初识 Proxysql

1.ProxySQL 介绍和安装

ProxySQL 是一种高性能、高可用的开源中间件，适用于mysql和相关的数据库，如MariaDB
官网:http://www.proxysql.com

安装

发行版本下载链接:https://github.com/sysown/proxysql/releases

Ubuntu / Debian:

添加源

apt-get install -y lsb-release
wget -O - 'http://repo.proxysql.com/ProxySQL/repo_pub_key' | apt-key add -
echo deb http://repo.proxysql.com/ProxySQL/proxysql-1.4.x/$(lsb_release -sc)/ ./ \
| tee /etc/apt/sources.list.d/proxysql.list

安装:

apt-get update
apt-get install proxysql OR apt-get install proxysql=version

Red Hat / CentOS:

添加源

cat <<EOF | tee /etc/yum.repos.d/proxysql.repo
[proxysql_repo]
name= ProxySQL YUM repository
baseurl=http://repo.proxysql.com/ProxySQL/proxysql-1.4.x/centos/\$releasever
gpgcheck=1
gpgkey=http://repo.proxysql.com/ProxySQL/repo_pub_key
EOF

安装

yum install proxysql OR yum install proxysql-version

proxysql开启/关闭/重启

开启
service proxysql start

关闭
service proxysql stop

重启
service proxysql restart

管理员交互界面开启和关闭

进入管理界面
# mysql -u admin -padmin -h 127.0.0.1 -P6032 --prompt='Admin> '

开启
Admin> proxysql start;
Query OK, 0 rows affected (0.00 sec)

关闭
Admin> proxysql stop;
ERROR 2013 (HY000): Lost connection to MySQL server during query

重启
Admin> proxysql restart;
ERROR 2013 (HY000): Lost connection to MySQL server during query

Proxysql 架构以及在线修改配置

Proxysql有三层架构，最底层是disk和config file,第二层是memory,最顶层是runtime

当第一次启动时，proxysql会抓取本地配置文件proxy.cnf并且加载至内存z中，并且最终加载到runtime生效，后续如果在线修改了配置后，需要load至runtime层使其生效，如果需要持久化保存，则需要save至磁盘即可

搭建一个最简单的Proxysql

预先安装好proxysql和mysql

proxysql按照上文安装方法就好

mysql安装:(https://www.cnblogs.com/wang-li/p/7726304.html) 

进入proxysql管理界面

# mysql -u admin -padmin -h 127.0.0.1 -P6032 --prompt='Admin> '
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 1
Server version: 5.5.30 (ProxySQL Admin Module)

Copyright (c) 2000, 2018, 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.

Admin>

添加服务器的信息

Admin> INSERT INTO mysql_servers(hostgroup_id,hostname,port) VALUES (1,'127.0.0.1',3306);
Query OK, 1 row affected (0.00 sec)

将数据推到runtime和保存至本地磁盘

Admin> LOAD MYSQL SERVERS TO RUNTIME;
Query OK, 0 rows affected (0.00 sec)

Admin> SAVE MYSQL SERVERS TO DISK;
Query OK, 0 rows affected (0.04 sec)

添加用户信息

Admin> INSERT INTO mysql_users(username,password,default_hostgroup) VALUES ('root','root',1);
Query OK, 1 row affected (0.00 sec)

将数据推到runtime和保存至本地磁盘

Admin> LOAD MYSQL USERS TO RUNTIME;
Query OK, 0 rows affected (0.00 sec)

Admin> save mysql users to disk;
Query OK, 0 rows affected (0.01 sec)

测试proxysql

# mysql -uroot -proot -h 127.0.0.1 -P6033 -e "SELECT @@port"
mysql: [Warning] Using a password on the command line interface can be insecure.
+--------+
| @@port |
+--------+
|   3306 |
+--------+
[root@MiWiFi-R3P-srv proxysql]#