Some various fixups and interface name handling.

- Add 'iface' group variable to specify the network interface on which the
  systems should listen.
- Add a couple of missing playbook inclusions
- Set up EPEL on all hosts for socat and haproxy

lamp_haproxy/group_vars/lbservers

@@ -1,16 +1,18 @@
 ---
 # File for the HAproxy configuration
 
-#Supports http and tcp, for ssl smtp etc.. use tcp
+# Supports http and tcp, for ssl smtp etc.. use tcp
 mode: http
 
-#port on which the lb should listen
+# port on which the lb should listen
 listenport: 8888
 
-#A name for the proxy daemon, this would be the suffix in the logs.
+# A name for the proxy daemon, this would be the suffix in the logs.
 daemonname: myapplb
 
-#Balancing Algorithm Avalilable options: roundrobin,source,leastconn,source,uri
-#If persistance is required use source
+# Balancing Algorithm Avalilable options: roundrobin,source,leastconn,source,uri
+# (if persistance is required use source)
 balance: roundrobin 
 
+# Which Ethernet interface on which the load balancer should listen
+iface: eth0

lamp_haproxy/group_vars/webservers

@@ -0,0 +1,5 @@
+---
+# File for the web server configuration
+
+# Which Ethernet interface on which the web server should listen
+iface: eth0

lamp_haproxy/playbooks/haproxy.yml

@@ -4,6 +4,7 @@
 - hosts: lbservers
   user: root
   tasks:
+   - include: ../roles/common/tasks/main.yml
    - include: ../roles/haproxy/tasks/main.yml
   handlers:
    - include: ../roles/haproxy/handlers/main.yml

lamp_haproxy/playbooks/web.yml

@@ -9,3 +9,4 @@
   - include: ../roles/web/tasks/copy_code.yml
   handlers:
    - include: ../roles/web/handlers/main.yml
+   - include: ../roles/common/handlers/main.yml

lamp_haproxy/roles/common/tasks/main.yml

@@ -14,5 +14,12 @@
   service: name=ntpd state=started enabled=true
   tags: ntp
 
+- name: Download the EPEL repository RPM
+  get_url: url=http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm dest=/tmp/ force=yes
 
- 
+- name: Install EPEL RPM
+#  command: rpm -Uvh --force /tmp/epel-release-6-8.noarch.rpm
+  yum: name=/tmp/epel-release-6-8.noarch.rpm state=installed
+
+- name: Clean up
+  command: rm -f /tmp/epel-release-6-8.noarch.rpm

lamp_haproxy/roles/haproxy/tasks/main.yml

@@ -1,14 +1,11 @@
 ---
 # This PlayBook Installs the HAProxy and configures it.
 
-- name: Download and install haproxy
-  command: creates=/opt/haproxy.rpm curl -o /opt/haproxy.rpm ftp://ftp.univie.ac.at/systems/linux/fedora/epel/6/i386/haproxy-1.4.18-1.el6.i686.rpm
-
-- name: Install the haproxy rpm.
-  command: creates=/etc/haproxy/haproxy.cfg yum -y localinstall  /opt/haproxy.rpm
-
-- name: Install the socat package for dynamic addition/removal of hosts
-  yum: name=socat state=installed
+- name: Download and install haproxy and socat
+  yum: name=$item state=installed
+  with_items:
+  - haproxy
+  - socat
 
 - name: Open firewall port for haproxy.
   lineinfile: dest=/etc/sysconfig/iptables state=present regexp="$listenport" insertafter="^:OUTPUT " line="-A INPUT -p tcp  --dport $listenport -j  ACCEPT"

lamp_haproxy/roles/haproxy/templates/haproxy.cfg.j2

@@ -31,9 +31,9 @@ defaults
 
 backend app
     {% for host in groups['lbservers'] %}
-    	listen {{ daemonname }} {{ hostvars[host].ansible_eth0.ipv4.address }}:{{ listenport }}
+    	listen {{ daemonname }} {{ hostvars[host]['ansible_' + iface].ipv4.address }}:{{ listenport }}
     {% endfor %}
     balance     {{ balance }}
     {% for host in groups['webservers'] %}
-        server {{ hostvars[host].ansible_hostname }} {{ hostvars[host].ansible_eth0.ipv4.address }}:{{ httpd_port }}
+        server {{ hostvars[host].ansible_hostname }} {{ hostvars[host]['ansible_' + iface].ipv4.address }}:{{ httpd_port }}
     {% endfor %}

lamp_haproxy/roles/web/tasks/add_to_lb.yml

@@ -2,7 +2,7 @@
 # This Playbook does utility stuff's like adding a webserver into the pool, etc..
 
 - name: Add server to LB
-  lineinfile: dest=/etc/haproxy/haproxy.cfg state=present regexp="${ansible_hostname}" line="server ${ansible_hostname} ${ansible_eth0.ipv4.address}:${httpd_port}"
+  lineinfile: dest=/etc/haproxy/haproxy.cfg state=present regexp="${ansible_hostname}" line="server ${ansible_hostname} ${hostvars.{$inventory_hostname}.ansible_$iface.ipv4.address}:${httpd_port}"
   delegate_to: $item
   with_items: ${groups.lbservers}  
   register: last_run

lamp_haproxy/roles/web/tasks/utils.yml

@@ -2,7 +2,7 @@
 # This Playbook does utility stuff's like adding a webserver into the pool, etc..
 
 - name: Add server to LB
-  lineinfile: dest=/etc/haproxy/haproxy.cfg state=present regexp="${ansible_hostname}" line="server ${ansible_hostname} ${ansible_eth0.ipv4.address}:${httpd_port}"
+  lineinfile: dest=/etc/haproxy/haproxy.cfg state=present regexp="${ansible_hostname}" line="server ${ansible_hostname} ${hostvars.{$inventory_hostname}.ansible_$iface.ipv4.address}:${httpd_port}"
   delegate_to: ${lbserver}
   register: last_run
   tags: add

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

@@ -4,7 +4,7 @@
  </head>
  <body>
  </br>
-  <a href=http://{{ ansible_eth0.ipv4.address }}/index.html>Homepage</a>
+  <a href=http://{{ hostvars[ansible_hostname]['ansible_' + iface].ipv4.address }}/index.html>Homepage</a>
  </br>
 <?php 
  Print "Hello, World! I am configured in Ansible and i am : ";