安装:
https://blog.csdn.net/qq_42339484/article/details/81914221

忘记密码：
https://www.cnblogs.com/lixiuming521125/p/7066911.html

远程访问设置:
https://blog.csdn.net/wang__wyj/article/details/81303424

1. 检测系统是否已安装 mysql

  [root@localhost ~]# yum list installed | grep mysql

2. 删除系统已安装的 mysql 及其依赖

  [root@localhost ~]# yum -y remove mysql-libs.i686

3. 给CentOS添加rpm源

    wget http://repo.mysql.com//mysql-community-release-el6-5.noarch.rpm

4.安装yum源

[root@localhost ~]# yum install mysql-community-release-el6-5.noarch.rpm
    [root@localhost ~]# yum repolist all | grep mysql
    [root@localhost ~]# yum repolist all | grep mysql
    [root@localhost ~]# yum-config-manager --disable mysql55-community
    [root@localhost ~]# yum-config-manager --disable mysql56-community
    [root@localhost ~]# yum-config-manager --enable mysql57-community-dmr

5. 安装 MySQL 服务端

 ```
yum install mysql-community-server
Dependency Installed:
mysql-community-client.x86_64 0:5.7.22-1.el6 
mysql-community-common.x86_64 0:5.7.22-1.el6 
mysql-community-libs.x86_64 0:5.7.22-1.el6

Complete!
看到以上结束语句，表示安装成功

6. 启动 mysql 服务

 service mysqld start

7查看启动是否成功：

 service mysqld status
    

mysqld (pid 10698) 正在运行...

7. 修改 root 初始密码

我这里用的是安全模式下进入设置密码

   service mysqld stop
   mysqld_safe –skip-grant-tables &

重新开一个终端输入一下命令，然后直接敲enterj键：
[root@localhost ~]#mysql -uroot -p
进入之后，敲use mysql,用mysql数据库;
修改root用户密码

    mysql> update user set authentication_string=password(123456) where user='root'; 

注：mysql5.7的密码字段是authentication_string，不是password
刷新权限并退出

    mysql> >flush privileges;
    mysql> >quit
    ```
##重启mysql，用密码123456即可登录mysql

[root@localhost ~]# service mysqld restart
[root@localhost ~]# mysql -u root -p

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

出现以上内容，登录成功

##8.  设置mysql开机启动

[root@localhost ~]# chkconfig mysqld on
[root@localhost ~]# chkconfig mysqld status