4:21 a.m.
Because this is so unexpected and it impacts OpenLDAP installations, I
though I share this information here.
Ubuntu server upgrade from 12.04 to 14.04 LTS will purge the OpenLDAP
directory data. I don't understand why the or a upgrade would want to
purge data but that is what happens. I can't find anything on the internet
explaining why this is unavoidable and necessary.
From what I have learned so far the best way to recover from this is
to
completly remove OpenLDAP and start a fresh installation and import data
from backup. I'm sure you will have it, for exactly this types of
situations that are I'm afraid typical for OpenLDAP.
The reason is that it is unclear what state the upgrade leaves OpenLDAP in.
I think it will take more time to figure out what was purged, what not,
what was changed than it takes to do a complete reinstall.
6:10 a.m.
On Sun, 2014-12-21 at 13:21 +0100, Onno van der Straaten wrote:
Because this is so unexpected and it impacts OpenLDAP installations,
I
though I share this information here.
Ubuntu server upgrade from 12.04 to 14.04 LTS will purge the OpenLDAP
directory data. I don't understand why the or a upgrade would want to
purge data but that is what happens. I can't find anything on the
internet explaining why this is unavoidable and necessary.
From what I have learned so far the best way to recover from this is
to completly remove OpenLDAP and start a fresh installation and import
data from backup. I'm sure you will have it, for exactly this types of
situations that are I'm afraid typical for OpenLDAP.
The reason is that it is unclear what state the upgrade leaves
OpenLDAP in. I think it will take more time to figure out what was
purged, what not, what was changed than it takes to do a complete
reinstall.
stab in the dark. is there an update to the filesystems used (ext3/4 to
xfs or something)?
9:50 a.m.
On Sun, Dec 21, 2014 at 01:21:21PM +0100, Onno van der Straaten wrote:
Because this is so unexpected and it impacts OpenLDAP installations,
I
though I share this information here.
Ubuntu server upgrade from 12.04 to 14.04 LTS will purge the OpenLDAP
directory data.
That would be a severe bug in the Ubuntu package. If you can reproduce
this (for example, by restoring a backup and repeating the upgrade),
please file a Launchpad bug ('ubuntu-bug slapd'), and we can discuss it
there, since Ubuntu packaging bugs are off-topic for this list.
2:14 p.m.
Florian Weimer wrote:
* Onno van der Straaten:
> Ubuntu server upgrade from 12.04 to 14.04 LTS will purge the OpenLDAP
> directory data.
Is there an Ubuntu bug for this behavior? It's a bit odd.
One should generally be careful with system upgrades.
AFAIK on-disk-format might change because of Berkeley-DB version upgrade.
But without knowing about the backend configuration used it's impossible to
track this down.
Ciao, Michael. (not an Ubuntu user)
2:56 p.m.
At Sun, 21 Dec 2014 23:14:42 +0100 [** ISO-8859-1 charset **] Michael
Ströder<michael(a)stroeder.com> wrote:
Florian Weimer wrote:
> * Onno van der Straaten:
>
>> Ubuntu server upgrade from 12.04 to 14.04 LTS will purge the OpenLDAP
>> directory data.
>
> Is there an Ubuntu bug for this behavior? It's a bit odd.
One should generally be careful with system upgrades.
Esp. major version jumps.
AFAIK on-disk-format might change because of Berkeley-DB version upgrade.
Which suggests that one needs to dump the 12.04 database (to ldif text format)
and then reload it into the fresh 14.04 database.
(This is what I did when I upgraded a old server running CentOS 5 to a new
server running CentOS 6.)
But without knowing about the backend configuration used it's impossible to
track this down.
This is the reason *RedHat* Enterprise Linux is never recomended to do
upgrades across major versions. The recomended practice is allways a fresh
install. (Of course, RHEL has a much longer lifetime and package APIs
generally make a *big* jump.) Ubuntu has a shorter life span, so things
*generally* don't make such a big jump, but it looks like that is not always
the case.
Ciao, Michael. (not an Ubuntu user)
--
Robert Heller -- 978-544-6933
Deepwoods Software -- Custom Software Services
http://www.deepsoft.com/ -- Linux Administration Services
heller(a)deepsoft.com -- Webhosting Services
12:29 a.m.
* Robert Heller:
This is the reason *RedHat* Enterprise Linux is never recomended to
do
upgrades across major versions. The recomended practice is allways a fresh
install.
That's mostly because Red Hat does not want to support such
installations of unknown genealogy. Technically, in-place upgrades
for most systems work, as long as you take care of the usual offenders
(e.g., Berkeley DB, as Michael pointed out, and PostgreSQL).
12:27 a.m.
* Michael Ströder:
Florian Weimer wrote:
> * Onno van der Straaten:
>
>> Ubuntu server upgrade from 12.04 to 14.04 LTS will purge the OpenLDAP
>> directory data.
>
> Is there an Ubuntu bug for this behavior? It's a bit odd.
One should generally be careful with system upgrades.
AFAIK on-disk-format might change because of Berkeley-DB version upgrade.
Unless OpenLDAP uses the HASH database type, it's sufficient to
checkpoint the Berkeley DB environment (and perhaps some other
undocumented magic) *before* updating OpenLDAP. The on-disk format of
B-Tree-type databases is quite stable.
(Automated dump and reload might not work for large databases during
automated package upgrades because of the time and disk space
overhead.)
9:21 a.m.
Florian Weimer wrote:
* Michael Ströder:
> Florian Weimer wrote:
>> * Onno van der Straaten:
>>
>>> Ubuntu server upgrade from 12.04 to 14.04 LTS will purge the OpenLDAP
>>> directory data.
>>
>> Is there an Ubuntu bug for this behavior? It's a bit odd.
>
> One should generally be careful with system upgrades.
>
> AFAIK on-disk-format might change because of Berkeley-DB version upgrade.
Unless OpenLDAP uses the HASH database type, it's sufficient to
checkpoint the Berkeley DB environment (and perhaps some other
undocumented magic) *before* updating OpenLDAP. The on-disk format of
B-Tree-type databases is quite stable.
(Automated dump and reload might not work for large databases during
automated package upgrades because of the time and disk space
overhead.)
The original poster did a significant distribution upgrade and not just a
package upgrade.
While there might be distributions which have some sort of upgrade magic I
strongly recommend that everybody should follow the standard slapcat/slapadd
procedure when doing significant upgrade. And of course do a backup right
before upgrade after turning down writing to the directory. Everything else I
would not trust enough for a serious deployment.
Ciao, Michael.
10:48 a.m.
Florian Weimer wrote:
* Michael Ströder:
> Florian Weimer wrote:
>> * Onno van der Straaten:
>>
>>> Ubuntu server upgrade from 12.04 to 14.04 LTS will purge the OpenLDAP
>>> directory data.
>>
>> Is there an Ubuntu bug for this behavior? It's a bit odd.
>
> One should generally be careful with system upgrades.
>
> AFAIK on-disk-format might change because of Berkeley-DB version upgrade.
Unless OpenLDAP uses the HASH database type,
OpenLDAP abandoned the HASH format in OpenLDAP 2.2.
it's sufficient to
checkpoint the Berkeley DB environment (and perhaps some other
undocumented magic) *before* updating OpenLDAP. The on-disk format of
B-Tree-type databases is quite stable.
But the environment and logfile formats have changed quite a bit, and
while newer BDB versions will open older B+tree DB files, there's no
telling what sub-optimal effects that has on operation.
A clean shutdown will do a checkpoint. You will still need to cleanup
the environment and logfiles so that the new BDB version doesn't try to
use them. (E.g., using db_recover and db_archive - all covered in the
BDB documentation so I won't provide details here.)
None of this is ever guaranteed to work. The only upgrade procedure that
is documented and will always work is slapcat/slapadd.
(Automated dump and reload might not work for large databases during
automated package upgrades because of the time and disk space
overhead.)
--
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/
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9 comments
7 participants
participants (7)
-
Brendan Kearney -
Florian Weimer -
Howard Chu -
Michael Ströder -
Onno van der Straaten -
Robert Heller -
Ryan Tandy