Pings all AWS regions and sorts by RTT.

aws-ping.sh

#!/bin/bash

# Usage: `./aws-ping.sh` prints all regions sorted by lowest latency and `./aws-ping.sh 3` prints the top 3 regions.

declare -A zones=(
  [us-east-2]="US East (Ohio)"
  [us-east-1]="US East (N. Virginia)"
  [us-west-1]="US West (N. California)"
  [us-west-2]="US West (Oregon)"
  [af-south-1]="Africa (Cape Town)"
  [ap-east-1]="Asia Pacific (Hong Kong)"
  [ap-south-1]="Asia Pacific (Mumbai)"
  [ap-northeast-3]="Asia Pacific (Osaka-Local)"
  [ap-northeast-2]="Asia Pacific (Seoul)"
  [ap-southeast-1]="Asia Pacific (Singapore)"
  [ap-southeast-2]="Asia Pacific (Sydney)"
  [ap-northeast-1]="Asia Pacific (Tokyo)"
  [ca-central-1]="Canada (Central)"
  [eu-central-1]="Europe (Frankfurt)"
  [eu-west-1]="Europe (Ireland)"
  [eu-west-2]="Europe (London)"
  [eu-south-1]="Europe (Milan)"
  [eu-west-3]="Europe (Paris)"
  [eu-north-1]="Europe (Stockholm)"
  [me-south-1]="Middle East (Bahrain)"
  [sa-east-1]="South America (São Paulo)"
)

file=`mktemp`

for zone in "${!zones[@]}"; do
  name=${zones[$zone]}
  rtt=`ping -qc1 dynamodb.$zone.amazonaws.com 2>&1 | awk -F'/' 'END{ print (/^rtt/? $5:"FAIL") }'`
  echo "$rtt ms: $zone [$name]" >> $file
done

if [ -n "$1" ]; then
  sort -n $file | head -$1
else
  sort -n $file
fi