[Freeipa-users] replication conflicts

Wed Jun 17 12:27:45 UTC 2015

Except:
"unable to decode: {replica 22} 5576b83e000200160000 5576ba4b000200160000
unable to decode: {replica 20} 55716e57000300140000 55716e57000300140000
unable to decode: {replica 16} 548a8126000000100000 548a8126000000100000
unable to decode: {replica 24} 557fb7d4000400180000 557fb9a1001000180000
unable to decode: {replica 21} 5576ac96000000150000 5576b52e000200150000"
records, all replicas are unique and have corresponding id's.
Total number of not "unable to decode" servers is equal to real number of replicas in domain.

I can confirm some of cleanallruv processes was not finished correctly after some replica remove.

Slapd on replica id 10 last restarted yesterday 15:05 server local time.

The same question, may it help if I tomorrow will do re-initialize all replicas from our relatively good-conditioned site?

WBR,
Alexander Frolushkin
Cell +79232508764
Work +79232507764

From: thierry bordaz [mailto:tbordaz at redhat.com]
Sent: Wednesday, June 17, 2015 6:16 PM
To: Alexander Frolushkin (SIB)
Cc: 'Ludwig Krispenz'; freeipa-users at redhat.com
Subject: Re: [Freeipa-users] replication conflicts

On 06/17/2015 01:38 PM, Alexander Frolushkin wrote:
Ok, I'll try this soon, thank you!
Also, please note, most of today dups appeared when 4 of 19 servers was very busy in IO (all our servers are VMs), because dirsrv debug was enabled to gather logs for our case about
attrlist_replace - attr_replace (nsslapd-referral, ldap://xxx-rhidm0x.unix.megafon.ru:389/o%3Dipaca) failed.

This message comes if you have duplicated ReplicaID. 'list-ruv' would show you a same url appearing several times with different RID.

To be back on the original problem (dup), I wonder if it is not related to cleanruv/corrupted RUV.

A new replica26 is created and is initialized from a master and it does not contain entry 555ac936000000140000. That allows the creation of
5580f3210000001a0000.
Then replica10 sends 555ac936000000140000 to replica26. That means that changelog/ruv of replica10 contained that update, so either cleanallruv20 did not happen on replica10 or fail to clean its CL.

Replica10 has a very old update that was not known from the master used to init replica26.
Was replica10 restarted recently.

thanks
theirry

errors
Also during collection some of dirsrv instances hangs and was restarted.

WBR,
Alexander Frolushkin
Cell +79232508764
Work +79232507764

From: Ludwig Krispenz [mailto:lkrispen at redhat.com]
Sent: Wednesday, June 17, 2015 5:34 PM
To: Alexander Frolushkin (SIB)
Cc: 'thierry bordaz'; freeipa-users at redhat.com<mailto:freeipa-users at redhat.com>
Subject: Re: [Freeipa-users] replication conflicts

On 06/17/2015 12:57 PM, Alexander Frolushkin wrote:
Unfortunately, number of duplicates grows dramatically on most sites. Some servers already have over 40 duplicates.
Could you please say, may I use re-initialize on falling replica from the good one to fix this?
If you have a good one, this should work, "dups" are only created when a replicated ADD is received for an existing entry.
But what really puzzles me is that you do not have them on all servers, something weird seems to happen, this entry seems to exist whit several replicaids, and why would replica 10 replicate this 4 hrs after the replica installation.

WBR,
Alexander Frolushkin
Cell +79232508764
Work +79232507764

From: Ludwig Krispenz [mailto:lkrispen at redhat.com]
Sent: Wednesday, June 17, 2015 4:35 PM
To: Alexander Frolushkin (SIB)
Cc: 'thierry bordaz'; freeipa-users at redhat.com<mailto:freeipa-users at redhat.com>
Subject: Re: [Freeipa-users] replication conflicts

conn=237 is from 10.99.75.82 which replica is this ?
On 06/17/2015 12:13 PM, Alexander Frolushkin wrote:
This is not a good news, because replica id 20 is not exist for a some days already. It was recreated and now have id 23

WBR,
Alexander Frolushkin
Cell +79232508764
Work +79232507764

From: thierry bordaz [mailto:tbordaz at redhat.com]
Sent: Wednesday, June 17, 2015 4:10 PM
To: Alexander Frolushkin (SIB)
Cc: 'Ludwig Krispenz'; freeipa-users at redhat.com<mailto:freeipa-users at redhat.com>
Subject: Re: [Freeipa-users] replication conflicts

On 06/17/2015 11:56 AM, Alexander Frolushkin wrote:
Will this be enough?

# grep "conn=237 op=93" ./access
[17/Jun/2015:14:39:46 +0600] conn=237 op=93 ADD dn="cn=System: Manage Host Keytab,cn=permissions,cn=pbac,dc=unix,dc=megafon,dc=ru"
[17/Jun/2015:14:39:46 +0600] conn=237 op=93 RESULT err=0 tag=105 nentries=0 etime=0 csn=555ac936000000140000
This operation is a replicated one and the CSN is from May 19th. So why a replica (26) created today was initialized without that entry ?
This updates was originated from replica20. Was it stopped and restarted recently ?

# grep "conn=293" ./access
[17/Jun/2015:15:33:04 +0600] conn=293 fd=75 slot=75 connection from 10.99.75.82 to 10.61.8.2
[17/Jun/2015:15:33:04 +0600] conn=293 op=0 BIND dn="" method=sasl version=3 mech=GSSAPI
[17/Jun/2015:15:33:04 +0600] conn=293 op=0 RESULT err=14 tag=97 nentries=0 etime=0, SASL bind in progress
[17/Jun/2015:15:33:04 +0600] conn=293 op=1 BIND dn="" method=sasl version=3 mech=GSSAPI
[17/Jun/2015:15:33:04 +0600] conn=293 op=1 RESULT err=14 tag=97 nentries=0 etime=0, SASL bind in progress
[17/Jun/2015:15:33:04 +0600] conn=293 op=2 BIND dn="" method=sasl version=3 mech=GSSAPI
[17/Jun/2015:15:33:04 +0600] conn=293 op=2 RESULT err=0 tag=97 nentries=0 etime=0 dn="krbprincipalname=ldap/msk-rhidm-03.unix.megafon.ru at unix.megafon.ru,cn=services,cn=accounts,dc=unix,dc=megafon,dc=ru"<mailto:krbprincipalname=ldap/msk-rhidm-03.unix.megafon.ru at unix.megafon.ru,cn=services,cn=accounts,dc=unix,dc=megafon,dc=ru>

WBR,
Alexander Frolushkin
Cell +79232508764
Work +79232507764

From: Ludwig Krispenz [mailto:lkrispen at redhat.com]
Sent: Wednesday, June 17, 2015 3:53 PM
To: thierry bordaz
Cc: Alexander Frolushkin (SIB); freeipa-users at redhat.com<mailto:freeipa-users at redhat.com>
Subject: Re: [Freeipa-users] replication conflicts

On 06/17/2015 11:45 AM, thierry bordaz wrote:

On 06/17/2015 11:22 AM, Alexander Frolushkin wrote:
This was a usual "ipa-replica-install --setup-ca --setup-dns" and after that ipa-adtrust-install.

No DEL found:
# grep "cn=System: Manage Host Keytab,cn=permissions,cn=pbac,dc=unix,dc=megafon,dc=ru" ./access
[17/Jun/2015:10:08:01 +0600] conn=2 op=89 SRCH base="cn=System: Manage Host Keytab,cn=permissions,cn=pbac,dc=unix,dc=megafon,dc=ru" scope=0 filter="(objectClass=*)" attrs="ipaPermRight ipaPermTargetFilter ipaPermBindRuleType ipaPermissionType cn objectClass memberOf member ipaPermTarget ipaPermDefaultAttr ipaPermLocation ipaPermIncludedAttr ipaPermExcludedAttr"
[17/Jun/2015:10:08:01 +0600] conn=2 op=91 ADD dn="cn=System: Manage Host Keytab,cn=permissions,cn=pbac,dc=unix,dc=megafon,dc=ru"

There is something I miss. conn=2 op=91 was a direct update on replica26 (not replicated) because it received its own CSN=5580f3210000001a0000. But it created a conflict entry, so at that time it existed the same entry (the one created 20150408070720Z) . So the direct update should have been rejected.
I think the search in op=89 did not return an entry, so it was added in op 91, that seems to be ok, but then 4 hrs later there is conn=237 adding it again.

Alexander,

could you get the complete 'conn=237 op=93' and also the start of conn 293, to show where teh connection comes from

Would you check if the replicaID=26 is unique in the topology (list-ruv for example) ?

[17/Jun/2015:14:39:46 +0600] conn=237 op=93 ADD dn="cn=System: Manage Host Keytab,cn=permissions,cn=pbac,dc=unix,dc=megafon,dc=ru"

It is also possible this entry on affected servers was previously duplicated and not correctly managed to delete (more recent dup was deleted).
Is there any natural way to fix such issues? Maybe ipa-replica-manage force-sync, or ipa-replica-manage re-initialize on affected site servers from normal servers could help?

WBR,
Alexander Frolushkin
Cell +79232508764
Work +79232507764

From: thierry bordaz [mailto:tbordaz at redhat.com]
Sent: Wednesday, June 17, 2015 3:15 PM
To: Alexander Frolushkin (SIB)
Cc: 'Ludwig Krispenz'; freeipa-users at redhat.com<mailto:freeipa-users at redhat.com>
Subject: Re: [Freeipa-users] replication conflicts

Hello Alexander,

How did you initialize that new replica 26.
Either 'cn=System: Manage Host Keytab,cn=permissions,cn=pbac,dc=unix,dc=megafon,dc=ru' was not part of the total init data, or a DEL of that entry happened on replica 26 (before a new ADD) but the DEL was not replicated to replica12.
Would you check in replica26 access logs if that entry was deleted ?

thanks
theirry

On 06/17/2015 11:03 AM, Alexander Frolushkin wrote:
This is correct, thank you for understanding and for helping!
Replica with id 26 was created today, this is our new server which was included in domain just a few hours ago. Looks like this dup came right after this new replica creation.

WBR,
Alexander Frolushkin
Cell +79232508764
Work +79232507764

From: Ludwig Krispenz [mailto:lkrispen at redhat.com]
Sent: Wednesday, June 17, 2015 2:58 PM
To: Alexander Frolushkin (SIB)
Cc: freeipa-users at redhat.com<mailto:freeipa-users at redhat.com>
Subject: Re: [Freeipa-users] replication conflicts

Hi,

you did send the data directly to me, maybe not wanting to share them to everyone. I'll continue discussion here, trying to be careful.

The "good" entry was created in April on replica 12 "0x0c"
createTimestamp;vucsn-5524d42b0067000c0000: 20150408070720Z

the "nsuniqueid" entry was created today on replica 26 "0x1a"
createTimestamp;vucsn-5580f3210000001a0000: 20150617040801Z

if the original entry would have existed on replica26 the new add should have been rejected, if it was not there the question is why.

Do you have any additional info on replica 26, when was it created, was it disconnected for some time ??

Ludwig
On 06/17/2015 08:13 AM, Alexander Frolushkin wrote:
Hello.
Another example. Today appeared on servers of different site.

Original LDIF:
# extended LDIF
#
# LDAPv3
# base <cn=System: Manage Host Keytab,cn=permissions,cn=pbac,dc=unix,dc=megafon,dc=ru> with scope subtree
# filter: (objectclass=*)
# requesting: ALL
#

# System: Manage Host Keytab, permissions, pbac, unix.megafon.ru
dn: cn=System: Manage Host Keytab,cn=permissions,cn=pbac,dc=unix,dc=megafon,dc
=ru
ipaPermTargetFilter: (objectclass=ipahost)
ipaPermRight: write
ipaPermBindRuleType: permission
ipaPermissionType: V2
ipaPermissionType: MANAGED
ipaPermissionType: SYSTEM
cn: System: Manage Host Keytab
objectClass: ipapermission
objectClass: top
objectClass: groupofnames
objectClass: ipapermissionv2
member: cn=Host Enrollment,cn=privileges,cn=pbac,dc=unix,dc=megafon,dc=ru
member: cn=Host Administrators,cn=privileges,cn=pbac,dc=unix,dc=megafon,dc=ru
ipaPermDefaultAttr: krbprincipalkey
ipaPermDefaultAttr: krblastpwdchange
ipaPermLocation: cn=computers,cn=accounts,dc=unix,dc=megafon,dc=ru

# search result
search: 2
result: 0 Success

# numResponses: 2
# numEntries: 1

Duplicate:
# extended LDIF
#
# LDAPv3
# base <cn=System: Manage Host Keytab+nsuniqueid=708bba65-14a611e5-8a48fd19-df27ff01,cn=permissions,cn=pbac,dc=unix,dc=megafon,dc=ru> with scope subtree
# filter: (objectclass=*)
# requesting: ALL
#

# System: Manage Host Keytab + 708bba65-14a611e5-8a48fd19-df27ff01, permissio
ns, pbac, unix.megafon.ru
dn: cn=System: Manage Host Keytab+nsuniqueid=708bba65-14a611e5-8a48fd19-df27ff
01,cn=permissions,cn=pbac,dc=unix,dc=megafon,dc=ru
ipaPermTargetFilter: (objectclass=ipahost)
ipaPermRight: write
ipaPermBindRuleType: permission
ipaPermissionType: V2
ipaPermissionType: MANAGED
ipaPermissionType: SYSTEM
cn: System: Manage Host Keytab
objectClass: ipapermission
objectClass: top
objectClass: groupofnames
objectClass: ipapermissionv2
member: cn=Host Enrollment,cn=privileges,cn=pbac,dc=unix,dc=megafon,dc=ru
member: cn=Host Administrators,cn=privileges,cn=pbac,dc=unix,dc=megafon,dc=ru
ipaPermDefaultAttr: krbprincipalkey
ipaPermDefaultAttr: krblastpwdchange
ipaPermLocation: cn=computers,cn=accounts,dc=unix,dc=megafon,dc=ru

# search result
search: 2
result: 0 Success

# numResponses: 2
# numEntries: 1

No other servers in IPA domain have such duplicates.

WBR,
Alexander Frolushkin
Cell +79232508764
Work +79232507764

From: freeipa-users-bounces at redhat.com<mailto:freeipa-users-bounces at redhat.com> [mailto:freeipa-users-bounces at redhat.com] On Behalf Of Ludwig Krispenz
Sent: Tuesday, June 16, 2015 3:52 PM
To: freeipa-users at redhat.com<mailto:freeipa-users at redhat.com>
Subject: Re: [Freeipa-users] replication conflicts

On 06/16/2015 11:42 AM, Alexander Frolushkin wrote:
Hello.
Just to remind if somebody still not familiar with our IPA installation :)
We currently have 18 IPA servers in domain, on 8 sites in different regions across the Russia.
And now, our new problem.
Regularly we getting a nsds5ReplConflict records on some of our servers, very often on servers from specific site. Usually it is simply a doubles and we can remove the renamed change to get everything back. But why do we have them at all?
May be someone could explain, how we can detect the cause of this replication conflicts?
if you are talking about having two "duplicate" entries,
one: uid=xxxxx,<suffix>
one: nsuniqueid=nnnnnnnn+uid=xxxxx,<suffix>

these entries appear if the entry uid=xxxxx was added, simultaneously, on two servers. I think this can happen if a client tries to add an entry and if it doesn't get a response in some time retries on another server.
to find out which client this is you need to check on which servers the entries were originally added and then see which client was doing it

Sometime it is moderately harmful, because, for example HBAC stops working on specific server while doubles still present.
Thanks in forward...

WBR,
Alexander Frolushkin
Cell +79232508764
Work +79232507764

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