DNS not working among other errors after updating

UCS - Univention Corporate Server
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#1

Hey guys.

After an update and a reboot, the server started having some issues. The main one was the inability to get new machines on the domain due to a DNS error. When trying nslookup, host and even trying to force a dns update, I saw that it does not find the server, as in the errors below.
log.samba:

[2023/06/20 16:22:46.439658,  0, pid=1357] ../../lib/util/util_runcmd.c:355(samba_runcmd_io_handler)
  /usr/sbin/samba_dnsupdate: Traceback (most recent call last):
[2023/06/20 16:22:46.439692,  0, pid=1357] ../../lib/util/util_runcmd.c:355(samba_runcmd_io_handler)
  /usr/sbin/samba_dnsupdate:   File "/usr/sbin/samba_dnsupdate", line 914, in <module>
[2023/06/20 16:22:46.439699,  0, pid=1357] ../../lib/util/util_runcmd.c:355(samba_runcmd_io_handler)
  /usr/sbin/samba_dnsupdate:     creds = get_credentials(lp)
[2023/06/20 16:22:46.439703,  0, pid=1357] ../../lib/util/util_runcmd.c:355(samba_runcmd_io_handler)
  /usr/sbin/samba_dnsupdate:   File "/usr/sbin/samba_dnsupdate", line 214, in get_credentials
[2023/06/20 16:22:46.439707,  0, pid=1357] ../../lib/util/util_runcmd.c:355(samba_runcmd_io_handler)
  /usr/sbin/samba_dnsupdate:     get_krb5_rw_dns_server(creds, sub_vars['DNSDOMAIN'] + '.')
[2023/06/20 16:22:46.439711,  0, pid=1357] ../../lib/util/util_runcmd.c:355(samba_runcmd_io_handler)
  /usr/sbin/samba_dnsupdate:   File "/usr/sbin/samba_dnsupdate", line 173, in get_krb5_rw_dns_server
[2023/06/20 16:22:46.439715,  0, pid=1357] ../../lib/util/util_runcmd.c:355(samba_runcmd_io_handler)
  /usr/sbin/samba_dnsupdate:     rw_dns_servers = get_possible_rw_dns_server(creds, domain)
[2023/06/20 16:22:46.439719,  0, pid=1357] ../../lib/util/util_runcmd.c:355(samba_runcmd_io_handler)
  /usr/sbin/samba_dnsupdate:   File "/usr/sbin/samba_dnsupdate", line 152, in get_possible_rw_dns_server
[2023/06/20 16:22:46.439729,  0, pid=1357] ../../lib/util/util_runcmd.c:355(samba_runcmd_io_handler)
  /usr/sbin/samba_dnsupdate:     ans_soa = check_one_dns_name(domain, 'SOA')
[2023/06/20 16:22:46.439733,  0, pid=1357] ../../lib/util/util_runcmd.c:355(samba_runcmd_io_handler)
  /usr/sbin/samba_dnsupdate:   File "/usr/sbin/samba_dnsupdate", line 308, in check_one_dns_name
[2023/06/20 16:22:46.439736,  0, pid=1357] ../../lib/util/util_runcmd.c:355(samba_runcmd_io_handler)
  /usr/sbin/samba_dnsupdate:     return resolver.resolve(name, name_type)
[2023/06/20 16:22:46.439740,  0, pid=1357] ../../lib/util/util_runcmd.c:355(samba_runcmd_io_handler)
  /usr/sbin/samba_dnsupdate:   File "/usr/lib/python3/dist-packages/dns/resolver.py", line 1002, in query
[2023/06/20 16:22:46.439746,  0, pid=1357] ../../lib/util/util_runcmd.c:355(samba_runcmd_io_handler)
  /usr/sbin/samba_dnsupdate:     raise NXDOMAIN(qnames=qnames_to_try, responses=nxdomain_responses)
[2023/06/20 16:22:46.439749,  0, pid=1357] ../../lib/util/util_runcmd.c:355(samba_runcmd_io_handler)
  /usr/sbin/samba_dnsupdate: dns.resolver.NXDOMAIN: The DNS query name does not exist: example.local.
[2023/06/20 16:22:46.455607,  0, pid=1357] ../../source4/dsdb/dns/dns_update.c:86(dnsupdate_nameupdate_done)
  dnsupdate_nameupdate_done: Failed DNS update with exit code 1

host -al $(dnsdomainname):

Trying "example.local"
Host example.local not found: 9(NOTAUTH)
; Transfer failed.

nslookup example.local:

Server:         192.168.0.5
Address:        192.168.0.5#53

** server can't find example.local: NXDOMAIN

If a run samba_upgradedns --dns-backend=BIND9_DLZ:

Reading domain information
DNS accounts already exist
No zone file /var/lib/samba/bind-dns/dns/EXAMPLE.LOCAL.zone (normal)
DNS partitions already exist
dns-srvucs account already exists
See /var/lib/samba/bind-dns/named.conf for an example configuration include file for BIND
and /var/lib/samba/bind-dns/named.txt for further documentation required for secure DNS updates
Finished upgrading DNS

In addition, the System Diagnostics also gives some errors.
image

This package error is from lvm2, after running dpkg --configure -a:

Configurando lvm2 (2.03.02-3) ...
update-initramfs: deferring update (trigger activated)
Failed to restart lvm2-lvmpolld.service: Unit lvm2-lvmpolld.socket is masked.
invoke-rc.d: initscript lvm2-lvmpolld, action "restart" failed.
● lvm2-lvmpolld.service - LVM2 poll daemon
   Loaded: loaded (/lib/systemd/system/lvm2-lvmpolld.service; static; vendor preset: enabled)
   Active: inactive (dead)
     Docs: man:lvmpolld(8)
dpkg: erro ao processar o pacote lvm2 (--configure):
 o subprocesso instalado, do pacote lvm2, o script post-installation retornou erro do status de saída 1
A processar 'triggers' para initramfs-tools (0.133+deb10u1) ...
update-initramfs: Generating /boot/initrd.img-4.19.0-24-amd64
Erros foram encontrados durante o processamento de:
 lvm2

Any idea how to solve these problems? At least the DNS one…

Thanks

#2

Do you try the fix button for “reset Kerberos/KDC to 127.0.0.1” ?
This could be fix your DNS issue.

#3

I managed to solve. It turned out that the problem was the same as this topic Installing openntpd seems to break the installation - UCS - Univention Corporate Server - Univention Help. I reinstalled the packages and the problem was solved. I also solved the lvm2 problem and at the moment, everything is working. Thanks

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