![]() ![]() Note: these are the local IP addresses our servers will be using for the purposes of this guide.īefore starting, we need to make sure that Selinux is disabled on each of our servers. 2 servers ( Cloud Server or Dedicated Server), both running a fresh installation of CentOS 7.Getting Startedīefore you begin, make sure you have the following: We’ll also be using MariaDB, a popular drop-in replacement for MySQL. The following guide will walk you through a basic MySQL replication setup using just two servers, one master and one slave. MySQL replication is a technique by which a master database will be automatically copied to one or more slave databases, making data backup, recovery, and analysis a much easier prospect. MySQL Tuner is an excellent starting point to optimize a MySQL server but it would be prudent to perform additional research for configurations tailored to the application(s) utilizing MySQL on your Linode.How to setup a MySQL Master-Slave Replication on CentOS 7 The output will show two areas of interest: General recommendations and Variables to adjust. You will be asked for the MySQL root user’s name and password. The longer the instance has been running, the better advice MySQL Tuner will give.ĭownload MySQL Tuner to your home directory. Ideally, the MySQL instance should have been operating for at least 24 hours before running the tuner. MySQL Tuner is a Perl script that connects to a running instance of MySQL and provides configuration recommendations based on workload. Update user SET PASSWORD=PASSWORD("password") WHERE USER='root' Use the following commands to reset root’s password. Reconnect to the MySQL server with the MySQL root account. Stop the current MySQL server instance, then restart it with an option to not ask for a password. If you forget your root MySQL password, it can be reset. use testdb Ĭreate table customers (customer_id INT NOT NULL AUTO_INCREMENT PRIMARY KEY, first_name TEXT, last_name TEXT) This creates a table with a customer ID field of the type INT for integer (auto-incremented for new records, used as the primary key), as well as two fields for storing the customer’s name. mysql -u testuser -pĬreate a sample table called customers. You can shorten this process by creating the user while assigning database permissions: create database testdb Grant all on testdb.* to 'testuser' identified by 'password' In the example below, testdb is the name of the database, testuser is the user, and password is the user’s password. Nowarning (\w) Don't show warnings after every statement.įor server side help, type 'help contents' Warnings (\W) Show warnings after every statement. Might be needed for processing binlog with multi-byte charsets. Takes database name as argument.Ĭharset (\C) Switch to another charset. System (\!) Execute a system shell command. Status (\s) Get status information from the server. Nopager (\n) Disable pager, print to stdout. NOTE: Takes the rest of the line as new delimiter.Įgo (\G) Send command to mysql server, display result vertically. Optional arguments are db and host.ĭelimiter (\d) Set statement delimiter. Note that all text commands must be first on line and end with ' 'Ĭonnect (\r) Reconnect to the server. ![]() You’ll then see: List of all MySQL commands: To generate a list of commands for the MySQL prompt, enter \h. You’ll then be presented with a welcome header and the MySQL prompt as shown below: mysql> When prompted, enter the root password you assigned when the mysql_secure_installation script was run. To log in to MySQL as the root user: mysql -u root -p The MySQL client is used through a terminal. The standard tool for interacting with MySQL is the mysql client which installs with the mysql-server package. sudo grep 'temporary password' /var/log/mysqld.log ![]() This password is notated in the /var/log/mysql.log file, and can be quickly found using the following command. If MySQL 5.7 was installed, you will need the temporary password that was created during installation. Please reference our MySQL remote access guide for information on connecting to your databases using SSH. MySQL will bind to localhost (127.0.0.1) by default. During installation, you will be asked if you want to accept the results from the. Install MySQL as usual and start the service. MySQL must be installed from the community repository.ĭownload and add the repository, then update. It can be installed as follows: yum install wget You will need wget to complete this guide. The first command should show your short hostname, and the second should show your fully qualified domain name (FQDN). Before You BeginĮnsure that you have followed the Getting Started and Securing Your Server guides, and the Linode’s hostname is set. If you’re not familiar with the sudo command, you can check our Users and Groups guide. Commands that require elevated privileges are prefixed with sudo. This guide is written for a non-root user. ![]()
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