<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div><blockquote type="cite" class=""><div class="">On 24. 8. 2022, at 11:01, hamid <<a href="mailto:hamid@dexo.tech" class="">hamid@dexo.tech</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta charset="UTF-8" class=""><div dir="auto" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">> Perhaps, describing the use case first (why do you want to use MongoDB at all) might have the benefit of not wasting time on your end.</div><div dir="auto" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br class=""></div><div dir="auto" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">Forgot to answer this, my use case would be the same as someone who uses a SQL DB backend I imagine: to be able to configure multiple BIND endpoints, using the same backend DB instead of configuration files, so there is no need to worry about change propagation and use of configuration management tools like chef, ansible etc.</div><div dir="auto" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">I just prefer to use no-sql backends like MongoDB, or Amazon's DocumentDB.</div><div dir="auto" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br class=""></div><div dir="auto" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">If there is any specific downside to using no-sql databases, or any reason it would not make sense, I would appreciate it if you can explain it a bit. I am aware of the latency it would introduce, but was under the impression that DynDB is introduced to address that.</div></div></blockquote><div><br class=""></div><div><div class="">Such use case (authoritative data) is fine, I was merely speaking about caching server before.</div><div class=""><br class=""></div><div class="">You have to calculate the benefit-cost ratio yourself compared to other provisioning systems - f.e. hidden primary with multiple secondaries updated with nsupdate works reasonably well in smaller deployments.</div><div class=""><br class=""></div><div class="">Cheers,</div>Ondrej<br class=""><div class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div>--</div><div>Ondřej Surý (He/Him)</div><div><a href="mailto:ondrej@isc.org" class="">ondrej@isc.org</a></div><div><br class=""></div><div>My working hours and your working hours may be different. Please do not feel obligated to reply outside your normal working hours.</div></div></div></div></div><div><br class=""><blockquote type="cite" class=""></blockquote></div></div><br class=""><blockquote type="cite" class=""><div class=""><div id="composer_signature" dir="auto" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">Regards<div dir="auto" class="">Hamid Maadani</div></div><div dir="auto" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br class=""></div><div style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br class=""></div><div align="left" dir="auto" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><div class="">-------- Original message --------</div><div class="">From: Hamid Maadani <<a href="mailto:hamid@dexo.tech" class="">hamid@dexo.tech</a>><span class="Apple-converted-space"> </span></div><div class="">Date: 8/24/22 01:08 (GMT-08:00)<span class="Apple-converted-space"> </span></div><div class="">To: Ondřej Surý <<a href="mailto:ondrej@isc.org" class="">ondrej@isc.org</a>>, Evan Hunt <<a href="mailto:each@isc.org" class="">each@isc.org</a>><span class="Apple-converted-space"> </span></div><div class="">Cc:<span class="Apple-converted-space"> </span><a href="mailto:bind-users@lists.isc.org" class="">bind-users@lists.isc.org</a></div><div class="">Subject: Re: Thread handling<span class="Apple-converted-space"> </span></div><div class=""><br class=""></div></div><div data-html-editor-font-wrapper="true" style="caret-color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: arial, sans-serif; font-size: 13px;" class="">> BIND does have dyndb support, since 9.11.<br class="">> As far as I know, though, the only two dyndb modules in existence are<br class="">> the bind-dyndb-ldap modiule that was written by Red Hat as part of<br class="">> FreeIPA, and a toy module used for testing. If you were interested in<br class="">> writing your MongoDB module for dyndb instead of DLZ, I'd be quite<br class="">> excited about that, I've long hoped the API would get more use.<br class=""><br class="">Interesting. I looked in the contrib directory and only found the DLZ modules there. Can you please point me in the direction of the source code for that toy module?<br class="">I would definitely work on a mongo-dyndb implementation as well, when the time permits.<br class=""><div class="">> I am fairly confident that any advantage from shared cache will be lost because the extra latency caused by communication with the MongoDB (or any other no-sql systems).</div><div class="">> Perhaps, describing the use case first (why do you want to use MongoDB at all) might have the benefit of not wasting time on your end.</div><br class="">This is a bit confusing to me. As I understand it, a normal bind zone is loaded into memory, and requests are served from that memory-cache, hence super fast.<br class="">DLZ modules however, make a call to the backend database per query. Which would introduce latency (in my tests, 50ms when using an Atlas cluster in the same geographical region). However, why would this be specific to no-sql databases?! Doesn't this also apply to any sql based DB?<br class=""><br class="">Now, an advantage of DLZ, is any change you make to the backend DB takes place immediately without the need to reload the server. Not a huge advantage in my personal opinion, but I do see the use case for it.<br class="">Looking for a way to load queried records from a backend database into memory to speed up the responses, I found posts about the DynDB API. If Evan can kindly point me in the right direction there, I will be developing both DLZ and DynDB modules for MongoDB, as I do see use cases for each one.<br class=""><br class="">The caching question that I asked, was more around having a workaround without DynDB, because I was under the impression that DynDB API is not available at the moment. My understanding of a BIND caching server (and admittedly , I am by no means an advanced user when it comes to BIND), is that it would query records from another server, and cache them for the life (TTL) of that record, and serve it. This cache, exists in memory, correct?<br class="">So in theory, if I was to use a DLZ to keep my records in a backend DB, I can technically create a BIND server with the DLZ enabled (let's say a docker image), and then put a caching server in front of it, which is "customer facing".<br class="">That way, all queries will come to the caching server, and will be served super fast because they are cached in memory, but the actual records live in a backend DB somewhere.<br class="">Long story short, I was trying to see if the same can be achieved with one single instance instead of two, which sounds like it can not be done.<br class=""><br class="">Regards<br class="">Hamid Maadani<br class=""><br class="">August 24, 2022 12:40 AM, "Ondřej Surý" <<a href="mailto:ondrej@isc.org?to=%22Ond%C5%99ej%20Sur%C3%BD%22%20%3Condrej@isc.org%3E" tabindex="-1" class="">ondrej@isc.org</a>> wrote:<br class=""><blockquote class=""><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class=""><blockquote type="cite" class=""><div class="">On 24. 8. 2022, at 8:48, Evan Hunt <<a href="mailto:each@isc.org" tabindex="-1" rel="external nofollow noopener noreferrer" class="">each@isc.org</a>> wrote:</div><div class=""><div class=""><blockquote type="cite" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">In the absence of that, is caching from DLZ a possible configuration<br class="">on a single BIND server?</blockquote><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Not DLZ, no. And I'm not sure dyndb can be used for the cache database,</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">either; do you know something about it that I don't?</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">It would definitely be easier to *make* dyndb work for the cache;</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">it has all the necessary API calls, and DLZ doesn't. But I don't</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">know a way to configure it to take the place of the cache currently.</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">If you do, please educate me.</span></div></div></blockquote></div><div class="">I am fairly confident that any advantage from shared cache will be lost because the extra latency caused by communication with the MongoDB (or any other no-sql systems).</div><div class=""></div><div class="">Perhaps, describing the use case first (why do you want to use MongoDB at all) might have the benefit of not wasting time on your end.</div><div class=""></div><div class="">Ondrej</div><div class=""><div class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class="">--</div><div class="">Ondřej Surý (He/Him)</div><div class=""><a href="mailto:ondrej@isc.org" tabindex="-1" rel="external nofollow noopener noreferrer" class="">ondrej@isc.org</a></div><div class=""></div><div class="">My working hours and your working hours may be different. Please do not feel obligated to reply outside your normal working hours.</div><div class=""></div></div></div></div></div></div></div></div></blockquote></div><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">--<span class="Apple-converted-space"> </span></span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Visit<span class="Apple-converted-space"> </span></span><a href="https://lists.isc.org/mailman/listinfo/bind-users" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">https://lists.isc.org/mailman/listinfo/bind-users</a><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class=""><span class="Apple-converted-space"> </span>to unsubscribe from this list</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">ISC funds the development of this software with paid support subscriptions. 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