1. Install Nginx/PHP/PHP-FPM

First setup new packages source repos.

Remi Dependency on CentOS 7 and Red Hat (RHEL) 7

rpm -Uvh http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-1.noarch.rpm

CentOS 7 and Red Hat (RHEL) 7

rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-7.rpm

Create file /etc/yum.repos.d/nginx.repo and add following content to repo file:

[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/$releasever/$basearch/
gpgcheck=0
enabled=1

Then install nginx and php.

yum --enablerepo=remi,remi-php56 install nginx php-fpm php-common

yum --enablerepo=remi,remi-php56 install php-opcache php-pecl-apcu php-cli php-pear php-pdo php-mysqlnd php-pgsql php-pecl-mongo php-pecl-sqlite php-pecl-memcache php-pecl-memcached php-gd php-mbstring php-mcrypt php-xml

yum --enablerepo=remi,remi-php56 install php-redis

Last start all the services:

service php-fpm start
service nginx start
service redis start

Set SELinux to permissive mode:

setenforce 0 

2. Install MariaDB

Remove old packages if alread installed before.

yum remove mysql* mysql-server mysql-devel mysql-libs
or yum remove mariadb-libs-1:5.5.37-1.el7_0.x86_64

Then run commands to install MariaDB 10.1.

yum install MariaDB-server MariaDB-client

If no error raised, then start MariaDB:

/etc/init.d/mysql start

3. Open ports for incoming requests

First run iptables --line -vnL to find the line number of the REJECT rule:

# iptables --line -vnL
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
num   pkts bytes target     prot opt in     out     source               destination
1    48563   67M ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            ctstate RELATED,ESTABLISHED
2       21  1434 ACCEPT     all  --  lo     *       0.0.0.0/0            0.0.0.0/0
3     101K 8704K INPUT_direct  all  --  *      *       0.0.0.0/0            0.0.0.0/0
4     101K 8704K INPUT_ZONES_SOURCE  all  --  *      *       0.0.0.0/0            0.0.0.0/0
5     101K 8704K INPUT_ZONES  all  --  *      *       0.0.0.0/0            0.0.0.0/0
6        0     0 ACCEPT     icmp --  *      *       0.0.0.0/0            0.0.0.0/0
7     101K 8704K REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

Here the number is 7 , So the new iptables rule will be:

iptables -I INPUT 7 -i em4 -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT

iptables -I INPUT 7 -i em4 -p tcp --dport 3306 -m state --state NEW,ESTABLISHED -j ACCEPT

Don't forget to specify correct network interface if yours is not em4.

reference:

1. http://www.if-not-true-then-false.com/2011/install-nginx-php-fpm-on-fedora-centos-red-hat-rhel/
2. http://www.binarytides.com/open-http-port-iptables-centos/
3. http://www.unixmen.com/install-lemp-nginx-with-mariadb-and-php-on-centos-6/