How to install mysql5.7 on Linux

MySQL is the most popular relational database management system. In terms of WEB applications, MySQL is the best RDBMS (Relational Database Management System: relational database) Management system) one of the application software.

Specific steps to install mysql5.7 on Linux

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

Unzip

 tar -xvf mysql-5.7.26-linux-glibc2.12-x86_64.tar

##Move and rename again

 mv mysql-5.7.26-linux-glibc2.12-x86_64 /usr/local/mysql

Create mysql user groups and users and modify permissions

 groupadd mysql
 
 useradd -r -g mysql mysql

Create the data directory and grant permissions

 mkdir -p  /data/mysql              #创建目录
 
 chown mysql:mysql -R /data/mysql   #赋予权限

Configure my.cnf

 vim /etc/my.cnf

The content is as follows

 [mysqld]
 
 bind-address=0.0.0.0
 
 port=3306
 
 user=mysql
 
 basedir=/usr/local/mysql
 
 datadir=/data/mysql
 
 socket=/tmp/mysql.sock
 
 log-error=/data/mysql/mysql.err
 
 pid-file=/data/mysql/mysql.pid
 
 #character config
 
 character_set_server=utf8mb4
 
 symbolic-links=0
 
 explicit_defaults_for_timestamp=true

Initialize the database

Enter the bin directory of mysql

 cd /usr/local/mysql/bin/

Initialize

 ./mysqld --defaults-file=/etc/my.cnf --basedir=/usr/local/mysql/ --datadir=/data/mysql/ --user=mysql --initialize

View Password

 cat /data/mysql/mysql.err

Start mysql and change the root password

First place mysql.server in /etc/init.d/

 cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysql

in mysql starts! ! !

 service mysql start
 
 
 
 ps -ef|grep mysql

This means that mysql has been installed successfully! !

Change the password below

First log in to mysql, the previous one is randomly generated.

 ./mysql -u root -p   #bin目录下

Perform the following three steps and then log in again.

 SET PASSWORD = PASSWORD('123456');
 
 ALTER USER 'root'@'localhost' PASSWORD EXPIRE NEVER;
 
 FLUSH PRIVILEGES;

If you use remote connection at this time... you will find that you cannot connect.

The following three commands are mainly executed here (log in to the database first)

 use mysql                                            #访问mysql库
 
 update user set host = '%' where user = 'root';      #使root能再任何host访问
 
 FLUSH PRIVILEGES;                                    #刷新

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