Play with Linux and easily install and configure MySQL

This article mainly explains in Linux Installation on 、 Configure and use MySQL, Used in this article Linux System is CentOS7.6 edition

lately Yige Purchased a virtual host , however Yige Very poor , So I only bought a simple virtual host , Except for one CentOS Beyond the system , There is really nothing left . but Yige It has to be used MySQL, So it can only be in this CentOS Install manually in MySQL 了 , therefore Yige Just install yourself MySQL The process is recorded , For your reference .

One 、 be based on Linux Systematic MySQL install

This article mainly explains manual installation MySQL, There is no use of foolishness Docker, That's too simple ......

1.1 Use wget Instruction Download MySQL Of rpm package

install MySQL Before , Be sure to have MySQL Installation package , here Yige Use wget To download .

stay Linux The system creates and enters the specified directory , The following is a /usr/local Catalog , Use pwd Command to view the path of the current directory , And then through wget Instruction now mysql Of rpm package , Download here mysql Version is 5.7.

[[email protected] local]# pwd/usr/local[[email protected] local]# wget http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm

1.2 adopt rpm install MySQL

MySQL After downloading , utilize rpm Installation .

adopt rpm Instructions to install downloaded rpm package

[[email protected] local]# rpm -ivh mysql57-community-release-el7-10.noarch.rpm

1.3 adopt yum install mysql service

Next we have to open mysql service .

MySQL It runs in the system as a service , install rpm The package is then passed yum Command installation MySQL service

[[email protected] local]# yum -y install mysql-community-server

install mysql In the process of service , You may encounter the following errors ：

If the above installation error occurs , Indicates... During installation GPG Verification failed , We can do it in yum Add after the command

--nogpgcheck Options Re perform the installation ：

[[email protected] local]# yum -y install mysql-community-server --nogpgcheck

Two 、MySQL Service management

MySQL After the software is installed , We need to be right about MySQL Make the necessary configuration , Here's the configuration mysql Common commands for service .

2.1 take MySQL The service is added and started

add to mysql After startup ,MySQL The service will start with the system startup .

[[email protected] local]# systemctl enable mysqld

2.2 start-up MySQL service

stay CentOS7 Can be used in systemctl Service management , If you use it Linux The system version does not support systemctl, You can also use service mysqld start To start up MySQL service .

[[email protected] local]# systemctl start mysqld                [[email protected] local]# lsof -i:3306COMMAND  PID  USER   FD   TYPE DEVICE SIZE/OFF NODE NAMEmysqld  8430 mysql   17u  IPv6  70095      0t0  TCP *:mysql (LISTEN)

2.3 stop it MySQL service

[[email protected] local]# systemctl stop mysqld

Or use ：

[[email protected] local]# service mysqld stop

3、 ... and 、MySQL Basic use

Next we can use MySQL 了 .

3.1 lookup MySQL Initial password

MySQL After the service starts , We can go through mysql Command start MySQL Client connection MySQL database , Connection needs root Account password , In the installation MySQL Is generated by default root The initial password of the account is recorded in /var/log/mysqld.log In file , adopt cat The command can query the first-time password , The execution instructions are as follows ：

[[email protected] local]# cat /var/log/mysqld.log | grep password

As shown in the following figure, the initial password is displayed in the empty color box of the execution result

3.2 Log in with the initial password MySQL

perform mysql Instructions ,-u After the option root Represents the user name ,-p Enter without adding parameters after the option , Then enter the initial password （ There is no feedback in the input box when entering the password , Enter directly after the input ）, appear mysql> Execution tips , Indicates successful login .

3.3 modify MySQL Initial password

The initial password is only used for login , After logging in, you must change the initial password to perform database operations ; because MySQL With password security verification , Therefore, you can set the password verification policy to LOW, Then set the password , as follows ：

In particular ： The password is set in mysql Client input sql command

#  Set the password checking mechanism to LOWmysql> set global validate_password_policy=LOW;#  Change Password mysql> set password=password('admin123');

3.4 to grant authorization root Users are allowed to log in remotely

After the password is changed , perform exit Instructions , sign out mysql client , Then login again with the modified password

After login ,root The user does not support remote connection by default , If you want to use a remote client （Navicat、SQLYog etc. ）root Account connection MySQL Database authorization , Can be specified during authorization root Password for remote connection of account （ The following command password is admin123）

mysql> GRANT ALL PRIVILEGES on *.* to 'root'@'%' IDENTIFIED by 'admin123' WITH GRANT OPTION;mysql> flush PRIVILEGES;

After the above two instructions are completed , You can try it navicat Connect MySQL Database ！

PS: If the ECS is used Linux System , Also note the security group configuration release 3306 Port yo ~

Now you know how to CentOS Install, configure, and use MySQL Did you? ？ If there is any doubt , You can leave a message to Yige in the comment area , Let me solve it for you .