处理其他DB
首先执行以下命令处理yum上的其他分发类型的数据库。
yum list installed mariadb\*
yum list installed Percona\*
执行以上命令若有显示，请执行以下命令。
yum-config-manager --disable mariadb
yum-config-manager --disable percona-release
卸载其他分发数据库
yum remove MariaDB-common MariaDB-compat MariaDB-server
yum remove Percona-Server-client-55 Percona-Server-server-55 \
Percona-Server-shared-55.i686 percona-release
安装mysql的yum源
访问以下链接获取到red hat的rpm文件地址，并使用wget命令下载到服务器上。
https://dev.mysql.com/downloads/repo/yum/
也可以直接下载后使用ftp上传到服务器上。
安装yum源
yum localinstall mysql*****.noarch.rpm
检查mysql源
yum repolist enabled | grep "mysql.*-community.*"
安装mysql
yum install mysql-community-server
启动mysql
systemctl start mysqld
查看启动状态
systemctl status mysqld
设置开机启动
systemctl enable mysqld
systemctl daemon-reload
查看生成的mysql root密码
grep 'temporary password' /var/log/mysqld.log
在root@localhost:后面的就是mysql密码，复制下来即可。
登陆mysql
mysql -u root -p
粘贴密码。
设置root用户密码(请设置符合mysql57要求的高强度密码)
set password for root@localhost = password('your password！！');
use mysql;
设置root用户可远程连接
update user set host = '%' where user ='root';
刷新用户权限
flush privileges;
在mysql中执行以下命令设置数据库编码（直接复制所有命令然后回车确认一次即可）
set character_set_client = utf8;
set character_set_server = utf8;
set character_set_connection = utf8;
set character_set_database = utf8;
set character_set_results = utf8;
set collation_connection = utf8_general_ci;
set collation_database = utf8_general_ci;
set collation_server = utf8_general_ci;
查看mysql编码
show variables like 'character%';
显示如下内容代表成功
+-–-–-–-–-–-–-–-—-+-–-–-–-–-–-–-–-–-—+
| Variable_name | Value |
+-–-–-–-–-–-–-–-—-+-–-–-–-–-–-–-–-–-—+
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | utf8 |
| character_set_filesystem | binary |
| character_set_results | utf8 |
| character_set_server | utf8 |
| character_set_system | utf8 |
| character_sets_dir | /usr/share/mysql/charsets/ |
+-–-–-–-–-–-–-–-—-+-–-–-–-–-–-–-–-–-—+
8 rows in set (0.01 sec)
保存后重启MySQL服务
service mysql restart
添加防火墙端口
firewall-cmd --permanent --zone=public --add-port=3306/tcp
重载防火墙配置
firewall-cmd --reload