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Simple "One-liner" DNS-timing
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| #!/usr/bin/env bash | |
| # set -x | |
| ## | |
| ## DNS timing "one-liner" | |
| ## | |
| function _dns_timing() { | |
| local EMAIL='59766160@opayq.com' | |
| local HOSTS=( 'www.google.com' 'www.aol.com' 'www.reddit.com' 'netdna.bootstrapcdn.com' ) | |
| curl -s -o test-hosts.sh 'https://gist.githubusercontent.com/smj10j/b72547d71f06e8a242ff43ee683b4e71/raw/test-hosts.sh' | |
| echo "==================================================" >> test-hosts.log | |
| echo "============== $(date) ==============" >> test-hosts.log | |
| bash test-hosts.sh "${HOSTS[@]}" 2>&1 | tee -a test-hosts.log | |
| echo "==================================================" >> test-hosts.log | |
| mail -s "DNS timing results from $(curl ifconfig.me) via $(whoami)@$(hostname)" ${EMAIL} < test-hosts.log | |
| } | |
| export _dns_timing | |
| _dns_timing |
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| #!/bin/bash | |
| #set -x | |
| declare -a HOSTS | |
| declare -a TTLS | |
| declare -a TTL_SUMS | |
| HOSTS=("$@") | |
| TTLS=( ) | |
| TTL_SUMS=( 0 0 ) | |
| N=50 | |
| NUM_HOSTS=${#HOSTS[@]} | |
| function ttl() { | |
| #echo "$(host -r -a -t a $1)" | awk '/^'$1'/ {print $2}' | head -1 | |
| echo "$(host -a -t a $1)" | awk '/^'$1'/ {print $2}' | head -1 | |
| } | |
| function cleanup() { | |
| # echo "" | |
| # echo "TTLs:" | |
| # echo "${TTLS[@]}" | |
| # echo "TTL_SUMs:" | |
| # echo "${TTL_SUMS[@]}" | |
| # echo "HOSTs:" | |
| # echo "${HOSTS[@]}" | |
| echo "" | |
| LEN=$((${#TTLS[@]} / NUM_HOSTS)) | |
| FS=$'\t' | |
| INDEX=0; | |
| echo "HOST${FS}TTL SUM${FS}NUM SAMPLES${FS}TTL AVG" | |
| for host in ${HOSTS[@]}; do | |
| echo "${HOSTS[INDEX]}${FS}${TTL_SUMS[INDEX]}${FS}$LEN${FS}"$((${TTL_SUMS[INDEX]} / LEN)) | |
| INDEX=$((INDEX+1)) | |
| done | |
| } | |
| trap cleanup EXIT | |
| ITERATIONS=$((N*NUM_HOSTS)) | |
| echo "Iterations: $ITERATIONS" | |
| echo "Num Hosts: $NUM_HOSTS" | |
| for i in $(seq $ITERATIONS); do | |
| INDEX=$((i%NUM_HOSTS)) | |
| HOST=${HOSTS[INDEX]} | |
| DELAY=$(echo "$RANDOM*0.00005" | bc) | |
| echo "Sleeping for ${DELAY}s..." | |
| sleep $DELAY | |
| TTL=$(ttl $HOST) | |
| TTLS[$i]=$TTL | |
| TTL_SUMS[$INDEX]=$((${TTL_SUMS[INDEX]}+TTL)) | |
| echo "TTL to resolve $HOST: $TTL" | |
| done |
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