MySQL中间件之ProxySQL的安装

1.下载proxySQL，我用的是rpm安装

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

2.安装ProxySQL

[root@qht134 home]# rpm -ivh proxysql-1.4.7-1.1.el6.x86_64.rpm
warning: proxysql-1.4.7-1.1.el6.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID cd2efd2a: NOKEY
Preparing...                ########################################### [100%]
   1:proxysql               ########################################### [100%]

可能遇到的问题：

[root@qht131 home]# rpm -ivh proxysql-1.4.7-1.1.el6.x86_64.rpm
warning: proxysql-1.4.7-1.1.el6.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID cd2efd2a: NOKEY
error: Failed dependencies:
        libcrypto.so.10(OPENSSL_1.0.1)(64bit) is needed by proxysql-1.4.7-1.1.el6.x86_64
        libcrypto.so.10(libcrypto.so.10)(64bit) is needed by proxysql-1.4.7-1.1.el6.x86_64
        libssl.so.10(libssl.so.10)(64bit) is needed by proxysql-1.4.7-1.1.el6.x86_64

通过 yum安装libssl还是报错，最后yum install update更新了所有的内核包后居然可以安装正常了。

3.启动proxysql:

[root@qht134 home]# proxysql --help
High Performance Advanced Proxy for MySQL

USAGE: proxysql [OPTIONS]

OPTIONS:

-c, --config ARG             Configuraton file
-D, --datadir ARG            Datadir
-e, --exit-on-error          Do not restart ProxySQL if crashes
-f, --foreground             Run in foreground
-h, -help, --help, --usage   Display usage instructions.
-M, --no-monitor             Do not start Monitor Module
-n, --no-start               Starts only the admin service
-r, --reuseport              Use SO_REUSEPORT
-S, --admin-socket ARG       Administration Unix Socket
-V, --version                Print version
--idle-threads               Create auxiliary threads to handle idle connections
--initial                    Rename/empty database file
--reload                     Merge config file into database file
--sqlite3-server             Enable SQLite3 Server

[root@qht134 home]# ps -ef | grep proxysql
root     18815     1  0 23:16 ?        00:00:00 proxysql
root     18816 18815  0 23:16 ?        00:00:00 proxysql
root     18840  2865  0 23:17 pts/0    00:00:00 grep proxysql

[root@qht134 /]# service proxysql status
ProxySQL is running (18815).

proxysql安装好后就直接是启动的状态

那他的配置文件在哪里？

[root@qht134 /]# find -name 'proxy*'
./usr/bin/proxysql-status
./usr/bin/proxysql
./usr/bin/proxy
./usr/bin/proxysql_galera_checker
./usr/bin/proxysql_node_monitor
./usr/bin/proxysql-admin
./usr/share/doc/m2crypto-0.20.2/demo/x509/proxy_init.py
./usr/share/doc/m2crypto-0.20.2/demo/x509/proxy_info.py
./usr/share/doc/m2crypto-0.20.2/demo/x509/proxylib.py
./usr/share/doc/m2crypto-0.20.2/demo/x509/proxy_destroy.py
./usr/share/doc/proxysql-1.4.7
./usr/share/man/man8/proxymap.8.gz
./usr/libexec/sssd/proxy_child
./usr/libexec/postfix/proxymap
./usr/lib/python2.6/site-packages/nose/proxy.py
./usr/lib/python2.6/site-packages/nose/proxy.pyo
./usr/lib/python2.6/site-packages/nose/proxy.pyc
./usr/lib/python2.6/site-packages/scservices/dbus/proxy
./proc/sys/net/ipv4/neigh/default/proxy_qlen
./proc/sys/net/ipv4/neigh/default/proxy_delay
./proc/sys/net/ipv4/neigh/lo/proxy_qlen
./proc/sys/net/ipv4/neigh/lo/proxy_delay
./proc/sys/net/ipv4/neigh/eth3/proxy_qlen
./proc/sys/net/ipv4/neigh/eth3/proxy_delay
./proc/sys/net/ipv4/conf/all/proxy_arp
./proc/sys/net/ipv4/conf/all/proxy_arp_pvlan
./proc/sys/net/ipv4/conf/default/proxy_arp
./proc/sys/net/ipv4/conf/default/proxy_arp_pvlan
./proc/sys/net/ipv4/conf/lo/proxy_arp
./proc/sys/net/ipv4/conf/lo/proxy_arp_pvlan
./proc/sys/net/ipv4/conf/eth3/proxy_arp
./proc/sys/net/ipv4/conf/eth3/proxy_arp_pvlan
./proc/sys/net/ipv6/neigh/default/proxy_qlen
./proc/sys/net/ipv6/neigh/default/proxy_delay
./proc/sys/net/ipv6/neigh/eth3/proxy_qlen
./proc/sys/net/ipv6/neigh/eth3/proxy_delay
./proc/sys/net/ipv6/neigh/lo/proxy_qlen
./proc/sys/net/ipv6/neigh/lo/proxy_delay
./proc/sys/net/ipv6/conf/all/proxy_ndp
./proc/sys/net/ipv6/conf/default/proxy_ndp
./proc/sys/net/ipv6/conf/eth3/proxy_ndp
./proc/sys/net/ipv6/conf/lo/proxy_ndp
./var/run/proxysql
./var/spool/postfix/private/proxywrite
./var/spool/postfix/private/proxymap
./var/lib/proxysql
./var/lib/proxysql/proxysql.pid
./var/lib/proxysql/proxysql_stats.db
./var/lib/proxysql/proxysql.log
./var/lib/proxysql/proxysql.db
./etc/proxysql.cnf
./etc/proxysql-admin.cnf
./etc/logrotate.d/proxysql-logrotate
./etc/rc.d/init.d/proxysql
./home/proxysql-1.4.7-1.1.el6.x86_64.rpm

可以看到比较重要的文件，比如文件放在/etc/*.cnf，安装好的数据文件，以及log，pid都放在/var/lib/proxysql下面。

4.登陆proxysql，通过端口6032可以直接登入到proxysql来配置参数 

[root@qht134 home]# mysql -uadmin -padmin -h 127.0.0.1 -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 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.

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> show tables;
+--------------------------------------------+
| tables                                     |
+--------------------------------------------+
| global_variables                           |
| mysql_collations                           |
| mysql_group_replication_hostgroups         |
| mysql_query_rules                          |
| mysql_query_rules_fast_routing             |
| mysql_replication_hostgroups               |
| mysql_servers                              |
| mysql_users                                |
| proxysql_servers                           |
| runtime_checksums_values                   |
| runtime_global_variables                   |
| runtime_mysql_group_replication_hostgroups |
| runtime_mysql_query_rules                  |
| runtime_mysql_query_rules_fast_routing     |
| runtime_mysql_replication_hostgroups       |
| runtime_mysql_servers                      |
| runtime_mysql_users                        |
| runtime_proxysql_servers                   |
| runtime_scheduler                          |
| scheduler                                  |
+--------------------------------------------+
20 rows in set (0.00 sec)

等等，我有点晕，这然道真的不是登入到mysql数据库吗？

真的很像，这样上手这个软件就更加没有难度了。

5.小试牛刀，用proxysql登入数据库试一下

5.1在数据库端创建Proxysql登入的用户：

以下sql是目标数据库中执行的

mysql> CREATE USER 'proxysql'@'%' IDENTIFIED BY 'proxysql';
Query OK, 0 rows affected (0.41 sec)

mysql> grant  usage on *.* to 'proxysql'@'%';
Query OK, 0 rows affected (0.03 sec)

mysql> create user 'sbuser'@'%' IDENTIFIED BY 'sbpass';
Query OK, 0 rows affected (0.00 sec)

mysql> GRANT ALL ON * . * TO 'sbuser'@'%';
Query OK, 0 rows affected (0.00 sec)

mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.07 sec)

5.2 在proxysql端进行配置，将目标数据库以及用户名密码告诉proxysql

mysql> INSERT INTO MySQL_servers(hostgroup_id, hostname, port) VALUES (0,'172.17.61.131',3306);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO MySQL_users(username,password,default_hostgroup) VALUES ('sbuser','sbpass',0);
Query OK, 1 row affected (0.00 sec)

mysql> UPDATE global_variables SET variable_value='proxysql' where variable_name='mysql-monitor_username';
Query OK, 1 row affected (0.00 sec)

mysql> UPDATE global_variables SET variable_value='proxysql' where variable_name='mysql-monitor_password';
Query OK, 1 row affected (0.00 sec)

5.3要配置生效，需要将这些信息传到runtime层和disk层。

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

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

mysql> SAVE MYSQL SERVERS TO DISK;
Query OK, 0 rows affected (0.03 sec)

mysql> SAVE MYSQL USERS TO DISK;
Query OK, 0 rows affected (0.01 sec)

目前了解proxysql有三层架构，runtime层（也是就运行层），memory层（update命令影响到的层)，disk层（配置文件层）。三层的配置可以不同也可以相同，最终系统只识别runtime层的配置。所以要想配置生效，必须将memory层以及disk层的配置导到入runtime层。

5.4 通过端口6033可以登入到已配置好的数据库

[root@qht134 /]# mysql -usbuser -psbpass -h 127.0.0.1 -P 6033 -e "select @@hostname"
mysql: [Warning] Using a password on the command line interface can be insecure.
+------------+
| @@hostname |
+------------+
| qht131     |
+------------+

[root@qht134 /]# mysql -usbuser -psbpass -h 127.0.0.1 -P 6033
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 10
Server version: 5.5.30 (ProxySQL)

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.

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| l5m                |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
5 rows in set (0.24 sec)

mysql> use l5m
Database changed

mysql> show tables;
+---------------+
| Tables_in_l5m |
+---------------+
| test_mgr      |
+---------------+
1 row in set (0.00 sec)

mysql> select * from test_mgr;
+----+
| c1 |
+----+
|  1 |
|  2 |
|  3 |
|  4 |
|  5 |
|  6 |
|  7 |
|  8 |
+----+
8 rows in set (0.04 sec) 

可以的，通过proxysql登入到mysql数据库了！

参考：http://www.fordba.com/mysql_proxysql.html