Install mysql5.7 in Linux. Follow Han Shunping

1. Preparation before installation

If we need to develop JavaEE under Linux, we need to install the following software
Data download address: Baidu network disk
cloud disk
Extraction code: zruq

Here we can download the following 2

2. Installation

1. Create a new folder /opt/mysqland cd into it

mkdir /opt/mysql
cd /opt/mysql

2. Run wget http://dev.mysql.com/get/mysq1-5.7.26-1.el7.x86_ _64.rpm-bundle.tar to download the mysql installation package

PS: The mysql-like database that comes with centos7.6 is mariadb, which will conflict with mysql and must be deleted first.

Here we upload the mysql package in the data into /opt/mysqlthe directory through Xftp

to check whether the upload is successful

ll

3. Run decompression

tar -xvf mysql-5.7.26- 1.e17.x86_ _64.rpm-bundle.tar 

4. Run rpm -qalgrep mari to query mariadb related installation packages

rpm -qa|grep mari

Found that there is indeed mariadb

5. Run rpm -e --nodeps mariadb-libs, uninstall

rpm -e --nodeps mariadb-libs
rpm -e --nodeps marisa

It is found that the deletion is successful

6. Then start to actually install mysql, and run the following in turn

rpm -ivh mysql-community-common-5.7.26-1.el7.x86_64.rpm
rpm -ivh mysql-community-libs-5.7.26-1.el7.x86_64.rpm
rpm -ivh mysql-community-client-5.7.26-1.el7.x86_64.rpm
rpm -ivh mysql-community-server-5.7.26-1.el7.x86_64.rpm

7. Run systemctl start mysqld.service to start mysql

systemctl start mysqld.service

8. Then start to set the root user password
Mysql automatically sets a random password for the root user, run grep "password" /var/log/mysqld.log to see the current password

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

The temporary password is as follows:

9. Run mysql -u root -p, log in with the root user, prompt to enter the password can be used above, you can successfully log in to the mysql command line

mysql -u root -p

login successful

10. Set the root password. For the personal development environment, if you want to set a relatively simple password (the production environment server needs to set a complex password), you can run

set global validate_password_policy=0; 

Prompt password setting policy
(validate_ password_ policy default value 1,)

11.set password for ‘root@’ localhost’ =password(hspedu100’);

set password for 'root'@'localhost'=password('hspedu100');

12. Run flush privileges; make the password settings take effect

flush privileges;

If the password set here is less than 8 characters, you can change the password policy

# 查看 mysql 初始的密码策略。
SHOW VARIABLES LIKE 'validate_password%'; 
# 设置密码的验证强度等级，设置 validate_password_policy 的全局参数为 LOW 
set global validate_password_policy=LOW;
# 设置 validate_password_length 的全局参数为 6 
set global validate_password_length=6;
# 如果是小于4位的密码可以把数字设置为0
set global validate_password_number_count=0;

Note: The production library password must be complex