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Install MySQL Server on Ubuntu
MySQL is an open-source relational database that is free and widely used. It is a good choice if you know that you need a database but don’t know much about all the available options.
This article describes a basic installation of a MySQL database server on Ubuntu Linux. You might need to install other packages to let applications use MySQL, like extensions for PHP. Check your application documentation for details
Install MySQL
Install the MySQL server by using the Ubuntu package manager:
sudo apt-get update
sudo apt-get install mysql-server
Allow remote access
If you have iptables enabled and want to connect to the MySQL database from another machine, you must open a port in your server’s firewall (the default port is 3306). You don’t need to do this if the application that uses MySQL is running on the same server.
Run the following command to allow remote access to the mysql server:
sudo ufw allow mysql
Start the MySQL service
After the installation is complete, you can start the database service by running the following command. If the service is already started, a message informs you that the service is already running:
systemctl start mysql
Launch at reboot
To ensure that the database server launches after a reboot, run the following command:
systemctl enable mysql
Start the mysql shell
There is more than one way to work with a MySQL server, but this article focuses on the most basic and compatible approach, the mysql shell.
- At the command prompt, run the following command to launch the the mysql shell and enter it as the root user:
/usr/bin/mysql -u root -p
2.When you’re prompted for a password, enter the one that you set at installation time, or if you haven’t set one, press Enter to submit no password.
The following mysql shell prompt should appear:
mysql>
Set the root password
If you logged in by entering a blank password, or if you want to change the root password that you set, you can create or change the password.
- Enter the following command in the mysql shell, replace password with your new password:
UPDATE mysql.user SET Password = PASSWORD('password') WHERE User = 'root';
- To make the change take effect, reload the stored user information with the following command:
FLUSH PRIVILEGES;
Note: We’re using all-caps for SQL commands. If you type those commands in lowercase, they’ll work. By convention, the commands are written in all-caps to make them stand out from field names and other data that’s being manipulated.
命令关键字大小写都能识别
View users
MySQL stores the user information in its own database. The name of the database is mysql. Inside that database the user information is in a table, a dataset, named user. If you want to see what users are set up in the MySQL user table, run the following command:
The following list describes the parts of that command:
- SELECT tells MySQL that you are asking for data.
- User, Host, authentication_string tells MySQL what fields you want it to look in. Fields are categories for the data in a table. In this case you are looking for the username, the host associated with the username, and the encrypted password entry.
- FROM mysql.user “ tells MySQL to get the data from the mysql database and the user table.
- A semicolon (
标签： 来源： https://blog.csdn.net/vivian_wanjin/article/details/82777797
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