New role for installing and configuring haproxy

This can be useful for managing rabbitmq clusters and possibly
as a replacement for ELB.

playbooks/roles/haproxy/defaults/main.yml

+---
+#
+# edX Configuration
+#
+# github:     https://github.com/edx/configuration
+# wiki:       https://github.com/edx/configuration/wiki
+# code style: https://github.com/edx/configuration/wiki/Ansible-Coding-Conventions
+# license:    https://github.com/edx/configuration/blob/master/LICENSE.TXT
+#
+##
+# Defaults for role haproxy
+# 
+
+#
+# vars are namespace with the module name.
+#
+haproxy_role_name: haproxy
+
+#
+# OS packages
+#
+
+haproxy_debian_pkgs: []
+
+haproxy_redhat_pkgs: []
+
+pkgs:
+  haproxy:
+    state: installed
+
+haproxy_template_dir: .
+
+haproxy_extra_global_config: ''
+
+haproxy_default_config: |
+  log	global
+  mode	http
+  option	httplog
+  option	dontlognull
+  option redispatch
+  retries	3
+  maxconn	2000
+  contimeout	5000
+  clitimeout	50000
+  srvtimeout	50000
+
+# Sample rabbitmq load balance config
+# but this should likely get overidden with your
+# desired applications
+haproxy_applications:
+  - |
+    listen rabbitmq 127.0.0.1:5672
+    mode    tcp
+    balance roundrobin
+    option  tcplog
+    option  tcpka
+    server  rabbit01 172.23.128.10:5672 check inter 5000 rise 2 fall 3
+    server  rabbit02 172.23.129.10:5672 backup check inter 5000 rise 2 fall 3
+    server  rabbit03 172.23.130.10:5672 backup check inter 5000 rise 2 fall 3

playbooks/roles/haproxy/files/haproxy.logrotate

+/var/log/haproxy/*.log {
+		weekly
+		missingok
+		rotate 7
+		compress
+		delaycompress
+		notifempty
+		create 640 root adm
+		sharedscripts
+		postrotate
+		/etc/init.d/haproxy reload > /dev/null
+		endscript
+}

playbooks/roles/haproxy/files/haproxy.rsyslog

+if ($programname == 'haproxy' and $syslogseverity-text == 'info') then -/var/log/haproxy/haproxy-info.log
+& ~
+if ($programname == 'haproxy' and $syslogseverity-text == 'notice') then -/var/log/haproxy/haproxy-notice.log
+& ~

playbooks/roles/haproxy/handlers/main.yml

+---
+#
+# edX Configuration
+#
+# github:     https://github.com/edx/configuration
+# wiki:       https://github.com/edx/configuration/wiki
+# code style: https://github.com/edx/configuration/wiki/Ansible-Coding-Conventions
+# license:    https://github.com/edx/configuration/blob/master/LICENSE.TXT
+#
+#
+#
+# Handlers for role haproxy
+# 
+# Overview:
+# 
+#
+- name: haproxy | restart haproxy
+  service: name=haproxy state=restarted
+
+- name: haproxy | reload haproxy
+  service: name=haproxy state=reloaded
+
+- name: haproxy | restart rsyslog
+  service: name=rsyslog state=restarted

playbooks/roles/haproxy/meta/main.yml

+---
+#
+# edX Configuration
+#
+# github:     https://github.com/edx/configuration
+# wiki:       https://github.com/edx/configuration/wiki
+# code style: https://github.com/edx/configuration/wiki/Ansible-Coding-Conventions
+# license:    https://github.com/edx/configuration/blob/master/LICENSE.TXT
+#
+##
+# Role includes for role haproxy
+# 
+# Example:
+#
+# dependencies:
+#   - {
+#   role: my_role 
+#   my_role_var0: "foo"
+#   my_role_var1: "bar"
+# }

playbooks/roles/haproxy/tasks/main.yml

+---
+#
+# edX Configuration
+#
+# github:     https://github.com/edx/configuration
+# wiki:       https://github.com/edx/configuration/wiki
+# code style: https://github.com/edx/configuration/wiki/Ansible-Coding-Conventions
+# license:    https://github.com/edx/configuration/blob/master/LICENSE.TXT
+#
+#
+#
+# Tasks for role haproxy
+# 
+# Overview:
+# Installs and configures haproxy for load balancing.
+# HAProxy doesn't currently support included configuration
+# so it allows for a configuration template to be overriden
+# with a variable
+
+- name: haproxy | Install haproxy
+  apt: pkg=haproxy state={{ pkgs.haproxy.state }}
+  notify: haproxy | restart haproxy
+
+- name: haproxy | Server configuration file
+  template: >
+    src={{ haproxy_template_dir }}/haproxy.cfg.j2 dest=/etc/haproxy/haproxy.cfg
+    owner=root group=root mode=0644
+  notify: haproxy | reload haproxy
+
+- name: haproxy | Enabled in default
+  lineinfile: dest=/etc/default/haproxy regexp=^ENABLED=.$ line=ENABLED=1
+  notify: haproxy | restart haproxy
+
+- name: haproxy | install logrotate
+  copy: src=haproxy.logrotate dest=/etc/logrotate.d/haproxy mode=0644
+
+- name: haproxy | install rsyslog conf
+  copy: src=haproxy.rsyslog dest=/etc/rsyslog.d/haproxy.conf mode=0644
+  notify: haproxy | restart rsyslog
+
+- name: haproxy | make sure haproxy has started
+  service: name=haproxy state=started

playbooks/roles/haproxy/templates/haproxy.cfg.j2

+# this config needs haproxy-1.1.28 or haproxy-1.2.1
+
+global
+	log 127.0.0.1	local0
+	log 127.0.0.1	local1 notice
+	#log loghost	local0 info
+	maxconn 4096
+	#chroot /usr/share/haproxy
+	user haproxy
+	group haproxy
+	daemon
+	#debug
+	#quiet
+{{ haproxy_extra_global_config }}
+
+defaults
+{{ haproxy_default_config }}
+
+{%- for app in haproxy_applications -%}
+{{ app }}
+
+{%- endfor -%}