How to set up highly available database replication on Linux

How to set up high-availability database replication on Linux

Abstract:
In modern Internet applications, high availability of databases is very important, especially for online transactions, real-time data analysis, etc. For key business scenarios. Database replication is a common way to achieve database high availability. This article will introduce how to set up highly available database replication on the Linux operating system to improve system availability and fault tolerance.

1. Make sure the database server is configured correctly
   Before you start setting up database replication, first make sure the database server is configured correctly. This includes the following aspects:
2. Operating system: Choose a stable and reliable Linux distribution as the operating system of the database server, such as CentOS, Ubuntu, etc.
3. Memory and disk: Allocate sufficient memory and disk space to the database server to ensure that the system can handle a large number of concurrent read and write operations.
4. Database software: Choose reliable and mature database software, such as MySQL, PostgreSQL, etc.
5. Network configuration: Configure network parameters to ensure that the database server can communicate normally.
6. Installing and configuring database software
   Installing and configuring database software on the Linux operating system is the first step. The following is a sample code to install and configure the MySQL database software:

Step 1: Install the MySQL database software

sudo apt-get update
sudo apt-get install mysql-server

Step 2: Configure the MySQL database

sudo vi /etc/mysql/mysql.conf.d/mysqld.cnf

In configuration Find the following line in the file and uncomment it:

bind-address            = 127.0.0.1

Save the configuration file and restart the MySQL service:

sudo systemctl restart mysql.service

3. Set up database replication
   Next, we will Set up database replication to implement a high-availability database architecture. The following is sample code to set up MySQL database replication:

Step 1: Create a replication user
Create a user on the master database that can be replicated from the slave database:

CREATE USER 'replication'@'%' IDENTIFIED BY 'password';
GRANT REPLICATION SLAVE ON *.* TO 'replication'@'%';
FLUSH PRIVILEGES;

Steps 2: Back up the primary database
Perform the backup operation on the primary database:

FLUSH TABLES WITH READ LOCK;
SHOW MASTER STATUS;

Record the values ​​​​of File and Position, which will be used to set the secondary database Used when copying.

Step 3: Configure the slave database
Perform the following operations on the slave database:

CHANGE MASTER TO MASTER_HOST='主数据库的IP地址',
MASTER_USER='replication',
MASTER_PASSWORD='password',
MASTER_LOG_FILE='主数据库的File值',
MASTER_LOG_POS=主数据库的Position值;

Step 4: Start replication from the slave database
Start the replication operation on the slave database:

START SLAVE;

4. Monitoring and maintaining database replication
   After setting up database replication, we need to monitor and maintain the status of replication to ensure data consistency and availability.

Step 1: Monitor the replication status
Perform the following operations on the slave database to view the replication status:

SHOW SLAVE STATUSG;

Step 2: Handle replication errors
If the replication process If an error occurs, you can try the following operations to fix it:

• Check whether the network connection is normal and ensure that the master and slave databases can communicate with each other.
• Check whether the replication configuration is correct and reconfigure the replication parameters.

• If the replication process stops, you can use the following command to restart replication:

  STOP SLAVE;
  START SLAVE;

Conclusion:
High availability of the database is very important for Internet applications important. By setting up database replication, we can improve the system's availability and fault tolerance. This article describes how to set up highly available database replication on a Linux operating system and provides relevant code examples. I hope this article was helpful when setting up database replication.

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