Linux netstat Recipe

1. Create diag_netstat.sh:

   #!/bin/sh
   OUTPUTFILE="diag_netstat_$(hostname)_$(date +"%Y%m%d_%H%M%S").log"
   INTERVAL="${1:-30}" # First argument or a default of 30 seconds
   while true; do
     echo "diag: $(date +"%Y%m%d %H%M%S %N %Z") iteration" >> "${OUTPUTFILE}" 2>&1
     netstat -antop >> "${OUTPUTFILE}" 2>&1
     sleep ${INTERVAL}
   done

2. Make it executable:

   chmod +x diag_netstat.sh

3. Start it (default interval of 30 seconds or specify an alternate interval as the first argument):

   nohup ./diag_netstat.sh &

4. Reproduce the problem
   1. If at any point you need to reduce this disk usage of the output file during the test, truncate the file:

      cat /dev/null > diag_netstat*log

5. Stop the script:

   pkill -f diag_netstat

6. Upload diag_netstat_* and nohup.out

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