Andrea Cucciarre'
2019-Jul-31 13:12 UTC
[Samba] winbind seems to hang when the DC goes down instead of switching to the other available DC
Hello, I'm running Samba 4.9.5 as domain member, when I bring down the current Window DC (10.50.50.187) the winbind seems to hang instead of switching to the other available DC (10.50.50.25) The "net ads" command show that Samba switched to the other available DC: net ads join -U 'administrator' -S 'PAVONE.HYPERFILE.LOCAL' 'HYPERFILE.LOCAL'^C root at epsilon64:/opt/samba/log# net ads info LDAP server: 10.50.50.25 LDAP server name: pavone.hyperfile.local Realm: HYPERFILE.LOCAL Bind Path: dc=HYPERFILE,dc=LOCAL LDAP port: 389 Server time: Wed, 31 Jul 2019 14:50:44 CEST KDC server: 10.50.50.25 Server time offset: 0 Last machine account password change: Wed, 31 Jul 2019 14:37:34 CEST root at epsilon64:/opt/samba/log# wbinfo --ping-dc checking the NETLOGON for domain[HYPERFILE] dc connection to "" failed failed to call wbcPingDc: WBC_ERR_WINBIND_NOT_AVAILABLE however wbinfo --ping-dc fails: ?wbinfo --ping-dc checking the NETLOGON for domain[HYPERFILE] dc connection to "" failed failed to call wbcPingDc: WBC_ERR_WINBIND_NOT_AVAILABLE Hereafter the relevant logs, it seems that winbindd realized that the DC is down and it can use the other one (10.50.50.25), but it fails to connect [2019/07/31 14:51:11.362303, 11, pid=7139, effective(0, 0), real(0, 0), class=winbind] ../source3/winbindd/winbindd_util.c:2006(winbindd_set_locator_kdc_env) ? winbindd_set_locator_kdc_env: setting var: WINBINDD_LOCATOR_KDC_ADDRESS_HYPERFILE.LOCAL to: 10.50.50.25 [2019/07/31 14:51:11.362398,? 3, pid=7139, effective(0, 0), real(0, 0)] ../source3/libsmb/cliconnect.c:272(cli_session_creds_prepare_krb5) ? got OID=1.3.6.1.4.1.311.2.2.30 ? got OID=1.2.840.48018.1.2.2 [2019/07/31 14:51:11.362540, 10, pid=7139, effective(0, 0), real(0, 0)] ../source3/libads/kerberos.c:141(kerberos_kinit_password_ext) ? kerberos_kinit_password: as EPSILON64$@HYPERFILE.LOCAL using [MEMORY:cliconnect] as ccache and config [/opt/samba/var/lock/smb_krb5/krb5.conf.HYPERFILE] [2019/07/31 14:51:11.816828,? 5, pid=7139, effective(0, 0), real(0, 0), class=auth] ../auth/gensec/gensec_start.c:739(gensec_start_mech) ? Starting GENSEC mechanism spnego [2019/07/31 14:51:11.816989,? 5, pid=7139, effective(0, 0), real(0, 0), class=auth] ../auth/gensec/gensec_start.c:739(gensec_start_mech) ? Starting GENSEC submechanism gse_krb5 [2019/07/31 14:58:36.719216, 10, pid=7139, effective(0, 0), real(0, 0), class=auth] ../auth/gensec/gensec.c:440(gensec_update_send) ? gensec_update_send: gse_krb5[8197c98]: subreq: 819e628 [2019/07/31 14:58:36.719316, 10, pid=7139, effective(0, 0), real(0, 0), class=auth] ../auth/gensec/gensec.c:440(gensec_update_send) ? gensec_update_send: spnego[819ca68]: subreq: 819bb50 [2019/07/31 14:58:36.719358, 10, pid=7139, effective(0, 0), real(0, 0), class=auth] ../auth/gensec/gensec.c:498(gensec_update_done) ? gensec_update_done: gse_krb5[8197c98]: NT_STATUS_MORE_PROCESSING_REQUIRED tevent_req[819e628/../source3/librpc/crypto/gse.c:841]: state[2] error[0 (0x0)]? state[struct gensec_gse_update_state (819e708)] timer[0] finish[../source3/librpc/crypto/gse.c:851] [2019/07/31 14:58:36.719424, 10, pid=7139, effective(0, 0), real(0, 0), class=auth] ../auth/gensec/gensec.c:498(gensec_update_done) ? gensec_update_done: spnego[819ca68]: NT_STATUS_MORE_PROCESSING_REQUIRED tevent_req[819bb50/../auth/gensec/spnego.c:1601]: state[2] error[0 (0x0)]? state[struct gensec_spnego_update_state (819bc30)] timer [0] finish[../auth/gensec/spnego.c:2070] [2019/07/31 14:58:36.719886,? 3, pid=7139, effective(0, 0), real(0, 0)] ../source3/libsmb/cliconnect.c:1679(cli_session_setup_creds_done_spnego) ? SPNEGO login failed: The transport connection is now disconnected. I have looked at the stack of that winbindd pid and ti seems it's hung connecting to the old DC (10.50.50.187) which is down : root at epsilon64:/opt/samba/log# pstack 7139 7139:?? /opt/samba/sbin/winbindd --daemon ?fc8f0ec5 connect? (1b, 819d780, 10, 1) ?fee5c2bb connect? (1b, 819d780, 10, fe2363f0) + 23 ?fe2365a0 krb5_sendto (819cd78, 80451fc, 8197f38, 80451f4) + 1bd ?fe236b36 krb5_sendto_context (819cd78, 819af70, 80451fc, 819d810, 80451f4, fe236c2d) + 12c ?fe2152d7 get_cred_kdc (819cd78, 819b330, 6, 0, 80453a4, 8198258) + 490 ?fe2156bc krb5_get_kdc_cred (819cd78, 819b330, 6, 0, 0, 80453a4) + ce ?fe2177f1 krb5_get_forwarded_creds (819cd78, 819bd90, 819b330, 6, 81806a8, 80453a4) + 1b0 ?fee07c0f do_delegation (819cd78, 819bd90, 819b330, 8197ee8, 819b0d8, 804543c) + f9 ?fee0809b init_auth_restart (80455f4, 8199498, 819a210, 819cd78, 802e, 0) + 139 ?fee089d5 _gsskrb5_init_sec_context (80455f4, 8199498, 818af1c, 819b018, 819a1f4, 802e) + 1e8 ... # pfiles 7139 7139:?? /opt/samba/sbin/winbindd --daemon ?... ? 27: S_IFSOCK mode:0666 dev:538,0 ino:32677 uid:0 gid:0 rdev:0,0 ????? O_RDWR FD_CLOEXEC ??????? SOCK_STREAM ??????? SO_SNDBUF(49152),SO_RCVBUF(128480) ??????? sockname: AF_INET 10.50.50.10? port: 48405 # netstat -an | grep 46793 10.50.50.10.46793??? 10.50.50.187.88????????? 0????? 0 128480????? 0 SYN_SENT The issue can be recovered by restarting the winbindd. Hereafter the smb.conf: =======[global] client ldap sasl wrapping = plain dedicated keytab file = /etc/krb5.keytab disable spoolss = yes host msdfs = no idmap config * : backend = tdb idmap config * : range = 30000-40000 idmap config * : schema_mode = rfc2307 idmap config HYPERFILE : backend = rid idmap config HYPERFILE : range = 1000000-20000000 idmap config HYPERFILE : schema_mode = rfc2307 idmap config HYPERLOOP : backend = rid idmap config HYPERLOOP : range = 20000001-30000000 idmap config HYPERLOOP : schema_mode = rfc2307 kerberos method = secrets and keytab load printers = no local master = no log file = /opt/samba/log/%m.log log level = 11 map acl inherit = Yes map to guest = bad user max log size = 100000 os level = 3 preferred master = no printcap name = /dev/null realm = HYPERFILE.LOCAL security = ads server string = Data %h store dos attributes = Yes vfs objects = zfsacl winbind enum groups = yes winbind enum users = yes winbind expand groups = 0 winbind nested groups = yes winbind normalize names = no winbind nss info = rfc2307 winbind refresh tickets = Yes winbind use default domain = no workgroup = HYPERFILE ========= Is it a bug or can you advice about what could be wrong in my config? Thanks Andrea
Marco Gaiarin
2019-Jul-31 13:41 UTC
[Samba] winbind seems to hang when the DC goes down instead of switching to the other available DC
Mandi! Andrea Cucciarre' via samba In chel di` si favelave...> I'm running Samba 4.9.5 as domain member, when I bring down the current > Window DC (10.50.50.187) the winbind seems to hang instead of switching to > the other available DC (10.50.50.25)I'm experimenting the exact behaviour, using 4.8.12-1~deb9 as DM and samba 4.5.16+nmu-1.1~deb8 as DC. When i reboot a DC, and winbind is currently connected to that DC, winbind for a little amount of time respond 'user not found'. The strange things is exactly whay you say: seems that winbind 'stall' until the (rebooting) DC come back, then switch DC; so if, i have to reboot all DC, i trigger this n-times... -- dott. Marco Gaiarin GNUPG Key ID: 240A3D66 Associazione ``La Nostra Famiglia'' http://www.lanostrafamiglia.it/ Polo FVG - Via della Bont?, 7 - 33078 - San Vito al Tagliamento (PN) marco.gaiarin(at)lanostrafamiglia.it t +39-0434-842711 f +39-0434-842797 Dona il 5 PER MILLE a LA NOSTRA FAMIGLIA! http://www.lanostrafamiglia.it/index.php/it/sostienici/5x1000 (cf 00307430132, categoria ONLUS oppure RICERCA SANITARIA)
L.P.H. van Belle
2019-Aug-01 07:18 UTC
[Samba] winbind seems to hang when the DC goes down instead of switching to the other available DC
This is strange and should not happen. Verify if all DC's are also available as NS record in the DNS on the zones. Startup the DNS tool. Goto you primary dnszone ( and repeat for all other zones ) Do you see all your DC's as NS record in the zone, then its ok, if not.. Klik and Properties on the zone, goto Tab "Nameservers", add the other dc's. You can also try these settings in resolv.conf options edns0 options timeout:1 options attempts:2 Greetz, Louis> -----Oorspronkelijk bericht----- > Van: samba [mailto:samba-bounces at lists.samba.org] Namens > Marco Gaiarin via samba > Verzonden: woensdag 31 juli 2019 15:41 > Aan: samba at lists.samba.org > Onderwerp: Re: [Samba] winbind seems to hang when the DC goes > down instead of switching to the other available DC > > Mandi! Andrea Cucciarre' via samba > In chel di` si favelave... > > > I'm running Samba 4.9.5 as domain member, when I bring down > the current > > Window DC (10.50.50.187) the winbind seems to hang instead > of switching to > > the other available DC (10.50.50.25) > > I'm experimenting the exact behaviour, using 4.8.12-1~deb9 as DM and > samba 4.5.16+nmu-1.1~deb8 as DC. > > When i reboot a DC, and winbind is currently connected to that DC, > winbind for a little amount of time respond 'user not found'. > > > The strange things is exactly whay you say: seems that winbind 'stall' > until the (rebooting) DC come back, then switch DC; so if, i have to > reboot all DC, i trigger this n-times... > > -- > dott. Marco Gaiarin GNUPG > Key ID: 240A3D66 > Associazione ``La Nostra Famiglia'' > http://www.lanostrafamiglia.it/ > Polo FVG - Via della Bont?, 7 - 33078 - San Vito al > Tagliamento (PN) > marco.gaiarin(at)lanostrafamiglia.it t +39-0434-842711 > f +39-0434-842797 > > Dona il 5 PER MILLE a LA NOSTRA FAMIGLIA! > http://www.lanostrafamiglia.it/index.php/it/sostienici/5x1000 > (cf 00307430132, categoria ONLUS oppure RICERCA SANITARIA) > > -- > To unsubscribe from this list go to the following URL and read the > instructions: https://lists.samba.org/mailman/options/samba > >
Andrea Cucciarre'
2019-Aug-01 15:12 UTC
[Samba] winbind seems to hang when the DC goes down instead of switching to the other available DC
I have checked the DNS configuration as you recommended, and run more tests. It seems that winbidndd recover itself within about 10 minutes after the DC has been shutdown, not sure where that sort of timeout comes from :( # sleep 60; while true; do date; wbinfo -u; sleep 60; done Thu Aug? 1 16:39:32 CEST 2019 HYPERFILE\guest HYPERFILE\defaultaccount HYPERFILE\krbtgt HYPERFILE\administrator HYPERFILE\pannibale HYPERFILE\samba_test HYPERFILE\emanuel HYPERFILE\andrea HYPERFILE\nick Thu Aug? 1 16:40:32 CEST 2019 HYPERFILE\guest HYPERFILE\defaultaccount HYPERFILE\krbtgt HYPERFILE\administrator HYPERFILE\pannibale HYPERFILE\samba_test HYPERFILE\emanuel HYPERFILE\andrea HYPERFILE\nick Thu Aug? 1 16:41:32 CEST 2019 Error looking up domain users Thu Aug? 1 16:43:34 CEST 2019 Error looking up domain users Thu Aug? 1 16:45:39 CEST 2019 Error looking up domain users Thu Aug? 1 16:47:44 CEST 2019 Error looking up domain users Thu Aug? 1 16:49:49 CEST 2019 HYPERFILE\administrator HYPERFILE\guest HYPERFILE\defaultaccount HYPERFILE\krbtgt HYPERFILE\pannibale HYPERFILE\samba_test HYPERFILE\emanuel HYPERFILE\andrea HYPERFILE\nick Thu Aug? 1 16:50:49 CEST 2019 HYPERFILE\administrator HYPERFILE\guest HYPERFILE\defaultaccount HYPERFILE\krbtgt HYPERFILE\pannibale HYPERFILE\samba_test HYPERFILE\emanuel HYPERFILE\andrea HYPERFILE\nick Il 8/1/2019 9:18 AM, L.P.H. van Belle via samba ha scritto:> This is strange and should not happen. > > Verify if all DC's are also available as NS record in the DNS on the zones. > Startup the DNS tool. > > Goto you primary dnszone ( and repeat for all other zones ) > Do you see all your DC's as NS record in the zone, then its ok, if not.. > > Klik and Properties on the zone, goto Tab "Nameservers", add the other dc's. > > You can also try these settings in resolv.conf > > options edns0 > options timeout:1 > options attempts:2 > > Greetz, > > Louis > > > >> -----Oorspronkelijk bericht----- >> Van: samba [mailto:samba-bounces at lists.samba.org] Namens >> Marco Gaiarin via samba >> Verzonden: woensdag 31 juli 2019 15:41 >> Aan: samba at lists.samba.org >> Onderwerp: Re: [Samba] winbind seems to hang when the DC goes >> down instead of switching to the other available DC >> >> Mandi! Andrea Cucciarre' via samba >> In chel di` si favelave... >> >>> I'm running Samba 4.9.5 as domain member, when I bring down >> the current >>> Window DC (10.50.50.187) the winbind seems to hang instead >> of switching to >>> the other available DC (10.50.50.25) >> I'm experimenting the exact behaviour, using 4.8.12-1~deb9 as DM and >> samba 4.5.16+nmu-1.1~deb8 as DC. >> >> When i reboot a DC, and winbind is currently connected to that DC, >> winbind for a little amount of time respond 'user not found'. >> >> >> The strange things is exactly whay you say: seems that winbind 'stall' >> until the (rebooting) DC come back, then switch DC; so if, i have to >> reboot all DC, i trigger this n-times... >> >> -- >> dott. Marco Gaiarin GNUPG >> Key ID: 240A3D66 >> Associazione ``La Nostra Famiglia'' >> http://www.lanostrafamiglia.it/ >> Polo FVG - Via della Bont?, 7 - 33078 - San Vito al >> Tagliamento (PN) >> marco.gaiarin(at)lanostrafamiglia.it t +39-0434-842711 >> f +39-0434-842797 >> >> Dona il 5 PER MILLE a LA NOSTRA FAMIGLIA! >> http://www.lanostrafamiglia.it/index.php/it/sostienici/5x1000 >> (cf 00307430132, categoria ONLUS oppure RICERCA SANITARIA) >> >> -- >> To unsubscribe from this list go to the following URL and read the >> instructions: https://lists.samba.org/mailman/options/samba >> >> >
Marco Gaiarin
2019-Aug-02 10:37 UTC
[Samba] winbind seems to hang when the DC goes down instead of switching to the other available DC
Mandi! L.P.H. van Belle via samba In chel di` si favelave...> Verify if all DC's are also available as NS record in the DNS on the zones. > Startup the DNS tool. > Goto you primary dnszone ( and repeat for all other zones ) > Do you see all your DC's as NS record in the zone, then its ok, if not..Do you mean the 'domain' zone and the '_msdcs.' zone? Yes, both have all the DCs listed.> You can also try these settings in resolv.conf > options edns0 > options timeout:1 > options attempts:2Added. I'll do some more tests when back from holyday. Anyway, the first resolver listed is 'localhost' (that is, indeed, the main DNS resolver); the local/main resolver have the AD domain as a subzone, with correct resolver defined. Better to have a 'forward zone' defined? -- dott. Marco Gaiarin GNUPG Key ID: 240A3D66 Associazione ``La Nostra Famiglia'' http://www.lanostrafamiglia.it/ Polo FVG - Via della Bont?, 7 - 33078 - San Vito al Tagliamento (PN) marco.gaiarin(at)lanostrafamiglia.it t +39-0434-842711 f +39-0434-842797 Dona il 5 PER MILLE a LA NOSTRA FAMIGLIA! http://www.lanostrafamiglia.it/index.php/it/sostienici/5x1000 (cf 00307430132, categoria ONLUS oppure RICERCA SANITARIA)
L.P.H. van Belle
2019-Aug-02 12:08 UTC
[Samba] winbind seems to hang when the DC goes down instead of switching to the other available DC
Hai Marco,
Yes, best is to use the "localhost" dns setup as caching/forwarder
only.
All you need is for the forwarding is :
zone "your.dnsdomain.tld" {
type forward;
forwarders { IP_DC1; IP_DC2; };
};
zone "168.192.in-addr.arpa" {
type forward;
forwarders { IP_DC1; IP_DC2; };
};
If you think its still to slow, remove > options attempts:2
Or set > options attempts:1
Greetz,
Louis
> -----Oorspronkelijk bericht-----
> Van: samba [mailto:samba-bounces at lists.samba.org] Namens
> Marco Gaiarin via samba
> Verzonden: vrijdag 2 augustus 2019 12:38
> Aan: samba at lists.samba.org
> Onderwerp: Re: [Samba] winbind seems to hang when the DC goes
> down instead of switching to the other available DC
>
> Mandi! L.P.H. van Belle via samba
> In chel di` si favelave...
>
> > Verify if all DC's are also available as NS record in the
> DNS on the zones.
> > Startup the DNS tool.
> > Goto you primary dnszone ( and repeat for all other zones )
> > Do you see all your DC's as NS record in the zone, then its
> ok, if not..
>
> Do you mean the 'domain' zone and the '_msdcs.' zone? Yes,
both have
> all the DCs listed.
>
>
> > You can also try these settings in resolv.conf
> > options edns0
> > options timeout:1
> > options attempts:2
>
> Added. I'll do some more tests when back from holyday.
>
> Anyway, the first resolver listed is 'localhost' (that is, indeed,
the
> main DNS resolver); the local/main resolver have the AD domain as a
> subzone, with correct resolver defined.
>
> Better to have a 'forward zone' defined?
>
> --
> dott. Marco Gaiarin GNUPG
> Key ID: 240A3D66
> Associazione ``La Nostra Famiglia''
> http://www.lanostrafamiglia.it/
> Polo FVG - Via della Bont?, 7 - 33078 - San Vito al
> Tagliamento (PN)
> marco.gaiarin(at)lanostrafamiglia.it t +39-0434-842711
> f +39-0434-842797
>
> Dona il 5 PER MILLE a LA NOSTRA FAMIGLIA!
> http://www.lanostrafamiglia.it/index.php/it/sostienici/5x1000
> (cf 00307430132, categoria ONLUS oppure RICERCA SANITARIA)
>
> --
> To unsubscribe from this list go to the following URL and read the
> instructions: https://lists.samba.org/mailman/options/samba
>
>
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