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一、MHA ProxySQL架构
之前发过一篇MHA的文章，介绍了MHA相关的知识和功能测试，连接为：【DB宝19】在Docker中使用MySQL高可用之MHA 。今天这一篇给大家分享一下“MHA 中间件ProxySQL”来实现读写分离 负载均衡的相关知识。
我们都知道，MHA（Master High Availability Manager and tools for MySQL）目前在MySQL高可用方面是一个相对成熟的解决方案，是一套作为MySQL高可用性环境下故障切换和主从提升的高可用软件。它的架构是要求一个MySQL复制集群必须最少有3台数据库服务器，一主二从，即一台充当Master，一台充当备用Master，另一台充当从库。但是，如果不连接任何外部的数据库中间件，那么就会导致所有的业务压力流向主库，从而造成主库压力过大，而2个从库除了本身的IO和SQL线程外，无任何业务压力，会严重造成资源的浪费。因此，我们可以把MHA和ProxySQL结合使用来实现读写分离和负载均衡。所有的业务通过中间件ProxySQL后，会被分配到不同的MySQL机器上。从而，前端的写操作会流向主库，而读操作会被负载均衡的转发到2个从库上。
MHA ProxySQL架构如下图所示：
二、快速搭建MHA环境
2.1 下载MHA镜像
- 小麦苗的Docker Hub的地址：https://hub.docker.com/u/lhrbest
-- 下载镜像
docker pull registry.cn-hangzhou.aliyuncs.com/lhrbest/mha-lhr-master1-ip131
docker pull registry.cn-hangzhou.aliyuncs.com/lhrbest/mha-lhr-slave1-ip132
docker pull registry.cn-hangzhou.aliyuncs.com/lhrbest/mha-lhr-slave2-ip133
docker pull registry.cn-hangzhou.aliyuncs.com/lhrbest/mha-lhr-monitor-ip134
-- 重命名镜像
docker tag registry.cn-hangzhou.aliyuncs.com/lhrbest/mha-lhr-master1-ip131 lhrbest/mha-lhr-master1-ip131
docker tag registry.cn-hangzhou.aliyuncs.com/lhrbest/mha-lhr-slave1-ip132 lhrbest/mha-lhr-slave1-ip132
docker tag registry.cn-hangzhou.aliyuncs.com/lhrbest/mha-lhr-slave2-ip133 lhrbest/mha-lhr-slave2-ip133
docker tag registry.cn-hangzhou.aliyuncs.com/lhrbest/mha-lhr-monitor-ip134 lhrbest/mha-lhr-monitor-ip134一共4个镜像，3个MHA Node，一个MHA Manager，压缩包大概3G，下载完成后：
代码语言：txt复制[root@lhrdocker ~]# docker images | grep mha
registry.cn-hangzhou.aliyuncs.com/lhrbest/mha-lhr-monitor-ip134 latest 7d29597dc997 14 hours ago 1.53GB
registry.cn-hangzhou.aliyuncs.com/lhrbest/mha-lhr-slave2-ip133 latest d3717794e93a 40 hours ago 4.56GB
registry.cn-hangzhou.aliyuncs.com/lhrbest/mha-lhr-slave1-ip132 latest f62ee813e487 40 hours ago 4.56GB
registry.cn-hangzhou.aliyuncs.com/lhrbest/mha-lhr-master1-ip131 latest ae7be48d83dc 40 hours ago 4.56GB2.2 编辑yml文件，创建MHA相关容器
编辑yml文件，使用docker-compose来创建MHA相关容器，注意docker-compose.yml文件的格式，对空格、缩进、对齐都有严格要求：
代码语言：txt复制# 创建存放yml文件的路径
mkdir -p /root/mha
# 编辑文件/root/mha/docker-compose.yml
cat > /root/mha/docker-compose.yml <<"EOF"
version: '3.8'
services:
MHA-LHR-Master1-ip131:
container_name: "MHA-LHR-Master1-ip131"
restart: "always"
hostname: MHA-LHR-Master1-ip131
privileged: true
image: lhrbest/mha-lhr-master1-ip131
ports:
- "33131:3306"
- "2201:22"
networks:
mhalhr:
ipv4_address: 192.168.68.131
MHA-LHR-Slave1-ip132:
container_name: "MHA-LHR-Slave1-ip132"
restart: "always"
hostname: MHA-LHR-Slave1-ip132
privileged: true
image: lhrbest/mha-lhr-slave1-ip132
ports:
- "33132:3306"
- "2202:22"
networks:
mhalhr:
ipv4_address: 192.168.68.132
MHA-LHR-Slave2-ip133:
container_name: "MHA-LHR-Slave2-ip133"
restart: "always"
hostname: MHA-LHR-Slave2-ip133
privileged: true
image: lhrbest/mha-lhr-slave2-ip133
ports:
- "33133:3306"
- "2203:22"
networks:
mhalhr:
ipv4_address: 192.168.68.133
MHA-LHR-Monitor-ip134:
container_name: "MHA-LHR-Monitor-ip134"
restart: "always"
hostname: MHA-LHR-Monitor-ip134
privileged: true
image: lhrbest/mha-lhr-monitor-ip134
ports:
- "33134:3306"
- "2204:22"
networks:
mhalhr:
ipv4_address: 192.168.68.134
networks:
mhalhr:
name: mhalhr
ipam:
config:
- subnet: "192.168.68.0/16"
EOF2.3 安装docker-compose软件（若已安装，可忽略）
- 安装 Docker Compose官方文档：https://docs.docker.com/compose/
- 编辑docker-compose.yml文件官方文档：https://docs.docker.com/compose/compose-file/
[root@lhrdocker ~]# curl --insecure -L https://github.com/docker/compose/releases/download/1.28.4/docker-compose-Linux-x86_64 -o /usr/local/bin/docker-compose
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 638 100 638 0 0 530 0 0:00:01 0:00:01 --:--:-- 531
100 11.6M 100 11.6M 0 0 1994k 0 0:00:06 0:00:06 --:--:-- 2943k
[root@lhrdocker ~]# chmod x /usr/local/bin/docker-compose
[root@lhrdocker ~]# docker-compose -v
docker-compose version 1.28.4, build cabd5cfb2.4 创建MHA容器
代码语言：txt复制# 启动mha环境的容器，一定要进入文件夹/root/mha/后再操作
-- docker rm -f MHA-LHR-Master1-ip131 MHA-LHR-Slave1-ip132 MHA-LHR-Slave2-ip133 MHA-LHR-Monitor-ip134
[root@lhrdocker ~]# cd /root/mha/
[root@lhrdocker mha]#
[root@lhrdocker mha]# docker-compose up -d
Creating network "mhalhr" with the default driver
Creating MHA-LHR-Monitor-ip134 ... done
Creating MHA-LHR-Slave2-ip133 ... done
Creating MHA-LHR-Master1-ip131 ... done
Creating MHA-LHR-Slave1-ip132 ... done
[root@docker35 ~]# docker ps | grep "mha|COMMAND"
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
2978361198b7 lhrbest/mha-lhr-master1-ip131 "/usr/sbin/init" 2 minutes ago Up 2 minutes 16500-16599/tcp, 0.0.0.0:2201->22/tcp, 0.0.0.0:33131->3306/tcp MHA-LHR-Master1-ip131
a64e2e86589c lhrbest/mha-lhr-slave1-ip132 "/usr/sbin/init" 2 minutes ago Up 2 minutes 16500-16599/tcp, 0.0.0.0:2202->22/tcp, 0.0.0.0:33132->3306/tcp MHA-LHR-Slave1-ip132
d7d6ce34800b lhrbest/mha-lhr-monitor-ip134 "/usr/sbin/init" 2 minutes ago Up 2 minutes 0.0.0.0:2204->22/tcp, 0.0.0.0:33134->3306/tcp MHA-LHR-Monitor-ip134
dacd22edb2f8 lhrbest/mha-lhr-slave2-ip133 "/usr/sbin/init" 2 minutes ago Up 2 minutes 16500-16599/tcp, 0.0.0.0:2203->22/tcp, 0.0.0.0:33133->3306/tcp MHA-LHR-Slave2-ip1332.5 主库131添加VIP
代码语言：txt复制# 进入主库131
docker exec -it MHA-LHR-Master1-ip131 bash
# 添加VIP135
/sbin/ifconfig eth0:1 192.168.68.135/24
ifconfig
# 如果删除的话
ip addr del 192.168.68.135/24 dev eth1添加完成后：
代码语言：txt复制[root@MHA-LHR-Master1-ip131 /]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.68.131 netmask 255.255.0.0 broadcast 192.168.255.255
ether 02:42:c0:a8:44:83 txqueuelen 0 (Ethernet)
RX packets 220 bytes 15883 (15.5 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 189 bytes 17524 (17.1 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth0:1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.68.135 netmask 255.255.255.0 broadcast 192.168.68.255
ether 02:42:c0:a8:44:83 txqueuelen 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
loop txqueuelen 1000 (Local Loopback)
RX packets 5 bytes 400 (400.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 5 bytes 400 (400.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
# 管理节点已经可以ping通VIP了
[root@MHA-LHR-Monitor-ip134 /]# ping 192.168.68.135
PING 192.168.68.135 (192.168.68.135) 56(84) bytes of data.
64 bytes from 192.168.68.135: icmp_seq=1 ttl=64 time=0.172 ms
64 bytes from 192.168.68.135: icmp_seq=2 ttl=64 time=0.076 ms
^C
--- 192.168.68.135 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1000ms
rtt min/avg/max/mdev = 0.076/0.124/0.172/0.048 ms到这一步就可以验证主从复制是否正确，若正确，则可以直接测试MHA了。
代码语言：txt复制mysql -uroot -plhr -h192.168.68.131 -P3306
show slave hosts;
mysql> show slave hosts;
----------- ---------------- ------ ----------- --------------------------------------
| Server_id | Host | Port | Master_id | Slave_UUID |
----------- ---------------- ------ ----------- --------------------------------------
| 573306133 | 192.168.68.133 | 3306 | 573306131 | d391ce7e-aec3-11ea-94cd-0242c0a84485 |
| 573306132 | 192.168.68.132 | 3306 | 573306131 | d24a77d1-aec3-11ea-9399-0242c0a84484 |
----------- ---------------- ------ ----------- --------------------------------------
2 rows in set (0.00 sec)
三、配置ProxySQL环境
3.1 申请ProxySQL主机并安装ProxySQL
代码语言：txt复制docker rm -f MHA-LHR-ProxySQL-ip136
docker run -d --name MHA-LHR-ProxySQL-ip136 -h MHA-LHR-ProxySQL-ip136
-v /sys/fs/cgroup:/sys/fs/cgroup
--network mhalhr --ip 192.168.68.136
-p 26032:6032 -p 26033:6033 -p 26080:6080
--privileged=true lhrbest/lhrcentos76:8.0
/usr/sbin/init
docker network connect bridge MHA-LHR-ProxySQL-ip136
docker restart MHA-LHR-ProxySQL-ip136
docker cp proxysql2-2.0.15-1.1.el7.x86_64.rpm MHA-LHR-ProxySQL-ip136:/
docker exec -it MHA-LHR-ProxySQL-ip136 bash
rpm -ivh proxysql2-2.0.15-1.1.el7.x86_64.rpm
systemctl start proxysql
systemctl status proxysql3.2 添加远程登录用户
代码语言：txt复制-- 添加远程登录用户
mysql -uadmin -padmin -h127.0.0.1 -P6032
select @@admin-admin_credentials;
set admin-admin_credentials='admin:admin;root:lhr';
select @@admin-admin_credentials;
load admin variables to runtime;
save admin variables to disk;
-- 远程登录
mysql -uroot -plhr -h192.168.66.35 -P26032执行过程：
代码语言：txt复制-- ProxySQL本地登录
[root@MHA-LHR-ProxySQL-ip136 /]# mysql -uadmin -padmin -h127.0.0.1 -P6032
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 162
Server version: 5.5.30 (ProxySQL Admin Module)
Copyright (c) 2000, 2020, 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> select @@admin-admin_credentials;
---------------------------
| @@admin-admin_credentials |
---------------------------
| admin:admin;lhr:lhr |
---------------------------
1 row in set (0.05 sec)
mysql> set admin-admin_credentials='admin:admin;root:lhr';
Query OK, 1 row affected (0.00 sec)
mysql> select @@admin-admin_credentials;
---------------------------
| @@admin-admin_credentials |
---------------------------
| admin:admin;root:lhr |
---------------------------
1 row in set (0.00 sec)
mysql> load admin variables to runtime;
Query OK, 0 rows affected (0.00 sec)
mysql> save admin variables to disk;
Query OK, 35 rows affected (0.13 sec)
mysql>
-- 远程登录
C:Userslhrxxt>mysql -uroot -plhr -h192.168.66.35 -P26032
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 1045 (28000): ProxySQL Error: Access denied for user 'root'@'172.17.0.1' (using password: YES)
C:Userslhrxxt>mysql -uroot -plhr -h192.168.66.35 -P26032
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 163
Server version: 5.5.30 (ProxySQL Admin Module)
Copyright (c) 2000, 2020, 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 [(none)]> show databases;
----- --------------- -------------------------------------
| seq | name | file |
----- --------------- -------------------------------------
| 0 | main | |
| 2 | disk | /var/lib/proxysql/proxysql.db |
| 3 | stats | |
| 4 | monitor | |
| 5 | stats_history | /var/lib/proxysql/proxysql_stats.db |
----- --------------- -------------------------------------
5 rows in set (0.05 sec)3.3 开启ProxySQL的web监控功能
代码语言：txt复制-- 开启web监控功能
SET admin-web_enabled='true';
LOAD ADMIN VARIABLES TO RUNTIME;
SAVE ADMIN VARIABLES TO DISK;
select * from global_variables where variable_name LIKE 'admin-web_enabled';
select @@admin-web_enabled;
lsof -i:6080
-- 浏览器访问
https://192.168.66.35:26080
用户名和密码：stats:stats
3.4 配置被监控的数据库
3.4.1 向ProxySQL插入被监控数据库
代码语言：txt复制-- 1、向ProxySQL插入被监控数据库
select * from mysql_servers;
insert into main.mysql_servers(hostgroup_id,hostname,port) values(10,'192.168.68.131',3306);
insert into main.mysql_servers(hostgroup_id,hostname,port) values(10,'192.168.68.132',3306);
insert into main.mysql_servers(hostgroup_id,hostname,port) values(10,'192.168.68.133',3306);
load mysql servers to runtime;
save mysql servers to disk;
select * from mysql_servers;
MySQL [(none)]> select * from mysql_servers;
-------------- ---------------- ------ ----------- -------- -------- ------------- ----------------- --------------------- --------- ---------------- ---------
| hostgroup_id | hostname | port | gtid_port | status | weight | compression | max_connections | max_replication_lag | use_ssl | max_latency_ms | comment |
-------------- ---------------- ------ ----------- -------- -------- ------------- ----------------- --------------------- --------- ---------------- ---------
| 10 | 192.168.68.131 | 3306 | 0 | ONLINE | 1 | 0 | 1000 | 0 | 0 | 0 | |
| 10 | 192.168.68.132 | 3306 | 0 | ONLINE | 1 | 0 | 1000 | 0 | 0 | 0 | |
| 10 | 192.168.68.133 | 3306 | 0 | ONLINE | 1 | 0 | 1000 | 0 | 0 | 0 | |
-------------- ---------------- ------ ----------- -------- -------- ------------- ----------------- --------------------- --------- ---------------- ---------
3 rows in set (0.07 sec)3.4.2 在所有被监控MySQL服务器上创建监控帐户
代码语言：txt复制-- 2、在所有被监控MySQL服务器上创建帐户，注意：新版本中，这里的密码必须为monitor，可参考配置文件/etc/proxysql.cnf
mysql -uroot -plhr -h192.168.66.35 -P33131
create user 'monitor'@'%' IDENTIFIED BY 'monitor';
GRANT all privileges ON *.* TO 'monitor'@'%' with grant option;
select user,host from mysql.user;
mysql> select user,host from mysql.user;
--------------- --------------
| user | host |
--------------- --------------
| mha | % |
| monitor | % |
| repl | % |
| root | % |
| mysql.session | localhost |
| mysql.sys | localhost |
| root | localhost |
--------------- --------------
7 rows in set (0.00 sec)3.4.3 在所有被监控MySQL服务器上创建对外访问账户
代码语言：txt复制-- 3、 在所有被监控MySQL服务器上创建对外访问账户：
create user 'wr'@'%' IDENTIFIED BY 'lhr';
GRANT all privileges ON *.* TO 'wr'@'%' with grant option;
-- 配置到ProxySQL中
insert into mysql_users(username,password,default_hostgroup) values('wr','lhr',10);
update mysql_users set transaction_persistent=1 where username='wr';
load mysql users to runtime;
save mysql users to disk;
select * from mysql_users;
MySQL [(none)]> select * from mysql_users;
---------- ---------- -------- --------- ------------------- ---------------- --------------- ------------------------ -------------- --------- ---------- ----------------- ---------
| username | password | active | use_ssl | default_hostgroup | default_schema | schema_locked | transaction_persistent | fast_forward | backend | frontend | max_connections | comment |
---------- ---------- -------- --------- ------------------- ---------------- --------------- ------------------------ -------------- --------- ---------- ----------------- ---------
| wr | lhr | 1 | 0 | 10 | NULL | 0 | 1 | 0 | 1 | 1 | 10000 | |
---------- ---------- -------- --------- ------------------- ---------------- --------------- ------------------------ -------------- --------- ---------- ----------------- ---------
1 row in set (0.05 sec)3.4.4 配置监控
代码语言：txt复制-- 4、在ProxySQL端执行下列SQL语句：
set mysql-monitor_username='monitor';
set mysql-monitor_password='monitor';
load mysql servers to runtime;
save mysql servers to disk;
select * from global_variables where variable_name in('mysql-monitor_username','mysql-monitor_password');
------------------------ ----------------
| variable_name | variable_value |
------------------------ ----------------
| mysql-monitor_password | monitor |
| mysql-monitor_username | monitor |
------------------------ ----------------
2 rows in set (0.05 sec)
-- 检查连接到MySQL的日志
select * from monitor.mysql_server_ping_log order by time_start_us desc limit 6;
select * from monitor.mysql_server_connect_log order by time_start_us desc limit 6;
MySQL [(none)]> select * from monitor.mysql_server_ping_log order by time_start_us desc limit 6;
---------------- ------ ------------------ ---------------------- ------------
| hostname | port | time_start_us | ping_success_time_us | ping_error |
---------------- ------ ------------------ ---------------------- ------------
| 192.168.68.132 | 3306 | 1614050308827202 | 252 | NULL |
| 192.168.68.133 | 3306 | 1614050308716530 | 370 | NULL |
| 192.168.68.131 | 3306 | 1614050308605853 | 542 | NULL |
| 192.168.68.131 | 3306 | 1614050298778908 | 334 | NULL |
| 192.168.68.133 | 3306 | 1614050298690947 | 297 | NULL |
| 192.168.68.132 | 3306 | 1614050298605725 | 344 | NULL |
---------------- ------ ------------------ ---------------------- ------------
6 rows in set (0.06 sec)
MySQL [(none)]> select * from monitor.mysql_server_connect_log order by time_start_us desc limit 6;
---------------- ------ ------------------ ------------------------- ---------------
| hostname | port | time_start_us | connect_success_time_us | connect_error |
---------------- ------ ------------------ ------------------------- ---------------
| 192.168.68.131 | 3306 | 1614050285481316 | 1173 | NULL |
| 192.168.68.133 | 3306 | 1614050284894846 | 1008 | NULL |
| 192.168.68.132 | 3306 | 1614050284309124 | 970 | NULL |
| 192.168.68.131 | 3306 | 1614050225194575 | 1108 | NULL |
| 192.168.68.133 | 3306 | 1614050224751771 | 987 | NULL |
| 192.168.68.132 | 3306 | 1614050224309026 | 1294 | NULL |
---------------- ------ ------------------ ------------------------- ---------------
6 rows in set (0.05 sec)3.4.5 配置MySQL主机组
代码语言：txt复制-- 5、实验使用10作为写入组，20作为读取组。
show create table mysql_replication_hostgroupsG;
writer_hostgroup 写入组的编号
reader_hostgroup 读取组的编号
-- 注意：需要配置从库的read_only=1
show variables like 'read_only';
set global read_only=1;
insert into mysql_replication_hostgroups(writer_hostgroup,reader_hostgroup,comment) values(10,20,'proxy');
load mysql servers to runtime;
save mysql servers to disk;
select * from mysql_replication_hostgroups;
select * from mysql_server_read_only_log order by time_start_us desc limit 3;
select * from mysql_servers;
MySQL [(none)]> select * from mysql_replication_hostgroups;
------------------ ------------------ ------------ ---------
| writer_hostgroup | reader_hostgroup | check_type | comment |
------------------ ------------------ ------------ ---------
| 10 | 20 | read_only | proxy |
------------------ ------------------ ------------ ---------
1 row in set (0.05 sec)
MySQL [(none)]> select * from mysql_server_read_only_log order by time_start_us desc limit 3;
---------------- ------ ------------------ ----------------- ----------- -------
| hostname | port | time_start_us | success_time_us | read_only | error |
---------------- ------ ------------------ ----------------- ----------- -------
| 192.168.68.133 | 3306 | 1614050367153351 | 611 | 1 | NULL |
| 192.168.68.131 | 3306 | 1614050367136396 | 490 | 0 | NULL |
| 192.168.68.132 | 3306 | 1614050367119511 | 531 | 1 | NULL |
---------------- ------ ------------------ ----------------- ----------- -------
3 rows in set (0.05 sec)
MySQL [(none)]> select * from mysql_servers;
-------------- ---------------- ------ ----------- -------- -------- ------------- ----------------- --------------------- --------- ---------------- ---------
| hostgroup_id | hostname | port | gtid_port | status | weight | compression | max_connections | max_replication_lag | use_ssl | max_latency_ms | comment |
-------------- ---------------- ------ ----------- -------- -------- ------------- ----------------- --------------------- --------- ---------------- ---------
| 10 | 192.168.68.131 | 3306 | 0 | ONLINE | 1 | 0 | 1000 | 0 | 0 | 0 | |
| 20 | 192.168.68.132 | 3306 | 0 | ONLINE | 1 | 0 | 1000 | 0 | 0 | 0 | |
| 20 | 192.168.68.133 | 3306 | 0 | ONLINE | 1 | 0 | 1000 | 0 | 0 | 0 | |
-------------- ---------------- ------ ----------- -------- -------- ------------- ----------------- --------------------- --------- ---------------- ---------
3 rows in set (0.05 sec)注意，此时mysql_servers表中的hostgroup_id值已发生变化。
3.4.6 配置读写分离策略
代码语言：txt复制-- 6、配置读写分离策略
insert into mysql_query_rules(active,match_pattern,destination_hostgroup,apply) values(1,'^SELECT.*FOR UPDATE$',10,1);
insert into mysql_query_rules(active,match_pattern,destination_hostgroup,apply) values(1,'^SELECT',20,1);
LOAD MYSQL QUERY RULES TO RUNTIME;
SAVE MYSQL QUERY RULES TO DISK;
-- 配置查询select的请求转发到hostgroup_id=2组上（读组）
-- 针对select * from table_name for update这样的修改语句，我们是需要将请求转到写组，也就是hostgroup_id=1
-- 对于其它没有被规则匹配的请求全部转发到默认的组（mysql_users表中default_hostgroup）
select * from mysql_query_rules;
select username,password,default_hostgroup from mysql_users;
MySQL [(none)]> select * from mysql_query_rules;
--------- -------- ---------- ------------ -------- ------------- ------------ ------------ -------- -------------- ---------------------- ---------------------- -------------- --------- ----------------- ----------------------- ----------- -------------------- --------------- ----------- --------- --------- ------- ------------------- ---------------- ------------------ ----------- -------- ------------- ----------- --------------------- ----- ------- ---------
| rule_id | active | username | schemaname | flagIN | client_addr | proxy_addr | proxy_port | digest | match_digest | match_pattern | negate_match_pattern | re_modifiers | flagOUT | replace_pattern | destination_hostgroup | cache_ttl | cache_empty_result | cache_timeout | reconnect | timeout | retries | delay | next_query_flagIN | mirror_flagOUT | mirror_hostgroup | error_msg | OK_msg | sticky_conn | multiplex | gtid_from_hostgroup | log | apply | comment |
--------- -------- ---------- ------------ -------- ------------- ------------ ------------ -------- -------------- ---------------------- ---------------------- -------------- --------- ----------------- ----------------------- ----------- -------------------- --------------- ----------- --------- --------- ------- ------------------- ---------------- ------------------ ----------- -------- ------------- ----------- --------------------- ----- ------- ---------
| 1 | 1 | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | ^SELECT.*FOR UPDATE$ | 0 | CASELESS | NULL | NULL | 10 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | 1 | NULL |
| 2 | 1 | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | ^SELECT | 0 | CASELESS | NULL | NULL | 20 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | 1 | NULL |
--------- -------- ---------- ------------ -------- ------------- ------------ ------------ -------- -------------- ---------------------- ---------------------- -------------- --------- ----------------- ----------------------- ----------- -------------------- --------------- ----------- --------- --------- ------- ------------------- ---------------- ------------------ ----------- -------- ------------- ----------- --------------------- ----- ------- ---------
2 rows in set (0.05 sec)
MySQL [(none)]> select username,password,default_hostgroup from mysql_users;
---------- ---------- -------------------
| username | password | default_hostgroup |
---------- ---------- -------------------
| wr | lhr | 10 |
---------- ---------- -------------------
1 row in set (0.05 sec)至此，ProxySQL读写分离和负载均衡已配置完成，接下来我们进行测试。
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