linux快速安装mysql

1. 安装之前检测系统是否有自带的MySQL

   #检查是否安装过MySQL
   rpm -qa | grep mysql 
   #检查是否存在 mariadb 数据库（内置的MySQL数据库），有则强制删除
   rpm -qa | grep mariadb 
   #强制删除
   rpm -e --nodeps mariadb-libs-5.5.68-1.el7.x86_64
   #强制删除
   rpm -e --nodeps mariadb-5.5.68-1.el7.x86_64 
   

2. 导入密钥

   rpm --import https://repo.mysql.com/RPM-GPG-KEY-mysql-2022
   

3. 配置MySQL的yum仓库

   rpm -Uvh http://repo.mysql.com//mysql57-community-release-el7-7.noarch.rpm
   

4. 使用yum安装mysql

   yum -y install mysql-community-server
   

5. 启动mysql

   systemctl start mysqld
   

6. 查看MySQL状态

   systemctl status mysqld
   

7. 设置为开机自启

   systemctl enable mysqld
   

8. 获取MySQL初始密码

   cat /var/log/mysqld.log |grep "temporary password"
   

9. 登录mysql数据库

   mysql -u root -p 
   

10. 修改root用户命令(密码有要求 不低于8位,有大小写,有特殊字符)

    alter user 'root'@'localhost' identified by 'rootRoot123.';
    

11. 设置简单密码(把校验策略改成低/把密码校验长度改低一点

    set global validate_password_policy=LOW;
    set global validate_password_length=4;
    alter user 'root'@'localhost' identified by '123456';
    

12. 设置远程访问

    grant all privileges on *.* to 'root' @'%' identified by '123456';flush privileges;
    

13. 卸载

    #强制删除已安装MySQL
    rpm -e --nodeps mysql-community-libs
    rpm -e --nodeps mysql-community-client
    rpm -e --nodeps mysql-community-server
    rpm -e --nodeps mysql57-community-release
    rpm -e --nodeps mysql-community-common
    rpm -qa|grep mysql#查找所有MySQL目录并删除：find / -name mysql 
    find / -name mysql
    find: ‘/proc/35432’: 没有那个文件或目录
    #/var/lib/mysql
    #/var/lib/mysql/mysql
    #/usr/lib64/mysql
    #/usr/share/mysql
    rm -rf /var/lib/mysql
    rm -rf /usr/share/mysql
    rm -rf /usr/lib64/mysql

    删除my.cnf：rm -f /etc/my.cnf

    rm -f /etc/my.cnf