openstack-manuals/doc/high-availability-guide/ch_ha_aa_haproxy.xml

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        <title>HAProxy nodes</title>

      <para>HAProxy is a very fast and reliable solution offering high availability, load balancing, and proxying
for TCP and HTTP-based applications. It is particularly suited for web sites crawling under very high loads
while needing persistence or Layer 7 processing. Supporting tens of thousands of connections is clearly
realistic with today’s hardware.</para>
      <para>For installing HAProxy on your nodes, you should consider its <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://haproxy.1wt.eu/#docs">official documentation</link>.
Also, you have to consider that this service should not be a single point of failure, so you need at least two
nodes running HAProxy.</para>
      <para>Here is an example for HAProxy configuration file:</para>
      <programlisting>global
  chroot  /var/lib/haproxy
  daemon
  group  haproxy
  maxconn  4000
  pidfile  /var/run/haproxy.pid
  user  haproxy

defaults
  log  global
  maxconn  8000
  option  redispatch
  retries  3
  timeout  http-request 10s
  timeout  queue 1m
  timeout  connect 10s
  timeout  client 1m
  timeout  server 1m
  timeout  check 10s

listen dashboard_cluster
  bind &lt;Virtual IP&gt;:443
  balance  source
  option  tcpka
  option  httpchk
  option  tcplog
  server controller1 10.0.0.1:443 check inter 2000 rise 2 fall 5
  server controller2 10.0.0.2:443 check inter 2000 rise 2 fall 5

listen galera_cluster
  bind &lt;Virtual IP&gt;:3306
  balance  source
  option  httpchk
  server controller1 10.0.0.4:3306 check port 9200 inter 2000 rise 2 fall 5
  server controller2 10.0.0.5:3306 check port 9200 inter 2000 rise 2 fall 5
  server controller3 10.0.0.6:3306 check port 9200 inter 2000 rise 2 fall 5

listen glance_api_cluster
  bind &lt;Virtual IP&gt;:9292
  balance  source
  option  tcpka
  option  httpchk
  option  tcplog
  server controller1 10.0.0.1:9292 check inter 2000 rise 2 fall 5
  server controller2 10.0.0.2:9292 check inter 2000 rise 2 fall 5

listen glance_registry_cluster
  bind &lt;Virtual IP&gt;:9191
  balance  source
  option  tcpka
  option  tcplog
  server controller1 10.0.0.1:9191 check inter 2000 rise 2 fall 5
  server controller2 10.0.0.2:9191 check inter 2000 rise 2 fall 5

listen keystone_admin_cluster
  bind &lt;Virtual IP&gt;:35357
  balance  source
  option  tcpka
  option  httpchk
  option  tcplog
  server controller1 10.0.0.1:35357 check inter 2000 rise 2 fall 5
  server controller2 10.0.0.2.42:35357 check inter 2000 rise 2 fall 5

listen keystone_public_internal_cluster
  bind &lt;Virtual IP&gt;:5000
  balance  source
  option  tcpka
  option  httpchk
  option  tcplog
  server controller1 10.0.0.1:5000 check inter 2000 rise 2 fall 5
  server controller2 10.0.0.2:5000 check inter 2000 rise 2 fall 5

listen nova_ec2_api_cluster
  bind &lt;Virtual IP&gt;:8773
  balance  source
  option  tcpka
  option  tcplog
  server controller1 10.0.0.1:8773 check inter 2000 rise 2 fall 5
  server controller2 10.0.0.2:8773 check inter 2000 rise 2 fall 5

listen nova_compute_api_cluster
  bind &lt;Virtual IP&gt;:8774
  balance  source
  option  tcpka
  option  httpchk
  option  tcplog
  server controller1 10.0.0.1:8774 check inter 2000 rise 2 fall 5
  server controller2 10.0.0.2:8774 check inter 2000 rise 2 fall 5

listen nova_metadata_api_cluster
  bind &lt;Virtual IP&gt;:8775
  balance  source
  option  tcpka
  option  tcplog
  server controller1 10.0.0.1:8775 check inter 2000 rise 2 fall 5
  server controller2 10.0.0.2:8775 check inter 2000 rise 2 fall 5

listen cinder_api_cluster
  bind &lt;Virtual IP&gt;:8776
  balance  source
  option  tcpka
  option  httpchk
  option  tcplog
  server controller1 10.0.0.1:8776 check inter 2000 rise 2 fall 5
  server controller2 10.0.0.2:8776 check inter 2000 rise 2 fall 5

listen ceilometer_api_cluster
  bind &lt;Virtual IP&gt;:8777
  balance  source
  option  tcpka
  option  httpchk
  option  tcplog
  server controller1 10.0.0.1:8774 check inter 2000 rise 2 fall 5
  server controller2 10.0.0.2:8774 check inter 2000 rise 2 fall 5

listen spice_cluster
  bind &lt;Virtual IP&gt;:6082
  balance  source
  option  tcpka
  option  tcplog
  server controller1 10.0.0.1:6080 check inter 2000 rise 2 fall 5
  server controller2 10.0.0.2:6080 check inter 2000 rise 2 fall 5

listen neutron_api_cluster
  bind &lt;Virtual IP&gt;:9696
  balance  source
  option  tcpka
  option  httpchk
  option  tcplog
  server controller1 10.0.0.1:9696 check inter 2000 rise 2 fall 5
  server controller2 10.0.0.2:9696 check inter 2000 rise 2 fall 5

listen swift_proxy_cluster
  bind &lt;Virtual IP&gt;:8080
  balance  source
  option  tcplog
  option  tcpka
  server controller1 10.0.0.1:8080 check inter 2000 rise 2 fall 5
  server controller2 10.0.0.2:8080 check inter 2000 rise 2 fall 5</programlisting>
      <para>After each change of this file, you should restart HAProxy.</para>
    </chapter>