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RE: a newbie trying to get the basics of syncrepl going




>-----Original Message-----
>From: Jonathan Clarke [mailto:jonathan@phillipoux.net]
>Sent: Thursday, February 25, 2010 6:00 AM
>To: Seger, Mark
>Cc: openldap-technical@openldap.org
>Subject: Re: a newbie trying to get the basics of syncrepl going
>
>On 23/02/2010 22:26, Seger, Mark wrote:
>> I’m an admitted ldap lightweight but have been able to bring up an
>ldap
>> server and populate it with the contents of my /etc/passwd file. Now I
>> want to set up a replica on another machine using sync replication and
>> am having a few issues getting it to work. My most recent success was
>> getting simple authentication working because before it was failing
>and
>> now it’s not so I’ve at least gotten that far. Here’s what my
>> replication section looks like in ldap.conf:
>>
>> syncrepl rid=123
>>
>> provider=ldap://10.99.99.99:389
>>
>> type=refreshOnly
>>
>> interval=01:00:00:00
>>
>> searchbase="dc=myldap,dc=com"
>>
>> filter="(objectClass=account)"
>>
>> scope=sub
>>
>> schemachecking=off
>>
>> updatedn="cn=replica,dc=myldap,dc=com"
>>
>> bindmethod=simple
>>
>> binddn="uid=lsfadmin,ou=People,dc=myldap,dc=com"
>>
>> credentials=Something
>>
>> I’m pretty sure I have the search parameters set correctly because if
>I run:
>>
>> ldapsearch -x -h 10.99.99.99 -b 'dc=myldap,dc=com' -A uid
>>
>> it dumps all my uids.
>>
>> The part I’m on clear on is how to define things on the slave side.
>For
>> example I have the main part of the conf set the same on the master,
>> just to make things easy on me and so I have the following which is
>> exactly how I have the master set up.
>>
>> database bdb
>>
>> suffix "dc=myldap,dc=com"
>>
>> rootdn "cn=Manager,dc=myldap,dc=com"
>>
>> rootpw {SSHA}ZmTfiKLVf8X5GERsT3b3AoB3/hFV3l7R
>>
>> directory /var/lib/ldap
>>
>> I’m guessing my problem may be with
>> updatedn="cn=replica,dc=myldap,dc=com", but I’m not sure what it
>should
>> be and whether or not I have to prime the replica with any special
>> authentication to be able to write to it.
>>
>> If I run “ldapsearch -x -b 'dc=myldap,dc=com'” against the replica it
>> comes up empty so I’m sure nothing is getting replicated. Further if I
>> run the slave slapd with –d128 I get:
>>
>> [root@hpdc3dmgt1 ~]# slapd -d 128
>>
>> @(#) $OpenLDAP: slapd 2.3.43 (Nov 6 2008 02:53:24) $
>>
>> brewbuilder@hs20-bc1-
>5.build.redhat.com:/builddir/build/BUILD/openldap-2.3.43/openldap-
>2.3.43/build-servers/servers/slapd
>>
>> slapd starting
>>
>> request done: ld 0x2ac52b507c70 msgid 1
>>
>> => bdb_entry_get: cannot find entry: "dc=myldap,dc=com"
>>
>> do_syncrep2: rid 123got search entry without control
>>
>> do_syncrepl: rid 123 quitting
>>
>> but I have no idea where it’s looking for the entry, on the master or
>> the slave? But I do have that entry on the master.
>>
>> I’m sure I’m doing something wrong but am also hoping it’s relatively
>minor.
>
>Don't forget that syncrepl is pull-based replication. That is, the slave
>connects to the master and gets data.
>
>In light of this, check your configuration for:
>- the syncrepl statement above in the *slave* slapd.conf
>- a "overlay syncprov" in the *master* slapd.conf (plus any
>configuration you may want)

I've made progress, I finally got my slave authticting with the master, butI'm confused with your statement about modifying something in the master's slapd.conf.  I don't want to, nor do I think I even can, modify anything with the master.  I'm basing my choice for using syncrepl on http://www.openldap.org/doc/admin22/syncrepl.html, which says in the first section:

"With syncrepl, a consumer server can create a replica without changing provider's configurations and without restarting the provider server, if the consumer server has appropriate access privileges for the DIT fragment to be replicated. The consumer server can stop the replication also without the need for provider-side changes and restart."

I'm assuming my replication isn't work, even though I don't see any errors, because when I run slapd on the slave followed by slapcat, all I see is the original entry I populated it with, namely: dn: cn=Manager,dc=myldap,dc=com.

Are there some specific debugging switches I can use when running the slave to get some insight into what's happening?  I did try various combinations of the debugging switch and didn't see anything jump out of the output though I was surprised to see what looked like a lot of SNMP OIDs.

Is there some explicit way to see the slave send a pull request to the master and see what the master returns?

Does this mean anything: do_syncrep2: rid 123got search entry without control

-mark

>- the "updatedn" element in your syncrepl statement should not be
>necessary. As the man page stipulates: "It is only needed in certain
>push-mode replication scenarios."
>
>This should get things going, if not, please post back here with more
>details on any errors you have (log file extracts).
>
>Hope this helps,
>Jonathan
>--
>--------------------------------------------------------------
>Jonathan Clarke - jonathan@phillipoux.net
>--------------------------------------------------------------
>Ldap Synchronization Connector (LSC) - http://lsc-project.org
>--------------------------------------------------------------