centos6.8安装mysql5.6启动时出现Default config file /etc/my.cnf exists on the system...

[root@rhel6 mysql]# scripts/mysql_install_db --user=mysql --explicit_defaults_for_timestamp
Installing MySQL system tables...2015-11-04 08:48:03 0 [Note] ./bin/mysqld (mysqld 5.6.27) starting as process 3147 ...
2015-11-04 08:48:03 3147 [Note] InnoDB: Using atomics to ref count buffer pool pages
2015-11-04 08:48:03 3147 [Note] InnoDB: The InnoDB memory heap is disabled
2015-11-04 08:48:03 3147 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2015-11-04 08:48:03 3147 [Note] InnoDB: Memory barrier is not used
2015-11-04 08:48:03 3147 [Note] InnoDB: Compressed tables use zlib 1.2.3
2015-11-04 08:48:03 3147 [Note] InnoDB: Using CPU crc32 instructions
2015-11-04 08:48:03 3147 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2015-11-04 08:48:03 3147 [Note] InnoDB: Completed initialization of buffer pool
2015-11-04 08:48:03 3147 [Note] InnoDB: Highest supported file format is Barracuda.
2015-11-04 08:48:03 3147 [Note] InnoDB: 128 rollback segment(s) are active.
2015-11-04 08:48:03 3147 [Note] InnoDB: Waiting for purge to start
2015-11-04 08:48:03 3147 [Note] InnoDB: 5.6.27 started; log sequence number 1626007
2015-11-04 08:48:11 3147 [Note] Binlog end
2015-11-04 08:48:11 3147 [Note] InnoDB: FTS optimize thread exiting.
2015-11-04 08:48:11 3147 [Note] InnoDB: Starting shutdown...
2015-11-04 08:48:12 3147 [Note] InnoDB: Shutdown completed; log sequence number 1626017
OK


Filling help tables...2015-11-04 08:48:12 0 [Note] ./bin/mysqld (mysqld 5.6.27) starting as process 3171 ...
2015-11-04 08:48:12 3171 [Note] InnoDB: Using atomics to ref count buffer pool pages
2015-11-04 08:48:12 3171 [Note] InnoDB: The InnoDB memory heap is disabled
2015-11-04 08:48:12 3171 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2015-11-04 08:48:12 3171 [Note] InnoDB: Memory barrier is not used
2015-11-04 08:48:12 3171 [Note] InnoDB: Compressed tables use zlib 1.2.3
2015-11-04 08:48:12 3171 [Note] InnoDB: Using CPU crc32 instructions
2015-11-04 08:48:12 3171 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2015-11-04 08:48:12 3171 [Note] InnoDB: Completed initialization of buffer pool
2015-11-04 08:48:12 3171 [Note] InnoDB: Highest supported file format is Barracuda.
2015-11-04 08:48:12 3171 [Note] InnoDB: 128 rollback segment(s) are active.
2015-11-04 08:48:12 3171 [Note] InnoDB: Waiting for purge to start
2015-11-04 08:48:12 3171 [Note] InnoDB: 5.6.27 started; log sequence number 1626017
2015-11-04 08:48:12 3171 [Note] Binlog end
2015-11-04 08:48:12 3171 [Note] InnoDB: FTS optimize thread exiting.
2015-11-04 08:48:12 3171 [Note] InnoDB: Starting shutdown...
2015-11-04 08:48:14 3171 [Note] InnoDB: Shutdown completed; log sequence number 1626027
OK


To start mysqld at boot time you have to copy
support-files/mysql.server to the right place for your system


PLEASE REMEMBER TO SET A PASSWORD FOR THE MySQL root USER !
To do so, start the server, then issue the following commands:


  ./bin/mysqladmin -u root password 'new-password'
  ./bin/mysqladmin -u root -h rhel6.myexample.com password 'new-password'


Alternatively you can run:


  ./bin/mysql_secure_installation


which will also give you the option of removing the test
databases and anonymous user created by default.  This is
strongly recommended for production servers.


See the manual for more instructions.


You can start the MySQL daemon with:


  cd . ; ./bin/mysqld_safe &


You can test the MySQL daemon with mysql-test-run.pl


  cd mysql-test ; perl mysql-test-run.pl


Please report any problems at http://bugs.mysql.com/


The latest information about MySQL is available on the web at


  http://www.mysql.com


Support MySQL by buying support/licenses at http://shop.mysql.com


New default config file was created as ./my.cnf and
will be used by default by the server when you start it.
You may edit this file to change server settings


WARNING: Default config file /etc/my.cnf exists on the system
This file will be read by default by the MySQL server
If you do not want to use this, either remove it, or use the

--defaults-file argument to mysqld_safe when starting the server

当安装mysql时出现如上红色文字时，mysql启动不了，需要删除my.cnf,命令如下：

[root@rhel6 mysql]# rm -rf /etc/my.cnf
Installing MySQL system tables...2015-11-04 08:48:03 0 [Note] ./bin/mysqld (mysqld 5.6.27) starting as process 3147 ...
2015-11-04 08:48:03 3147 [Note] InnoDB: Using atomics to ref count buffer pool pages
2015-11-04 08:48:03 3147 [Note] InnoDB: The InnoDB memory heap is disabled
2015-11-04 08:48:03 3147 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2015-11-04 08:48:03 3147 [Note] InnoDB: Memory barrier is not used
2015-11-04 08:48:03 3147 [Note] InnoDB: Compressed tables use zlib 1.2.3
2015-11-04 08:48:03 3147 [Note] InnoDB: Using CPU crc32 instructions
2015-11-04 08:48:03 3147 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2015-11-04 08:48:03 3147 [Note] InnoDB: Completed initialization of buffer pool
2015-11-04 08:48:03 3147 [Note] InnoDB: Highest supported file format is Barracuda.
2015-11-04 08:48:03 3147 [Note] InnoDB: 128 rollback segment(s) are active.
2015-11-04 08:48:03 3147 [Note] InnoDB: Waiting for purge to start
2015-11-04 08:48:03 3147 [Note] InnoDB: 5.6.27 started; log sequence number 1626007
2015-11-04 08:48:11 3147 [Note] Binlog end
2015-11-04 08:48:11 3147 [Note] InnoDB: FTS optimize thread exiting.
2015-11-04 08:48:11 3147 [Note] InnoDB: Starting shutdown...
2015-11-04 08:48:12 3147 [Note] InnoDB: Shutdown completed; log sequence number 1626017
OK


Filling help tables...2015-11-04 08:48:12 0 [Note] ./bin/mysqld (mysqld 5.6.27) starting as process 3171 ...
2015-11-04 08:48:12 3171 [Note] InnoDB: Using atomics to ref count buffer pool pages
2015-11-04 08:48:12 3171 [Note] InnoDB: The InnoDB memory heap is disabled
2015-11-04 08:48:12 3171 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2015-11-04 08:48:12 3171 [Note] InnoDB: Memory barrier is not used
2015-11-04 08:48:12 3171 [Note] InnoDB: Compressed tables use zlib 1.2.3
2015-11-04 08:48:12 3171 [Note] InnoDB: Using CPU crc32 instructions
2015-11-04 08:48:12 3171 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2015-11-04 08:48:12 3171 [Note] InnoDB: Completed initialization of buffer pool
2015-11-04 08:48:12 3171 [Note] InnoDB: Highest supported file format is Barracuda.
2015-11-04 08:48:12 3171 [Note] InnoDB: 128 rollback segment(s) are active.
2015-11-04 08:48:12 3171 [Note] InnoDB: Waiting for purge to start
2015-11-04 08:48:12 3171 [Note] InnoDB: 5.6.27 started; log sequence number 1626017
2015-11-04 08:48:12 3171 [Note] Binlog end
2015-11-04 08:48:12 3171 [Note] InnoDB: FTS optimize thread exiting.
2015-11-04 08:48:12 3171 [Note] InnoDB: Starting shutdown...
2015-11-04 08:48:14 3171 [Note] InnoDB: Shutdown completed; log sequence number 1626027
OK


To start mysqld at boot time you have to copy
support-files/mysql.server to the right place for your system


PLEASE REMEMBER TO SET A PASSWORD FOR THE MySQL root USER !
To do so, start the server, then issue the following commands:


  ./bin/mysqladmin -u root password 'new-password'
  ./bin/mysqladmin -u root -h rhel6.myexample.com password 'new-password'


Alternatively you can run:


  ./bin/mysql_secure_installation


which will also give you the option of removing the test
databases and anonymous user created by default.  This is
strongly recommended for production servers.


See the manual for more instructions.


You can start the MySQL daemon with:


  cd . ; ./bin/mysqld_safe &


You can test the MySQL daemon with mysql-test-run.pl


  cd mysql-test ; perl mysql-test-run.pl


Please report any problems at http://bugs.mysql.com/


The latest information about MySQL is available on the web at


  http://www.mysql.com


Support MySQL by buying support/licenses at http://shop.mysql.com


New default config file was created as ./my.cnf and
will be used by default by the server when you start it.
You may edit this file to change server settings


WARNING: Default config file /etc/my.cnf exists on the system
This file will be read by default by the MySQL server
If you do not want to use this, either remove it, or use the
--defaults-file argument to mysqld_safe when starting the server