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Re: multi master no syncing.

Sébastien Bernard wrote:

Hi,

I've setup a multimaster cluster composed of two machine (in my example
192.168.0.204 and 192.168.0.197).
Everything is working ok and both side are replicating ok.

However, I've a problem I'd like to submit to your sagacity.

When I put down a server, and modify the other server (delete or add),
when the first server comes back, the modifications are not pushed in
the old server.
Server 1 says Entry cn=seb,ou=orgunit,o=org,dc=example,dc=com changed by
peer, ignored
You have not provided enough useful information (OpenLDAP version, exact server configurations, which one is "server 1" in your description) to be certain. But most likely you have not configured their ServerIDs correctly. 


Adding new entries works ok and synchronisation happens but for the
nodes altered while one of the servers was down, the modifications are
lost (or more precisely ignored by the other).

My questions:
      Is this normal behaviour (Maybe I got the configuration wrong) ?
      How may I force the missing entries to be replicated to the other ?
(Only solution I found is to wipe the entire database on the down server
that force a replication from its peer).

sincerely,
Seb

Here an extract of the slapd.log from server 1:
Sep 22 10:12:32 dhcp204 slapd[2689]: do_syncrep2: rid=002 (-1) Can't
contact LDAP server
Sep 22 10:12:32 dhcp204 slapd[2689]: do_syncrepl: rid=002 rc -1 retrying
(4 retries left)
Sep 22 10:12:32 dhcp204 slapd[2689]: do_syncrep2: rid=004 (-1) Can't
contact LDAP server
Sep 22 10:12:32 dhcp204 slapd[2689]: do_syncrepl: rid=004 rc -1 retrying
(4 retries left)
Sep 22 10:12:32 dhcp204 slapd[2689]: conn=1002 op=2 UNBIND
Sep 22 10:12:32 dhcp204 slapd[2689]: conn=1002 fd=19 closed
Sep 22 10:12:32 dhcp204 slapd[2689]: conn=1003 op=2 UNBIND
Sep 22 10:12:32 dhcp204 slapd[2689]: conn=1003 fd=20 closed
Sep 22 10:12:37 dhcp204 slapd[2689]: slap_client_connect:
URI=ldap://192.168.0.197 DN="cn=config" ldap_sasl_bind_s failed (-1)
Sep 22 10:12:37 dhcp204 slapd[2689]: do_syncrepl: rid=002 rc -1 retrying
(3 retries left)
Sep 22 10:12:37 dhcp204 slapd[2689]: slap_client_connect:
URI=ldap://192.168.0.197 DN="cn=manager,dc=example,dc=com"
ldap_sasl_bind_s failed (-1)
Sep 22 10:12:37 dhcp204 slapd[2689]: do_syncrepl: rid=004 rc -1 retrying
(3 retries left)

Sep 22 10:12:42 dhcp204 slapd[2689]: slap_client_connect:
URI=ldap://192.168.0.197 DN="cn=manager,dc=example,dc=com"
ldap_sasl_bind_s failed (-1)
Sep 22 10:12:42 dhcp204 slapd[2689]: do_syncrepl: rid=004 rc -1 retrying
(2 retries left)
Sep 22 10:12:42 dhcp204 slapd[2689]: slap_client_connect:
URI=ldap://192.168.0.197 DN="cn=config" ldap_sasl_bind_s failed (-1)
Sep 22 10:12:42 dhcp204 slapd[2689]: do_syncrepl: rid=002 rc -1 retrying
(2 retries left)
Sep 22 10:12:47 dhcp204 slapd[2689]: slap_client_connect:
URI=ldap://192.168.0.197 DN="cn=manager,dc=example,dc=com"
ldap_sasl_bind_s failed (-1)
Sep 22 10:12:47 dhcp204 slapd[2689]: do_syncrepl: rid=004 rc -1 retrying
(1 retries left)
Sep 22 10:12:47 dhcp204 slapd[2689]: slap_client_connect:
URI=ldap://192.168.0.197 DN="cn=config" ldap_sasl_bind_s failed (-1)
Sep 22 10:12:47 dhcp204 slapd[2689]: do_syncrepl: rid=002 rc -1 retrying
(1 retries left)
Sep 22 10:12:52 dhcp204 slapd[2689]: slap_client_connect:
URI=ldap://192.168.0.197 DN="cn=config" ldap_sasl_bind_s failed (-1)
Sep 22 10:12:52 dhcp204 slapd[2689]: do_syncrepl: rid=002 rc -1 retrying
Sep 22 10:12:52 dhcp204 slapd[2689]: slap_client_connect:
URI=ldap://192.168.0.197 DN="cn=manager,dc=example,dc=com"
ldap_sasl_bind_s failed (-1)
Sep 22 10:12:52 dhcp204 slapd[2689]: do_syncrepl: rid=004 rc -1 retrying
Sep 22 10:12:57 dhcp204 slapd[2689]: slap_client_connect:
URI=ldap://192.168.0.197 DN="cn=config" ldap_sasl_bind_s failed (-1)
Sep 22 10:12:57 dhcp204 slapd[2689]: do_syncrepl: rid=002 rc -1 retrying
(4 retries left)
Sep 22 10:12:57 dhcp204 slapd[2689]: slap_client_connect:
URI=ldap://192.168.0.197 DN="cn=manager,dc=example,dc=com"
ldap_sasl_bind_s failed (-1)
Sep 22 10:12:57 dhcp204 slapd[2689]: do_syncrepl: rid=004 rc -1 retrying
(4 retries left)
Sep 22 10:13:02 dhcp204 slapd[2689]: conn=1007 fd=13 ACCEPT from
IP=192.168.0.197:55471 (IP=0.0.0.0:389)
Sep 22 10:13:02 dhcp204 slapd[2689]: conn=1007 op=0 BIND
dn="cn=manager,dc=example,dc=com" method=128
Sep 22 10:13:02 dhcp204 slapd[2689]: conn=1007 op=0 BIND
dn="cn=manager,dc=example,dc=com" mech=SIMPLE ssf=0
Sep 22 10:13:02 dhcp204 slapd[2689]: conn=1007 op=0 RESULT tag=97 err=0
text=
Sep 22 10:13:02 dhcp204 slapd[2689]: conn=1008 fd=15 ACCEPT from
IP=192.168.0.197:55473 (IP=0.0.0.0:389)
Sep 22 10:13:02 dhcp204 slapd[2689]: conn=1008 op=0 BIND dn="cn=config"
method=128
Sep 22 10:13:02 dhcp204 slapd[2689]: conn=1008 op=0 BIND dn="cn=config"
mech=SIMPLE ssf=0
Sep 22 10:13:02 dhcp204 slapd[2689]: conn=1008 op=0 RESULT tag=97 err=0
text=
Sep 22 10:13:02 dhcp204 slapd[2689]: conn=1008 op=1 SRCH
base="cn=config" scope=2 deref=0 filter="(objectClass=*)"
Sep 22 10:13:02 dhcp204 slapd[2689]: conn=1008 op=1 SRCH attr=* +
Sep 22 10:13:02 dhcp204 slapd[2689]: conn=1008 op=1 INTERM
oid=1.3.6.1.4.1.4203.1.9.1.4
Sep 22 10:13:02 dhcp204 slapd[2689]: conn=1007 op=1 SRCH
base="dc=example,dc=com" scope=2 deref=0 filter="(objectClass=*)"
Sep 22 10:13:02 dhcp204 slapd[2689]: conn=1007 op=1 SRCH attr=* +
Sep 22 10:13:02 dhcp204 slapd[2689]: srs csn
20110922081225.199039Z#000000#000#000000
Sep 22 10:13:02 dhcp204 slapd[2689]: log csn
20110922081225.199039Z#000000#000#000000
Sep 22 10:13:02 dhcp204 slapd[2689]: cmp 0, too old
Sep 22 10:13:02 dhcp204 slapd[2689]: Entry
cn=seb,ou=orgunit,o=org,dc=example,dc=com changed by peer, ignored
Sep 22 10:13:02 dhcp204 slapd[2689]: syncprov_search_response:
cookie=rid=003,csn=20110922081235.611410Z#000000#000#000000
Sep 22 10:13:02 dhcp204 slapd[2689]: conn=1007 op=1 INTERM
oid=1.3.6.1.4.1.4203.1.9.1.4
Sep 22 10:17:57 dhcp204 slapd[2689]: do_syncrep2: rid=002
LDAP_RES_INTERMEDIATE - REFRESH_DELETE
Sep 22 10:17:57 dhcp204 slapd[2689]: do_syncrep2: rid=004
LDAP_RES_INTERMEDIATE - REFRESH_DELET





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  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP  http://www.openldap.org/project/