rpm -qa | grep mysql#可能的顯示情況如下#mysql-community-libs-8.0.12-1.el7.x86_64#mysql80-community-release-el7-1.noarch#mysql-community-client-8.0.12-1.el7.x86_64#mysql-community-common-8.0.12-1.el7.x86_64#mysql-community-server-8.0.12-1.el7.x86_64#通過下面的命令進行刪除yum remove mysql-xxx-xxx-#查找mysql的相關文件find / -name mysql#根據自身的需求刪除mysql的配置文件信息rm -rf /var/lib/mysql

rpm -qa | grep mariadb#查找mariadb#可能出現的結果mariadb-libs-5.5.56-2.el7.x86_64#將查找出來的結果進行強制刪除rpm -e --nodeps mariadb-libs-5.5.56-2.el7.x86_64

cd /usr/srcwget https://dev.mysql.com/get/mysql80-community-release-el7-1.noarch.rpm#安裝yum源yum localinstall mysql80-community-release-el7-1.noarch.rpm#更新yum源yum clean allyum makecache#開始安裝MySQLyum install mysql-community-server#啟動MySQLsystemctl start mysqld#啟動成功后可以查看初始化密碼隨機生成的cat /var/log/mysqld.log | grep password#登錄MySQL修改mysql用戶密碼mysql -u root -pmysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'yourpassword';#遠程設置mysql> use mysql;mysql> update user set host='%' where user='root';#授權用戶名的權限，賦予任何主機訪問數據的權限mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%'WITH GRANT OPTION;mysql> FLUSH PRIVILEGES;

#允許myuser用戶使用mypassword密碼從任何主機連接到mysql服務器GRANT ALL PRIVILEGES ON *.* TO 'myuser'@'%'IDENTIFIED BY 'mypassword' WITH GRANT OPTION;#允許用戶myuser從ip為192.168.1.6的主機連接到mysql服務器，并使用mypassword作為密碼GRANT ALL PRIVILEGES ON *.* TO 'myuser'@'192.168.1.3'IDENTIFIED BY 'mypassword' WITH GRANT OPTION;

#啟動mysqlsystemctl start mysqld.service#結束systemctl stop mysqld.service#重啟systemctl restart mysqld.service#開機自啟systemctl enable mysqld.service

#修改加密規則 （這行我沒有寫，不過貌似也可以）密碼需要設置包含大小寫字母符號和數字的格式，否則設置不會超成功ALTER USER 'root'@'%' IDENTIFIED BY 'password' PASSWORD EXPIRE NEVER; #更新一下用戶的密碼 ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY 'password'; #刷新權限FLUSH PRIVILEGES;