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ProxySQL读写分离从设置到使用

发表时间：2023-08-01 来源：明辉站整理相关软件相关文章人气：

[摘要]在美团点评DBProxy读写分离使用说明文章中已经说明了使用目的，本文介绍ProxySQL的使用方法以及和DBProxy的性能差异。具体的介绍可以看官网的相关说明，并且这个中间件也是percona推...
在美团点评DBProxy读写分离使用说明文章中已经说明了使用目的，本文介绍ProxySQL的使用方法以及和DBProxy的性能差异。具体的介绍可以看官网的相关说明，并且这个中间件也是percona推的一款中间件。其特性和其他读写分离的中间件差距不大，具体的会在文中介绍。本文大致简单的介绍在使用过程中的一些说明，也可以看官方的wiki获得使用帮助。

环境：

Distributor ID： Ubuntu
Description： Ubuntu 14.04.5 LTS
Release： 14.04Codename： trusty

下载

percona站点：

https：//www.percona.com/downloads/proxysql/

github/官网：

https：//github.com/sysown/proxysql/releases



我们首先看一下自己的环境：

MHA已经搭建：
master：172.16.16.35:3306slave：172.16.16.35:3307slave：172.16.16.34:3307

MHA manager在172.16.16.34，配置文件如下：

[root@localhost bin]# cat /etc/masterha/app1.cnf
[server default]
manager_log=/var/log/mha/app1/manager.log
manager_workdir=/var/log/mha/app1.log
master_binlog_dir=/home/mysql/db3306/log/master_ip_failover_script=/usr/local/bin/master_ip_failover
master_ip_online_change_script=/usr/local/bin/master_ip_online_change
password=123456ping_interval=1remote_workdir=/tmp
repl_password=123456repl_user=root
report_script=/usr/local/bin/send_report
shutdown_script=""ssh_user=root
user=root
[server1]
hostname=172.16.16.35port=3306[server2]
candidate_master=1check_repl_delay=0hostname=172.16.16.34port=3306[server3]
hostname=172.16.16.35port=3307

下面我们基于这样一套MHA环境搭建读写分离。
1：安装ProxySQL软件，这个我们部署到172.16.16.34上
[root@localhost bin]# sudo yum install http://www.percona.com/downloads/percona-release/redhat/0.1-4/percona-release-0.1-4.noarch.rpm[root@localhost bin]# yum install proxysql

最后有以下提示：
Installed:
proxysql.x86_64 0:1.3.7-1.1.el6
Complete!

也就是安装完成了。然后查一下具体的文件：
[root@localhost bin]# find / -name proxysql/var/lib/proxysql/var/run/proxysql/etc/rc.d/init.d/proxysql/usr/bin/proxysql

发现确实已经将ProxySQL安装成功了
2：启动配置ProxySQL
看一下配置文件：
[root@localhost bin]# cat /etc/proxysql-admin.cnf
# proxysql admin interface credentials.
export PROXYSQL_USERNAME="admin"export PROXYSQL_PASSWORD="admin"export PROXYSQL_HOSTNAME="localhost"export PROXYSQL_PORT="6032"
 # PXC admin credentials for connecting to pxc-cluster-node.
export CLUSTER_USERNAME="admin"export CLUSTER_PASSWORD="admin"export CLUSTER_HOSTNAME="localhost"export CLUSTER_PORT="3306"
 # proxysql monitoring user. proxysql admin script will create this user in pxc to monitor pxc-nodes.
export MONITOR_USERNAME="monitor"export MONITOR_PASSWORD="monit0r"
 # Application user to connect to pxc-node through proxysql
export CLUSTER_APP_USERNAME="proxysql_user"export CLUSTER_APP_PASSWORD="passw0rd"
 # ProxySQL read/write hostgroup
export WRITE_HOSTGROUP_ID="10"export READ_HOSTGROUP_ID="11"
 # ProxySQL read/write configuration mode.
export MODE="singlewrite"

启动：
[root@localhost bin]# proxysql-admin --config-file=/etc/proxysql-admin.cnf --enable
This script will assist with configuring ProxySQL (currently only Percona XtraDB cluster in combination with ProxySQL is supported)
ProxySQL read/write configuration mode is singlewrite
ProxySQL is not running; please start the proxysql service

现在来说ProxySQL 的路由已经启动，提示我们要启动proxysql service
[root@localhost bin]# service proxy
proxy proxysql proxysql-admin proxysql_galera_checker proxysql_node_monitor
[root@localhost bin]# service proxysql start
Starting ProxySQL: DONE![root@localhost bin]# 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 1Server version: 5.7.14 (ProxySQL Admin Module)
Copyright (c) 2000, 2016, 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>

可以看到我们已经登录成功了，这里要说明的是 proxysql的默认配置文件是在：
[root@localhost bin]# find / -name proxysql.cnf/etc/proxysql.cnf

接下来我们开始配置ProxySQL：
[root@localhost bin]# 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 2Server version: 5.7.14 (ProxySQL Admin Module)
 
Copyright (c) 2000, 2016, 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> show databases;+-----+---------+-------------------------------+
  seq   name   file  
+-----+---------+-------------------------------+
  0   main    
  2   disk   /var/lib/proxysql/proxysql.db  
  3   stats    
  4   monitor    
+-----+---------+-------------------------------+4 rows in set (0.00 sec)
 
mysql> use admin
Database changed
mysql> show tables;+--------------------------------------+
  tables  
+--------------------------------------+
  global_variables  
  mysql_collations  
  mysql_query_rules  
  mysql_replication_hostgroups  
  mysql_servers  
  mysql_users  
  runtime_global_variables  
  runtime_mysql_query_rules  
  runtime_mysql_replication_hostgroups  
  runtime_mysql_servers  
  runtime_mysql_users  
  runtime_scheduler  
  scheduler  
+--------------------------------------+13 rows in set (0.00 sec)

下面加入主从信息：
mysql> insert into mysql_servers(hostgroup_id,hostname,port,weight,max_connections,max_replication_lag,comment) values(100,'172.16.16.35',3306,1,1000,10,'test');
Query OK, 1 row affected (0.00 sec)
mysql> insert into mysql_servers(hostgroup_id,hostname,port,weight,max_connections,max_replication_lag,comment) values(101,'172.16.16.34',3306,1,1000,10,'test');
Query OK, 1 row affected (0.00 sec)
mysql> insert into mysql_servers(hostgroup_id,hostname,port,weight,max_connections,max_replication_lag,comment) values(101,'172.16.16.35',3307,1,1000,10,'test');
Query OK, 1 row affected (0.00 sec)
mysql> select * from mysql_servers;+--------------+--------------+------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+
  hostgroup_id   hostname   port   status   weight   compression   max_connections   max_replication_lag   use_ssl   max_latency_ms   comment  
+--------------+--------------+------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+
  100   172.16.16.35   3306   ONLINE   1   0   1000   10   0   0   test  
  101   172.16.16.34   3306   ONLINE   1   0   1000   10   0   0   test  
  101   172.16.16.35   3307   ONLINE   1   0   1000   10   0   0   test  
+--------------+--------------+------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+3 rows in set (0.00 sec)

然后添加读写映射（主要是MHA后端切换的时候保证ProxySQL也能够自动切换）：
mysql> insert into mysql_replication_hostgroups values(100,101,'masterha') ;
Query OK, 1 row affected (0.00 sec)
mysql> select * from mysql_replication_hostgroups;+------------------+------------------+----------+
  writer_hostgroup   reader_hostgroup   comment  
+------------------+------------------+----------+
  100   101   masterha  
+------------------+------------------+----------+1 row in set (0.00 sec)

为ProxySQL添加监控账号：
mysql> GRANT SUPER, REPLICATION CLIENT ON *.* TO 'proxysql'@'172.16.16.%' IDENTIFIED BY 'proxysql';
Query OK, 0 rows affected, 1 warning (0.09 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.10 sec)

配置监控账号（在proxySQL当中进行配置）：
mysql> set mysql-monitor_username='proxysql';
Query OK, 1 row affected (0.00 sec)
mysql> set mysql-monitor_password='proxysql';
Query OK, 1 row affected (0.00 sec)
mysql> load mysql variables to runtime;
Query OK, 0 rows affected (0.00 sec)
mysql> save mysql variables to disk;
Query OK, 74 rows affected (0.02 sec)

PS:有时候runtime_mysql_servers的status不为ONLINE状态的话可以通过查看monitor.mysql_server_ping_log这个表来查看具体的报错信息。
mysql> select * from monitor.mysql_server_ping_log;
然后配置程序账号，简单点统一使用root：123456最高权限来配置：
mysql> insert into mysql_users(username,password,active,default_hostgroup,transaction_persistent) values('root','123456',1,100,1);
Query OK, 1 row affected (0.00 sec)
mysql> select * from mysql_users;+----------+----------+--------+---------+-------------------+----------------+---------------+------------------------+--------------+---------+----------+-----------------+
  username   password   active   use_ssl   default_hostgroup   default_schema   schema_locked   transaction_persistent   fast_forward   backend   frontend   max_connections  
+----------+----------+--------+---------+-------------------+----------------+---------------+------------------------+--------------+---------+----------+-----------------+
  root   123456   1   0   100   NULL   0   1   0   1   1   10000  
+----------+----------+--------+---------+-------------------+----------------+---------------+------------------------+--------------+---------+----------+-----------------+1 row in set (0.00 sec)

配置完成以后开始重新加载和保存我们的配置：
mysql> load mysql servers to runtime;
Query OK, 0 rows affected (0.01 sec)
mysql> save mysql servers to disk;
Query OK, 0 rows affected (0.08 sec)
mysql> load mysql users to runtime;
Query OK, 0 rows affected (0.00 sec)
mysql> save mysql users to disk;
Query OK, 0 rows affected (0.03 sec)

接下来开始配置路由规则：
mysql> INSERT INTO mysql_query_rules(active,match_pattern,destination_hostgroup,apply) VALUES(1,'^SELECT.*FOR UPDATE$',100,1);
Query OK, 1 row affected (0.01 sec)
mysql> INSERT INTO mysql_query_rules(active,match_pattern,destination_hostgroup,apply) VALUES(1,'^SELECT',101,1);
Query OK, 1 row affected (0.00 sec)
mysql> LOAD MYSQL QUERY RULES TO RUNTIME;
Query OK, 0 rows affected (0.00 sec)
mysql> SAVE MYSQL QUERY RULES TO DISK;
Query OK, 0 rows affected (0.04 sec)

至此配置已经完成了
3：测试读写分离
在172.16.16.35上链接proxySQL端口6033，并且做简单的select操作：
[root@localhost ~]# mysql -uroot -p123456 -h172.16.16.34 -P6033
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 22Server version: 5.7.14 (ProxySQL)
Copyright (c) 2000, 2016, 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 * from maxiangqian.test;+-----+------+
  id   name  
+-----+------+
  1   qq  
  2   qq  
  4   aa  
  11   a  
  111   a  
+-----+------+5 rows in set (0.04 sec)

然后在进行查询看一下：
mysql> select * from stats_mysql_query_digest;

ProxySQL读写分离从配置到使用

可以看到已经完成了读写分离了。
mysql> select @@server_id;+-------------+
  @@server_id  
+-------------+
  353307  
+-------------+1 row in set (0.01 sec)

查看一下server ID已经路由到了172.16.16.35:3307这个从库上了。
测一下for update：
mysql> select * from maxiangqian.test for update;+-----+------+
  id   name  
+-----+------+
  1   qq  
  2   qq  
  4   aa  
  11   a  
  111   a  
+-----+------+5 rows in set (0.00 sec)

再查看
mysql> select * from stats_mysql_query_digest;

ProxySQL读写分离从配置到使用

已经自动路由到了主库。
至此ProxySQL+MySQL MHA读写分离测试完成。。。未完待续
5：关于ProxySQL的思考以及简单的命令
ProxySQL通过以上方式是可以实现读写分离，但是这种方式真的就没有问题了吗，如果是一些比如查询订单状态的这种要求实时性非常高的SQL的话，似乎被路由到了从库就会出现BUG。我们可以选择在程序端控制这些参数，ProxySQL只作为一个负载均衡来使用，给ProxySQL创建多个账号，一个读写，一个只读。然后程序去实现读写分离。
ProxySQL是分三层来设计运行的，分别为RUNTIME ，MEMORY ，DISK ：
RUNTIME 代表的是ProxySQL当前生效的配置，包括 global_variables, mysql_servers, mysql_users, mysql_query_rules。无法直接修改这里的配置，必须要从下一层load进来。
MEMORY 是平时在mysql命令行修改的 main 里头配置，可以认为是SQLite数据库在内存的镜像
DISK / CONFIG FILE 持久存储的那份配置，一般在$(DATADIR)/proxysql.db，在重启的时候会从硬盘里加载。 /etc/proxysql.cnf文件只在第一次初始化的时候用到，完了后，如果要修改监听端口，还是需要在管理命令行里修改，再 save 到硬盘
常用命令：
LOAD MYSQL SERVERS TO RUNTIME -- 让修改的配置生效，也就是从MEMORY 把参数LOAD过来，等价于LOAD MYSQL USERS FROM MEMORY，这个语句的语法比较单间，FROM代表从上层LOAD过来，TO代表从本层到某一个层。比如前面我们设置了MySQL的监控账号，但是还是要执行LOAD和SAVE保存变量并且使变量生效。

以上就是ProxySQL读写分离从配置到使用的详细内容，更多请关注php中文网其它相关文章！


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