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corvax19/gist:4135359

Created November 23, 2012 12:15
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Simple DNS resolve monitor with email notification #singleliner
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gistfile1.txt
ping -q -i1 -c3 target 2>&1|awk '/unknown host/{system("mailx -s \""$4" DNS resolution failed on `uname -n` at `date`\" bill.gates@microsoft.com >/dev/null")} /[:alpha:]/{S=S" "$0} END {print S}'
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Things to adjust:
target - put your hostname of interest here;
-i10 - pinging interval in seconds;
-c30 - pinging counter;
bill.gates@microsoft.com - your email here, as Bill could be unresponsive on such notifications.

Put it on cron. With -i10 and -c30 - schedule it for each 5 minutes (5min = 300 sec = 10 * 30)

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