Added RHEL7/CentOS 7 compatible version of lamp_simple

RHEL7 version reflects changes in Red Hat Enterprise Linux and CentOS
7:
1. Network device naming scheme has changed
2. iptables is replaced
with firewalld
3. MySQL is replaced with MariaDB

lamp_simple_rhel7/LICENSE.md

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+Copyright (C) 2013 AnsibleWorks, Inc.
+
+This work is licensed under the Creative Commons Attribution 3.0 Unported License. 
+To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0/deed.en_US. 

lamp_simple_rhel7/README.md

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+Building a simple LAMP stack and deploying Application using Ansible Playbooks.
+-------------------------------------------
+
+These playbooks require Ansible 1.2.
+
+These playbooks are meant to be a reference and starter's guide to building
+Ansible Playbooks. These playbooks were tested on CentOS 7.x so we recommend
+that you use CentOS or RHEL to test these modules.
+
+RHEL7 version reflects changes in Red Hat Enterprise Linux and CentOS 7:
+1. Network device naming scheme has changed
+2. iptables is replaced with firewalld
+3. MySQL is replaced with MariaDB
+
+This LAMP stack can be on a single node or multiple nodes. The inventory file
+'hosts' defines the nodes in which the stacks should be configured.
+
+        [webservers]
+        localhost
+
+        [dbservers]
+        bensible
+
+Here the webserver would be configured on the local host and the dbserver on a
+server called "bensible". The stack can be deployed using the following
+command:
+
+        ansible-playbook -i hosts site.yml
+
+Once done, you can check the results by browsing to http://localhost/index.php.
+You should see a simple test page and a list of databases retrieved from the
+database server.

lamp_simple_rhel7/group_vars/all

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+---
+# Variables listed here are applicable to all host groups
+
+httpd_port: 80
+ntpserver: 192.168.1.2
+repository: https://github.com/bennojoy/mywebapp.git

lamp_simple_rhel7/group_vars/dbservers

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+---
+# The variables file used by the playbooks in the dbservers group.
+# These don't have to be explicitly imported by vars_files: they are autopopulated.
+
+mysqlservice: mysqld
+mysql_port: 3306
+dbuser: foouser
+dbname: foodb
+upassword: abc

lamp_simple_rhel7/hosts

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+[webservers]
+webserver.local
+
+[dbservers]
+dbserver.local
+
+

lamp_simple_rhel7/roles/common/handlers/main.yml

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+---
+# Handler to handle common notifications. Handlers are called by other plays.
+# See http://docs.ansible.com/playbooks_intro.html for more information about handlers.
+
+- name: restart ntp
+  service: name=ntpd state=restarted

lamp_simple_rhel7/roles/common/tasks/main.yml

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+---
+# This playbook contains common plays that will be run on all nodes.
+
+- name: Install ntp 
+  yum: name=ntp state=present
+  tags: ntp
+
+- name: Configure ntp file
+  template: src=ntp.conf.j2 dest=/etc/ntp.conf
+  tags: ntp
+  notify: restart ntp
+
+- name: Start the ntp service
+  service: name=ntpd state=started enabled=yes
+  tags: ntp

lamp_simple_rhel7/roles/common/templates/ntp.conf.j2

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+
+driftfile /var/lib/ntp/drift
+
+restrict 127.0.0.1 
+restrict -6 ::1
+
+server {{ ntpserver }}
+
+includefile /etc/ntp/crypto/pw
+
+keys /etc/ntp/keys
+

lamp_simple_rhel7/roles/db/handlers/main.yml

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+---
+# Handler to handle DB tier notifications
+
+- name: restart mariadb
+  service: name=mariadb state=restarted

lamp_simple_rhel7/roles/db/tasks/main.yml

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+---
+# This playbook will install MariaDB and create db user and give permissions.
+
+- name: Install MariaDB package
+  yum: name={{ item }} state=installed
+  with_items:
+   - mariadb-server
+   - MySQL-python
+   - libselinux-python
+   - libsemanage-python
+
+- name: Configure SELinux to start mysql on any port
+  seboolean: name=mysql_connect_any state=true persistent=yes
+
+- name: Create Mysql configuration file
+  template: src=my.cnf.j2 dest=/etc/my.cnf
+  notify: 
+  - restart mariadb
+
+- name: Create MariaDB log file
+  file: path=/var/log/mysqld.log state=touch owner=mysql group=mysql mode=0775
+
+- name: Create MariaDB PID directory
+  file: path=/var/run/mysqld state=directory owner=mysql group=mysql mode=0775
+
+- name: Start MariaDB Service
+  service: name=mariadb state=started enabled=yes
+
+- name: insert firewalld rule
+  firewalld: port={{ mysql_port }}/tcp permanent=true state=enabled immediate=yes
+
+- name: Create Application Database
+  mysql_db: name={{ dbname }} state=present
+
+- name: Create Application DB User
+  mysql_user: name={{ dbuser }} password={{ upassword }} priv=*.*:ALL host='%' state=present

lamp_simple_rhel7/roles/db/templates/my.cnf.j2

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+[mysqld]
+datadir=/var/lib/mysql
+socket=/var/lib/mysql/mysql.sock
+user=mysql
+# Disabling symbolic-links is recommended to prevent assorted security risks
+symbolic-links=0
+port={{ mysql_port }}
+
+[mysqld_safe]
+log-error=/var/log/mysqld.log
+pid-file=/var/run/mysqld/mysqld.pid

lamp_simple_rhel7/roles/web/tasks/copy_code.yml

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+---
+# These tasks are responsible for copying the latest dev/production code from
+# the version control system. 
+
+- name: Copy the code from repository
+  git: repo={{ repository }} dest=/var/www/html/
+
+- name: Creates the index.php file 
+  template: src=index.php.j2 dest=/var/www/html/index.php

lamp_simple_rhel7/roles/web/tasks/install_httpd.yml

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+---
+# These tasks install http and the php modules.
+
+- name: Install http and php etc
+  yum: name={{ item }} state=present
+  with_items:
+   - httpd
+   - php
+   - php-mysql
+   - git
+   - libsemanage-python
+   - libselinux-python
+
+- name: insert firewalld rule for httpd
+  firewalld: port={{ httpd_port }}/tcp permanent=true state=enabled immediate=yes
+
+- name: http service state
+  service: name=httpd state=started enabled=yes
+
+- name: Configure SELinux to allow httpd to connect to remote database
+  seboolean: name=httpd_can_network_connect_db state=true persistent=yes

lamp_simple_rhel7/roles/web/tasks/main.yml

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+---
+- include: install_httpd.yml
+- include: copy_code.yml

lamp_simple_rhel7/roles/web/templates/index.php.j2

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+<html>
+ <head>
+  <title>Ansible Application</title>
+ </head>
+ <body>
+ </br>
+  <a href=http://{{ ansible_default_ipv4.address }}/index.html>Homepage</a>
+ </br>
+<?php 
+ Print "Hello, World! I am a web server configured using Ansible and I am : ";
+ echo exec('hostname');
+ Print  "</BR>";
+echo  "List of Databases: </BR>";
+        {% for host in groups['dbservers'] %}
+                $link = mysqli_connect('{{ hostvars[host].ansible_default_ipv4.address }}', '{{ hostvars[host].dbuser }}', '{{ hostvars[host].upassword }}') or die(mysqli_connect_error($link));
+        {% endfor %}
+        $res = mysqli_query($link, "SHOW DATABASES;");
+        while ($row = mysqli_fetch_assoc($res)) {
+                echo $row['Database'] . "\n";
+        }
+?>
+</body>
+</html>
+

lamp_simple_rhel7/site.yml

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+---
+# This playbook deploys the whole application stack in this site.  
+
+- name: apply common configuration to all nodes
+  hosts: all
+  remote_user: root
+
+  roles:
+    - common
+
+- name: configure and deploy the webservers and application code
+  hosts: webservers
+  remote_user: root
+
+  roles:
+    - web
+
+- name: deploy MySQL and configure the databases
+  hosts: dbservers
+  remote_user: root
+
+  roles:
+    - db