MariaDB-Slave
CentOS 8.4
IP: 192.168.250.28/24
10.3.28-MariaDB

3  MyCAT服务器：
Mycat-Server
CentOS 8.4
IP: 192.168.250.8/24
Mycat-server-1.6.7.6

4  Clinet客户端：
Client-CentOS79
CentOS 7.9
IP: 192.168.250.7/24
10.3.28-MariaDB  用其client

3.2 主从复制配置

3.2.1 主节点

###   MariaDB主节点 IP192.168.250.18
[root@CentOS84 ]#hostnamectl set-hostname MariaDB-Master
[root@CentOS84 ]#exit
# 退出后重新登录
[root@MariaDB-Master ]#hostname
MariaDB-Master
[root@MariaDB-Master ]#hostname -I
192.168.250.18
# 验证SELinux和防火墙已经关闭
[root@MariaDB-Master ]#getenforce
Disabled
[root@MariaDB-Master ]#systemctl status firewalld
● firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled)
   Active: inactive (dead)
     Docs: man:firewalld(1)
# 时间同步设置
[root@MariaDB-Master ]#systemctl enable --now  chronyd.service
Created symlink /etc/systemd/system/multi-user.target.wants/chronyd.service → /usr/lib/systemd/system/chronyd.service.
# 安装mariadb-server
[root@MariaDB-Master ]#dnf -y install mariadb-server
[root@MariaDB-Master ]#vim /etc/my.cnf.d/mariadb-server.cnf
# 配置文件增加下面两行
[mysqld]
server-id=18
log-bin                                                                             

[root@MariaDB-Master ]#systemctl enable --now mariadb
[root@MariaDB-Master ]#systemctl status mariadb
# 验证3306端口监听  
[root@MariaDB-Master ]#ss -tln
State     Recv-Q   Send-Q    Local Address:Port      Peer Address:Port    Process
LISTEN    0        80        *:3306                  *:*                            

[root@MariaDB-Master ]#mysql
Welcome to the MariaDB monitor.  Commands end with ; or \\g.
Your MariaDB connection id is 9
Server version: 10.3.28-MariaDB-log MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

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

MariaDB [(none)]> show master logs;
+--------------------+-----------+
| Log_name           | File_size |
+--------------------+-----------+
| mariadb-bin.000001 |     28259 |
| mariadb-bin.000002 |       344 |    #记录下这行的值，在从节点配置需要用
+--------------------+-----------+
2 rows in set (0.000 sec)

# 创建复制账户
MariaDB [(none)]> grant replication slave on *.* to repluser@192.168.250.% identified by shone;
Query OK, 0 rows affected (0.001 sec)
# 验证复制账户
MariaDB [(none)]> SELECT DISTINCT CONCAT(User: ,user,@,host,;) AS query FROM mysql.user;
+-----------------------------------+
| query                             |
+-----------------------------------+
| User: root@127.0.0.1;         |
| User: repluser@192.168.250.%; |
| User: root@::1;               |
| User: root@localhost;         |
| User: root@mariadb-master;    |
+-----------------------------------+
5 rows in set (0.001 sec)

MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
+--------------------+
3 rows in set (0.001 sec)

# 导入一个用于实验的 hellodb_innodb.sql 数据库
[root@MariaDB-Master ]#rz
rz waiting to receive.
Starting zmodem transfer.  Press Ctrl+C to cancel.
Transferring hellodb_innodb.sql...
  100%       7 KB       7 KB/sec    00:00:01       0 Errors  

[root@MariaDB-Master ]#ll
-rw-r--r--  1 root root 7786 Sep  1 18:14 hellodb_innodb.sql

#这个步骤再完成从节点配置后，在主节点导入hellodb_innodb.sql数据库，并在从节点验证复制情况
[root@MariaDB-Master ]#mysql < hellodb_innodb.sql
[root@MariaDB-Master ]#

# 创建用户并对mycat授权，用于mycat代理连接后端时用的账户和密&码，必须和mycat的/apps/mycat/conf/schema.xml这个文件内的配置一致
[root@MariaDB-Master ]#mysql
Welcome to the MariaDB monitor.  Commands end with ; or \\g.
Your MariaDB connection id is 13
Server version: 10.3.28-MariaDB-log MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

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

MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| hellodb            |
| information_schema |
| mysql              |
| performance_schema |
+--------------------+
4 rows in set (0.001 sec)

MariaDB [(none)]> 


MariaDB [(none)]> create database mycat;
Query OK, 1 row affected (0.001 sec)

MariaDB [(none)]> GRANT ALL ON *.* TO root@192.168.250.% IDENTIFIED BY host123456 ;
Query OK, 0 rows affected (0.001 sec)

MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.001 sec)

MariaDB [(none)]> SELECT DISTINCT CONCAT(User: ,user,@,host,;) AS query FROM mysql.user;
+--------------mycat实现MySQL读写分离

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