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.