Initial add of haproxy example for fronting a number of radosgw's

roles/haproxy/files/precise/haproxy

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+# Set ENABLED to 1 if you want the init script to start haproxy.
+ENABLED=1
+# Add extra flags here.
+#EXTRAOPTS="-de -m 16"

roles/haproxy/handlers/main.yml

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+---
+## Check distribution release
+#
+
+- include: precise.yml
+  when: ansible_distribution == 'precise'

roles/haproxy/handlers/precise.yml

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+---
+- name: restart haproxy
+  service: name=haproxy state=restarted

roles/haproxy/tasks/main.yml

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+---
+## Check distribution release
+#
+
+- include: precise.yml
+  when: ansible_distribution == 'precise'

roles/haproxy/tasks/precise.yml

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+---
+- apt_repository: repo=ppa:vbernat/haproxy-1.5 state=present
+
+- apt: name={{item}} state=present
+  with_items:
+   - haproxy
+   - socat
+
+- copy: src=precise/haproxy dest=/etc/default/haproxy
+  notify: restart haproxy
+
+- template: src=precise/haproxy.cfg dest=/etc/haproxy/haproxy.cfg backup=yes
+  notify: restart haproxy
+
+- service: name=haproxy state=started enabled=yes

roles/haproxy/templates/precise/haproxy.cfg

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+#
+# {{ ansible_managed }}
+#
+global
+	log /dev/log	local0
+	log /dev/log	local1 notice
+	chroot /var/lib/haproxy
+	user haproxy
+	group haproxy
+    daemon
+    stats socket /var/lib/haproxy/stats level admin
+
+defaults
+	log	global
+    mode	http
+    option	httplog
+    option	dontlognull
+    contimeout 5000
+    clitimeout 50000
+    srvtimeout 50000
+	errorfile 400 /etc/haproxy/errors/400.http
+	errorfile 403 /etc/haproxy/errors/403.http
+	errorfile 408 /etc/haproxy/errors/408.http
+	errorfile 500 /etc/haproxy/errors/500.http
+	errorfile 502 /etc/haproxy/errors/502.http
+	errorfile 503 /etc/haproxy/errors/503.http
+	errorfile 504 /etc/haproxy/errors/504.http
+
+frontend http_frontend
+	bind *:80
+	mode http
+	option httpclose
+	option forwardfor
+	default_backend web_server
+
+frontend https_frontend
+	bind *:443 ssl crt /etc/ceph/radosgw-key-cert.pem
+	mode http
+	option httpclose
+	option forwardfor
+	reqadd X-Forwarded-Proto:\ https
+	default_backend web_server
+
+backend web_server
+	mode http
+	balance roundrobin
+	cookie RADOSGWLB insert indirect nocache
+{% for host in groups['rgws'] %}
+	server {{ hostvars[host].ansible_hostname }} {{ hostvars[host]['ansible_eth0'].ipv4.address }}:80 check cookie {{ hostvars[host].ansible_hostname }}
+{% endfor %}
+
+listen stats :8080
+    mode http
+    stats enable
+    stats hide-version
+    stats realm Haproxy\ Statistics
+    stats uri /
+#stats auth Username:Password