安装配置
1、安装perl的软件包支持
yum -y install perl perl-devel libaio libaio-devel perl-Time-HiRes perl-DBD-MySQL libev
2、下载proxySQL
https://proxysql.com/
https://github.com/sysown/proxysql/releases
3、 安装
[root@oldboy data]# rpm -ivh proxysql-2.0.4-1-centos7.x86_64.rpm
[root@oldboy data]# proxysql --version
ProxySQL version 2.0.4-116-g7d371cf, codename Truls
4、 启动
启动ProxySQL
[root@oldboy data]# chkconfig proxysql on
[root@oldboy data]# systemctl start proxysql
[root@oldboy data]# systemctl status proxysql
[root@oldboy data]# netstat -lnp|grep proxysql
tcp 0 0 0.0.0.0:6032 0.0.0.0:* LISTEN 3244/proxysql
tcp 0 0 0.0.0.0:6033 0.0.0.0:* LISTEN 3244/proxysql
5、ProxySQL配置文件概览
[root@oldboy data]# egrep -v "^#|^$" /etc/proxysql.cnf
datadir="/var/lib/proxysql"
errorlog="/var/lib/proxysql/proxysql.log"
admin_variables=
{
admin_credentials="admin:admin"
mysql_ifaces="0.0.0.0:6032"
}
mysql_variables=
{
threads=4
max_connections=2048
default_query_delay=0
default_query_timeout=36000000
have_compress=true
poll_timeout=2000
interfaces="0.0.0.0:6033"
default_schema="information_schema"
stacksize=1048576
server_version="5.5.30"
connect_timeout_server=3000
monitor_username="monitor"
monitor_password="monitor"
monitor_history=600000
monitor_connect_interval=60000
monitor_ping_interval=10000
monitor_read_only_interval=1500
monitor_read_only_timeout=500
ping_interval_server_msec=120000
ping_timeout_server=500
commands_stats=true
sessions_sort=true
connect_retries_on_failure=10
}
mysql_servers =
(
)
mysql_users:
(
)
mysql_query_rules:
(
)
scheduler=
(
)
mysql_replication_hostgroups=
(
)
ProxySQL软件结构
proxysql的数据目录
[root@oldboy data]# ll /var/lib/proxysql/
total 312
drwxrwxr-x. 2 proxysql proxysql 6 May 31 15:01 perl5
-rw-rw-r--. 1 proxysql proxysql 1050 May 31 15:01 proxysql-ca.pem
-rw-rw-r--. 1 proxysql proxysql 1058 May 31 15:01 proxysql-cert.pem
-rw-------. 1 proxysql proxysql 163840 May 31 15:01 proxysql.db
-rw-rw-r--. 1 proxysql proxysql 1675 May 31 15:01 proxysql-key.pem
-rw-------. 1 proxysql proxysql 3791 May 31 15:01 proxysql.log
-rw-r--r--. 1 proxysql proxysql 5 May 31 15:01 proxysql.pid
-rw-------. 1 proxysql proxysql 135168 May 31 15:05 proxysql_stats.db
[root@oldboy data]#
ProxySQL内置库介绍
[root@oldboy data]# mysql -uadmin -padmin -h127.0.0.1 -P6032
mysql> 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 (0.00 sec)
mysql>
main库：
内存配置数据库，表里存放后端db实例、用户验证、路由规则等信息。表名以 runtime_开头的表示proxysql当前运行的配置内容，不能通过dml语句修改，只能修改对应的不以 runtime_ 开头的（在内存）里的表，然后LOAD使其生效， SAVE使其存到硬盘以供下次重启加载。
disk库：
是持久化到硬盘的配置库，对应/var/lib/proxysql/proxysql.db文件，也就是sqlite的数据文件。
stats库：
是proxysql运行抓取的统计信息库，包括到后端各命令的执行次数、流量、processlist、查询种类汇总/执行时间等等。
monitor库：
存储monitor模块收集的信息，主要是对后端db的健康、延迟检查。
proxySQL配置应用
添加后端节点
mysql -uadmin -padmin -h127.0.0.1 -P6032
注：配置后端DB 的读写分组(hostgroup_id=0为主，hostgroup_id=1为从)
insert into mysql_servers(hostgroup_id,hostname,port,weight,max_connections,max_replication_lag,comment) values (0,'10.0.0.131',3307,1,300,10,'proxysql');
insert into mysql_servers(hostgroup_id,hostname,port,weight,max_connections,max_replication_lag,comment) values (1,'10.0.0.131',3307,1,3000,10,'proxysql');
insert into mysql_servers(hostgroup_id,hostname,port,weight,max_connections,max_replication_lag,comment) values (1,'10.0.0.131',3308,5,3000,10,'proxysql');
insert into mysql_servers(hostgroup_id,hostname,port,weight,max_connections,max_replication_lag,comment) values (1,'10.0.0.131',3309,5,3000,10,'proxysql');
查询后端节点：
select * from mysql_servers;
proxySQL 配置相关层次结构
image
配置用户后端用户
后端主库创建用户：
mysql> grant all on *.* to mon@'10.0.0.%' identified by '123';
mysql> grant all on *.* to app@'10.0.0.%' identified by '123';
proxySQL中添加用户：
应用用户：
insert into mysql_users(username,password,active,default_hostgroup,transaction_persistent)values
('app','123',1,0,1);
监控用户：
set mysql-monitor_username='mon';
set mysql-monitor_password='123';
配置HG
常用示例：
mysql> insert into mysql_group_replication_hostgroups(writer_hostgroup,backup_writer_hostgroup,reader_hostgroup,offline_hostgroup,active) values(0,2,1,3,1);
配置组策略
insert into mysql_query_rules(rule_id,active,match_digest,destination_hostgroup,apply)values(1,1,'^SELECT.*FOR UPDATE$',0,1);insert into mysql_query_rules(rule_id,active,match_digest,destination_hostgroup,apply)values(2,1,'^SELECT',1,1);
保存配置
load mysql servers to runtime;
load mysql users to runtime;
load mysql variables to runtime;
save mysql servers to disk;
save mysql users to disk;
save mysql variables to disk;load mysql servers to runtime;
测试读写分离
作者：wwwoldguocom
链接：https://www.jianshu.com/p/3e2fde9809a6
来源：简书
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