# install haproxy
yum install haproxy


Configure Oozie HA as in 

Configure /etc/haproxy/conf/haproxy.cfg:

#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------
frontend  oozie
    bind *:11000
    mode http
    default_backend oozie_servers
    # acl url_static       path_beg       -i /static /images /javascript /stylesheets
    # acl url_static       path_end       -i .jpg .gif .png .css .js

    # use_backend static          if url_static
    # default_backend             app

#---------------------------------------------------------------------
# static backend for serving up images, stylesheets and such
#---------------------------------------------------------------------
backend static
    balance     roundrobin
    server      static 127.0.0.1:4331 check

#---------------------------------------------------------------------
# round robin balancing between the various backends
#---------------------------------------------------------------------
backend oozie_servers
    balance     roundrobin
    server  app1 oozie1.server.com:11000 check
    server  app2 oozie2.server.com:11000 check
    # server  app3 127.0.0.1:5003 check
    # server  app4 127.0.0.1:5004 check