CentOS install mysql8

1. Download and install yum repostory

download ：

wget -i -c  https://repo.mysql.com//mysql80-community-release-el7-1.noarch.rpm

install myql：

yum -y install mysql80-community-release-el7-1.noarch.rpm

install mysql service ：

yum -y install mysql-community-server

2. Configuration database ：

2.1 If necessary, you can set u Case insensitive （ edit /etc/my.cnf file ）：

Add the following configuration to the file ：

lower_case_table_names=1   // 1： Insensitivity ,0： sensitive )

2.2 start-up mysql8

systemctl start  mysqld.service

2.3 see mysql8 Running state

systemctl status mysqld.service

2.4 Set the password

We need to know the password first root Use the following command to view the initial password of the account ：

grep "password" /var/log/mysqld.log

The arrow in the above figure indicates the initial password , Copy the password , Use the following command to log in to the database ：

mysql -uroot -p

Be careful ： At this time, you can't do anything by logging in with your initial password , You need to change the initial password first , Modify the initial password. If the password is too simple, it will report an error , If you want to set a simple password , Then for the first time, you'd better set a more complicated , Modify the password policy after setting , At this time, you can change it to a simple password again , The specific operation is as follows ：

2.4.1 Change a complex password ：

ALTER USER 'root'@'localhost' IDENTIFIED BY ' Your complex password ';

2.4.2 Check password policy ：

SHOW VARIABLES LIKE 'validate_password%';

Note that there mysql8 The password policy for is

validate_password.policy

and mysql5 The password policy is

validate_password_policy

2.4.3 Modify the policy to low level ：

set global validate_password.policy=LOW;

And then follow 2.4.1 Command to change a simple password

3. Set up remote access ：

3.1 Open the firewall 3306 port

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

If the firewall is off , You can open it first

1> View firewall status ：systemctl status firewalld

2> Turn on the firewall ：systemctl start firewalld

After opening the firewall, execute the open port command .

3.2 Refresh firewall

firewall-cmd --reload

End of installation .

** Last ：** If you use navicat The client login may report an error , Because the password authentication method does not support , The default is caching_sha2_password, You can modify /etc/my.cnf The password authentication method of the file is changed to mysql_native_password

stay my.cnf Of documents [mysqld] Add the following configuration ：

default_authentication_plugin=mysql_native_password

Sign in mysql

mysql -u root -p

Query user information ：

select host, user, authentication_string, plugin from user;

We can see relevant information in the above figure , Default localhost, Does not support all ip visit , We modify all ip All allowed , Then put localhost Change it to %

update user set host='%' where user = 'root';

Modify encryption rules ：

ALTER USER 'root'@'%' IDENTIFIED BY ' The login password ' PASSWORD EXPIRE NEVER;

Update the password ：

ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY ' The login password ';

Refresh the permissions ：

flush privileges;

Here we are ok！