Building Linux Terminal Service Cluster using LVS

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Configuration Example

The basic issue faced by me during LVS configuration using piranha was that Nanny could not monitor the service and would frequently give a READ TIME OUT.

The configuration otherwise was a standard LVS-NAT configuration in rr mode. Once the connection with a Terminal Server was established, there would be direct communication with the selected Terminal Server.

Environment ->

LVS-Piranha Server(s) -> RHEL 5 (2.6.18-8.el5) running piranha (2 in number) Real Servers -> RHEL 4 (2.6.9-42.ELSmp) acting as Terminal Servers (xdm->gdm)

To get around the Nanny read time out, issue ->

On the Real servers ->

a) Enable remote shell access by the LVS server(s)

                  For RHEL 4 -> install rsh-server rpm
                  edit /etc/securetty
                  enable rsh and rlogin
                  restart xinetd
                  create .rhosts file in the home folder of the user (in my case root) to allow remote access from                   LVS Server(s)

b) Create a small script in /usr/local/bin (let's say xdmstatus) ->

                  RESULT=`netstat -an | grep 177 | grep udp | awk '{ print $1 }'`
                  echo $RESULT

c) make this script executable (chmod a+x)

On the LVS Server(s) ->

modify /etc/sysconfig/ha/ to contain (please see snippet) ->

             send_program = "/usr/bin/rsh %h /usr/local/bin/xdmstatus"
             expect = "udp"


External Links

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