howto.txt

1. Install rsyslogd, edit its config file (/etc/rsyslog.conf), add the following lines at the very bottom, then restart rsyslogd.
$ModLoad imudp $UDPServerAddress 127.0.0.1 $UDPServerRun 514

2. Add the following to /etc/rsyslog.d/haproxy.conf:
local6.*                                                /var/log/haproxy.log

3. Create the file /tmp/haproxy.conf and add the following lines to it:

global

   daemon

   nbproc 1

   maxconn 100000

   log 127.0.0.1 local6 debug

defaults

   option http-server-close

   mode http

   timeout http-request 5s

   timeout connect 5s

   timeout server 10s

   timeout client 10s

listen Hue 0.0.0.0:80

   log global

   mode http

   stats enable

   balance source

   server hue1 hue-ha-test1-1.ent.cloudera.com:8888 cookie ServerA check inter 2000 fall 3
   server hue2 hue-ha-test1-2.ent.cloudera.com:8888 cookie ServerB check inter 2000 fall 3

4. Download and gunzip HAProxy from here: http://haproxy.1wt.eu/download/1.4/bin/haproxy-1.4.24-pcre-40kses-linux-i586.stripped.gz.

5. Run ./haproxy-1.4.24-pcre-40kses-linux-i586.stripped -f /tmp/haproxy.conf

6. Goto localhost:7000 and see that Hue is running. Show /var/log/haproxy.log.

7. Go to http://hue-ha-test1-1.ent.cloudera.com:7180/ (admin:admin) and stop the Hue instance that you're on (probably will have to stop each instance to figure that out).

8. Go to Hue (it should be down once). Refresh and show Hue is back up. Show /var/log/haproxy.log.