海山数据库（He3DB）代理ProxySQL使用详解：（二）功能实测

牛燕飞2024-05-30 0:01

读写分离 实测

ProxySQL官方demo演示了三种读写分离的方式：使用不同的端口进行读写分离、使用正则表达式进行通用的读写分离、使用正则和digest进行更智能的读写分离。最后一种是针对特定业务进行的优化调整，也可将其归结为第二种方式，下边分别进行测试。

基于端口的读写分离

环境准备

  1. MySQL里创建访问用户，监控用户

|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| SQL #创建监控账号 create user monitor@'192.168.31.%' identified with mysql_native_password by '******'; #授权 grant replication client on *.* to monitor@'192.168.31.%' identified by '******' ; #创建访问用户账号 create user proxyadmin@'192.168.31.%' identified with mysql_native_password by '******'; #开放权限 grant all privileges on *.* to proxyadmin@'192.168.31.%'; flush privileges; |

  1. ProxySQL配置mysql节点

|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| SQL ##hostgroup_id, hostname, port 组成一个主键 mysql> select * from mysql_servers; Empty set (0.00 sec) mysql> insert into mysql_servers(hostgroup_id,hostname,port) values(10,'192.168.31.128',5310); Query OK, 1 row affected (0.01 sec) mysql> insert into mysql_servers(hostgroup_id,hostname,port) values(20,'192.168.31.130',5310); Query OK, 1 row affected (0.01 sec) mysql> select * from mysql_servers\G *************************** 1. row *************************** hostgroup_id: 10 hostname: 192.168.31.128 port: 5310 gtid_port: 0 status: ONLINE weight: 1 compression: 0 max_connections: 1000 max_replication_lag: 0 use_ssl: 0 max_latency_ms: 0 comment: *************************** 2. row *************************** hostgroup_id: 20 hostname: 192.168.31.130 port: 5310 gtid_port: 0 status: ONLINE weight: 1 compression: 0 max_connections: 1000 max_replication_lag: 0 use_ssl: 0 max_latency_ms: 0 comment: 2 rows in set (0.00 sec) ##加载到内存 mysql> load mysql servers to runtime; Query OK, 0 rows affected (0.04 sec) ##持久化到磁盘 mysql> save mysql servers to disk; Query OK, 0 rows affected (0.08 sec) |

  1. 使用用户配置，配置mysql_users表

|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| SQL mysql> insert into mysql_users(username,password,default_hostgroup) values('proxyadmin','123qwe',10); Query OK, 1 row affected (0.00 sec) mysql> load mysql users to runtime; Query OK, 0 rows affected (0.01 sec) mysql> save mysql users to disk; Query OK, 0 rows affected (0.02 sec) mysql> select * from mysql_users\G *************************** 1. row *************************** username: proxyadmin password: 123qwe active: 1 use_ssl: 0 default_hostgroup: 10 default_schema: NULL schema_locked: 0 transaction_persistent: 1 fast_forward: 0 backend: 1 frontend: 1 max_connections: 10000 attributes: comment: 1 row in set (0.01 sec) |

  1. 监控用户配置

Monitor模块就会开始监控后端的read_only值，当监控到read_only值后，就会按照read_only的值将某些节点自动移动到读/写组

|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| SQL mysql> set mysql-monitor_username='monitor'; Query OK, 1 row affected (0.00 sec) mysql> set mysql-monitor_password='123qwe'; Query OK, 1 row affected (0.00 sec) mysql> load mysql variables to runtime; Query OK, 0 rows affected (0.02 sec) mysql> save mysql variables to disk; Query OK, 158 rows affected (0.02 sec) |

  1. 配置基于端口的路由规则

写端口通过6401端口，读端口通过6402端口，从而通过不同端口来实现读写分离功能。

|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| SQL INSERT INTO mysql_query_rules (rule_id,active,proxy_port,destination_hostgroup,apply) VALUES (1,1,6401,10,1), (2,1,6402,20,1); mysql> load mysql query rules to runtime; Query OK, 0 rows affected (0.01 sec) mysql> save mysql query rules to disk; Query OK, 0 rows affected (0.03 sec) |

  1. 设置读写分离端口

因端口的修改不能动态加载,需重启ProxySQL实例

|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| SQL mysql> SET mysql-interfaces='0.0.0.0:6401;0.0.0.0:6402'; 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, 158 rows affected (0.01 sec) |

验证

|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| SQL [user@server1 proxysql]$ mysql -uproxyadmin -p***** -P6401 -h127.0.0.1 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 6 Server version: 5.5.30 (ProxySQL) Copyright (c) 2000, 2023, Oracle and/or its affiliates. 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 @@hostname; +------------+ | @@hostname | +------------+ | server1 | +------------+ 1 row in set (0.01 sec) [user@server1 proxysql]$ mysql -uproxyadmin -p***** -P6402 -h127.0.0.1 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 6 Server version: 5.5.30 (ProxySQL) Copyright (c) 2000, 2023, Oracle and/or its affiliates. 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 @@hostname; +------------+ | @@hostname | +------------+ | server2 | +------------+ 1 row in set (0.01 sec) |

测试验证

  • 所有来自于6401端口连接的查询都将被发送到hostgroup为10的组中；
  • 所有来自于6402端口连接的查询都将被发送到hostgroup为20的组中;

配置缺点

  • 该配置需要应用有内置的读写分离功能，以便区分读和写；
  • 通常应用只配置一个单独的入口来连接ProxySQL，这对很多业务来说是不可接受的。
  1. 信息查询

#read_only日志此时也为空(正常来说，新环境配置时，这个只读日志是为空的)

|-------------------------------------------------------------------------|
| Plaintext MySQL [(none)]> select * from mysql_server_read_only_log; |

#replication_lag的监控日志为空

|-------------------------------------------------------------------------------|
| Plaintext MySQL [(none)]> select * from mysql_server_replication_lag_log; |

#注意：可能会有很多connect_error，这是因为没有配置监控信息时的错误，配置后如果connect_error的结果为NULL则表示正常。

|-----------------------------------------------------------------------|
| Plaintext MySQL [(none)]> select * from mysql_server_connect_log; |

#以下是对心跳信息的监控(对ping指标的监控)

|--------------------------------------------------------------------|
| Plaintext MySQL [(none)]> select * from mysql_server_ping_log; |

查看路由的信息，可查询stats库中的stats_mysql_query_digest表。

|----------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Plaintext mysql> select* from stats_mysql_query_digest; mysql>SELECT hostgroup hg, sum_time, count_star, digest_text FROM stats_mysql_query_digest ORDER BY |

  1. 开启web统计功能

查看路由的信息，可查询stats库中的stats_mysql_query_digest表。

|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| SQL mysql> update global_variables set variable_value='true' where variable_name='admin-web_enabled'; Query OK, 1 row affected (0.01 sec) mysql> LOAD ADMIN VARIABLES TO RUNTIME; Query OK, 0 rows affected (0.02 sec) mysql> SAVE ADMIN VARIABLES TO DISK; Query OK, 49 rows affected (0.01 sec) mysql> select * from global_variables where variable_name LIKE 'admin-web%' or variable_name LIKE 'admin-stats%'; +----------------------------------------+----------------+ | variable_name | variable_value | +----------------------------------------+----------------+ | admin-stats_credentials | stats:***** | | admin-stats_mysql_connections | 60 | | admin-stats_mysql_connection_pool | 60 | | admin-stats_mysql_query_cache | 60 | | admin-stats_mysql_query_digest_to_disk | 0 | | admin-stats_system_cpu | 60 | | admin-stats_system_memory | 60 | | admin-web_enabled | true | | admin-web_port | 6080 | | admin-web_verbosity | 0 | +----------------------------------------+----------------+ 10 rows in set (0.00 sec) |

访问http://192.168.31.128:6080并使用stats:****登录即可查看一些统计信息。

基于正则规则的读写分离

开启eventlog

eventslog可以记录用户在通过ProxySQL访问时的所有SQL语句，可以用其观察具体的路由规则，以下为开启方法：

|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| SQL ## 设置eventslog的文件名称 mysql> SET mysql-eventslog_filename='queries.log'; Query OK, 1 row affected (0.00 sec) ## 设置eventslog的格式为json mysql> SET mysql-eventslog_format=2; Query OK, 1 row affected (0.00 sec) ## 加载到runtime层并保存到持久层 mysql> load mysql variables to runtime; Query OK, 0 rows affected (0.00 sec) mysql> save mysql variables to disk; Query OK, 158 rows affected (0.01 sec) |

清除之前创建的查询规则：

|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| SQL mysql> delete from mysql_query_rules; Query OK, 2 rows affected (0.00 sec) mysql> SET mysql-interfaces='0.0.0.0:6033';; 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, 158 rows affected (0.01 sec) ## 延续上面配置,添加查询规则记录eventslog,如下表示对所有的操作都记录 INSERT INTO mysql_query_rules(active, match_digest, log,apply) VALUES(1,'.',1,0); ## 添加基于正则的路由规则 INSERT INTO mysql_query_rules(active,match_digest,destination_hostgroup,apply) VALUES(1,'^SELECT.*FOR UPDATE$',10,1),(1,'^SELECT',20,1); ## 加载配置到运行层并保存配置到持久层 LOAD MYSQL QUERY RULES TO RUNTIME; SAVE MYSQL QUERY RULES TO DISK; |

测试预测

  • 所有的SELECT FOR UPDATE语句将被路由到hostgroup为10的组中；
  • 其他的SELECT语句将被路由到hostgroup为 20的组中；
  • 除以上外的其他语句，将被路由到连接用户默认的hostgroup组中；

测试验证

|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| SQL ## 小写查询（select请求忽略大小写，查看eventslog，该SQL路由到读组20） mysql> select * from sbtest1 limit 1; ## 大写查询（select请求忽略大小写，查看eventslog，该SQL路由到读组20） mysql> SELECT * from sbtest1 limit 1; ## 大小写混合查询（select请求忽略大小写，查看eventslog，该SQL路由到读组20） mysql> SelECT * from sbtest1 limit 1; ## 包含空格的查询（ProxySQL会对包含空格的SQL进行处理，查看eventslog，该SQL路由到读组20） mysql> SelECT * from sbtest1 limit 1; ## 小写查询（select请求忽略大小写，查看eventslog，该SQL路由到写组10） mysql> select * from sbtest1 limit 1 for update; |

ProxySQL集群

proxysql-1:192.168.31.128

proxysql-2:192.168.31.130

  1. 更改所有ProxySQL节点的配置文件

|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| SQL # vim /etc/proxysql.cnf #修改 admin_variables= { admin_credentials="admin:admin;;cluster1:******" # mysql_ifaces="127.0.0.1:6032;/tmp/proxysql_admin.sock" mysql_ifaces="0.0.0.0:6032" # refresh_interval=2000 # debug=true #集群用户名称，与最上面的相同 cluster_username="cluster1" #集群用户密码，与最上面的相同 cluster_password="*******" cluster_check_interval_ms=200 cluster_check_status_frequency=100 cluster_mysql_query_rules_save_to_disk=true cluster_mysql_servers_save_to_disk=true cluster_mysql_users_save_to_disk=true cluster_proxysql_servers_save_to_disk=true cluster_mysql_query_rules_diffs_before_sync=3 cluster_mysql_servers_diffs_before_sync=3 cluster_mysql_users_diffs_before_sync=3 cluster_proxysql_servers_diffs_before_sync=3 } #新增 proxysql_servers= ( { hostname="192.168.31.128" port=6032 weight=1 comment="ProxySQL-node1" }, { hostname="192.168.31.130" port=6032 weight=1 comment="ProxySQL-node2" } ) |

  1. 启动两个节点的ProxySQL服务

注意：

如果存在如果存在"proxysql.db"文件(在/var/lib/proxysql目录下)，则ProxySQL服务只有在第一次启动时才会去读取proxysql.cnf文件并解析；后面启动会就不会读取proxysql.cnf文件了！如果想要让proxysql.cnf文件里的配置在重启proxysql服务后生效(即想要让proxysql重启时读取并解析proxysql.cnf配置文件)，则需要先删除/var/lib/proxysql/proxysql.db数据库文件，然后再重启proxysql服务。这样就相当于初始化启动proxysql服务了，会再次生产一个纯净的proxysql.db数据库文件(如果之前配置了proxysql相关路由规则等，则就会被抹掉)。

  1. 观察集群状况 （两个节点上都可以查看，无特殊说明均在192.168.31.128上操作)）

|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| SQL mysql> select * from proxysql_servers; +----------------+------+--------+----------------+ | hostname | port | weight | comment | +----------------+------+--------+----------------+ | 192.168.31.128 | 6032 | 1 | ProxySQL-node1 | | 192.168.31.130 | 6032 | 1 | ProxySQL-node2 | +----------------+------+--------+----------------+ 2 rows in set (0.00 sec) mysql> select * from stats_proxysql_servers_metrics; +----------------+------+--------+----------------+------------------+----------+---------------+---------+------------------------------+----------------------------+ | hostname | port | weight | comment | response_time_ms | Uptime_s | last_check_ms | Queries | Client_Connections_connected | Client_Connections_created | +----------------+------+--------+----------------+------------------+----------+---------------+---------+------------------------------+----------------------------+ | 192.168.31.130 | 6032 | 1 | ProxySQL-node2 | 0 | 0 | 46226673 | 0 | 0 | 0 | | 192.168.31.128 | 6032 | 1 | ProxySQL-node1 | 9 | 141 | 18414 | 0 | 0 | 0 | +----------------+------+--------+----------------+------------------+----------+---------------+---------+------------------------------+----------------------------+ 2 rows in set (0.00 sec) mysql> select hostname,port,comment,Uptime_s,last_check_ms from stats_proxysql_servers_metrics; +----------------+------+----------------+----------+---------------+ | hostname | port | comment | Uptime_s | last_check_ms | +----------------+------+----------------+----------+---------------+ | 192.168.31.130 | 6032 | ProxySQL-node2 | 0 | 46285888 | | 192.168.31.128 | 6032 | ProxySQL-node1 | 201 | 17332 | +----------------+------+----------------+----------+---------------+ 2 rows in set (0.00 sec) mysql> select hostname,name,checksum,updated_at from stats_proxysql_servers_checksums; +----------------+-------------------+--------------------+------------+ | hostname | name | checksum | updated_at | +----------------+-------------------+--------------------+------------+ | 192.168.31.130 | admin_variables | | 0 | | 192.168.31.130 | mysql_query_rules | | 0 | | 192.168.31.130 | mysql_servers | | 0 | | 192.168.31.130 | mysql_users | | 0 | | 192.168.31.130 | mysql_variables | | 0 | | 192.168.31.130 | proxysql_servers | | 0 | | 192.168.31.128 | admin_variables | 0x6A7FE5E0EFF3CC92 | 1693908720 | | 192.168.31.128 | mysql_query_rules | 0x0000000000000000 | 1693908720 | | 192.168.31.128 | mysql_servers | 0x0000000000000000 | 1693908720 | | 192.168.31.128 | mysql_users | 0x0000000000000000 | 1693908720 | | 192.168.31.128 | mysql_variables | 0x3F6C52D7C3EE3ADD | 1693908720 | | 192.168.31.128 | proxysql_servers | 0x7F9BB0FB6C104089 | 1693908720 | +----------------+-------------------+--------------------+------------+ 12 rows in set (0.00 sec) |

  1. 观察ProxySQL集群中实例之间的数据同步，新增mysql节点

|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| SQL #原有数据 mysql> select * from mysql_servers; Empty set (0.01 sec) # 新增一个后端MySQL主机信息 mysql> insert into mysql_servers(hostgroup_id,hostname,port,comment) values (10,'192.168.31.128',5310,'master_mysql'); Query OK, 1 row affected (0.00 sec) #当前主机查看mysql_servers信息 mysql> select * from mysql_servers\G *************************** 1. row *************************** hostgroup_id: 10 hostname: 192.168.31.128 port: 5310 gtid_port: 0 status: ONLINE weight: 1 compression: 0 max_connections: 1000 max_replication_lag: 0 use_ssl: 0 max_latency_ms: 0 comment: master_mysql 1 row in set (0.01 sec) #另一台主机查看为空 # 持久化，并加载到运行环境中 mysql> save mysql servers to disk; mysql> load mysql servers to runtime; # 再次到另一台proxysql主机上查看，可以看到新插入的数据，发现有这个后端MySQL主机信息，已经被更新到192.168.31.130实例中的memory和runtime环境中。 mysql> select * from mysql_servers\G *************************** 1. row *************************** hostgroup_id: 10 hostname: 192.168.31.128 port: 5310 gtid_port: 0 status: ONLINE weight: 1 compression: 0 max_connections: 1000 max_replication_lag: 0 use_ssl: 0 max_latency_ms: 0 comment: master_mysql 1 row in set (0.01 sec) # 查看另一台proxysql主机日志，会看到同步的具体信息 2023-09-05 20:20:22 [INFO] Cluster: Loading to runtime MySQL Servers from peer 192.168.31.128:6032 2023-09-05 20:20:22 [INFO] Dumping mysql_servers_incoming +--------------+----------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+--------------+ | hostgroup_id | hostname | port | gtid_port | weight | status | compression | max_connections | max_replication_lag | use_ssl | max_latency_ms | comment | +--------------+----------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+--------------+ | 10 | 192.168.31.128 | 5310 | 0 | 1 | 0 | 0 | 1000 | 0 | 0 | 0 | master_mysql | +--------------+----------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+--------------+ |

此时，两节点的proxysql cluster集群搭建完毕

ProxySQL其他功能参考https://proxysql.com/documentation/

作者 简介

丁鹏，中国移动云能力中心数据库产品部分布式数据库高级开发工程师，负责云原生数据库海山（He3DB）分布式版架构设计，拥有丰富的数据库内核开发经验和实践知识。

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