Definition of MariaDB MaxScale
In database server some we need to add load balance between application and database to increase scalability, high availability, and security, so with help of maxscale we can increase scalability, availability, and security of the server, the MariaDB maxscale is acted as database proxy and it is helpful to extend the service of a server that is already mentioned. MariaDB is also helpful to provide more functionality to the user with respect to the database proxy. The MariaDB is configured based on the requirement of the user and technical requirement; we can also modify a database as per the requirement of the user.
Syntax:
create user ‘name of user’ @ ‘maxscale hostname’ indentified by ‘maxscale name’;
Explanation:
In the above syntax, we use the create user statement to create maxscale users with different parameters such as maxscale host name and maxscale identified name as shown in above syntax.
How MaxScale works in MariaDB?
Let’s see how maxscale works in MariaDB, here we will discuss different parameters that are used as follows.
Terms
1.Service:
Service is used to represent a set of databases with specific access that is offered to clients of MariaDB. The specific access means it is used as an algorithm for the direct requests of clients for individual databases.
2. Server:
The server is useful to establish the connection between client and database through the MariaDB maxscale.
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3. Router:
Router is one of the modules in MariaDB that can handle all requests of clients to the different databases and servers.
4. Connecting Routing:
Connection routing is a method that can be capable of handling all requests that MariaDB maxscale accepts from a client for a single database by using a single connection. A Maxscale connection is based on the routing.
5. Statement Routing:
This parameter works in dynamic nature which means it automatically adds the connection or removes the connection from the session. It handles all connections individually.
6. Protocol:
Protocol is used for communication purposes, with the help of protocol we will communicate with another application or software that means it increases flexibility.
7. Module:
Module is dynamically added into the MariaDB maxscale to increase the availability of functionality and it is implemented at run time.
8. Monitor:
The monitor is one of the methods in MariaDB maxscale, in which we monitor the set of databases.
Configuration of MaxScale
Let’s see how we can do the configuration of maxscale as follows.
We can the file location of MariaDB maxscale by using the command line option or we use directory path. During configuration of MariaDB maxscale w uses different parameters as follows.
1. Sizes
In which we define the size of a subset of the IEC binary prefixes. First number multiples by 1024 and latter case as multiple of 1000. So we can define max size as follows.
max_size = number
2. Global Setting
Global setting includes the thread concept, in which we are able to control threads that are handling the event of the kernel. The default thread in maxscale is 1 which means we start maxscale with thread 1 and increase the number of threads as per requirement when we increase size of threads it also increases the performance.
MariaDB maxscale has an auto property that automatically increases the size of thread.
Connection timeout in second, when we increase size of thread it will cause the MariaDB maxscale response time from the backend server. In the global setting we configure different parameters in which the other parameter is write timeout is also in second and by default write time is 2 second but MariaDB maxscale is not able to perform write or modify data.
3. Service
It shows the database service of MariaDB maxscale that it offers to the client. In which it shows a database service that consists of a backend database server and different routing algorithms that route the connection. The service parameter works as a virtual database server that is made available for clients. The service is identified by using the name of service and type parameter of service. When MariaDB forwards any request to the backend server at that time it must have at least one service. Router parameter of service is used to define a router module that establishes connection between clients of MariaDB maxscale and backend server.
Filter option of service is used to define the services. We can define more than one filter name with definition. Multiple filters are separated by using the | character.
Servers’ parameter is used to provide the definition of backend servers.
The user parameter with password is used to connect backend servers to see a list of database users from the backend database.
Password parameter it shows plain text password or encrypted password.
Enable root user is used to control root user of MariaDB maxscale when the value of this parameter is 1 that means it is ON and by default value of this parameter is 0.
4. Server
This parameter is used to define backend database servers. The server has a member of one or more services within MariaDB maxscale. Address is the defined IP address of a database server and it is used to make connections with backend database servers. Port is able to listen to the incoming connections and MariaDB maxscale uses Port number to connect to the database server.
Example
CREATE USER 'sample'@'maxscalehost' IDENTIFIED BY 'abcs123';
Explanation:
In the above example, we use the create user statements to create maxscale users in MariaDB. In the above example, we created a sample user and identified it by using abcs123. The result of the above statement we illustrate by using the following snapshot.
GRANT SELECT ON mysql.user TO 'sample'@'maxscalehost';
Explanation:
With the help of the above statement, we grant permission to the sample user. The result of the above statement we illustrate by using the following snapshot.
Conclusion
We hope from this article you have understood about the MariaDB maxscale. From the above article, we have learned the basic syntax of MariaDB maxscale and we also see different examples of MariaDB maxscale. From this article, we learned how and when we use MariaDB maxscale.
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