Re: WARNING: No dynamic config support for database ldbm

[Tomasz Chmielewski <mangoo@wpkg.org>]

Pierangelo Masarati schrieb:
> > I'm trying to build an OpenLDAP (2.3.18) server and to make it run on an
> > "embedded" mipsel/uclibc device running Linux.
> >
> >
> > After some initial hardships, I was able to build slapd + libs + utils
> > etc. successfully.
> >
> > However, when I run it (slapd -d 5), I can see a warning:
> >
> > WARNING: No dynamic config support for database ldbm
>
>
> It's warning you that back-ldap does not support dynamic configuration
> using back-config

Well, that's exactly what the warning says.
But I don't understand why (I think I used the correct flags to build it 
with ldbm support).


> > I was going to use ldbm, and to make the binaries as small as possible.
>
>
> Poor choice, if you start from scratch (poor choice in any case).

Anyway, I built it once again, and now use "ldif" database.
At least it works (and the binary is smaller, too).


> > In slapd.conf I have the ldbm module listed (and the files exists there
> > of course):
> >
> > modulepath      /usr/sbin/openldap/
> > moduleload      back_ldbm.la
> >
> >
> > Why does slapd say this "No dynamic config support for database ldbm"
> > warning?
>
>
> see above.  It's harmless, as soon as you do not intend to run-time modify
> the configuration of slapd.

How can it be "not harmless", as I'm not able to add any data to the db 
(or fetch any existing data)?


> > When I try to search anything using ldapsearch, it doesn't produce any
> > results, and moreover slapd says:
> >
> > => ldbm_cache_open( "/etc/openldap/db/dn2id.dbb", 73, 600 )
> > <= ldbm_cache_open NULL "/etc/openldap/db/dn2id.dbb" errno=2
> > reason="unknown")
> > <= dn2id could not open dn2id.dbb
> >
> >
> > Has anyone get an explanation for that?
>
>
> As I'm not psychic I can only guess.  Sorry for asking silly questions;
> did you load any data into slapd? 

First, I copied data from the other server (as I always do with new 
servers) - it didn't work.
Then, I tried adding data with slapadd - still without success.

> Did you load it as root and then ran
> slapd as another user? 

So far, I've been running everything as root.

> does "/etc/openldap/db/dn2id.dbb" exist?  does any
> of the portions of that path exist?

Yes, it exists, but for some reason it couldn't be opened - I guess 
because slapd can see the file(s), but can't read the data in it - as in 
this warning "no config support for ldbm".

Anyway, rebuilt OpenLDAP with really minimal options (I hope):

./configure --target=mipsel-linux --host=mipsel-linux 
--build=i386-pc-linux-gnu     --with-yielding_select=no --with-tls=no 
--with-cyrus-sasl=no --prefix=/usr --enable-slurpd=no --enable-ipv6=no 
   --sysconfdir=/etc --localstatedir=/var/run/ldap --enable-overlays=no 
--libexecdir=/usr/sbin --enable-bdb=no --enable-ldbm=no --enable-hdb=no 
--enable-monitor=no --enable-relay=no --enable-ldap=yes

Now I use "ldif" database, I added data with slapadd and the server is 
running fine (and uses only about 2 MB of RAM), so I think I will not 
try ldbm again.

Anything special I should know about the "ldif" database?


--
Tomasz Chmielewski
http://wpkg.org