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dig exits 0 on SERVFAIL and 9 when no resolver answers. A check that only greps for NXDOMAIN calls both fine. Mine said OK to 41 of 41 hosts. https://dev.to/posting-dude/my-dns-check-script-said-ok-f
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Source:https://dev.to/posting-dude/dig-exits-0-on-servfail-and-9-when-no-resolver-answers-a-check-that-only-greps-for-nxdomain-calls-42c5
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