Merge pull request #130 from cuongnv23/tomcat_failover_memcached

Initial commit for playbook tomcat-mecached-failover

22 files changed, 614 insertions, 0 deletions

diff --git a/tomcat-memcached-failover/LICENSE.md b/tomcat-memcached-failover/LICENSE.md
new file mode 100644
index 0000000..ed1a3b3
--- /dev/null
+++ b/tomcat-memcached-failover/LICENSE.md
@@ -0,0 +1,8 @@
+Copyright (c) 2015 Cuong Nguyen
+
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/tomcat-memcached-failover/README.md b/tomcat-memcached-failover/README.md
new file mode 100644
index 0000000..7ea1ec4
--- /dev/null
+++ b/tomcat-memcached-failover/README.md
@@ -0,0 +1,50 @@
+## Tomcat failover with Memcached + Memcached Session Manager + Nginx (load blancer)
+
+- Tested on Ansible 1.9.3 for Debian
+- Expects hosts: Centos 6.x
+
+This playbook deploys a failover solution for clustered Tomcat using Nginx as load balancer and Memcached + MSM as session manager.
+
+- Nginx: balances the requests by round robin.
+- Memcached: stores `sessionid` of tomcat.
+- MSM: manages tomcat session.
+
+For more detail about session management, see https://github.com/magro/memcached-session-manager
+
+This playbook also deploys a demo web app (https://github.com/magro/msm-sample-webapp) to test the session management.
+
+
+## Initial setup of inventory file
+
+```
+[lb_servers]
+lbserver
+
+[backend_servers]
+tomcat_server_1
+tomcat_server_2
+
+[memcached_servers]
+cached_server1
+cached_server2
+```
+
+Edit inventory file `hosts` to suit your requirements and run playbook:
+
+```
+    $ ansible-playbook -i host site.yml
+```
+
+When finished, open web browser and access to http://nginx_ip/ to start testing.
+
+## Ideas and improvements
+
+- Setup SSL for load balancer.
+- HA load balancer.
+- Hardening iptables rules.
+
+Pull requests are welcome.
+
+## License
+
+This work is licensed under MIT license.
diff --git a/tomcat-memcached-failover/group_vars/all b/tomcat-memcached-failover/group_vars/all
new file mode 100644
index 0000000..224bb55
--- /dev/null
+++ b/tomcat-memcached-failover/group_vars/all
@@ -0,0 +1,12 @@
+# Java variables
+
+# Nginx variables
+nginx_http_port: 80
+# nginx_https_port: 443
+
+# Tomcat variables
+tomcat_http_port: 8080
+tomcat_https_port: 8443
+
+# Memcached variables
+memcached_port: 11211
diff --git a/tomcat-memcached-failover/hosts b/tomcat-memcached-failover/hosts
new file mode 100644
index 0000000..e0cdf33
--- /dev/null
+++ b/tomcat-memcached-failover/hosts
@@ -0,0 +1,10 @@
+[lb_servers]
+lbserver
+
+[backend_servers]
+tomcat_server_1
+tomcat_server_2
+
+[memcached_servers]
+cached_server1
+cached_server2
diff --git a/tomcat-memcached-failover/roles/common/handlers/main.yml b/tomcat-memcached-failover/roles/common/handlers/main.yml
new file mode 100644
index 0000000..29856cc
--- /dev/null
+++ b/tomcat-memcached-failover/roles/common/handlers/main.yml
@@ -0,0 +1,3 @@
+---
+- name: restart iptables
+  service: name=iptables state=restarted
diff --git a/tomcat-memcached-failover/roles/common/tasks/main.yml b/tomcat-memcached-failover/roles/common/tasks/main.yml
new file mode 100644
index 0000000..8a0c8d5
--- /dev/null
+++ b/tomcat-memcached-failover/roles/common/tasks/main.yml
@@ -0,0 +1,13 @@
+---
+- name: Install libselinux-python
+  yum: name=libselinux-python state=present
+
+- name: Install GPG key for EPEL
+  get_url: url=https://dl.fedoraproject.org/pub/epel/RPM-GPG-KEY-EPEL-6 dest=/etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
+
+- name: Install EPEL repository
+  yum: name=https://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm state=present
+
+- name: Setup Iptables rules
+  template: src=iptables.j2 dest=/etc/sysconfig/iptables
+  notify: restart iptables
diff --git a/tomcat-memcached-failover/roles/common/templates/iptables.j2 b/tomcat-memcached-failover/roles/common/templates/iptables.j2
new file mode 100644
index 0000000..8ba5e73
--- /dev/null
+++ b/tomcat-memcached-failover/roles/common/templates/iptables.j2
@@ -0,0 +1,25 @@
+# {{ ansible_managed }}
+# Manual customization of this file is not recommended.
+*filter
+:INPUT ACCEPT [0:0]
+:FORWARD ACCEPT [0:0]
+:OUTPUT ACCEPT [0:0]
+
+{% if (inventory_hostname in groups['lb_servers']) %}
+-A INPUT -p tcp  --dport {{ nginx_http_port }} -j ACCEPT
+{% endif %}
+
+{% if inventory_hostname in groups['backend_servers'] %}
+-A INPUT -p tcp  --dport {{ tomcat_http_port }} -j  ACCEPT
+-A INPUT -p tcp  --dport {{ tomcat_https_port }} -j ACCEPT
+{% endif %}
+
+{% if inventory_hostname in groups['memcached_servers'] %}
+-A INPUT -p tcp  --dport {{ memcached_port }} -j  ACCEPT
+{% endif %}
+
+-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
+-A INPUT -p icmp -j ACCEPT
+-A INPUT -i lo -j ACCEPT
+-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
+COMMIT
diff --git a/tomcat-memcached-failover/roles/lb-nginx/handlers/main.yml b/tomcat-memcached-failover/roles/lb-nginx/handlers/main.yml
new file mode 100644
index 0000000..92971d2
--- /dev/null
+++ b/tomcat-memcached-failover/roles/lb-nginx/handlers/main.yml
@@ -0,0 +1,3 @@
+---
+- name: restart nginx
+  service: name=nginx state=restarted
diff --git a/tomcat-memcached-failover/roles/lb-nginx/tasks/main.yml b/tomcat-memcached-failover/roles/lb-nginx/tasks/main.yml
new file mode 100644
index 0000000..6a9c935
--- /dev/null
+++ b/tomcat-memcached-failover/roles/lb-nginx/tasks/main.yml
@@ -0,0 +1,14 @@
+---
+  - name: Install nginx
+    yum: name=nginx state=present
+
+  - name: Deliver main configuration file
+    template: src=nginx.conf.j2 dest=/etc/nginx/nginx.conf
+    notify: restart nginx
+
+  - name: Copy configuration file to nginx/sites-avaiable
+    template: src=default.conf.j2 dest=/etc/nginx/conf.d/default.conf
+    notify: restart nginx
+
+  - name: Make sure nginx start with boot
+    service: name=nginx state=started enabled=yes
diff --git a/tomcat-memcached-failover/roles/lb-nginx/templates/default.conf.j2 b/tomcat-memcached-failover/roles/lb-nginx/templates/default.conf.j2
new file mode 100644
index 0000000..d867af8
--- /dev/null
+++ b/tomcat-memcached-failover/roles/lb-nginx/templates/default.conf.j2
@@ -0,0 +1,16 @@
+upstream tomcat  {
+{% for host in groups['backend_servers'] %}
+      server {{ host }}:{{ tomcat_http_port }};
+{% endfor %}
+}
+
+server {
+    listen       80 default_server;
+    server_name  {{ inventory_hostname }};
+    include /etc/nginx/default.d/*.conf;
+
+    location / {
+      proxy_pass http://tomcat;
+    }
+
+}
diff --git a/tomcat-memcached-failover/roles/lb-nginx/templates/nginx.conf.j2 b/tomcat-memcached-failover/roles/lb-nginx/templates/nginx.conf.j2
new file mode 100644
index 0000000..cbede51
--- /dev/null
+++ b/tomcat-memcached-failover/roles/lb-nginx/templates/nginx.conf.j2
@@ -0,0 +1,42 @@
+# For more information on configuration, see:
+#   * Official English Documentation: http://nginx.org/en/docs/
+#   * Official Russian Documentation: http://nginx.org/ru/docs/
+
+user              nginx;
+worker_processes  1;
+
+error_log  /var/log/nginx/error.log;
+#error_log  /var/log/nginx/error.log  notice;
+#error_log  /var/log/nginx/error.log  info;
+
+pid        /var/run/nginx.pid;
+
+
+events {
+    worker_connections  1024;
+}
+
+
+http {
+    include       /etc/nginx/mime.types;
+    default_type  application/octet-stream;
+
+    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
+                      '$status $body_bytes_sent "$http_referer" '
+                      '"$http_user_agent" "$http_x_forwarded_for"';
+
+    access_log  /var/log/nginx/access.log  main;
+
+    sendfile        on;
+    #tcp_nopush     on;
+
+    #keepalive_timeout  0;
+    keepalive_timeout  65;
+
+    #gzip  on;
+
+    # Load config files from the /etc/nginx/conf.d directory
+    # The default server is in conf.d/default.conf
+    include /etc/nginx/conf.d/*.conf;
+
+}
diff --git a/tomcat-memcached-failover/roles/memcached/handlers/main.yml b/tomcat-memcached-failover/roles/memcached/handlers/main.yml
new file mode 100644
index 0000000..9aaea02
--- /dev/null
+++ b/tomcat-memcached-failover/roles/memcached/handlers/main.yml
@@ -0,0 +1,3 @@
+---
+- name: restart memcached
+  service: name=memcached state=restarted
diff --git a/tomcat-memcached-failover/roles/memcached/tasks/main.yml b/tomcat-memcached-failover/roles/memcached/tasks/main.yml
new file mode 100644
index 0000000..7502de6
--- /dev/null
+++ b/tomcat-memcached-failover/roles/memcached/tasks/main.yml
@@ -0,0 +1,14 @@
+---
+- name: Install memcached
+  yum: name=memcached state=present
+
+- name: Deliver configuration file
+  template: src=memcached.conf.j2 dest=/etc/sysconfig/memcached backup=yes
+  notify: restart memcached
+
+- name: Deliver init script
+  template: src=init.sh.j2 dest=/etc/init.d/memcached mode=0755
+  notify: restart memcached
+
+- name: Start memcached service
+  service: name=memcached state=started enabled=yes
diff --git a/tomcat-memcached-failover/roles/memcached/templates/init.sh.j2 b/tomcat-memcached-failover/roles/memcached/templates/init.sh.j2
new file mode 100644
index 0000000..a9b07c4
--- /dev/null
+++ b/tomcat-memcached-failover/roles/memcached/templates/init.sh.j2
@@ -0,0 +1,91 @@
+#! /bin/sh
+#
+# chkconfig: - 55 45
+# description:	The memcached daemon is a network memory cache service.
+# processname: memcached
+# config: /etc/sysconfig/memcached
+# pidfile: /var/run/memcached/memcached.pid
+
+# Standard LSB functions
+#. /lib/lsb/init-functions
+
+# Source function library.
+. /etc/init.d/functions
+
+PORT=11211
+USER=memcached
+MAXCONN=1024
+CACHESIZE=64
+OPTIONS=""
+
+if [ -f /etc/sysconfig/memcached ];then
+	. /etc/sysconfig/memcached
+fi
+
+# Check that networking is up.
+. /etc/sysconfig/network
+
+if [ "$NETWORKING" = "no" ]
+then
+	exit 0
+fi
+
+RETVAL=0
+prog="memcached"
+pidfile=${PIDFILE-/var/run/memcached/memcached.pid}
+lockfile=${LOCKFILE-/var/lock/subsys/memcached}
+
+start () {
+	echo -n $"Starting $prog: "
+	# Ensure that /var/run/memcached has proper permissions
+	if [ "`stat -c %U /var/run/memcached`" != "$USER" ]; then
+		chown $USER /var/run/memcached
+	fi
+
+#	daemon --pidfile ${pidfile} memcached -d -p $PORT -u $USER  -m $CACHESIZE -c $MAXCONN -P ${pidfile} $OPTIONS 
+daemon --pidfile ${pidfile} memcached -d -p $PORT -u $USER  -m $CACHESIZE -c $MAXCONN -P ${pidfile} $OPTIONS -vv > $LOGFILE 2>&1
+	RETVAL=$?
+	echo
+	[ $RETVAL -eq 0 ] && touch ${lockfile}
+}
+stop () {
+	echo -n $"Stopping $prog: "
+	killproc -p ${pidfile} /usr/bin/memcached
+	RETVAL=$?
+	echo
+	if [ $RETVAL -eq 0 ] ; then
+		rm -f ${lockfile} ${pidfile}
+	fi
+}
+
+restart () {
+        stop
+        start
+}
+
+
+# See how we were called.
+case "$1" in
+  start)
+	start
+	;;
+  stop)
+	stop
+	;;
+  status)
+	status -p ${pidfile} memcached
+	RETVAL=$?
+	;;
+  restart|reload|force-reload)
+	restart
+	;;
+  condrestart|try-restart)
+	[ -f ${lockfile} ] && restart || :
+	;;
+  *)
+	echo $"Usage: $0 {start|stop|status|restart|reload|force-reload|condrestart|try-restart}"
+	RETVAL=2
+        ;;
+esac
+
+exit $RETVAL
diff --git a/tomcat-memcached-failover/roles/memcached/templates/memcached.conf.j2 b/tomcat-memcached-failover/roles/memcached/templates/memcached.conf.j2
new file mode 100644
index 0000000..0924b65
--- /dev/null
+++ b/tomcat-memcached-failover/roles/memcached/templates/memcached.conf.j2
@@ -0,0 +1,17 @@
+# Running on Port 11211
+PORT="{{ memcached_port }}"
+
+# Start as memcached daemon
+USER="memcached"
+
+# Set max simultaneous connections to 1024
+MAXCONN="1024"
+
+# Set log file
+LOGFILE="/var/log/memcached.log"
+
+# Set Memory size to half of all memory
+CACHESIZE="{{ ansible_memtotal_mb / 2 }}"
+
+#Set server IP address
+OPTIONS="-l {{ ansible_default_ipv4['address'] }}"
diff --git a/tomcat-memcached-failover/roles/tomcat/files/msm-sample-webapp-1.0-SNAPSHOT.war b/tomcat-memcached-failover/roles/tomcat/files/msm-sample-webapp-1.0-SNAPSHOT.war
new file mode 100644
index 0000000..4ab5c03
--- /dev/null
+++ b/tomcat-memcached-failover/roles/tomcat/files/msm-sample-webapp-1.0-SNAPSHOT.war
diff --git a/tomcat-memcached-failover/roles/tomcat/handlers/main.yml b/tomcat-memcached-failover/roles/tomcat/handlers/main.yml
new file mode 100644
index 0000000..c6c4a35
--- /dev/null
+++ b/tomcat-memcached-failover/roles/tomcat/handlers/main.yml
@@ -0,0 +1,3 @@
+---
+- name: restart tomcat
+  service: name=tomcat state=restarted
diff --git a/tomcat-memcached-failover/roles/tomcat/tasks/main.yml b/tomcat-memcached-failover/roles/tomcat/tasks/main.yml
new file mode 100644
index 0000000..bae4ee6
--- /dev/null
+++ b/tomcat-memcached-failover/roles/tomcat/tasks/main.yml
@@ -0,0 +1,27 @@
+---
+  - name: Install OpenJDK
+    yum: name=java-1.7.0-openjdk state=present
+
+  - name: Install Tomcat
+    yum: name=tomcat state=present
+
+  - name: Deliver configuration files for tomcat
+    template: src={{ item.src }} dest={{ item.dest }} backup=yes
+    with_items:
+      - { src: 'default.j2', dest: '/etc/tomcat/default' }
+      - { src: 'server.xml.j2', dest: '/etc/tomcat/server.xml' }
+      - { src: 'context.xml.j2', dest: '/etc/tomcat/context.xml' }
+    notify: restart tomcat
+
+  - name: Deliver libraries support memcached
+    get_url: url="{{ item }}" dest=/usr/share/tomcat/lib/
+    with_items:
+      - http://repo1.maven.org/maven2/de/javakaffee/msm/memcached-session-manager/1.8.0/memcached-session-manager-1.8.0.jar
+      - http://repo1.maven.org/maven2/de/javakaffee/msm/memcached-session-manager-tc7/1.8.0/memcached-session-manager-tc7-1.8.0.jar
+      - https://spymemcached.googlecode.com/files/spymemcached-2.10.2.jar
+
+  - name: Deploy sample app
+    copy: src=msm-sample-webapp-1.0-SNAPSHOT.war dest=/var/lib/tomcat/webapps/ROOT.war owner=tomcat group=tomcat
+
+  - name: Start tomcat service
+    service: name=tomcat state=started enabled=yes
diff --git a/tomcat-memcached-failover/roles/tomcat/templates/context.xml.j2 b/tomcat-memcached-failover/roles/tomcat/templates/context.xml.j2
new file mode 100644
index 0000000..1f1507b
--- /dev/null
+++ b/tomcat-memcached-failover/roles/tomcat/templates/context.xml.j2
@@ -0,0 +1,41 @@
+<?xml version='1.0' encoding='utf-8'?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+-->
+<!-- The contents of this file will be loaded for each web application -->
+<Context>
+
+    <!-- Default set of monitored resources -->
+    <WatchedResource>WEB-INF/web.xml</WatchedResource>
+
+    <!-- Uncomment this to disable session persistence across Tomcat restarts -->
+    <!--
+    <Manager pathname="" />
+    -->
+    <Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"
+             memcachedNodes="{% for host in groups['memcached_servers'] %}n{{ loop.index }}:{{ host }}:{{ memcached_port }}{% if not loop.last %},{% endif %}{% endfor %}"
+             sticky="false"
+             sessionBackupAsync="false"
+             lockingMode="none"
+             requestUriIgnorePattern=".*\.(ico|png|gif|jpg|css|js)$"
+    />
+    <!-- Uncomment this to enable Comet connection tacking (provides events
+         on session expiration as well as webapp lifecycle) -->
+    <!--
+    <Valve className="org.apache.catalina.valves.CometConnectionManagerValve" />
+    -->
+
+</Context>
diff --git a/tomcat-memcached-failover/roles/tomcat/templates/default.j2 b/tomcat-memcached-failover/roles/tomcat/templates/default.j2
new file mode 100644
index 0000000..13e63b9
--- /dev/null
+++ b/tomcat-memcached-failover/roles/tomcat/templates/default.j2
@@ -0,0 +1,55 @@
+# Service-specific configuration file for tomcat. This will be sourced by
+# the SysV init script after the global configuration file
+# /etc/tomcat/tomcat.conf, thus allowing values to be overridden in
+# a per-service manner.
+#
+# NEVER change the init script itself. To change values for all services make
+# your changes in /etc/tomcat/tomcat.conf
+#
+# To change values for a specific service make your edits here.
+# To create a new service create a link from /etc/init.d/<your new service> to
+# /etc/init.d/tomcat (do not copy the init script) and make a copy of the
+# /etc/sysconfig/tomcat file to /etc/sysconfig/<your new service> and change
+# the property values so the two services won't conflict. Register the new
+# service in the system as usual (see chkconfig and similars).
+#
+
+# Where your java installation lives
+#JAVA_HOME="/usr/lib/jvm/java"
+
+# Where your tomcat installation lives
+#CATALINA_BASE="/usr/share/tomcat"
+#CATALINA_HOME="/usr/share/tomcat"
+#JASPER_HOME="/usr/share/tomcat"
+#CATALINA_TMPDIR="/var/cache/tomcat/temp"
+
+# You can pass some parameters to java here if you wish to
+#JAVA_OPTS="-Xminf0.1 -Xmaxf0.3"
+
+# Use JAVA_OPTS to set java.library.path for libtcnative.so
+#JAVA_OPTS="-Djava.library.path=/usr/lib"
+
+# What user should run tomcat
+#TOMCAT_USER="tomcat"
+
+# You can change your tomcat locale here
+#LANG="en_US"
+
+# Run tomcat under the Java Security Manager
+#SECURITY_MANAGER="false"
+
+# Time to wait in seconds, before killing process
+#SHUTDOWN_WAIT="30"
+
+# Whether to annoy the user with "attempting to shut down" messages or not
+#SHUTDOWN_VERBOSE="false"
+
+# Set the TOMCAT_PID location
+#CATALINA_PID="/var/run/tomcat.pid"
+
+# Connector port is 8080 for this tomcat instance
+#CONNECTOR_PORT="8080"
+
+# If you wish to further customize your tomcat environment,
+# put your own definitions here
+# (i.e. LD_LIBRARY_PATH for some jdbc drivers)
diff --git a/tomcat-memcached-failover/roles/tomcat/templates/server.xml.j2 b/tomcat-memcached-failover/roles/tomcat/templates/server.xml.j2
new file mode 100644
index 0000000..449436e
--- /dev/null
+++ b/tomcat-memcached-failover/roles/tomcat/templates/server.xml.j2
@@ -0,0 +1,147 @@
+<?xml version='1.0' encoding='utf-8'?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+-->
+<!-- Note:  A "Server" is not itself a "Container", so you may not
+     define subcomponents such as "Valves" at this level.
+     Documentation at /docs/config/server.html
+ -->
+<Server port="8005" shutdown="SHUTDOWN">
+  <!-- Security listener. Documentation at /docs/config/listeners.html
+  <Listener className="org.apache.catalina.security.SecurityListener" />
+  -->
+  <!--APR library loader. Documentation at /docs/apr.html -->
+  <!--
+  <Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on" />
+  -->
+  <!--Initialize Jasper prior to webapps are loaded. Documentation at /docs/jasper-howto.html -->
+  <Listener className="org.apache.catalina.core.JasperListener" />
+  <!-- Prevent memory leaks due to use of particular java/javax APIs-->
+  <Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener" />
+  <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
+  <Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener" />
+
+  <!-- Global JNDI resources
+       Documentation at /docs/jndi-resources-howto.html
+  -->
+  <GlobalNamingResources>
+    <!-- Editable user database that can also be used by
+         UserDatabaseRealm to authenticate users
+    -->
+    <Resource name="UserDatabase" auth="Container"
+              type="org.apache.catalina.UserDatabase"
+              description="User database that can be updated and saved"
+              factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
+              pathname="conf/tomcat-users.xml" />
+  </GlobalNamingResources>
+
+  <!-- A "Service" is a collection of one or more "Connectors" that share
+       a single "Container" Note:  A "Service" is not itself a "Container",
+       so you may not define subcomponents such as "Valves" at this level.
+       Documentation at /docs/config/service.html
+   -->
+  <Service name="Catalina">
+
+    <!--The connectors can use a shared executor, you can define one or more named thread pools-->
+    <!--
+    <Executor name="tomcatThreadPool" namePrefix="catalina-exec-"
+        maxThreads="150" minSpareThreads="4"/>
+    -->
+
+
+    <!-- A "Connector" represents an endpoint by which requests are received
+         and responses are returned. Documentation at :
+         Java HTTP Connector: /docs/config/http.html (blocking & non-blocking)
+         Java AJP  Connector: /docs/config/ajp.html
+         APR (HTTP/AJP) Connector: /docs/apr.html
+         Define a non-SSL HTTP/1.1 Connector on port 8080
+    -->
+    <Connector port="{{ tomcat_http_port }}" protocol="HTTP/1.1"
+               connectionTimeout="20000"
+               URIEncoding="UTF-8"
+               redirectPort="8443" />
+    <!-- A "Connector" using the shared thread pool-->
+    <!--
+    <Connector executor="tomcatThreadPool"
+               port="8080" protocol="HTTP/1.1"
+               connectionTimeout="20000"
+               redirectPort="8443" />
+    -->
+    <!-- Define a SSL HTTP/1.1 Connector on port 8443
+         This connector uses the JSSE configuration, when using APR, the
+         connector should be using the OpenSSL style configuration
+         described in the APR documentation -->
+    <!--
+    <Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true"
+               maxThreads="150" scheme="https" secure="true"
+               clientAuth="false" sslProtocol="TLS" />
+    -->
+
+    <!-- Define an AJP 1.3 Connector on port 8009 -->
+    <!--
+    <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />
+    -->
+
+
+    <!-- An Engine represents the entry point (within Catalina) that processes
+         every request.  The Engine implementation for Tomcat stand alone
+         analyzes the HTTP headers included with the request, and passes them
+         on to the appropriate Host (virtual host).
+         Documentation at /docs/config/engine.html -->
+
+    <!-- You should set jvmRoute to support load-balancing via AJP ie :
+    <Engine name="Catalina" defaultHost="localhost" jvmRoute="jvm1">
+    -->
+    <Engine name="Catalina" defaultHost="localhost">
+
+      <!--For clustering, please take a look at documentation at:
+          /docs/cluster-howto.html  (simple how to)
+          /docs/config/cluster.html (reference documentation) -->
+      <!--
+      <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>
+      -->
+
+      <!-- Use the LockOutRealm to prevent attempts to guess user passwords
+           via a brute-force attack -->
+      <Realm className="org.apache.catalina.realm.LockOutRealm">
+        <!-- This Realm uses the UserDatabase configured in the global JNDI
+             resources under the key "UserDatabase".  Any edits
+             that are performed against this UserDatabase are immediately
+             available for use by the Realm.  -->
+        <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
+               resourceName="UserDatabase"/>
+      </Realm>
+
+      <Host name="localhost"  appBase="webapps"
+            unpackWARs="true" autoDeploy="true">
+
+        <!-- SingleSignOn valve, share authentication between web applications
+             Documentation at: /docs/config/valve.html -->
+        <!--
+        <Valve className="org.apache.catalina.authenticator.SingleSignOn" />
+        -->
+
+        <!-- Access log processes all example.
+             Documentation at: /docs/config/valve.html
+             Note: The pattern used is equivalent to using pattern="common" -->
+        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
+               prefix="localhost_access_log." suffix=".txt"
+               pattern="%h %l %u %t &quot;%r&quot; %s %b" />
+
+      </Host>
+    </Engine>
+  </Service>
+</Server>
diff --git a/tomcat-memcached-failover/site.yml b/tomcat-memcached-failover/site.yml
new file mode 100644
index 0000000..718c199
--- /dev/null
+++ b/tomcat-memcached-failover/site.yml
@@ -0,0 +1,20 @@
+---
+- hosts: all
+  remote_user: root
+  roles:
+  - common
+
+- hosts: lb_servers
+  remote_user: root
+  roles:
+  - lb-nginx
+
+- hosts: backend_servers
+  remote_user: root
+  roles:
+  - tomcat
+
+- hosts: memcached_servers
+  remote_user: root
+  roles:
+  - memcached