Sysvol mount with computer account fails sometimes

[kiarn]

Hello,

I'm experiencing the following ; about 1/3 of the computers are not able to mount sysvol at boot. As a consequence, the sysstart scripts can not be launched, but it does not block the login afterwards. Maybe that's why it's not really observed.

It seems that the network is not started when linuxclient tries to mount sysvol :

Sep 20 07:02:30 klz-01 linuxmuster-linuxclient7: [DEBUG] m108.linuxmuster.lan was changed to klz-01.linuxmuster.lan
Sep 20 07:02:30 klz-01 linuxmuster-linuxclient7: message repeated 2 times: [ [DEBUG] m108.linuxmuster.lan was changed to klz-01.linuxmuster.lan]
Sep 20 07:02:30 klz-01 linuxmuster-linuxclient7: [INFO] Trying to overwrite /etc/krb5.keytab
Sep 20 07:02:30 klz-01 onBoot[1020]: kinit: KDC für Realm »linuxmuster.lan« kann nicht gefunden werden bei Anfängliche Anmeldedaten werden geholt.
Sep 20 07:02:30 klz-01 linuxmuster-linuxclient7: [DEBUG] Calculating mountpoint of //dfgserver.linuxmuster.lan/sysvol
Sep 20 07:02:30 klz-01 linuxmuster-linuxclient7: [WARNING] Uid could not be found! Continuing anyway!
Sep 20 07:02:30 klz-01 linuxmuster-linuxclient7: [DEBUG] Trying to mount //dfgserver.linuxmuster.lan/sysvol to /srv/samba/KLZ-01$/sysvol
Sep 20 07:02:30 klz-01 linuxmuster-linuxclient7: [DEBUG] * Creating directory...
Sep 20 07:02:30 klz-01 linuxmuster-linuxclient7: [DEBUG] * Executing /usr/sbin/mount.cifs -o file_mode=0700,dir_mode=0700,sec=krb5,nodev,nosuid,mfsymlinks,nobrl,vers=3.0,user=KLZ-01$,domain=linuxmuster.lan //dfgserver.linuxmuster.lan/sysvol /srv/samba/KLZ-01$/sysvol
Sep 20 07:02:30 klz-01 linuxmuster-linuxclient7: [DEBUG] * Trying to mount...
Sep 20 07:02:30 klz-01 onBoot[978]: * Error mounting share //dfgserver.linuxmuster.lan/sysvol to /srv/samba/KLZ-01$/sysvol!
Sep 20 07:02:30 klz-01 linuxmuster-linuxclient7: [FATAL] * Error mounting share //dfgserver.linuxmuster.lan/sysvol to /srv/samba/KLZ-01$/sysvol!
Sep 20 07:02:30 klz-01 linuxmuster-linuxclient7: [INFO] === Running local hook onBoot ===
Sep 20 07:02:30 klz-01 onBoot[1031]: id: »KLZ-01$“: Einen solchen Benutzer gibt es nicht
Sep 20 07:02:30 klz-01 linuxmuster-linuxclient7: [WARNING] Exception when querying groups of user KLZ-01$, it probaply does not exist
Sep 20 07:02:30 klz-01 onBoot[1033]: id: »KLZ-01$“: Einen solchen Benutzer gibt es nicht
Sep 20 07:02:30 klz-01 linuxmuster-linuxclient7: [WARNING] Exception when querying groups of user KLZ-01$, it probaply does not exist
Sep 20 07:02:30 klz-01 linuxmuster-linuxclient7: [ERROR] Cloud not bind to ldap!
Sep 20 07:02:30 klz-01 linuxmuster-linuxclient7: [ERROR] === An exception occurred ===
Sep 20 07:02:30 klz-01 linuxmuster-linuxclient7: [ERROR] {desc: "Cant contact LDAP server", errno: 11, info: Resource temporarily unavailable}
Sep 20 07:02:30 klz-01 linuxmuster-linuxclient7: [ERROR] === end exception ===
Sep 20 07:02:30 klz-01 linuxmuster-linuxclient7: [ERROR] Cannot talk to LDAP
Sep 20 07:02:30 klz-01 linuxmuster-linuxclient7: [INFO] == Executing script /etc/linuxmuster-linuxclient7/onBoot.d/00_example.sh ==

And then 15s later :

Sep 20 07:02:45 klz-01 NetworkManager[753]: <info>  [1663650165.0987] device (eno1): carrier: link connected
Sep 20 07:02:45 klz-01 kernel: [   26.116090] e1000e 0000:00:19.0 eno1: NIC Link is Up 100 Mbps Full Duplex, Flow Control: None
Sep 20 07:02:45 klz-01 kernel: [   26.116100] e1000e 0000:00:19.0 eno1: 10/100 speed: disabling TSO
Sep 20 07:02:45 klz-01 kernel: [   26.116153] IPv6: ADDRCONF(NETDEV_CHANGE): eno1: link becomes ready
Sep 20 07:02:45 klz-01 kernel: [   26.116630] kauditd_printk_skb: 10 callbacks suppressed
Sep 20 07:02:45 klz-01 kernel: [   26.116641] audit: type=1400 audit(1663650165.094:64): apparmor="ALLOWED" operation="open" profile="/usr/sbin/sssd" name="/sys/devices/pci0000:00/0000:00:19.0/net/eno1/type" pid=1129 comm="sssd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
Sep 20 07:02:45 klz-01 NetworkManager[753]: <info>  [1663650165.0994] device (eno1): state change: unavailable -> disconnected (reason 'carrier-changed', sys-iface-state: 'managed')
Sep 20 07:02:45 klz-01 NetworkManager[753]: <info>  [1663650165.1006] policy: auto-activating connection 'Kabelgebundene Verbindung 1' (590442dd-4438-3e37-8ba9-3de248222ce6)
Sep 20 07:02:45 klz-01 NetworkManager[753]: <info>  [1663650165.1014] device (eno1): Activation: starting connection 'Kabelgebundene Verbindung 1' (590442dd-4438-3e37-8ba9-3de248222ce6)
Sep 20 07:02:45 klz-01 NetworkManager[753]: <info>  [1663650165.1016] device (eno1): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
Sep 20 07:02:45 klz-01 NetworkManager[753]: <info>  [1663650165.1021] manager: NetworkManager state is now CONNECTING
Sep 20 07:02:45 klz-01 NetworkManager[753]: <info>  [1663650165.1025] device (eno1): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
Sep 20 07:02:45 klz-01 NetworkManager[753]: <info>  [1663650165.1035] device (eno1): state change: config -> ip-config (reason 'none', sys-iface-state: 'managed')
Sep 20 07:02:45 klz-01 NetworkManager[753]: <info>  [1663650165.1044] dhcp4 (eno1): activation: beginning transaction (timeout in 45 seconds)

So it's pretty obvious that the network is down when linuxclient starts.

I tried to find a reason in the systemd direction and found this : https://github.com/systemd/systemd/issues/22360#issuecomment-1028665992

So I add :

Wants=network-online.target

in /etc/systemd/system/linuxmuster-linuxclient7.service and then reload systemd, but it doesn't seem to sufficient, because I still have the problem.

It's not really an issue in linuxclient, more a convention problem of what "online" means for the network, but I think it's important to mention it here. I will update this topic if I find some hints.

Arnaud

[dorianim]

That's really strange... I thought, that this should be solved by this line: https://github.com/linuxmuster/linuxmuster-linuxclient7/blob/3d7cb5fbefc06603febbd3fb17773e03a1385fda/usr/share/linuxmuster-linuxclient7/templates/linuxmuster-linuxclient7.service#L8

Is it a laptop?

[kiarn]

No, they are all workstations, wired with ethernet, and the problem appear in random mode : I'm not able to reproduce it on the same computer again. That's why it's pretty complicated for debugging.

I will try to disable NetworkManager-wait-online.service and see if it's better.

[kiarn]

Hello @dorianim

I did not forget this, but it's difficult to find the reason. But I think I was searching in the wrong direction. I assumed that the client was trying to mount sysvol without network, and maybe the problem is that the client is trying to mount it with network, but without resolver. If systemd-resolver does not start before linuxmuster-linuxclient7, then the client has no chance to mount \\dfgserver.linuxmuster.lan even if it's written in /etc/hosts. I will do further searchs ...

Arnaud

[dorianim]

That's an intresing idea... maybe we need to add systemd-resolved to the service unit file as a dependency?

[dorianim]

Maybe, it should also be after sssd.service instead of before ...

https://github.com/linuxmuster/linuxmuster-linuxclient7/blob/3dc223a415a03e73796809eab53a01666561a97f/usr/share/linuxmuster-linuxclient7/templates/linuxmuster-linuxclient7.service#L9

[kiarn]

systemd-resolved needs nss-lookup which comes after sssd, as you already found out.

[dorianim]

Well then, that's definetly a problem. Might be solved by just placing sssd.service in after

[hackbert]

We just tested to use sssd in After and it seems to work much better than before. Since sssd needs network-online we just use that one line in /etc/systemd/system/linuxmuster-linuxclient7.service:

After=sssd.service

All our testcases worked (and boot was a bit faster than before). We tested LAN, NoNetwork, School Wifi and Hotspot. In all cases boot was quick and Proxy autoconfig worked. The hookscripts where all executed (checked by greping for 00_example.sh in journactl -b0).

[roesslerrr]

Hallo!

Ich habe das jetzt auch mal bei uns an der Schule mit /etc/systemd/system/linuxmuster-linuxclient7.service auf dem Ubuntu-22.04-Client getestet.

Mit: [Unit] Description=linuxmuster: switch local and remote home depending on ad server connection After=network-online.target Before=sssd.service funktioniert die Anmeldung (mit dem Problem der laaaangen Wartezeit beim Booten in einem fremden Netz).

Mit: [Unit] Description=linuxmuster: switch local and remote home depending on ad server connection After=sssd.service funktioniert KEINE Anmeldung.

Was ist bei euch noch besonders, dass es funktioniert? (Bei mir wüsste ich diesbezüglich keine Abweichung von Standard.)

Gruß - Rainer

[kiarn]

Hi,

I made the tests as Rainer 2 weeks ago with the same result: sssd service was not active.

Arnaud

[ks98]

Hello, we have the problem that occasionally the drives are not mounted even though the login is successful. The problem is that I cannot reproduce it. Could it be the same problem or related?

[dorianim]

Hard to say without any logs. Could also be a network issue. The login works offline when the user was logged in on the workstation before.