Created
February 22, 2022 16:58
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DNS monitoring service as a bash one-liner
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| # dns servers, comma separated test query send email on failure email client notification addr | |
| echo -n "1.1.1.1,1.0.0.1" | xargs -d',' -I{} sh -c 'dig +timeout=5 @{} google.com | grep -q NOERROR || echo -e "To:me@smtp.local \nSubject:{} DNS server is unresponsive\n\nAs of $(date), {} is not responding to DNS queries for google.com." | /usr/sbin/sendmail me@smtp.local' |
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