Monitor incoming connections of proxies and balancers.

watch -n 1 "/usr/sbin/lsof -p PID |awk '/TCP/{split(\$8,A,\":\"); split(A[2],B,\">\") ; split(B[1],C,\"-\"); print A[1],C[1],B[2], \$9}' | sort | uniq -c"
Maybe this will help you to monitor your load balancers or reverse proxies if you happen to use them. This is useful to discover TIME OUTS and this will let you know if one or more of your application servers is not connected by checking.
Sample Output
Every 1.0s: /usr/sbin/lsof -p 24685 |awk '/TCP/{split($8,A,":"); split(A[2],B,">") ; split(B[1],C,"-"); print A[1],C[1],B[2], $9}' | sort | uniq -c                                                Fri Aug 12 13:58:17 2011

      1 172.1.1.1 35735 10.60.10.30 (ESTABLISHED)
      1 172.1.1.1 54371 10.60.10.31 (ESTABLISHED)
      1 172.1.1.1 icl 10.6.20.30 (ESTABLISHED)
      2 172.1.1.1 icl appcc (ESTABLISHED)
      1 * icl  (LISTEN)

2
By: ideivid
2011-08-12 19:16:38

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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