2016-03-12T15:40:45.717762Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details). 2016-03-12T15:40:45.721644Z 0 [Note] mysqld (mysqld 5.7.11) starting as process 10904 ... 2016-03-12T15:40:45.741362Z 0 [ERROR] Fatal error: Please read "Security" section of the manual to find out how to run mysqld as root! 2016-03-12T15:40:45.741664Z 0 [ERROR] Aborting 2016-03-12T15:40:45.741726Z 0 [Note] Binlog end 2016-03-12T15:40:45.743453Z 0 [Note] mysqld: Shutdown complete
在虚拟机中安装了CentOS时安装了Nami版的Rendmine，没有设置MySQL自动启动，手动启动时出现 Please read "Security" section of the manual to find out how to run mysqld as root!错误，根据提示，查了 /opt/redmine-1.2.1-1/mysql/docs/mysql.info的Security部分，发现是因为MySQL为了安全，不希望root用户直接启动mysql。下面是文档中的原文：
*Never run the MySQL server as the Unix `root' user. This is
extremely dangerous, because any user with the `FILE' privilege is
able to cause the server to create files as `root' (for example,
`~root/.bashrc'). To prevent this, *Note `mysqld': mysqld. refuses
to run as `root' unless that is specified explicitly using the
`--user=root' option.
永远不要使用root帐号启动MySQL Server。这样做很微笑，因为拥有FILE'权限的用户会使得MySQL Server使用root帐户创建文件（比如，~root/.bashrc），为了防止类似的事情发生，mysqld默认拒绝用户使用root帐户启动，但root用户可以通过在命令后面加上"--user=root"选项来强行启动mysqld。
*Note `mysqld': mysqld. can (and should) be run as an ordinary,
unprivileged user instead. You can create a separate Unix account
named `mysql' to make everything even more secure. Use this
account only for administering MySQL. To start *Note `mysqld':
mysqld. as a different Unix user, add a `user' option that
specifies the user name in the `[mysqld]' group of the `my.cnf'
option file where you specify server options. For example:
[mysqld]
user=mysql
与使用root用户启动mysqld相比，更好的方法是使用一个普通的、没有高级权限的用户帐户允许mysqld，例如创建一个名为mysql的用户帐户来专门管理MySQL。使用其帐启
动MySQL的方法是在mysqld命令后面加上一个用户选项，这个用户属于mysqld用户组并且位于my.cnf配置文件中。例如在创建mysql帐户后，可以将下面的内容添加到my.cnf文
件中：
[mysqld]
user=mysql
This causes the server to start as the designated user whether you
start it manually or by using *Note `mysqld_safe': mysqld-safe. or
*Note `mysql.server': mysql-server. For more details, see *Note
changing-mysql-user::.
这个选项可以使你使用指定的用户帐户启动MySQL，无论是mysqld_safe还是mysql.server命令，都可以使用。
Running *Note `mysqld': mysqld. as a Unix user other than `root'
does not mean that you need to change the `root' user name in the
`user' table. _User names for MySQL accounts have nothing to do
with user names for Unix accounts_.
不要使用Unix的root用户启动并不意味着你要修改MySQL中的user表中的root用户名，因为Unix的root帐户和MySQL的root帐户没有什么关系。
http://www.xuebuyuan.com/762298.html
mysql>FLUSH PRIVILEGES; 加载权限表，让新密码生效！