#!/bin/bash
N=100
time for i in {1..$N}; do
  CID=$(docker run --name server-$i -d nginx)
  docker exec server-$i /bin/sh -c "echo I am number $i > /usr/share/nginx/html/index.html"
done
# Check every container once:
time for i in {1..$N}; do
  IP=$(docker inspect --format '{{.NetworkSettings.IPAddress}}' server-$i)
  curl http://${IP}/ &
done