[Samba] After a power outage Samba DNS is no longer working properly
Patrick Goetz
pgoetz at math.utexas.edu
Fri Aug 26 23:15:33 UTC 2022
Oh, I should add to this that is searching the web I found this command:
root at samba-dc:~# samba_dnsupdate --verbose --all-names
That results in, among other things, errors that look like this:
----------------------------------------------
; TSIG error with server: tsig verify failure
Failed nsupdate: 2
update(nsupdate): SRV
_ldap._tcp.Default-First-Site-Name._sites.ForestDnsZones.ea.my_org.org
samba-dc.ea.my_org.org 389
Calling nsupdate for SRV
_ldap._tcp.Default-First-Site-Name._sites.ForestDnsZones.ea.my_orgs.org
samba-dc.ea.my_org.org 389 (add)
Successfully obtained Kerberos ticket to DNS/samba-dc.ea.myorg.org as
SAMBA-DC$
Outgoing update query:
;; ->>HEADER<<- opcode: UPDATE, status: NOERROR, id: 0
;; flags:; ZONE: 0, PREREQ: 0, UPDATE: 0, ADDITIONAL: 0
;; UPDATE SECTION:
_ldap._tcp.Default-First-Site-Name._sites.ForestDnsZones.ea.my_org.org.
900 IN SRV 0 100 389 samba-dc.ea.my_org.org.
; TSIG error with server: tsig verify failure
Failed nsupdate: 2
Failed update of 29 entries
----------------------------------------------
<rant>I ran a Samba 3 server for this org for 12 years. In their
previous locations they had power outages on an almost weekly basis and
yet Samba 3 *never* crashed and burned. Now running Samba 4 in a new
location, and the very first time there's a power hiccup it falls part.
There is literally nothing which should make the software fail like
this.</rant>
On 8/26/22 15:05, Patrick Goetz via samba wrote:
>
> OS: Ubuntu 20.04.3
> Samba version: 4.15.2 from Louis' repo
>
> We suffered a power outage after which Samba DNS resolution no longer
> works and I can't figure out why. The domain controller continues to be
> aware of its client machines:
>
> root at samba-dc:~# samba-tool dns query samba-dc ea.my_org.org ea124 A -U
> Administrator
> Password for [EA\Administrator]:
> Name=, Records=1, Children=0
> A: 172.18.90.124 (flags=f0, serial=110, ttl=1200)
>
>
> root at samba-dc:~# samba-tool dns query samba-dc 90.18.172.in-addr.arpa
> 124 PTR -U Administrator
> Password for [EA\Administrator]:
> Name=, Records=1, Children=0
> PTR: EA124.ea.my_org.org (flags=f0, serial=7, ttl=900)
>
> However, on the Windows 10 clients (specifically ea124)
>
> net use G: \\data2\share
>
> gives a characteristically cryptic Microsoft error message: Error 53
> which turns out to mean it can't resolve the host name. If I substitute
> the share server's IP address:
>
> net use G: \\127.18.90.30\share
>
> then the mount executes as one would expect.
>
> The Wiki page here:
> https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwiki.samba.org%2Findex.php%2FDNS_Administration&data=05%7C01%7C%7C72149244adb241bddc9d08da87a0b21e%7C31d7e2a5bdd8414e9e97bea998ebdfe1%7C0%7C0%7C637971421504331373%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=UhNlXcoit6hdPl%2Bs2HteeiG6hYR%2FAavVPN0eypf8jSc%3D&reserved=0
>
>
> is very sparse on details of how one would go about debugging or
> repairing this issue. I seem to recall people running into this on much
> larger networks than mine, but googling and searching the list didn't
> bring up any useful information.
>
> Anyone have any ideas?
>
>
>
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