懒得设置格式了吗，就这么玩吧。
log-error=/var/log/mariadb/mariadb.log
pid-file=/var/run/mariadb/mariadb.pid
rm -rf /usr/share/mysql
rm -rf /usr/local/mysql
rm -rf /usr/local/mysql/data/mysql
rm -rf /usr/local/mysql/include/mysql
rm -rf /usr/local/mysql/bin/mysql
rm -rf /usr/lib64/mysql
rm -rf /run/lock/subsys/mysql
rm -rf /home/mysql
rm -rf /etc/selinux/targeted/active/modules/100/mysql
rm -rf /var/spool/mail/mysql
rm -rf /var/lib/mysql
rm -rf /var/lib/mysql/mysql
rm -rf /root/mysql-5.7.28-linux-glibc2.12-x86_64/include/mysql
rm -rf /root/mysql-5.7.28-linux-glibc2.12-x86_64/bin/mysql
rm -rf /etc/my.cnf
//找个合适的地方下载mysql
wget -c https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.28-linux-glibc2.12-x86_64.tar.gz
//关闭mydql
service mysqld stop
//检查是否有rpm包，如果没有用rpm安装过mysql，不应该有残留，如果有，需要删掉
rpm -qa|grep -i mysql //删除语法: rpm -e <包的名字>
//通过find命令检查是否有安装mysql文件，有需要删除
find / -name mysql
rm -rf /usr/local/mysql
rm -rf /home/mysql
rm -rf /var/spool/mail/mysql
//删除mysql用户
userdel -r -f mysql
//新建用户
groupadd mysql
useradd -g mysql mysql
passwd mysql
//解压文件，移动到/usr/local/mysql
tar -zxvf mysql-5.7.28-linux-glibc2.12-x86_64.tar.gz
mv mysql-5.7.28-linux-glibc2.12-x86_64 /usr/local/mysql
//打开文件夹，创建data
cd /usr/local/mysql
mkdir data
//返回上一级，设置文件夹权限
cd …
chown -R mysql mysql/
chgrp -R mysql mysql/
//编辑配置文件
vim /etc/my.cnf
#内容是：（原来内容全部删掉）
[client]
port = 3306
socket = /tmp/mysql.sock
[mysqld]
character_set_server=utf8
init_connect=‘SET NAMES utf8’
basedir=/usr/local/mysql
datadir=/usr/local/mysql/data
socket=/tmp/mysql.sock
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
myisam-recover = BACKUP
#不区分大小写
lower_case_table_names = 1
sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
max_connections=5000
default-time_zone = ‘+8:00’
//准备初始化
#先安装一下这个东东，要不然初始化有可能会报错
yum install libaio
#手动编辑一下日志文件，什么也不用写，直接保存退出
cd /var/log/
//创建并保存空的mysqld.log
vim mysqld.log
步骤insert->esc->:wq
//权限设置
chmod 777 mysqld.log
chown mysql:mysql mysqld.log
//初始化
/usr/local/mysql/bin/mysqld --initialize --user=mysql --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --lc_messages_dir=/usr/local/mysql/share --lc_messages=en_US --skip-grant-tables
//查看初始密码
cat /var/log/mysqld.log
执行后关注最后一点：root@localhost: 这里就是初始密码
我的是;q)iisH11Wed
//开机
cd /var/run/
mkdir mysqld
chmod 777 mysqld
cd mysqld
vim mysqld.pid //创建后:wq!
chmod 777 mysqld.pid
chown mysql:mysql mysqld.pid
/usr/local/mysql/support-files/mysql.server start
/usr/local/mysql/bin/mysql -uroot -p 你在上面看到的初始密码
//设置密码.(貌似没作用，直接用123456登录)
set password=password(‘新密码’);
flush privileges;//mysql 新设置用户或更改密码后需用flush privileges刷新MySQL的系统权限相关表
UPDATE mysql.user SET Host = ‘%’, User = ‘root’ WHERE (Host = ‘localhost’) AND (User = ‘root’);
//数据库配置
use mysql;
UPDATE mysql.user SET Host=’%’, User=‘root’, Select_priv=‘Y’, Insert_priv=‘Y’, Update_priv=‘Y’, Delete_priv=‘Y’, Create_priv=‘Y’, Drop_priv=‘Y’, Reload_priv=‘Y’, Shutdown_priv=‘Y’, Process_priv=‘Y’, File_priv=‘Y’, Grant_priv=‘Y’, References_priv=‘Y’, Index_priv=‘Y’, Alter_priv=‘Y’, Show_db_priv=‘Y’, Super_priv=‘Y’, Create_tmp_table_priv=‘Y’, Lock_tables_priv=‘Y’, Execute_priv=‘Y’, Repl_slave_priv=‘Y’, Repl_client_priv=‘Y’, Create_view_priv=‘Y’, Show_view_priv=‘Y’, Create_routine_priv=‘Y’, Alter_routine_priv=‘Y’, Create_user_priv=‘Y’, Event_priv=‘Y’, Trigger_priv=‘Y’, Create_tablespace_priv=‘Y’, ssl_type=’’, ssl_cipher=’’, x509_issuer=’’, x509_subject=’’, max_questions=‘0’, max_updates=‘0’, max_connections=‘0’, max_user_connections=‘0’, plugin=‘mysql_native_password’, authentication_string=’*6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9’, password_expired=‘N’, password_last_changed=‘2017-11-20 12:41:07’, password_lifetime=NULL, account_locked=‘N’ WHERE (User=‘root’);
flush privileges;
//右键复制新的ssh连接，或者ctrl+z
//开机自启
cd /usr/local/mysql/support-files
cp mysql.server /etc/init.d/mysqld
chkconfig --add mysqld
//使用service mysqld命令启动/停止服务
su - mysql
service mysqld start/stop/restart
/usr/local/mysql/bin/mysql -uroot -p
//输密码
远程用户建立
grant all privileges on . to ‘admin’@’%’ identified by ‘1234’;
flush privileges;
ln -s /usr/local/mysql/bin/mysql /usr/bin//相当于建立一个链接文件。-s进行软链结。这样mysql命令才有用
//尝试关闭、启动、重启、连接
service mysqld stop
service mysqld start
service mysqld restart
mysql -h 127.0.0.1 -P 3306 -u root -p 123456
mysql -h 127.0.0.1 -P 3306 -u admin -p 1234
//大功告成