Thursday, April 30, 2020

[389-users] Re: DNA plugin not working

Is it possible to create multiple instances of the DNA plugin on CentOS 7 / RHDS 10 / 389-ds-base-1.3.7.5-28.el7_5.x86_64?  The section on how to do this was added to the RHDS 11 documentation, and uses dsconf to do it.  If it is possible, could anyone comment on what dsconf is doing behind the scenes so I can replicate that?

Thanks,

James

On Apr 17, 2020, at 6:17 PM, Mark Reynolds <mreynolds@redhat.com> wrote:


On 4/17/20 5:19 PM, CHAMBERLAIN James wrote:
Hi all,

Thank you all for your help.  I've gotten DNA working.  I'll be doing some further work to convince myself that I understand exactly what I did that got it working and can replicate it; but in the meantime, I had a question or two.

Do I correctly understand RHDS 11 Administration Guide, section 7.4.3.1, to mean that if I want to have DNA manage uidNumber and gidNumber separately using different ranges, I'll need to create two instances of the plugin?

I'm not finding dsconf on CentOS 7, including under "yum whatprovides '*/dsconf'".  Am I missing something?  Was this tool released in something more recent than 1.3.7.5-28?

You need the RHDS 10 docs, only CentOS 8 has the new CLI tools (389-ds-base-1.4.x)

https://access.redhat.com/documentation/en-us/red_hat_directory_server/10/

Sorry have to run, but I'll try and respond to your questions next week...


I suspect that the key differences between my original setup and what's working now are the establishment of a dnaSharedCfgDN and non-overlapping initial ranges.  My original test setup was a single master server, which didn't need these things.  It was suggested that I may need to include the attribute I wanted DNA to manage as part of creating an entry, and that I should give it dnaMagicRegen's value. However, this does not appear that it's necessary - I was able to add a test user without specifying a uidNumber and DNA generated it for me.

Thanks,

James


On Apr 16, 2020, at 1:38 PM, CHAMBERLAIN James <James.CHAMBERLAIN@3ds.com> wrote:

Hi Thierry,

The thing is, while this is on the production multi-master cluster, it's not being used yet.  Any new entries being added have uidNumber set explicitly, except for my test entry.  I've been trying a few things and have a different error message now but the same result.  I'll update the thread shortly with further details.

Best regards,

James


On Apr 16, 2020, at 1:23 PM, thierry bordaz <tbordaz@redhat.com> wrote:

Hi James,

I would guess that the allocated range is exhausted, means next value reached maxValue.
Possibly part of the range was taken by an other replica.

You can try to get more details with

ldapmodify -D "cn=directory manager" -W
dn: cn=config
changetype: modify
replace: nsslapd-accesslog-level
nsslapd-acceslog-level: 260       (default level 256 plus 4 for internal operations)
-
replace: nsslapd-plugin-logging
nsslapd-plugin-logging: on

and lookup at the entry ldapsearch -D DM... -b "cn=UID numbers,cn=Distributed Numeric Assignment Plugin,cn=plugins,cn=config" -s base nscpentrywsi


best regards
thierry
On 4/13/20 8:41 PM, CHAMBERLAIN James wrote:
Hi Mark,

Thanks for getting back to me.  After adjusting nsslapd-errorlog-level, here's what I've got.

# grep dna-plugin /var/log/dirsrv/slapd-example/errors
[13/Apr/2020:14:30:00.480608036 -0400] - DEBUG - dna-plugin - _dna_pre_op_add - dn does not match filter
[13/Apr/2020:14:30:00.486700059 -0400] - DEBUG - dna-plugin - _dna_pre_op_add - adding uidNumber to uid=testuser1,ou=People,dc=example,dc=com as -2
[13/Apr/2020:14:30:00.559245389 -0400] - DEBUG - dna-plugin - _dna_pre_op_add - retrieved value 0 ret 1
[13/Apr/2020:14:30:00.561303217 -0400] - ERR - dna-plugin - _dna_pre_op_add - Failed to allocate a new ID!! 2
[13/Apr/2020:14:30:00.571360868 -0400] - DEBUG - dna-plugin - dna_pre_op - Operation failure [1]

And here's the DNA config:

dn: cn=UID numbers,cn=Distributed Numeric Assignment Plugin,cn=plugins,cn=config
objectClass: top
objectClass: extensibleObject
cn: UID numbers
dnaType: uidNumber
dnamaxvalue: 100000
dnamagicregen: 0
dnafilter: (objectclass=posixAccount)
dnascope: dc=example,dc=com
dnanextvalue: 25000

dn: cn=GID numbers,cn=Distributed Numeric Assignment Plugin,cn=plugins,cn=config
objectClass: top
objectClass: extensibleObject
cn: GID numbers
dnaType: gidNumber
dnamaxvalue: 100000
dnamagicregen: 0
dnafilter: (objectclass=posixGroup)
dnascope: dc=example,dc=com
dnanextvalue: 25000

Best regards,

James


On Apr 13, 2020, at 2:25 PM, Mark Reynolds <mreynolds@redhat.com> wrote:

Enabling plugin logging will provide a little more detail about what is going wrong:

ldapmodify -D "cn=directory manager" -W
dn: cn=config
changetype: modify
replace: nsslapd-errorlog-level
nsslapd-errorlog-level: 65536


After running the test you can disable the debug plugin logging by setting the log level to zero.

Then share what information is logging when you add a new user.   This is most likely a configuration error so hopefully we can find out what went wrong in your set up.  Can you also provide the DNA config entries?

Thanks,

Mark

On 4/13/20 1:50 PM, CHAMBERLAIN James wrote:
Hi all,

I'm trying to use the DNA plugin to add uidNumbers on posixAccounts.  Everything worked fine in testing, but now that it's in production I'm seeing the following error:

ERR - dna-plugin -_dna_pre_op_add - Failed to allocate a new ID!! 2

I've followed the advice in the knowledge base (https://access.redhat.com/solutions/875133), about adding an equality index with an nsMatchingRule of integerOrderingMatch, but have not seen any difference in the server's behavior.  Any ideas what I should try next?

Thanks,

James
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