Feel free to add this here:
http://wiki.apache.org/hadoop/topology_rack_awareness_scripts
On Thu, Nov 19, 2009 at 11:18 AM, Michael Thomas <tho...@hep.caltech.edu> wrote:
> Steve Loughran wrote:
>> Michael Thomas wrote:
>>> IPs are passed to the rack awareness script. We use 'dig' to do the
>>> reverse lookup to find the hostname, as we also embed the rack id in
>>> the worker node hostnames.
>>>
>>
>> It might be nice to have some example scripts up on the wiki, to give
>> people a good starting place
>
> If somebody with write access to the wiki would like to add it, here is
> the one we use on our Rocks cluster.
>
> --Mike
>
>
> #!/bin/sh
>
> # The default rule assumes that the nodes are connected to the PDU
> # and switch located in the same rack. Only the exceptions need
> # to be listed here.
>
> # In our Rocks cluster, nodes are named "compute-X-Y", where X is the
> # Rack identifier and Y is the vertical position of the node within
> # the rack.
>
> for ip in $@ ; do
> hostname=`nslookup $ip | grep "name =" | awk '{print $4}' | sed -e
> 's/\.local\.$//' `
> case $hostname in
> compute-5-8)
> # Exception: This node had to be rewired into
> # an adjacent rack
> rack="/Rack4"
> ;;
> *)
> rack=`echo $hostname | sed -e
> 's/^[a-z]*-\([0-9]*\)-[0-9]*.*/\/Rack\1/'`
> ;;
> esac
> echo $rack
> done
>
