先介绍卸载
yum方式
查看yum是否安装过mysql yum list installed mysql*- 1
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如或显示了列表，说明系统中有MySQL 
yum卸载
根据列表上的名字yum remove mysql-community-client mysql-community-common mysql-community-libs mysql-community-libs-compat mysql-community-server mysql57-community-release rm -rf /var/lib/mysql rm /etc/my.cnf- 1
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rpm查看安装
rpm -qa | grep -i mysql- 1
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rpm 卸载
rpm -e mysql57-community-release-el7-9.noarch rpm -e mysql-community-server-5.7.17-1.el7.x86_64 rpm -e mysql-community-libs-5.7.17-1.el7.x86_64 rpm -e mysql-community-libs-compat-5.7.17-1.el7.x86_64 rpm -e mysql-community-common-5.7.17-1.el7.x86_64 rpm -e mysql-community-client-5.7.17-1.el7.x86_64 cd /var/lib/ rm -rf mysql/- 1
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清除余项
whereis mysql mysql: /usr/bin/mysql /usr/lib64/mysql /usr/local/mysql /usr/share/mysql /usr/share/man/man1/mysql.1.gz #删除上面的文件夹 rm -rf /usr/bin/mysql- 1
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…
…
我就省略了删除配置
rm –rf /usr/my.cnf rm -rf /root/.mysql_sercret- 1
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剩余配置检查
chkconfig --list | grep -i mysql
chkconfig --del mysqld
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根据上面的列表，删除 ,如：mysqld
再介绍安装
- 注意
yum源，阿里的CentOS7.repo是没有的，国外源相当慢，做好心理准备。 - 下载地址
http://dev.mysql.com/downloads/
下载页面
按照官方的文档进行安装
http://dev.mysql.com/doc/refman/5.7/en/installing.html 
http://dev.mysql.com/doc/refman/5.7/en/linux-installation.html
文档地址：http://dev.mysql.com/doc/refman/5.7/en/linux-installation.html
3是各种安装方式列表
CentOS用yum安装相对省事，省去很多配置环节
yum安装，先要搞到源
wget http://repo.mysql.com/mysql57-community-release-el7-9.noarch.rpm
sudo rpm -ivh mysql57-community-release-el7-9.noarch.rpm
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接下来使用yum安装
更新yum软件包
yum check-update
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更新系统
yum update
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安装mysql
yum install mysql mysql-server
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接下来是漫长的等待。如果中途关机，或者下载挂了，请执行卸载步骤后，再来一次。
完成后
记住要给root上密码
/usr/local/mysql/bin/mysqld_safe --skip-grant-tables --user=mysql &
systemctl start mysqld
mysql -u root
mysql> update mysql.user set authentication_string=password('new_password') where user='root' and Host ='localhost';
mysql> flush privileges;
mysql> quit;
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启动与开放远程访问
systemctl start mysqld
mysql -u root -p
+ 授权远程访问
use mysql;
grant all privileges on *.* to root@'%' identified by "root";
FLUSH RIVILEGES;
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建议root不要授权远程访问，请创建新mysql用户
mysql> show databases;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
解决如下：
1： SET PASSWORD = PASSWORD('123456@Qpf');
2：ALTER USER 'root'@'localhost' PASSWORD EXPIRE NEVER;
3：flush privileges;
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
4 rows in set (0.00 sec)
Fei joe 清华同衡thupdi