centos 7安装mysql

下载mysql
http://pan.baidu.com/s/1dDu6n9R
查看本机mariadb相关文件

rpm -qa | grep mariadb

全部用类似下面的命令进行铲除

rpm -e --nodeps mariadb-libs-5.5.35-3.el7.x86_64

然后安装，（文件名以你下载的为准）

rpm -ivh MySQL-client-advanced-5.6.22-1.el7.x86_64.rpm

rpm -ivh MySQL-devel-advanced-5.6.22-1.el7.x86_64.rpm

rpm -ivh MySQL-server-advanced-5.6.22-1.el7.x86_64.rpm

启动mysql命令：

service mysql start

报错：

[Warning]
TIMESTAMP with implicit
DEFAULT value
is deprecated.
Please use
--explicit_defaults_for_timestamp server option (see documentation for more details).[Warning]
Buffered warning: Changed limits:
max_open_files:
1024
(requested
5000)

[Warning] Buffered warning: Changed limits: table_cache: 431 (requested 2000)
[Note] Plugin 'FEDERATED' is disabled.
[Note] InnoDB: Using atomics to ref count buffer pool pages
[Note] InnoDB: The InnoDB memory heap is disabled
[Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
[Note] InnoDB: Memory barrier is not used
[Note] InnoDB: Compressed tables use zlib 1.2.3
[Note] InnoDB: Using Linux native AIO
[Note] InnoDB: Using CPU crc32 instructions
[Note] InnoDB: Initializing buffer pool, size = 128.0M
[Note] InnoDB: Completed initialization of buffer pool
InnoDB: Error: pthread_create returned 13
mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended

据说的问题1：打开文件数不足修改下面的文件

vi /etc/security/limits.conf

据说的问题2：/var/lib/mysql 的权限不足：

好吧：chmod -R 755/var/lib/mysql

据说的问题3：修改my.cnf，
输入mysql --help|grep my.cnf，查看到文件可能存在的位置，好吧一个都没有

据说应该mysql/my-medium.cnf里面复制一个出来，然后网上找了一个开始到路径里面乱改起来

据说的问题4：selinux问题，

打开/etc/selinux/config，把SELINUX=enforcing改为SELINUX=disabled后存盘退出重启机器。

我都不知道重启多少次了，setenforce 0 命令可以直接设置，太好了。

终于可以启动了。

然后又是root密码不知道的问题

关闭mysql 输入：

mysqld_safe --skip-grant-tables &

然后可以用mysql -uroot登录了

然后

use mysql;

UPDATE user SET Password=PASSWORD('111111') where USER='root';

终于把该死的mysql弄好了

最后

service mysql start