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ProxySQL读写分离
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.logmanager_workdir=/var/log/mha/app1.logmaster_binlog_dir=/home/mysql/db3306/log/master_ip_failover_script=/usr/local/bin/master_ip_failovermaster_ip_online_change_script=/usr/local/bin/master_ip_online_changepassword=123456ping_interval=1remote_workdir=/tmprepl_password=123456repl_user=rootreport_script=/usr/local/bin/send_reportshutdown_script=""ssh_user=rootuser=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.el6Complete!
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 proxysqlexport CLUSTER_APP_USERNAME="proxysql_user"export CLUSTER_APP_PASSWORD="passw0rd" # ProxySQL read/write hostgroupexport 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 --enableThis script will assist with configuring ProxySQL (currently only Percona XtraDB cluster in combination with ProxySQL is supported)ProxySQL read/write configuration mode is singlewriteProxySQL 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 proxyproxy proxysql proxysql-admin proxysql_galera_checker proxysql_node_monitor[root@localhost bin]# service proxysql startStarting ProxySQL: DONE![root@localhost bin]# mysql -uadmin -padmin -h127.0.0.1 -P6032mysql: [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 itsaffiliates. Other names may be trademarks of their respectiveowners.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 -P6032mysql: [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 itsaffiliates. Other names may be trademarks of their respectiveowners. 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 adminDatabase changedmysql> 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 -P6033mysql: [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 itsaffiliates. Other names may be trademarks of their respectiveowners.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;
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;
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。
ProxySQL读写分离
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