Install MySQL using Yum for Linux

List of articles

• Linux And yum install MySQL
• • Mysql 5.7 The main characteristics of
  • yum Deployment way
  • • • 1、 To write yum Source configuration file
      • 2、 Generate yum Source cache
      • 3、 Check the installation yum Does the source exist
      • 4、 install MySQL service
      • 5、 start-up MySQL service
      • 6、 initialization
      • 7、 Default password and try to change it
      • 8、 Remote connection
    • Uninstall the installed MySQL

Linux And yum install MySQL

Deploy MySQL Databases can be deployed in many ways , There are three common deployment methods ：yum install 、rpm Install and compile and install . Each installation method has its own advantages , So what enterprises usually adopt is rpm And binary installation .

Download address of the official website of the database

Mysql 5.7 The main characteristics of

• Better performance ： For multi-core CPU、 Solid state disk 、 Locks have better optimization , Per second 100W QPS It is no longer MySQL The pursuit of , Will the next version be available 200W QPS That's what our users are more concerned about

• better InnoDB Storage engine

• More robust replication capabilities ： Replication brings a solution that does not lose data at all , Traditional financial customers can also choose to use MySQL database . Besides ,GTID Online smooth upgrades are also possible

• Better optimizer ： The significance of optimizer code refactoring will bring great improvements in this version and later versions ,Oracle The authorities are working on MySQL The biggest problem before

• Native JSON Type of support

• Better geographic information service support ：InnoDB Native supports geographic location types , Support GeoJSON,GeoHash characteristic

• newly added sys library

yum Deployment way

from CentOS 7.0 Since its publication ,yum Start using in the source Mariadb Instead of MySQL Installation ( What's here mariadb, and mysql What's the difference? , Interested partners can check it by themselves ）. Even if you type in yum install -y mysql , It also shows Mariadb Installation content of . If you want to install Mysql Must use Mysql Official yum Source .

1、 To write yum Source configuration file

# Good configuration yum Source , Include epel Source 
	1. curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
	2. wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
	3. yum -y install vim wget

• Official use yum Warehouse

  Download link on official website

wget https://dev.mysql.com/get/mysql80-community-release-el7-4.noarch.rpm( Copy the link )

yum install mysql80-community-release-el7-4.noarch.rpm

2、 Generate yum Source cache

Every time we write , All need to generate yum cache , To avoid installation errors .

 1. yum makecache

3、 Check the installation yum Does the source exist

	1. yum repolist enabled | grep mysql
	
 Select the version installed by default    The default is 8.0  edition 
 install  YUM  Management Kit , This package provides  yum-config-manager  Command tool 
	1. yum -y install yum-utils
	2. yum-config-manager --disable mysql80-community	
	3. yum-config-manager --enable mysql57-community
	4. yum repolist enabled | grep mysql

4、 install MySQL service

 yum install -y  mysql-community-server   Then wait for the installation 

5、 start-up MySQL service

 start-up mysqld  Server side 
1. systemctl start mysqld
 See if it starts 
2. systemctl status mysqld

6、 initialization

MySQL Server initialization （ from MySQL 5.7 Start ）

stay MySQL When the server starts initially , If the server's data directory is empty , Then the following will happen ：

• MySQL The server is initialized .

• Generate... In the data directory SSL Certificate and key files .

• Install and enable the validate_password plug-in unit .

• Will create a super user account ’root’@‘localhost’. And will set the password of the super user , Store it in the error log file /var/log/mysqld.log in .

  1. grep ‘temporary password’ /var/log/mysqld.log

7、 Default password and try to change it

mysql -uroot -p'goUaahghs8?r'

#  The reason for the following error is that the initialization password needs to be changed 
1. show databases;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

2. alter user   [email protected]   identified  by  '123456';
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

# Too simple a password will fail , Because it does not meet the requirements of password complexity 

#  Change Password 
1. alter user   [email protected]   identified  by  '[email protected]';
Query OK, 0 rows affected (0.00 sec)
#  Refresh the permissions 
2.  FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)

#  To set a simpler password, you need to cancel the password complexity , edit  /etc/my.cnf The configuration file ,  stay  [mysqld] Add the following content to the configuration block ( This configuration is not recommended for enterprise build environments )
plugin-load=validate_password.so 
validate-password=OFF

8、 Remote connection

Remote login also requires authorization for remote login
Mysql Remote login is not allowed by default , We need to set off selinux Or firewall , Open without closing the firewall 3306 port ;

#  Allow local users to link 
1. grant all privileges on *.* to [email protected] identified by ' password ';
 Query OK, 0 rows affected, 1 warning (0.00 sec)

#  Allow any IP Connect 
2. grant all privileges on *.* to [email protected]'%' identified by ' password ';
 Query OK, 0 rows affected, 1 warning (0.00 sec)

Add open 3306 Port of iptables The rules

iptables -t filter -I INPUT -p tcp --dport 3306 -j ACCEPT

Uninstall the installed MySQL

//rpm Package installation mode uninstall 
 Check the package name ：rpm -qa|grep -i mysql
 The delete command ：rpm -e –nodeps  Package name 
 
//yum Installation method download 
1. View installed mysql
 command ：rpm -qa | grep -i mysql
2. uninstall mysql
 command ：yum remove mysql-community-server-5.6.36-2.el7.x86_64
 see mysql Other dependencies ：rpm -qa | grep -i mysql
 
// Unload dependencies 
yum remove mysql-libs
yum remove mysql-server
yum remove perl-DBD-MySQL
yum remove mysql

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