安装前的准备

Step1: 如果你系统已经有mysql，如一般centos自带mysql5.1系列，那么你需要删除它，先检查一下系统是否自带mysql

yum list installed | grep mysql

Step2: 删除系统自带的mysql及其依赖命令

yum -y remove mysql-libs.x86_64

Step3: 给CentOS添加rpm源，并且选择较新的源命令

wget dev.mysql.com/get/mysql-community-release-el6-5.noarch.rpm
yum localinstall mysql-community-release-el6-5.noarch.rpm
yum repolist all | grep mysql
yum-config-manager --disable mysql55-community
yum-config-manager --disable mysql56-community
yum-config-manager --enable mysql57-community-dmr
yum repolist enabled | grep mysql

开始安装

Step4：安装mysql 服务器命令

yum install mysql-community-server

Step5: 启动mysql命令

service mysqld start

Step6: 查看mysql是否自启动,并且设置开启自启动命令

chkconfig --list | grep mysqld
chkconfig mysqld on

mysql5.7安装完后如何开启远程root包括远程用户权限

mysql5.7对于安全模块进行了升级，因此如果你想像以前那样在安装完mysql后直接以mysql -u root登录进去再通过一系列的sql命令来更改权限但是这在mysql5.7上是行不通的，按照以前的做法，你会在面临mysql5.7碰到这样的一个报错“access denied for user root@localhost” ，因此请按照以下使用说明操作。

Step1: 停止mysqld服务并使用mysqld safe启动

service mysqld stop
mysqld_safe --user=mysql --skip-grant-tables --skip-networking &

Step2：登录mysql

此时，你在mysql服务器上使用

mysql -uroot -p

就可以登录mysql了

Step3: 更改mysql安全密码

先説一下原因，mysql5.7出现这样的问题，是因为MYSQL5.6之后，加强了对安全性的管控，认为root用户进行mysql操作是一种危险的行为，于是限制了root用户登录mysql（）。但是我们可以通过修改Mysql中user表的方法解决该问题
（网络上还有一种做法是查看/var/log/mysql.log，该文件内有安装后Mysql生成的随机密码，然后用文件里的密码正常登录即可，有兴趣者自己可以试下，此处使用正规操作步骤）

mysql> SET PASSWORD = PASSWORD('ur password here');

Step4：更改mysql root的密码（和Step3中保持一致）

update mysql.user set authentication_string=password('newpassword') where user='root'

之前的mysql版本为：

UPDATE user SET Password=PASSWORD('newpassword') where USER='root';
flush privileges;

而mysql5.7已经把PASSWORD字段改名成了"authentication_string"这个名字了，此处需要注意了。

Step5：建立可供远程连接的root用户

GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'ur password here' WITH GRANT OPTION;

Step6：在远程装个mysql workbench然后用远程root登录，爱干吗干吗吧

MYSQL核心配置文件示例

虚拟CPU 6C
内存：6GB
优化过的配置如下：

# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html


[mysqld]
#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
#
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
#
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.


join_buffer_size = 128M
sort_buffer_size = 6M
read_rnd_buffer_size = 4M


#deprecate this option after mysql5.5 default-character-set = utf8


character-set-server=utf8
open_files_limit    = 10240
back_log = 384
max_connections = 500
#deprecate this option after mysql5.5 table_cache = 512K
max_allowed_packet =16M
query_cache_size = 384M
table_open_cache = 512 
key_buffer_size = 384M 


datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock


# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0


log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid


slow_query_log_file = /var/log/mysqld-slow-query.log  
log-short-format
long-query-time = 3  
#log-long-format  
#log-slow-admin-statements  
log-queries-not-using-indexes