Technical Musings: November 2014

Friday, November 21, 2014

Number of New Connection Per Second

Under pressure, debuging a production system, given the following question:

"How many new connections per second are we creating to S3?".

My one-liner (Linux):

while true; do diff   <(netstat -an | grep ESTAB | grep ":443 "| grep -v "N.N.N.N:443 " | sort) <(sleep 1; netstat -an | grep ESTAB | grep ":443 "| grep -v "N.N.N.N:443 " | sort) | grep "<" | wc -l;sleep 1;done

Where N.N.N.N is the local IP.  Many better ways to do this, but I had this in a few minutes.