CentOS 7 yum nginx MySQL PHP 简易环境搭建
用centos自带的yum源来安装nginx，mysql和php，超级方便，省去编译的麻烦，省去自己配置的麻烦，还能节省非常多的时间。
我们先把yum源换成国内的阿里云镜像源（当然不换也可以），先备份一下原来的源镜像文件，以免出错后可以恢复：
[root@192 ~]# mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
下载新的CentOS-Base.repo 到/etc/yum.repos.d/，版本根据自己的系统版本选择下载：
CentOS 5
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo
CentOS 6
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
CentOS 7
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
更改/etc/yum.repos.d/CentOS-Media.repo使其为不生效：
enabled=0
运行yum makecache生成缓存:
yum clean all
yum makecache
yum update
安装Nginx
由于yum源中没有我们想要的nginx，那么我们就需要创建一个“/etc/yum.repos.d/nginx.repo”的文件，其实就是新增一个yum源。
[root@192 yum.repos.d]# vi /etc/yum.repos.d/nginx.repo
把如下内容复制进去：
[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/$releasever/$basearch/
gpgcheck=0
enabled=1
然后保存退出，输入 yum list nginx 查看，
[root@192 yum.repos.d]# yum list nginx
已加载插件：fastestmirror
nginx | 2.9 kB 00:00:00
nginx/7/x86_64/primary_db | 18 kB 00:00:04
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
可安装的软件包
nginx.x86_64 1:1.10.2-1.el7.ngx nginx
[root@192 yum.repos.d]# yum list |grep nginx
nginx.x86_64 1:1.10.2-1.el7.ngx nginx
nginx-debug.x86_64 1:1.8.0-1.el7.ngx nginx
nginx-debuginfo.x86_64 1:1.10.2-1.el7.ngx nginx
nginx-module-geoip.x86_64 1:1.10.2-1.el7.ngx nginx
nginx-module-geoip-debuginfo.x86_64 1:1.10.2-1.el7.ngx nginx
nginx-module-image-filter.x86_64 1:1.10.2-1.el7.ngx nginx
nginx-module-image-filter-debuginfo.x86_64 1:1.10.2-1.el7.ngx nginx
nginx-module-njs.x86_64 1:1.10.2.0.0.20160414.1c50334fbea6-2.el7.ngx
nginx
nginx-module-njs-debuginfo.x86_64 1:1.10.2.0.0.20160414.1c50334fbea6-2.el7.ngx
nginx
nginx-module-perl.x86_64 1:1.10.2-1.el7.ngx nginx
nginx-module-perl-debuginfo.x86_64 1:1.10.2-1.el7.ngx nginx
nginx-module-xslt.x86_64 1:1.10.2-1.el7.ngx nginx
nginx-module-xslt-debuginfo.x86_64 1:1.10.2-1.el7.ngx nginx
nginx-nr-agent.noarch 2.0.0-10.el7.ngx nginx
pcp-pmda-nginx.x86_64 3.10.6-2.el7 base
[root@192 yum.repos.d]#
如果执行命令是这样的显示效果，那么我们的nginx的yum源就配置成功啦！
然后要安装我们的nginx就直接执行：
yum -y install nginx
这样nginx的最新官网版本就安装好了！
启动nginx：
# nginx #启动nginx
# curl 127.0.0.1
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
安装MySQL 5.7版本，官网http://dev.mysql.com/downloads/repo/yum/
rpm -Uvh http://dev.mysql.com/get/mysql57-community-release-el7-9.noarch.rpm
可以看到已经有了，并且5.7版本已经启用，可以直接安装：
root@192 yum.repos.d]# yum repolist all | grep mysql
mysql-connectors-community/x86_64 MySQL Connectors Community 启用: 24
mysql-connectors-community-source MySQL Connectors Community - Sourc 禁用
mysql-tools-community/x86_64 MySQL Tools Community 启用: 38
mysql-tools-community-source MySQL Tools Community - Source 禁用
mysql-tools-preview/x86_64 MySQL Tools Preview 禁用
mysql-tools-preview-source MySQL Tools Preview - Source 禁用
mysql55-community/x86_64 MySQL 5.5 Community Server 禁用
mysql55-community-source MySQL 5.5 Community Server - Sourc 禁用
mysql56-community/x86_64 MySQL 5.6 Community Server 禁用
mysql56-community-source MySQL 5.6 Community Server - Sourc 禁用
mysql57-community/x86_64 MySQL 5.7 Community Server 启用: 146
mysql57-community-source MySQL 5.7 Community Server - Sourc 禁用
mysql80-community/x86_64 MySQL 8.0 Community Server 禁用
mysql80-community-source MySQL 8.0 Community Server - Sourc 禁用
[root@192 yum.repos.d]#
如果没有开启，或者你想要选择需要的版本进行安装，修改 /etc/yum.repos.d/mysql-community.repo，选择需要的版本把enable改为1即可，其它的改为0：
修改好后查看可用的安装版本：
[root@192 yum.repos.d]# yum repolist enabled | grep mysql
mysql-connectors-community/x86_64 MySQL Connectors Community 24
mysql-tools-community/x86_64 MySQL Tools Community 38
mysql57-community/x86_64 MySQL 5.7 Community Server 146
不用犹豫，开始安装吧！
yum -y install mysql-community-server
……经过漫长的等待后，看到下图所示：
开始启动mysql：
service mysqld start
Redirecting to /bin/systemctl start mysqld.service
看下mysql的启动状态：
[root@192 yum.repos.d]# service mysqld status
Redirecting to /bin/systemctl status mysqld.service
● mysqld.service - MySQL Server
Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
Active: active (running) since 日 2016-10-23 22:51:48 CST; 3min 14s ago
Process: 36884 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)
Process: 36810 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
Main PID: 36887 (mysqld)
CGroup: /system.slice/mysqld.service
└─36887 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid
10月 23 22:51:45 192.168.0.14 systemd[1]: Starting MySQL Server...
10月 23 22:51:48 192.168.0.14 systemd[1]: Started MySQL Server.
10月 23 22:52:24 192.168.0.14 systemd[1]: Started MySQL Server.
开机启动设置：
systemctl enable mysqld
systemctl daemon-reload
mysql安装完成之后，在/var/log/mysqld.log文件中给root生成了一个默认密码。通过下面的方式找到root默认密码，然后登录mysql进行修改：
[root@192 yum.repos.d]# grep 'temporary password' /var/log/mysqld.log
2016-10-23T14:51:45.705458Z 1 [Note] A temporary password is generated for root@localhost: a&sqr7dou7N_
mysql -uroot -p
修改root密码：
ALTER USER 'root'@'localhost' IDENTIFIED BY 'NewPassWord!';
注意：mysql5.7默认安装了密码安全检查插件，默认密码检查策略要求密码必须包含：大小写字母、数字和特殊符号，并且长度不能少于8位。否则会提示ERROR 1819 (HY000): Your password does not satisfy the current policy requirements错误，如下图所示：
通过msyql环境变量可以查看密码策略的相关信息：
mysql> show variables like '%password%';
+---------------------------------------+--------+
| Variable_name | Value |
+---------------------------------------+--------+
| default_password_lifetime | 0 |
| disconnect_on_expired_password | ON |
| log_builtin_as_identified_by_password | OFF |
| mysql_native_password_proxy_users | OFF |
| old_passwords | 0 |
| report_password | |
| sha256_password_proxy_users | OFF |
| validate_password_check_user_name | OFF |
| validate_password_dictionary_file | |
| validate_password_length | 8 |
| validate_password_mixed_case_count | 1 |
| validate_password_number_count | 1 |
| validate_password_policy | MEDIUM |
| validate_password_special_char_count | 1 |
+---------------------------------------+--------+
14 rows in set (0.00 sec)
validate_password_policy：密码策略，默认为MEDIUM策略
validate_password_dictionary_file：密码策略文件，策略为STRONG才需要
validate_password_length：密码最少长度
validate_password_mixed_case_count：大小写字符长度，至少1个
validate_password_number_count ：数字至少1个
validate_password_special_char_count：特殊字符至少1个
上述参数是默认策略MEDIUM的密码检查规则。
修改密码策略
如果想修改密码策略，在/etc/my.cnf文件添加validate_password_policy配置：
# 选择0（LOW），1（MEDIUM），2（STRONG）其中一种，选择2需要提供密码字典文件
validate_password_policy=0
配置默认编码为utf8
修改/etc/my.cnf配置文件，在[mysqld]下添加编码配置，如下所示：
[mysqld]
character_set_server=utf8
init_connect='SET NAMES utf8'
重新启动mysql服务使配置生效：
systemctl restart mysqld
添加远程登录用户
默认只允许root帐户在本地登录，如果要在其它机器上连接mysql，必须修改root允许远程连接，或者添加一个允许远程连接的帐户，为了安全起见，我们添加一个新的帐户：
mysql> GRANT ALL PRIVILEGES ON *.* TO 'evai'@'%' IDENTIFIED BY '@evai2016' WITH GRANT OPTION;
mysql> FLUSH PRIVILEGES;
这样远程就可以用账户名为evai，密码为@evai2016来登录数据库了，运行 select host, user from mysql.user 查看下：
mysql> select host,user from mysql.user;
+-----------+-----------+
| host | user |
+-----------+-----------+
| % | evai |
| localhost | mysql.sys |
| localhost | root |
+-----------+-----------+
3 rows in set (0.00 sec)
安装PHP7
rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm
执行命令安装php7：
yum install php70w.x86_64 php70w-cli.x86_64 php70w-common.x86_64 php70w-gd.x86_64 php70w-ldap.x86_64 php70w-mbstring.x86_64 php70w-mcrypt.x86_64 php70w-mysql.x86_64 php70w-pdo.x86_64
安装php-fpm：
yum install php70w-fpm php70w-opcache
启动php-fpm：
systemctl start php-fpm
修改 /etc/nginx/conf.d/default.conf 文件，找到下面这段并改为如下所示：
location ~ \.php$ {
root /usr/share/nginx/html;
fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
}
接着到 /usr/share/nginx/html 目录下创建一个test.php文件，内容为phpinfo():
vi /usr/share/nginx/html/test.php
#内容
<?php
phpinfo();
保存退出。接着重启nginx：
nginx -s reload
打开浏览器，看到如下图说明运行成功：
至此环境搭建完成。
