https://clement.n8r.ch/en/tags/go/ Recent content in Go on n8r | Clément Hugo -- 0.147.7 en-US Mon, 31 Jul 2023 16:23:32 +0100 https://clement.n8r.ch/en/articles/dns-servers-monitoring/ Mon, 31 Jul 2023 16:23:32 +0100 https://clement.n8r.ch/en/articles/dns-servers-monitoring/ <p>A few months ago, I found myself needing to know about the reliability of some internal DNS provider&rsquo;s servers, after getting a series of hardly trackable random network issues, aka &ldquo;It&rsquo;s always DNS&rdquo;.</p> <p><img alt="Always DNS meme" loading="lazy" src="https://i.redd.it/qlbz5kaucva51.jpg"></p> <p>More specifically, I needed to know about the following:</p> <ul> <li> <p>number of errors/timeouts</p> </li> <li> <p>capability to query over TCP or UDP</p> </li> <li> <p>capability to monitor multiple DNS servers at once</p> </li> <li> <p>return codes received in the answer (i.e. <code>NOERROR</code>, <code>SERVFAIL</code>, <code>NXDOMAIN</code>, you name it)</p>