How to configure a highly available database agent on Linux

How to configure a highly available database proxy on Linux

Abstract:
In modern Internet applications, the database is one of the important components that carries data. In order to ensure high availability and reliability of the database, it is crucial to configure a highly available database agent. This article will describe how to configure a highly available database agent on Linux and provide some code examples.

Introduction:
With the development of Internet applications, databases have become an important component for storing data. When a database fails or is under heavy load, the performance and availability of the entire application is affected. In order to ensure high availability of databases, many companies choose to configure database agents to manage connections and failover of multiple databases. This article will introduce how to configure a highly available database proxy on Linux and provide some sample code.

Step 1: Install database agent software
First, we need to choose a suitable database agent software. In the Linux environment, commonly used database proxy software includes PgBouncer, MaxScale and HAProxy. This article uses PgBouncer as an example.

First, we need to install the PgBouncer software. On Ubuntu, you can install it using the following command:

sudo apt-get install pgbouncer

Step 2: Configure PgBouncer
After the installation is complete, we need to configure PgBouncer for high availability. The configuration file is usually located at /etc/pgbouncer/pgbouncer.ini. Here is a simple example configuration file:

[databases]
mydb = host=your_host port=your_port dbname=your_db user=your_user password=your_password

[pgbouncer]
listen_addr = *
listen_port = 6432
auth_type = trust
auth_file = /etc/pgbouncer/userlist.txt
admin_users = your_admin_user
stats_users = your_stats_user
pool_mode = transaction
server_reset_query = DISCARD ALL

Note that you need to replace the above your_host, your_port, your_db, your_user, your_password, your_admin_user and your_stats_user with actual values.

Step 3: Configure database access permissions
PgBouncer requires a user list file to verify usernames and passwords. Create a file called userlist.txt and write the username and password into it:

your_user:your_password

Note that you need to replace the above your_user and your_password with their actual values.

Step 4: Start PgBouncer
After the configuration is complete, you can start PgBouncer using the following command:

pgbouncer -d /etc/pgbouncer/pgbouncer.ini

Step 5: Connect to the database proxy
Now, you can use PgBouncer as The database agent connects. The connection string is:

host=your_pgbouncer_host port=your_pgboucner_port dbname=your_db user=your_user password=your_password

Note that you need to replace the above your_pgbouncer_host, your_pgboucner_port, your_db, your_user and your_password with the actual values.

Summary:
In this article, we introduced how to configure a highly available database proxy on Linux and provided an example using PgBouncer. Configuring a database agent can improve the availability and performance of your database and ensure the smooth running of your applications. Hope this article is helpful to you!

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