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#!/bin/bash
exit_code=0
resolvers=$(cat /etc/resolv.conf | grep -i "^nameserver" | awk '{print $2}')
if [[ -z $resolvers ]]; then
echo -n 'UNKNOWN - No resolvers set up in resolv.conf'
exit 3
fi
if [[ ! -z $(host google.com 2>/dev/null | grep 'connection timed out') ]]; then
echo -n 'CRITICAL - No resolvers could be reached'
exit 2
fi
for res in $resolvers; do
host=`dig @$res google.com +short 2>/dev/null | grep 'connection timed out'`
if [[ ! -z $host ]]; then
result+=$(echo -e "WARNING - Resolver $res is unreachable \n")
exit_code=1
else
result+=$(echo -e "Resolver $res is ok \n")
fi
done
echo $result
exit $exit_code