Build mysql server on linux system

1. Download the mysql installation package from the official website

The following picture is an introduction to the mysql installation package

2 , Install software package

1, Install dependencies

# yum -y install perl-Date-Dumper perl-JSON perl-Time-HiRes

2, Unzip the mysql installation package

# tar -xvf mysql-5.7.24.tar               //解压mysql包

3, Uninstall the old version of the package

[root@localhost ~]# rm -rf /etc/my.cnf

4, Delete data

[root@localhost ~]# rm -rf /var/lib/mysql/*

5. Uninstall the software package (no software package will be displayed as uninstalled)

[root@localhost ~]# rpm -e --nodeps mariadb-server mariadb

Warning: /var/log/mariadb/mariadb.log has been saved as /var /log/mariadb/mariadb.log.rpmsave

#yum -y remove mariadb-libs.x86_64 1:5.5.52-1.el7

6. Install yum source

#yum -y install mysql-community-client mysql-community-common mysql-community-devel mysql-community-embedded mysql-community-embedded-compat mysql-community-embedded-devel  mysql-community-libs mysql-community-libs-compat mysql-community-minimal-debuginfo mysql-community-server mysql-community-test

or

#yum -y install mysql-community-*.rpm

7. Check the installed mysql related installation package

# rpm -qa | grep -y mysql

8. Start the service

# systemctl start mysqld
# systemctl enable mysqld //设置开机自启
# systemctl status mysqld
[root@proxy mysql]# ss -antulp | grep mysqld //查看服务启动端口
# ps aux | grep mysqld //查进程

3. Connect to the database

1. Check the randomly generated root password

# grep password /var/log/mysqld.log
#  grep 'temporary password' /var/log/mysqld.log //随机生成的管理密码

Initial password login mysql:

(!!!You must change the password management immediately when logging in with a randomly generated password, otherwise an error will be reported)

2. Client command mysql to connect to the database

# mysql -hlocalhost -uroot -p'pIhMu,i2OS#,' //用初始密码登录
mysql> \h //登录成功后，查可用的快捷键

4. Change the password

1. You can only modify the password first

mysql> alter user root@"localhost" identified by "123qqq...A";

2. You can modify the password limit length

mysql> show variables like "%password%";              //查询密码有关的变量
mysql> set global validate_password_policy=0;       //只验证长度
mysql> set global validate_password_length=6;      //修改密码长度为6位
mysql> alter user root@"localhost" identified by "123456";             //修改root密码为123456

Recommended tutorial: mysql tutorial

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