Users configuration

用户配置是保存在mysql_users表中

备注：在看下面内容之前，确保理解 multi-layer configuration system。

注意：

更新mysql_users表后，不执行LOAD MYSQL USERS TO RUNTIME配置不会立即生效
不执行SAVE MYSQL USERS TO DISK不会持久化到磁盘

All changes in mysql_users table do not take effect immediately, neither are persistent.
Changes to mysql_users are to be considered as editing a config file without saving it or reloading the service.

Copying mysql users from memory to runtime

Admin> LOAD MYSQL USERS TO RUNTIME;

Other alias accepted:

LOAD MYSQL USERS TO RUN
LOAD MYSQL USERS FROM MEM
LOAD MYSQL USERS FROM MEMORY

Copying mysql users from memory to disk

配置持久化到磁盘

Admin> SAVE MYSQL USERS TO DISK;

Other alias accepted:

SAVE MYSQL USERS FROM MEM
SAVE MYSQL USERS FROM MEMORY

Copying mysql users from runtime to memory

配置保存到内存

Admin> SAVE MYSQL USERS TO MEMORY;

Other alias accepted:

SAVE MYSQL USERS TO MEM
SAVE MYSQL USERS FROM RUN
SAVE MYSQL USERS FROM RUNTIME

Copying mysql users from disk to memory

将配置加载到内存

Admin> LOAD MYSQL USERS TO MEMORY;

Other alias accepted:

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LOAD MYSQL USERS TO MEM
LOAD MYSQL USERS FROM DISK

Using encrypted passwords

ProxySQL的用户密码支持hash方式加密，具体内容详见here，在下面的例子中密码是用明文存储，这在测试环境当然是没问题的，但是不能用于生产，生产环境应该用hashed passwords

Creating a new user

通过往mysql_users表中插入记录来创建新用户，注意表中有几列是有默认值的。

 1 Admin> SELECT * FROM mysql_users;
 2 Empty set (0.00 sec)
 3 
 4 Admin> INSERT INTO mysql_users(username,password) VALUES ('user1','password1');
 5 Query OK, 1 row affected (0.00 sec)
 6 
 7 Admin> SELECT * FROM mysql_users;
 8 +----------+-----------+--------+---------+-------------------+----------------+---------------+------------------------+--------------+---------+----------+-----------------+
 9 | username | password  | active | use_ssl | default_hostgroup | default_schema | schema_locked | transaction_persistent | fast_forward | backend | frontend | max_connections |
10 +----------+-----------+--------+---------+-------------------+----------------+---------------+------------------------+--------------+---------+----------+-----------------+
11 | user1    | password1 | 1      | 0       | 0                 | NULL           | 0             | 0                      | 0            | 1       | 1        | 10000           |
12 +----------+-----------+--------+---------+-------------------+----------------+---------------+------------------------+--------------+---------+----------+-----------------+
13 1 row in set (0.00 sec)

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create a new user changing several defaults

根据下面的描述来创建用户：

默认schema为detest1
默认连接到的是10这个主机组的主机

1 Admin> INSERT INTO mysql_users(username,password,default_hostgroup,default_schema) VALUES ('user2','password2',10,'dbtest1');
2 Query OK, 1 row affected (0.00 sec)

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Limiting the number of connections a user can create to proxysql

 1 Admin> SELECT username,max_connections FROM mysql_users;
 2 +----------+-----------------+
 3 | username | max_connections |
 4 +----------+-----------------+
 5 | user1    | 10000           |
 6 | user2    | 10000           |
 7 +----------+-----------------+
 8 2 rows in set (0.00 sec)
 9 
10 Admin> UPDATE mysql_users SET max_connections=100 WHERE username='user2';
11 Query OK, 1 row affected (0.01 sec)
12 
13 Admin> SELECT username,max_connections FROM mysql_users;
14 +----------+-----------------+
15 | username | max_connections |
16 +----------+-----------------+
17 | user1    | 10000           |
18 | user2    | 100             |
19 +----------+-----------------+
20 2 rows in set (0.00 sec)

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Disabling routing across hostgroups once a transaction has started for a specific user

开启一个事务，根据路由规则，可能某些查询会被路由到不同的主机组，为了避免类似情况的发生，可能得启用transaction_persistent，如下例

 1 Admin> SELECT username, transaction_persistent FROM mysql_users;
 2 +----------+------------------------+
 3 | username | transaction_persistent |
 4 +----------+------------------------+
 5 | user1    | 0                      |
 6 | user2    | 0                      |
 7 +----------+------------------------+
 8 2 rows in set (0.00 sec)
 9 
10 Admin> UPDATE mysql_users SET transaction_persistent=1 WHERE username='user2';
11 Query OK, 1 row affected (0.00 sec)
12 
13 Admin> SELECT username, transaction_persistent FROM mysql_users;
14 +----------+------------------------+
15 | username | transaction_persistent |
16 +----------+------------------------+
17 | user1    | 0                      |
18 | user2    | 1                      |
19 +----------+------------------------+
20 2 rows in set (0.00 sec)

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参考文档