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Directory :  /usr/lib64/nagios/plugins/base/

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Current File : /usr/lib64/nagios/plugins/base/check_resolvers
#!/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

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