Primarily my musings on the practical application of technology and management principles at a financial services company.
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| Modern Middle Manager Primarily my musings on the practical application of technology and management principles at a financial services company. |
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Still Working the Citrix Metaframe Angle
Friday, May 30, 2003 We recently put another long-unused feature of our Cisco Catalyst 6509 to use -- to create a Citrix Metaframe server farm using server load balancing in Cisco's IOS. Any Catalyst 6509 with the MSFC card can do this. The upside is that we didn't have to pay extra for the Metaframe XPa or XPe licenses to perform the load balancing, instead using cheaper XPs licenses and hiding the servers behind the switch. The trick is to make sure that the clients and the servers are on different subnets. After that, it's pretty easy. Below is our configuration: ! Create a NAT pool for clients -- simplifies routing. ip slb natpool CITRIX-CLIENTS 10.1.3.1 10.1.3.254 netmask 255.255.255.0 ! ! Line up the server farm. This declares which real servers will be part of the farm. ! Connections are distributed by a weighted least-connections algorithm after the first ! four connections are made to the server. The maximum number of connections allowed ! is 20. Note one service is set for "no inservice". We had to take it out of the farm ! because it was misbehaving. ! ip slb serverfarm CITRIXFARM nat server predictor leastconns nat client CITRIX-CLIENTS ! real 172.31.144.71 weight 4 maxconns 20 inservice ! real 172.31.144.72 weight 4 maxconns 20 inservice ! real 172.31.144.73 weight 4 maxconns 20 no inservice ! ! Create the virtual server. We used a subnet completely different from the clients & servers. ! ip slb vserver CITRIX virtual 172.31.145.79 tcp 0 serverfarm CITRIXFARM inservice ! ! The following command is necessary to get slb working. ! mls flow ip full The cool part is that by melding server load balancing with a blade server we can scale our farm very quickly. Got to remember to test each new server before unleashing it on the end-users, though... posted by Henry Jenkins | 5/30/2003 06:33:00 PM
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