[Freeipa-users] Replication woes
JR Aquino
JR.Aquino at citrix.com
Tue Aug 20 16:10:58 UTC 2013
On Aug 20, 2013, at 6:46 AM, Rich Megginson <rmeggins at redhat.com<mailto:rmeggins at redhat.com>> wrote:
On 08/20/2013 05:55 AM, Bret Wortman wrote:
Okay, now I'm thinking I need to dump all my replicas and start them fresh. My /var/log/slapd-FOO-COM/errors is filled with messages like this:
NSMMReplicationPlugin - changelog program - agmt="cn=meTogood1.foo.com<http://metogood1.foo.com/>" (good1:389): CSN 520a49640000001d0000 not found, we aren't as up to date, or we purged
agmt="cn=meTogood1.foo.com<http://metogood1.foo.com/>" (good1:389) - Can't locate CSN 520a49640000001d0000 in the changelog (DB rc=-30988). The consumer may need to be reinitialized.
I assume the "consumer" is the replica, right? At present, I have two replicas known to my master that are simply gone. Another is there but they can't talk. Three more have good communication but I'm getting errors like these. Is there a good, clean way to just clobber all the replicas and start over without trashing the DNS and other identity data that is inside my master and which is working? Deleting them from the master hasn't been working; it tends to hang the master's DNS and other services until I Ctrl-C out and "ipactl restart" it.
I'm afraid to venture out without a net here and make things worse....
This looks like https://fedorahosted.org/389/ticket/47386
We've never been able to reproduce this in a "controlled" environment.
The original reporter has been able to get this to work in some cases by restarting ipa (ipactl restart).
Before you do that, would you be able to provide some information for me?
On the supplier and consumer:
ldapsearch -xLLL -D "cn=directory manager" -W -b "dc=FOO,dc=COM" '(&(objectclass=nstombstone)(nsuniqueid=ffffffff-ffffffff-ffffffff-ffffffff))' > ruv.ldif
ldapsearch -xLLL -D "cn=directory manager" -W -b "cn=config" '(objectclass=nsds5replicationagreement)' > agmt.ldif
dbscan -f /var/lib/dirsrv/slapd-FOO-COM/cldb/*.db4 | head -200 > cldb.txt
Be sure to obscure any sensitive data in ruv.ldif, agmt.ldif, and cldb.txt - you can either attach to https://fedorahosted.org/389/ticket/47386 or email to me directly.
Any help you could provide in capturing the fail-state would be hugely appreciated.
I've found that if you work through the issue and fix the problem, it doesn't appear to be deliberately reproducible.
If you can get the debugging data that Rich needs, I can work on drafting you a basic howto on how to diagnose and fix your replication issue.
Bret Wortman
[http://damascusgrp.com/item/51f7de33e4b08d2bdb8b4860?format=1500w]
http://damascusgrp.com/
http://about.me/wortmanbret
On Mon, Aug 19, 2013 at 2:21 PM, Bret Wortman <bret.wortman at damascusgrp.com<mailto:bret.wortman at damascusgrp.com>> wrote:
On my master (where this error is occurring), I've got, in /etc/hosts:
127.0.0.1 localhost localhost.localdomain
::1 localhost localhost.localdomain
1.2.3.4 ipamaster.foo.net<http://ipamaster.foo.net/> ipamaster
So that should be okay, right?
# host ipamaster.foo.net<http://ipamaster.foo.net/>
ipamaster.foo.net<http://ipamaster.foo.net/> has address 1.2.3.4
# host ipamaster
ipamaster.foo.net<http://ipamaster.foo.net/> has address 1.2.3.4
# host localhost
localhost has address 127.0.0.1
localhost has IPv6 address ::1
#
I checked the other system (the one I can't connect to) to be safe, and its /etc/hosts is similarly configured. It even has the master listed with its correct IP address.
Bret Wortman
[http://damascusgrp.com/item/51f7de33e4b08d2bdb8b4860?format=1500w]
http://damascusgrp.com/
http://about.me/wortmanbret
On Mon, Aug 19, 2013 at 2:02 PM, Simo Sorce <simo at redhat.com<mailto:simo at redhat.com>> wrote:
On Mon, 2013-08-19 at 13:51 -0400, Bret Wortman wrote:
> So, any idea how to fix the Kerberos problem?
>
If your server is trying to get a tgt for ldap/localhost it probably
means your /etc/hosts file is broken and has a line like this:
1.2.3.4 localhost my.real.name<http://my.real.name/>
When GSSAPI tries to resolve my.realm.name<http://my.realm.name/> it gets back that 'localhost'
is the canonical name so it tries to get a TGT with that name and it
fails.
If /etc/host sis fine then the DNS server may be returning an IP address
that later resolves to localhost again.
To unbreak make sure that if you have your fully qualified name
in /etc/hosts that it is on its own line pointing at the right IP
address and where the FQDN name is the first in line:
eg:
this is ok:
1.2.3.4 server.full.name<http://server.full.name/> server
this is not:
1.2.3.4 server server.full.name<http://server.full.name/>
Simo.
>
> Bret Wortman
>
>
> http://damascusgrp.com/
>
> http://about.me/wortmanbret
>
>
>
> On Mon, Aug 19, 2013 at 12:19 PM, Bret Wortman
> <bret.wortman at damascusgrp.com<mailto:bret.wortman at damascusgrp.com>> wrote:
> ...and I got the web UI, authentication and sudo back via:
>
>
> # ipactl stop
> # ipactl start
>
>
> Not sure why that worked, but it did. I was grasping at
> straws, honestly.
>
>
>
>
>
> Bret Wortman
>
>
> http://damascusgrp.com/
>
> http://about.me/wortmanbret
>
>
>
>
> On Mon, Aug 19, 2013 at 12:18 PM, Bret Wortman
> <bret.wortman at damascusgrp.com<mailto:bret.wortman at damascusgrp.com>> wrote:
> Digging further, I think this log entry might be the
> problem between the two servers that aren't talking:
>
>
> slapd_ldap_sasl_interactive_bind - Error: could not
> perform interactive bind for id[] mech [GSSAPI]: LDAP
> error -2 (Local error) (SASL(-1): generic failure:
> GSSAPI Error: Unspecified GSS failure. Minor code may
> provide more information (Server
> ldap/localhost at SPX.NET<mailto:localhost at SPX.NET> not found in Kerberos
> database)) errno 2 (No such file or directory)
>
>
> Did I build something incorrectly when that server was
> set up originally?
>
>
>
>
>
>
>
> Bret Wortman
>
>
> http://damascusgrp.com/
>
> http://about.me/wortmanbret
>
>
>
>
> On Mon, Aug 19, 2013 at 12:02 PM, Bret Wortman
> <bret.wortman at damascusgrp.com<mailto:bret.wortman at damascusgrp.com>> wrote:
> I ran it on a good master, against a bad one.
> As in, I ran this command on my master IPA
> node:
>
>
> # ipa-replica-manage del --force bad1.foo.net<http://bad1.foo.net/>
> --cleanup
>
>
> Was that wrong? I was trying to delete the bad
> replica from the master, so I figured the
> command needed to be run on the master. But
> again, my master is now in a state where it's
> not resolving DNS, user logins, or sudo at the
> very least.
>
>
> Oh, and I checked the node that it was
> complaining about earlier. The network
> connection to it is the pits, but it's there.
> And it resolves.
>
>
>
>
>
> Bret Wortman
>
>
> http://damascusgrp.com/
>
> http://about.me/wortmanbret
>
>
>
> On Mon, Aug 19, 2013 at 11:58 AM, Rob
> Crittenden <rcritten at redhat.com<mailto:rcritten at redhat.com>> wrote:
> Rob Crittenden wrote:
> Bret Wortman wrote:
> Well, my master ground
> to a halt and wasn't
> responding. I rebooted
> the
> system and now I can't
> access the web UI or
> ssh to the master
> either. I
> have console access
> but that's it.
>
> The services all say
> they're running, but
> the web UI gives an
> "Unknown
> Error" dialog and ssh
> fails with
> "ssh_exchange_identification:
> Connection closed by
> remote host" whenever
> I try to ssh to
> ipamaster. I
> think something has
> gone really wrong
> inside my master. Any
> ideas? Even
> after the reboot,
> --cleanup isn't
> helping and just
> hangs.
>
> The logfiles end (as
> of the time I ^C'd the
> process) with:
>
> NSMMReplicationPlugin
> -
> agmt="cn=meTogood3.spx.net<http://metogood3.spx.net/>
> <http://meTogood3.spx.net<http://metogood3.spx.net/>>" (good3:389): Replication bind with GSSAPI
> auth failed: LDAP
> error -2 (Local error)
> (SASL(-1): generic
> failure:
> GSSAPI Error:
> Unspecified GSS
> failure. Minor code
> may provide more
> information (Cannot
> determine realm for
> numeric host address))
> NSMMReplicationPlugin
> - CleanAllRUV Task:
> Replica not online
> (agmt="cn=meTogood3.foo.net<http://metogood3.foo.net/> <http://meTogood3.foo.net<http://metogood3.foo.net/>>" (good3:389))
> NSMMReplicationPlugin
> - CleanAllRUV Task:
> Not all replicas
> online,
> retrying in 160
> seconds...,
>
> So it looks like it's
> having trouble talking
> with one of my
> replicas and
> is doggedly trying to
> get the job done. Any
> idea how to get the
> master
> back working again
> while I troubleshoot
> this connectivity
> issue?
>
> That suggests a DNS problem,
> and it might explain ssh as
> well depending
> on your configuration.
>
>
> To be clear, you ran --cleanup against
> one of the bad masters, not a good
> one, right?
>
> rob
>
>
>
>
>
>
>
>
>
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--
Simo Sorce * Red Hat, Inc * New York
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