MySQL 8.4 Community Version And Replication Process Setup Using Caching_sha2_password And Secure Connection

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Introduction

MySQL 8.4 is a popular open-source relational database management system that offers a wide range of features and tools for managing and analyzing data. One of the key features of MySQL is its replication capabilities, which allow you to create a copy of your database on another server, ensuring high availability and data redundancy. In this article, we will discuss how to set up a replication process between two MySQL Server 8.4.1 servers using a replication user with 'caching_sha2_password' and a secure connection.

Prerequisites

Before setting up the replication process, you need to ensure that both servers meet the following prerequisites:

  • MySQL Server 8.4.1 or later
  • Caching_sha2_password plugin enabled on both servers
  • Secure connection (SSL/TLS) enabled on both servers
  • Replication user created with the necessary privileges

Enable Caching_sha2_password Plugin

To enable the caching_sha2_password plugin on both servers, you need to follow these steps:

  1. Connect to the MySQL server using the root user or any other user with sufficient privileges.

  2. Run the following command to enable the caching_sha2_password plugin:

mysql> SET GLOBAL default_authentication_plugin = 'caching_sha2_password';


3.  Restart the MySQL server to apply the changes.

Enable Secure Connection (SSL/TLS)


To enable a secure connection (SSL/TLS) on both servers, you need to follow these steps:


    

  1. 

    Generate a certificate and private key pair using a tool like OpenSSL:
    

    

    2. 



openssl req -x509 -newkey rsa:2048 -nodes -keyout server.key -out server.crt -days 365 -subj "/C=US/ST=State/L=Locality/O=Organization/CN=server"

  1. Copy the generated certificate and private key to the MySQL server's data directory.

  2. Configure the MySQL server to use the SSL/TLS certificate and private key:

mysql> SET GLOBAL ssl_ca = '/path/to/ca.crt'; mysql> SET GLOBAL ssl_cert = '/path/to/server.crt'; mysql> SET GLOBAL ssl_key = '/path/to/server.key';


4.  Restart the MySQL server to apply the changes.

Create Replication User




To create a replication user with the necessary privileges, you need to follow these steps:


    

  1. 

    Connect to the MySQL server using the root user or any other user with sufficient privileges.
    

    2. 

  2. 

    Create a new user with the necessary privileges:
    

    

    3. 



mysql> CREATE USER 'replication_user'@'%' IDENTIFIED WITH caching_sha2_password BY 'password';
mysql> GRANT REPLICATION SLAVE ON . TO 'replication_user'@'%';

Configure Replication

To configure replication between the two servers, you need to follow these steps:

  1. Connect to the master server using the replication user.

  2. Run the following command to create a new replication channel:

mysql> CHANGE MASTER TO MASTER_HOST='slave_server', MASTER_PORT=3306, MASTER_USER='replication_user', MASTER_PASSWORD='password'; ``3. Start the replication process:

```sql

mysql> START SLAVE;


## Troubleshooting
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If you encounter any issues during the replication process, you can use the following commands to troubleshoot:


    

  • 

    Check the replication status:
    

    

    • 



mysql> SHOW SLAVE STATUS\G;

  • Check the error log:

mysql> SHOW ERRORS;


*   Restart the replication process:

```sql



mysql> STOP SLAVE;
mysql> START SLAVE;

Conclusion

In this article, we discussed how to set up a replication process between two MySQL Server 8.4.1 servers using a replication user with 'caching_sha2_password' and a secure connection. We covered the prerequisites, enabled the caching_sha2_password plugin and secure connection, created a replication user, configured replication, and provided troubleshooting tips. By following these steps, you can ensure a high-availability and data-redundancy setup for your MySQL database.

Additional Resources

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Introduction

In our previous article, we discussed how to set up a replication process between two MySQL Server 8.4.1 servers using a replication user with 'caching_sha2_password' and a secure connection. However, we understand that you may have some questions regarding the setup process. In this article, we will address some of the frequently asked questions (FAQs) related to MySQL replication and provide additional information to help you troubleshoot any issues you may encounter.

Q&A

Q: What is the difference between caching_sha2_password and sha256_password?

A: The caching_sha2_password plugin is a new authentication plugin introduced in MySQL 8.0 that provides improved password hashing and caching capabilities. The sha256_password plugin, on the other hand, is an older plugin that uses the SHA-256 algorithm for password hashing. While both plugins provide secure password authentication, caching_sha2_password is recommended for new installations due to its improved performance and security features.

Q: How do I enable the caching_sha2_password plugin on a MySQL server that is already running?

A: To enable the caching_sha2_password plugin on a running MySQL server, you need to follow these steps:

  1. Connect to the MySQL server using the root user or any other user with sufficient privileges.

  2. Run the following command to enable the caching_sha2_password plugin:

mysql> SET GLOBAL default_authentication_plugin = 'caching_sha2_password';


3.  Restart the MySQL server to apply the changes.

Q: What is the difference between a master and a slave in MySQL replication?


A: In MySQL replication, the master server is the primary server that contains the original data, while the slave server is a copy of the master server that replicates the data from the master. The master server is responsible for accepting write operations and replicating the data to the slave server, while the slave server is responsible for applying the replicated data to its own database.


Q: How do I configure replication between two MySQL servers that are running on different operating systems?


A: To configure replication between two MySQL servers running on different operating systems, you need to ensure that both servers meet the following prerequisites:


    

  • MySQL Server 8.4.1 or later
    • 

  • Caching_sha2_password plugin enabled on both servers
    • 

  • Secure connection (SSL/TLS) enabled on both servers
    • 

  • Replication user created with the necessary privileges
    • 



You can then follow the same steps outlined in our previous article to configure replication between the two servers.


Q: What are some common issues that can occur during MySQL replication?


A: Some common issues that can occur during MySQL replication include:


    

  • Replication lag: This occurs when the slave server falls behind the master server due to high write activity or network latency.
    • 

  • Replication errors: These can occur due to issues with the replication user, password, or SSL/TLS certificate.
    • 

  • Data inconsistencies: These can occur due to issues with the replication process or data corruption on the master or slave server.
    • 



You can troubleshoot these issues by checking the replication status, error log, and data consistency using following commands:


    

  • 

    Check the replication status:
    

    

    • 



mysql> SHOW SLAVE STATUS\G;

  • Check the error log:

mysql> SHOW ERRORS;


*   Check data consistency:

```sql



mysql> CHECK TABLE table_name;

Q: How do I troubleshoot replication issues using the MySQL error log?

A: To troubleshoot replication issues using the MySQL error log, you need to follow these steps:

  1. Connect to the MySQL server using the root user or any other user with sufficient privileges.

  2. Run the following command to view the error log:

mysql> SHOW ERRORS;


3.  Check the error log for any replication-related errors or warnings.
4.  Use the information in the error log to troubleshoot the issue and apply any necessary fixes.

Conclusion




In this article, we addressed some of the frequently asked questions (FAQs) related to MySQL replication and provided additional information to help you troubleshoot any issues you may encounter. By following the steps outlined in our previous article and using the troubleshooting tips provided in this article, you can ensure a high-availability and data-redundancy setup for your MySQL database.


Additional Resources