Centos7 installs Msyql5.7.34

1. Download the Mysql installation package

Official download address:
https://dev.mysql.com/downloads/mysql/5.7.html#downloads

2. Decompress Mysql

• Create a new installation directory in the server's /usr/local directory, usually named after msyql+version number.

cd/usr/local/
mkdir mysql5.7.34

• Place the downloaded installation package in this directory
  

• Unzip the downloaded compressed package

tar -xzvf mysql-5.7.34-linux-glibc2.12-x86_64.tar.gz

• Modify the unzipped folder name

mv mysql-5.7.34-linux-glibc2.12-x86_64 mysql

3. Create users and groups

#建立一个mysql的组 
groupadd mysql 

#建立mysql用户，并且把用户放到mysql组 
useradd -r -g mysql mysql 

#还可以给mysql用户设置一个密码 
passwd mysql   回车设置mysql用户的密码 

#修改/usr/local/mysql 所属的组和用户
chown -R mysql:mysql /usr/local/mysql/

4. Modify the configuration file

• Create mysql configuration file
  Create my_default.cnf in the /usr/local/mysql5.7.34/mysql/support-files directory, and then edit
  vi my_default.cnf

[mysqld]
basedir = /usr/local/mysql5.7.34/mysql
datadir = /usr/local/mysql5.7.34/mysql/data
port = 3306
socket = /usr/local/mysql5.7.34/mysql/tmp/mysql.sock
character-set-server=utf8

[client]
default-character-set=utf8
socket = /usr/local/mysql5.7.34/mysql/tmp/mysql.sock

[mysql]
default-character-set=utf8
socket = /usr/local/mysql5.7.34/mysql/tmp/mysql.sock

• Esc key, enter: wq to save
• cp my_default.cnf /etc/my.cnf
• To achieve the automatic execution effect of mysqld -install at boot
  - copy mysql.server to the /etc/init.d/ directory

cp mysql.server /etc/init.d/mysql    

• Modify /etc/init.d/mysql parameters

vi /etc/init.d/mysql 

• Esc key to exit editing mode, enter: wq to save and exit

• Create a directory to store socket files (the path is the path to the socket configuration in the my.cnf configuration file)

#进入/usr/local/mysql5.7.34/mysql目录创建
mkdir tmp

#修改组和用户为mysql 
chown mysql:mysql tmp

• Add service mysql

chkconfig --add mysql 

• Set mysql service to automatic

chkconfig mysql on 

5. Initialize the mysql service

#进入目录
cd /usr/local/mysql5.7.34/mysql/bin

• initialization

mysqld --initialize --user=mysql --basedir=/usr/local/mysql5.7.34/mysql --datadir=/usr/local/mysql5.7.34/mysql/data 

Remember this password, this is the initial password for installing mysql

6. Start mysql

/usr/local/mysql5.7.34/mysql/bin/mysqld_safe --user=mysql & 

# 过段时间，当不再刷屏时，按Ctrl + C退出后台进程，然后执行

/etc/init.d/mysql restart 

• View progress

ps -ef|grep mysql

7. Log in to the mysql database for the first time

• Login

/usr/local/mysql5.7.34/mysql/bin/mysql -uroot -p 

• Enter the temporary password obtained during initialization (to prevent incorrect input, it is best to copy the temporary password obtained through previous initialization)
  - If this occurs
  
• implement

#/usr/local/mysql5.7.34/mysql/bin为安装位置

ln -s /usr/local/mysql5.7.34/mysql/bin/mysql /usr/bin

• change Password

set password=password('root用户的密码');

• Exit mysql

mysql> exit;

8. Set up remote access

• Open port 3306 of the firewall (if the firewall is closed, skip this step)

firewall-cmd --permanent --zone=public --add-port=3306/tcp 
firewall-cmd --permanent --zone=public --add-port=3306/udp

• Effective immediately

firewall-cmd --reload 

• Add a remote access user in mysql
  • Use mysql library

mysql> use mysql; 

• View the host and user information of the user table

mysql>select host,user from user; 

• Set the remote account name and password (mysql 8.0 will report an error, please use orange words to set up remote access)

mysql> grant all privileges on *.* to 'root'@'%' identified by '远程访问mysql的密码' with grant option; 

• There is a pit in mysql 8.0 version, we can query the mysql.user table

 mysql> select host,user,plugin,authentication_string from user;

• You will find that the encryption method of the root user is "caching_sha2_password". Remote tools generally do not support this encryption method.

• Therefore, you need to first modify the encryption method of the root user to "mysql_native_password" and use the following command to modify it

mysql> alter user 'root'@'localhost' identified with mysql_native_password by 'root用户的密码';

• Refresh configuration

mysql> flush privileges;

• Then you can use connection software such as navicat to try out the connection happily! !