Initial commit for playbook tomcat-mecached-failover

Author: cuongnv23

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.

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.

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

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

tomcat-memcached-failover/roles/common/handlers/main.yml

@@ -0,0 +1,3 @@
+---
+- name: restart iptables
+  service: name=iptables state=restarted

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

tomcat-memcached-failover/roles/common/templates/iptables.j2

@@ -0,0 +1,26 @@
+# {{ 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
+-A INPUT -p tcp  --dport {{ nginx_https_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

tomcat-memcached-failover/roles/lb-nginx/handlers/main.yml

@@ -0,0 +1,3 @@
+---
+- name: restart nginx
+  service: name=nginx state=restarted

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

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;
+    }
+
+}