linux/ypserv-closest.sh

   1 #!/bin/sh
   2 #
   3 # Author: Petter Reinholdtsen <pere@hungry.com>
   4 # Date:   2001-10-12
   5 # Name:   ypserv-closest.sh
   6 #
   7 # Fetch the list of NIS servers from NIS, and list the "closest"
   8 # servers (fastest reply) in yp.conf format.
   9 #
  10 # Uses 'ypcat' to find the servers, 'fping' to time the network
  11 # distance and normal shell tools to make the list.
  12
  13 domain=uio
  14 count=5
  15
  16 # fping is in /local/sbin/
  17 PATH="/local/sbin:$PATH"
  18 export PATH
  19
  20 # ypcat on OSF/1 prints 'key value'
  21 allservers=`ypcat ypservers | cut -d" " -f1`
  22
  23 # fping options:
  24 #  -a  = show targets by address
  25 #  -e  = show time elapsed
  26 # Example output:
  27 #  129.240.130.23 is alive (0.22 ms)
  28 #  129.240.130.21 is alive (0.23 ms)
  29 servers=`fping -A -e $allservers | awk '{print $4,$1}' | cut -d'(' -f2 |
  30   sort -n | head -$count | cut -d" " -f2`
  31
  32 for server in $servers; do
  33     echo "domain $domain server $server"
  34 done