Centos7环境MySQL安装简易方法

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　　Centos7环境MySQL5.6在线安装方法
　　备注：先确保centos可以联网，然后使用root账户登录centos，再如下五个步骤进行实施安装。
　　第一步使用rpm 工具进行在线下载MYSQL对应工程包
　　# rpm -Uvh http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm
　　获取http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm
　　准备中...                          ################################# [100%]
　　正在升级/安装...
　　1:mysql-community-release-el7-5    ################################# [100%]
　　第二步安装MYSQL客户端和服务端
　　一般来说，只要安装mysql-server跟mysql-client
　　**# yum -y install mysql-community-server
　　这个时候根据个人网速快慢，会下载对应的各种工程包进行自动安装，需要一段时间，安装结束如下信息：
　　*作为依赖被安装:
　　mysql-community-client.x8664 0:5.6.28-2.el7  mysql-community-common.x8664 0:5.6.28-2.el7
　　perl-Compress-Raw-Bzip2.x8664 0:2.061-3.el7  perl-Compress-Raw-Zlib.x8664 1:2.061-4.el7
　　perl-DBI.x8664 0:1.627-4.el7                 perl-IO-Compress.noarch 0:2.061-2.el7
　　perl-Net-Daemon.noarch 0:0.48-5.el7           perl-PlRPC.noarch 0:0.2020-14.el7
　　替代:
　　mariadb-libs.x8664 1:5.5.40-1.el70   *
　　完毕！
　　**第三步，设置开机启动
systemctl enable mysqld
　　启动mysql服务进程
systemctl start mysqld
　　第四部，设置密码
　　重置密码
mysql_secure_installation
　　NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MySQL
　　SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!
　　In order to log into MySQL to secure it, we'll need the current
　　password for the root user.  If you've just installed MySQL, and
　　you haven't set the root password yet, the password will be blank,
　　so you should just press enter here.
　　Enter current password for root (enter for none):
　　OK, successfully used password, moving on...
　　Setting the root password ensures that nobody can log into the MySQL
　　root user without the proper authorisation.
　　Set root password? [Y/n] y        [设置root用户密码]
　　New password:
　　Re-enter new password:
　　Password updated successfully!
　　Reloading privilege tables..
　　... Success!
　　By default, a MySQL installation has an anonymous user, allowing anyone
　　to log into MySQL without having to have a user account created for
　　them.  This is intended only for testing, and to make the installation
　　go a bit smoother.  You should remove them before moving into a
　　production environment.
　　Remove anonymous users? [Y/n] y            [删除匿名用户]
　　... Success!
　　Normally, root should only be allowed to connect from 'localhost'.  This
　　ensures that someone cannot guess at the root password from the network.
　　Disallow root login remotely? [Y/n] n            [禁止root远程登录]
　　... skipping.
　　By default, MySQL comes with a database named 'test' that anyone can
　　access.  This is also intended only for testing, and should be removed
　　before moving into a production environment.
　　Remove test database and access to it? [Y/n] y       [删除测试数据库]

• Dropping test database...　　ERROR 1008 (HY000) at line 1: Can't drop database 'test'; database doesn't exist
  　　... Failed!  Not critical, keep moving...
  
• Removing privileges on test database...　　... Success!
  

　　Reloading the privilege tables will ensure that all changes made so far
　　will take effect immediately.
　　Reload privilege tables now? [Y/n] y        [更新权限]
　　... Success!
　　All done!  If you've completed all of the above steps, your MySQL
　　installation should now be secure.
　　Thanks for using MySQL!
　　Cleaning up...
　　第五部，使用新密码设置验证登录
　　用新的密码登录，修改MySQL表支持非本机连接：
　　[root@MySQL ~]# mysql -u root –p123456
　　mysql> use mysql
　　Reading table information for completion of table and column names
　　You can turn off this feature to get a quicker startup with -A
　　Database changed
　　mysql> select host, user from user;
　　+-----------+-----------+
　　| host      | user      |
　　+-----------+-----------+
　　| localhost | mysql.sys |
　　| localhost | root      |
　　+-----------+-----------+
　　2 rows in set (0.00 sec)
　　mysql> update user set host = '%' where user = 'root';
　　Query OK, 1 row affected (0.00 sec)
　　Rows matched: 1  Changed: 1  Warnings: 0
　　mysql> select host, user from user;
　　+-----------+-----------+
　　| host      | user      |
　　+-----------+-----------+
　　| %         | root      |
　　| localhost | mysql.sys |
　　+-----------+-----------+
　　2 rows in set (0.00 sec)
　　mysql> flush privileges;     ------刷新生效
　　Query OK, 0 rows affected (0.00 sec)
　　mysql>