Unbound seems to be restarting frequently
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How many people having this issue are using a config that used to use the forwarder rather than the resolver? And how many of those people still have the top 3 DHCP options checked in the forwarder, even though the forwarder is disabled?
If this is the case, humor me here… go to the DNS forwarder page, check the top enable box to enable access to the 3 DHCP options boxes below it, uncheck all 3 DHCP options boxes, then uncheck the top enable box (so we don't unwantingly enable the forwarder), click the save button, verify that all 3 DHCP options boxes for the forwarder are now unchecked and disabled once the page reloads, and reboot pfSense for sanity.
Please post back as to what effect this has on Unbound reloads… either the same, less frequently, or eliminates them all together.
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I have the same problem with unbound constantly reloading and having no DNS resolution for about 30 seconds every few minutes. I did have both the dynamic and static DHCP clients options ticked for DNS but I disabled them both and it didn't fix it. I have come to the conclusion that unbound is so broken that I've had to switch back to dnsmasq and now it's all working fine. I was using forwarding in unbound anyway (I am running multi-WAN with failover), so it doesn't really bother me having to switch.
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How many people having this issue are using a config that used to use the forwarder rather than the resolver?
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Please post back as to what effect this has on Unbound reloads... either the same, less frequently, or eliminates them all together.I sure hope it eliminates them altogether. I have noticed (and came looking, and found this thread) that it NEVER runs more than an hour at a time, and that can't help cache performance one stinking bit. Sometimes it does appear to get down to 30 minutes or even a minute or two (without settings changes going on.) But absolutely never more than an hour. Not so peachy.
Got it rebooted, we'll see.
That would be "Nope, didn't help a bit." Well, I guess it did get just over 4 hours in one place there. But mostly no help.
Oct 16 08:49:49 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 08:49:48 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 07:49:21 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 07:49:21 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 06:48:58 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 06:48:58 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 06:47:45 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 06:47:45 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 06:35:23 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 06:35:23 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 06:30:07 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 06:30:07 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 06:26:31 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 06:26:31 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 06:24:05 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 06:24:05 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 06:22:25 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 06:22:25 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 06:21:29 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 06:21:29 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 06:20:58 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 06:20:58 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 06:19:57 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 06:19:56 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 06:12:45 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 06:12:45 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 06:11:16 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 06:11:16 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 06:09:50 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 06:09:50 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 06:07:16 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 06:07:16 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 06:01:39 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 06:01:39 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 06:01:02 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 06:01:02 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 06:00:36 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 06:00:35 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 06:00:34 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 06:00:34 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 05:59:10 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 05:59:10 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 05:59:04 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 05:59:04 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 05:52:44 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 05:52:44 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 05:52:24 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 05:52:24 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 05:51:53 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 05:51:53 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 05:50:09 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 05:50:09 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 05:49:59 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 05:49:59 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 05:49:15 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 05:49:15 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 05:48:56 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 05:48:55 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 05:47:53 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 05:47:53 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 04:43:13 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 04:43:13 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 03:41:43 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 03:41:43 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 03:41:42 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 03:41:42 unbound: [69305:0] info: service stopped (unbound 1.5.3). Oct 16 03:41:41 unbound: [69305:0] info: start of service (unbound 1.5.3). Oct 16 03:41:40 unbound: [22642:0] info: service stopped (unbound 1.5.3). Oct 16 03:41:00 unbound: [22642:0] info: start of service (unbound 1.5.3). Oct 16 03:41:00 unbound: [22642:0] info: service stopped (unbound 1.5.3). Oct 16 03:40:59 unbound: [22642:0] info: start of service (unbound 1.5.3). Oct 16 03:40:59 unbound: [22642:0] info: service stopped (unbound 1.5.3). Oct 16 03:40:58 unbound: [22642:0] info: start of service (unbound 1.5.3). Oct 16 03:40:58 unbound: [22642:0] info: service stopped (unbound 1.5.3). Oct 16 03:40:57 unbound: [22642:0] info: start of service (unbound 1.5.3). Oct 16 03:40:57 unbound: [22642:0] info: service stopped (unbound 1.5.3). Oct 16 03:40:57 unbound: [22642:0] info: start of service (unbound 1.5.3). Oct 15 23:33:46 unbound: [35431:0] info: start of service (unbound 1.5.3). Oct 15 23:33:46 unbound: [35431:0] info: service stopped (unbound 1.5.3). Oct 15 23:33:46 unbound: [35431:0] info: start of service (unbound 1.5.3). Oct 15 23:33:46 unbound: [35431:0] info: service stopped (unbound 1.5.3). Oct 15 23:33:46 unbound: [35431:0] info: start of service (unbound 1.5.3). Oct 15 23:33:46 unbound: [15076:0] info: service stopped (unbound 1.5.3). Oct 15 23:33:41 unbound: [15076:0] info: start of service (unbound 1.5.3).Having a boatload of resources free because I can't run traffic shaping and transparent squid since 2.1.x, I cranked all the settings in the resolver to maximum (they were already bumped up quite a bit from defaults) though I doubt it will have any effect. But what the heck…
So with all the settings cranked we got - an hour and 17 seconds.
Oct 16 10:47:34 unbound: [63283:0] info: service stopped (unbound 1.5.3). Oct 16 09:47:17 unbound: [63283:0] info: start of service (unbound 1.5.3).…and then things went downhill.
Oct 16 12:03:38 unbound: [63283:0] info: start of service (unbound 1.5.3). Oct 16 12:03:38 unbound: [63283:0] info: service stopped (unbound 1.5.3). Oct 16 12:03:20 unbound: [63283:0] info: start of service (unbound 1.5.3). Oct 16 12:03:20 unbound: [63283:0] info: service stopped (unbound 1.5.3). Oct 16 12:02:08 unbound: [63283:0] info: start of service (unbound 1.5.3). Oct 16 12:02:08 unbound: [63283:0] info: service stopped (unbound 1.5.3). Oct 16 12:01:26 unbound: [63283:0] info: start of service (unbound 1.5.3). Oct 16 12:01:26 unbound: [63283:0] info: service stopped (unbound 1.5.3). Oct 16 11:59:31 unbound: [63283:0] info: start of service (unbound 1.5.3). Oct 16 11:59:31 unbound: [63283:0] info: service stopped (unbound 1.5.3). Oct 16 11:58:50 unbound: [63283:0] info: start of service (unbound 1.5.3). Oct 16 11:58:50 unbound: [63283:0] info: service stopped (unbound 1.5.3). Oct 16 11:56:58 unbound: [63283:0] info: start of service (unbound 1.5.3). Oct 16 11:56:58 unbound: [63283:0] info: service stopped (unbound 1.5.3). Oct 16 11:56:30 unbound: [63283:0] info: start of service (unbound 1.5.3). Oct 16 11:56:30 unbound: [63283:0] info: service stopped (unbound 1.5.3). Oct 16 11:52:29 unbound: [63283:0] info: start of service (unbound 1.5.3). Oct 16 11:52:29 unbound: [63283:0] info: service stopped (unbound 1.5.3). Oct 16 11:51:46 unbound: [63283:0] info: start of service (unbound 1.5.3). Oct 16 11:51:45 unbound: [63283:0] info: service stopped (unbound 1.5.3). Oct 16 11:50:39 unbound: [63283:0] info: start of service (unbound 1.5.3). Oct 16 11:50:39 unbound: [63283:0] info: service stopped (unbound 1.5.3). Oct 16 11:49:04 unbound: [63283:0] info: start of service (unbound 1.5.3). Oct 16 11:49:03 unbound: [63283:0] info: service stopped (unbound 1.5.3). Oct 16 11:48:37 unbound: [63283:0] info: start of service (unbound 1.5.3). Oct 16 11:48:37 unbound: [63283:0] info: service stopped (unbound 1.5.3). Oct 16 10:47:34 unbound: [63283:0] info: start of service (unbound 1.5.3).Back to dnsMasq for now. Perhaps I'll try unbound on a separate server at some point, clearly there are issues with the package that degrade its potential usefulness.
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On my hardware at least, this stops Unbound from restarting until a config change is made to DHCP. When the DHCP config change is applied, Unbound gets restarted, and then starts doing the same old restart every hour or less deal, until the pfSense box is rebooted. On a fresh reboot with no config changes Unbound has run for about 15 days without restarting (longest I've gone without a config change lately).
The issue is not in the package, it's in the scripts controlling it. The way the scripts are written now, they insert data into Unbound's config files, then restart the service for Unbound to reload those config files and pull in the changes. Dnsmasq is handled the same way, except it will hold its cache and re-read config files upon getting a SIGHUP.
The right way to handle local DNS changes, for Unbound at least, would basically be to do the opposite of what is being done now. Rather than write to the config files and bounce the service, you would use unbound-control to tell Unbound about the new local DNS changes and let it write the config files.
The code is almost completely written already, all that needs to be done is for someone that knows what to change and has the time to change it, to go through all the Unbound functions and replace config file writes with unbound-control command calls that use almost identical syntax. For example, instead of writing local-data-ptr to a file like this and bouncing the service (how it's done now):
$unbound_entries .= "local-data: \"{$host['fqdn']} {$type} {$host['ipaddr']}\"\n";You would do something like this and not ever restart the service:
$unbound_cmd .= "unbound-control local_data {$host['fqdn']} {$type} {$host['ipaddr']}";Same thing with removing local DNS entries, every unbound-control add command has a corresponding remove command, local_data_remove for this example.
If Unbound doesn't write the entries to the config files in case of a user forced service stop / restart, then the code in use now is already maintaining consistency in the config files. Or you could simply re-add all the local DNS records with unbound-control calls on service start. Either way would work fine.
If memory serves, this was a lot of the reasoning behind using Unbound over Dnsmasq. Because Dnsmasq has nothing like unbound-control to insert and remove DNS records, and even make live config changes, without doing a full config reload / service restart. Why this was not carried over to implementation is beyond me. Ask the man upstairs.
Also, clearly, some functions are being called in the wrong place, and this needs to be cleaned up as well. The DHCP register check boxes on the forwarder page should have no effect on the resolver what so ever, but it appears they absolutely do, as noted above. Also, the same DHCP register check boxes on the resolver page seem to only write these items to the Unbound config files without restarting the service, which is only half right the way it is currently implemented (you would expect a service restart to follow). This all needs to be changed to use unbound-control anyways, but should be noted on the fix Unbound to do list with everything else.
Thank you and good night :D
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The issue is not in the package, it's in the scripts controlling it. The way the scripts are written now, they insert data into Unbound's config files, then restart the service for Unbound to reload those config files and pull in the changes. Dnsmasq is handled the same way, except it will hold its cache and re-read config files upon getting a SIGHUP.
The right way to handle local DNS changes, for Unbound at least, would basically be to do the opposite of what is being done now. Rather than write to the config files and bounce the service, you would use unbound-control to tell Unbound about the new local DNS changes and let it write the config files.
Whilst this sounds promising, have you code read unbound to check what unbound-control local_data and unbound-control local_data_remove actually do? If these commands force a cache flush, then there is no gain and potential losses in your proposed approach. If unbound uses a cache walk to discard affected RR(s), a different potential performance issue arises if this process is blocking, especially if unbound is started with no local RRs and they are added one at a time using unbound-control. If cache discard takes place via a non-blocking cache walk or no cached RR removal takes place, the possibility of race conditions exists, as stale RR data will be served for an indeterminate but potentially significant time.
Rather than using unbound-control to insert all RRs on startup, a hybrid approach is possible - start unbound with the current state in the configuration files, then use unbound-control for subsequent changes.
One complexity in implementing your proposed approach is a frustrating non-orthogonality in the local_data and local_data_remove commands. local_data adds a single RR. local_data_remove removes all RRs for the given name - which might include both A and AAAA records for the same name (and, if local_data_remove for PTR records is called by the name rather than the IP address, this means IPv4 and/or IPv6 PTR records pointing to that name will also be removed). IPv4 and IPv6 address allocation use entirely separate processes that have no guarantees on temporal relationship. There are circumstances where you might want to remove just one RR, which means you have to remove all RRs for the name then re-add any wanted RRs.
If there are advantages to using unbound-control, it might be better to add support for unbound control to pfSense by generating a new unbound configuration as at present, then diffing it with the old configuration. If there are changes solely in local data (i.e. in dhcpleases_entries.conf and/or host_entries.conf), pfSense could use the output of the diff to make appropriate calls to unbound-control, otherwise replace the old configuration with the new and send unbound a SIGHUP. This approach has the advantage of ensuring consistency (for example by ensuring explicitly configured local-data is not accidentally removed) and is easily removed if unbound gets saner SIGHUP behaviour in the future. One implementational complexity is the need to call unbound-control local_data for any explicit local-data and local-data-ptr in unbound.conf after you call unbound-control local_data_remove for the same name.
Another possibility is to use an entirely separate DNS server for local zone(s), defining them in Unbound as stub zones. There is potential advantage here in terms of being able to DNSSEC sign these zones. However, when data changes, stale data would be cached in Unbound that would require carefully targeted calls to unbound-control flush_type or a costly (because of the cache walk) unbound-control flush_zone to remove.
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The issue is not in the package, it's in the scripts controlling it. The way the scripts are written now, they insert data into Unbound's config files, then restart the service for Unbound to reload those config files and pull in the changes. Dnsmasq is handled the same way, except it will hold its cache and re-read config files upon getting a SIGHUP.
The right way to handle local DNS changes, for Unbound at least, would basically be to do the opposite of what is being done now. Rather than write to the config files and bounce the service, you would use unbound-control to tell Unbound about the new local DNS changes and let it write the config files.
Whilst this sounds promising, have you code read unbound to check what unbound-control local_data and unbound-control local_data_remove actually do? If these commands force a cache flush, then there is no gain and potential losses in your proposed approach. If unbound uses a cache walk to discard affected RR(s), a different potential performance issue arises if this process is blocking, especially if unbound is started with no local RRs and they are added one at a time using unbound-control. If cache discard takes place via a non-blocking cache walk or no cached RR removal takes place, the possibility of race conditions exists, as stale RR data will be served for an indeterminate but potentially significant time.
Answers to all of your questions are in plain text here:
https://www.unbound.net/documentation/unbound-control.htmlNo, but the fact that local add / remove commands only process local data space makes it pretty clear.
No race condition exists. Simply process 1 unbound-control command at a time. unbound-control returns completion. At the rate they execute I would guess even with lots of local custom entries (say 200+), which even the documentation states not to use Unbound on its own as a full hosted DNS solution, this would happen very quickly. Since it would only happen on service start, the impact would be even more who gives a fuck sort of minimal. Ditto for local removals. Cap it off with the "well what if 500+ DHCP client releases happen at the end of the day" answer of "if your pfSense hardware can handle serving 500+ clients all day, it can easily handle removing 500+ local DNS entries quickly".
Rather than using unbound-control to insert all RRs on startup, a hybrid approach is possible - start unbound with the current state in the configuration files, then use unbound-control for subsequent changes.
Yup, I gave that as 1 of 2 possible ways to go.
One complexity in implementing your proposed approach is a frustrating non-orthogonality in the local_data and local_data_remove commands. local_data adds a single RR. local_data_remove removes all RRs for the given name - which might include both A and AAAA records for the same name (and, if local_data_remove for PTR records is called by the name rather than the IP address, this means IPv4 and/or IPv6 PTR records pointing to that name will also be removed). IPv4 and IPv6 address allocation use entirely separate processes that have no guarantees on temporal relationship. There are circumstances where you might want to remove just one RR, which means you have to remove all RRs for the name then re-add any wanted RRs.
Since we are only dealing with local FQDN and localHost.localDomain records, also a non issue. If there are multiple records pointing to the same FQDN / localHost.localDomain and a DHCP event causes them to need removal, now we only need to issue a single unbound-control remove command. If that breaks ANYTHING local DNS wise (it won't), than very very worst case scenario, we continue to bounce the service only on custom static override changes (please don't do this).
If there are advantages to using unbound-control, it might be better to add support for unbound control to pfSense by generating a new unbound configuration as at present, then diffing it with the old configuration. If there are changes solely in local data (i.e. in dhcpleases_entries.conf and/or host_entries.conf), pfSense could use the output of the diff to make appropriate calls to unbound-control, otherwise replace the old configuration with the new and send unbound a SIGHUP. This approach has the advantage of ensuring consistency (for example by ensuring explicitly configured local-data is not accidentally removed) and is easily removed if unbound gets saner SIGHUP behaviour in the future. One implementational complexity is the need to call unbound-control local_data for any explicit local-data and local-data-ptr in unbound.conf after you call unbound-control local_data_remove for the same name.
Yes, to the "somebody with the time needs to test this", I would agree with my own previous post.
No to the rest. You're over thinking it now. Forget SIGHUP for Unbound. Consistency is already being maintained in config files by current code. We need to dump the service restart bullshit, or dump Unbound. Love it or leave it. It will never work correctly if you aren't smart enough to maintain local records without bouncing the service or dumping the non-local cache needlessly.
Another possibility is to use an entirely separate DNS server for local zone(s), defining them in Unbound as stub zones. There is potential advantage here in terms of being able to DNSSEC sign these zones. However, when data changes, stale data would be cached in Unbound that would require carefully targeted calls to unbound-control flush_type or a costly (because of the cache walk) unbound-control flush_zone to remove.
I thought about that, so have others, and some have implemented it, it's not hard with current RELEASE stock packages. Use dnsmasq for local DNS, add domain overrides to Unbound to point to dnsmasq's local custom port. Domain overrides bypass Unbound's cache, so removing stale entries is a non-issue. The issue here is that it is not the right solution. It's an unnecessary workaround at best, and that's not what anyone wants to see time spent on. We would rather see time spent on correct implementation.
For the same reason, completely forget about commands issuing full cache walks too. Even on fast hardware, churning through a potential 1GB of tables, even in RAM, is just stupid when you have the option of not ever doing that.
Edit: Added considerations for pfSense hardware capacity & localHost.localDomain scenario. No methods changed.
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Is it just me who's finding similar masturbation absurd? Why not fix the braindead SIGHUP handling instead?
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Because if you had thought it through you would realize there's nothing to fix as far as Unbound itself goes. The design of Unbound is to not need absurd (old) things like custom SIGHUP handling because it has something far more versatile, unbound-control.
unbound-control is Unbound's SIGHUP replacement, just infinitely more useful, since you can feed it parameters and get success / failure returns. Far more securely and gracefully at that.
RTFM my friend.
To repeat again, and again, Unbound was picked for this reason. If the devs now regret that decision because they are stuck on using replaced for a good reason functions like throwing SIGHUP's all over the place, they should pick something older and worse than Unbound as the resolver.
And that would be sad, because Unbound is a GREAT caching DNS resolver when you use it correctly.
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Is it just me who's finding similar masturbation absurd? Why not fix the braindead SIGHUP handling instead?
Because that would itself be absurd.
You are the master of solutions to problems that should never have existed in the first place. If I ever score a "paid by the line" coding position you are my first hire.
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P.S. As for hires - not interested, thanks. ::)
Oh don't worry, I refuse pay by line type jobs. And all of my clients prefer dealing with people who know what they're doing. That was the point, but you missed it.
Don't forget, last time we did this, as soon as someone who knew what they were talking about finally chimed in, I believe it was something to the tune of "I think you are spot on here". Yup, it was.
As far as helping you, I think this is a good start:
http://www.goodtherapy.org/therapy-for-control-issues.html -
Perhaps, can you send me further personal shit, hire offers and shrink doctor recommendations via PM? It will get safely ignored there; plus it won't produce useless noise for other forum users here that noone's interested in reading.
Alternatively, just STFU and start coding.
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Perhaps, can you send me further personal shit, hire offers and shrink doctor recommendations via PM? It will get safely ignored there; plus it won't produce useless noise for other forum users here that noone's interested in reading.
Alternatively, just STFU and start coding.
Because God forbid anyone else actually realize what a fucktard you are, right?
Ohhh, did you bump your head? Take your own advice there kiddo.
If you want to be a "I don't understand this so I'm going to troll and shit all over it" dick, on a non-technical and personal level, publicly. Then I will continue to hand you your ass, publicly. Perhaps your masturbation comment (really all of your comments) are more appropriate as a PM, since they do indeed fit your "useless noise for other forum users here that noone's interested in reading" category.
And again with the control issues. Seriously, get help. Your attitude is one only a mother on heroine could love.
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Lick my swamp.
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Snappy comeback.
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Bug opened: https://redmine.pfsense.org/issues/5413
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How many people having this issue are using a config that used to use the forwarder rather than the resolver? And how many of those people still have the top 3 DHCP options checked in the forwarder, even though the forwarder is disabled?
If this is the case, humor me here… go to the DNS forwarder page, check the top enable box to enable access to the 3 DHCP options boxes below it, uncheck all 3 DHCP options boxes, then uncheck the top enable box (so we don't unwantingly enable the forwarder), click the save button, verify that all 3 DHCP options boxes for the forwarder are now unchecked and disabled once the page reloads, and reboot pfSense for sanity.
Please post back as to what effect this has on Unbound reloads… either the same, less frequently, or eliminates them all together.
For me this stopped the repeated "unbound: service stopped", "unbound: start of service" messages 2-3 times per minute. Thanks - this was a longstanding issue.
It fit because this installation was previously dnsmasq, switched to unbound some time ago.
Specifically, the relevant part of the config export looked like this before:
<dnsmasq><regdhcpstatic><custom_options><domain_needed><no_private_reverse><interface></interface></no_private_reverse></domain_needed></custom_options></regdhcpstatic></dnsmasq>and like this after:
<dnsmasq><custom_options><domain_needed><no_private_reverse><interface></interface></no_private_reverse></domain_needed></custom_options></dnsmasq>It also took a reboot.
A more subtle issue for me is that machines seem to lose DNS resolution (maybe all connectivity?) for about 5 seconds every time their DHCP lease expires and is renewed. For now I've just lengthened DHCP leases significantly - they were short for testing. Separate issue I guess.
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I had to go back to DNS Forwarder (dnsmasq) because of this. Thank God it's still inthere and only a checkbox away.
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I know a bug report is not really the place for arguing about the merits of a solution, but I respectfully maintain some of my caution in https://forum.pfsense.org/index.php?topic=89589.msg568394#msg568394 , especially in relation to ky41083's assertion that there is no need ever to restart Unbound.
Changes in local-data can be handled via unbound-control as ky41083 says - though the inability to remove just the A or AAAA record will likely require some care, as both can exist for the same local host and there is no guaranteed temporal relationship between changes in A and AAAA. In particular, DHCP and DHCPv6 are entirely separate and not synchronous.
Unlike ky41083, I cannot see any alternative to restarting Unbound if there are configuration changes made to Unbound beyond changes to local data, as SIGHUP and unbound-control reload unfortunately amount to a reload at present (i.e. cache flush and re-read of the configuration files). unbound-control does not allow for on-the-fly reconfiguration of all aspects of Unbound. This is why I suggested a diff based approach on the forums as one possibility.
These are, of course, implementation points. I agree that Unbound should be reconfigured on-the-fly whenever possible. In time, I hope that Unbound will get saner SIGHUP handling, but this will likely be a lot of work.
Unfortunately, I have no time to work on this issue at present.
You are under thinking the problem and over thinking the solution.
Quickly now…
DHCPv4 & DHCPv6 are entirely separate and not synchronous, agreed. DNS records are only removed when a lease expires, right? How many milliseconds do you think will differ between v4 and v6 leases being obtained by the same host? So deleting just the A or just the AAAA record, vs removing them both at the same time, matters how much, in the real world? Milliseconds, that you can no longer resolve an internal host via DNS, which has been off for (DHCP lease period) anyhow.
If this causes issues for you, make your DHCPv4 & DHCPv6 lease expiration times identical, or fix your DHCP clients that aren't requesting v4 and v6 leases at the same time for who knows why.
If this is causing internal host overrides to be removed, you're putting persistent local host DNS records in the wrong place. DNS is where you put external DNS redirects. DHCP reservations is where you put persistent local host DNS records so they never get removed.
Please, I would love a correct list of things that cannot be changed without restarting Unbound, from someone that's not me.
