CSN too old again.... - openldap-technical

5 Nov 2008


      Dear all,
I have 4 servers with version 2.4.9 configured into 4 way masters, the 
name of the servers are disb01 (SID:001), disb02 (SID:002), pisb01 
(SID:003) and pisb02 (SID:004).  Attached is the config file for the 4 
servers.
All the 4 servers are configured and started on Oct 29 night.  At that 
time, I test the data synchronization, the result is positive.   
However, today, customer reported that data synchronization occurs, 
then, I perform the following simple test and find that data is really 
can't replicated.
- When I added a record (the key is 
20081104105123.573091Z#000000#003#000000) in pisb01, the data can be 
replicated to pisb02, but the other 2 servers disb01 and disb02 cannot 
find this record.  The log in disb01 and disb02 indicates that the CSN 
is too old.
- When I added a record (the key is 
20081104105455.436768Z#000000#001#000000) in disb01, the data can be 
replicated to pisb01, but the other 2 servers disb02 and pisb02 cannot 
find this record.  The log in disb01 and disb02 indicates that the CSN 
is too old.
The log for the 4 servers is attached...
Any possible reasons for this error "CSN too old" ?  I find from the log 
that seems all servers received update at the same time (up to seconds, 
no millisecond is shown in the log)
Thanks
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#
# See slapd.conf(5) for details on configuration options.
# This file should NOT be world readable.
#
include		/usr/local/etc/openldap/schema/core.schema
include		/usr/local/etc/openldap/schema/cosine.schema
include 	/usr/local/etc/openldap/schema/inetorgperson.schema
include 	/usr/local/etc/openldap/schema/pccw.schema
include         /usr/local/etc/openldap/schema/ppolicy.schema
# Define global ACLs to disable default read access.
# Do not enable referrals until AFTER you have a working directory
# service AND an understanding of referrals.
#referral	ldap://root.openldap.org
pidfile		/usr/local/var/run/slapd.pid
argsfile	/usr/local/var/run/slapd.args
# Load dynamic backend modules:
# modulepath	/usr/local/libexec/openldap
# moduleload	back_bdb.la
# moduleload	back_ldap.la
# moduleload	back_ldbm.la
# moduleload	back_passwd.la
# moduleload	back_shell.la
#modulepath /usr/local/libexec/openldap/
#moduleload ppolicy.la
# Password policy
#overlay ppolicy
#ppolicy_default "cn=default,ou=Policies"
#ppolicy_default "cn=default,ou=Policies,o=HKSARG"
# Sample security restrictions
#	Require integrity protection (prevent hijacking)
#	Require 112-bit (3DES or better) encryption for updates
#	Require 63-bit encryption for simple bind
# security ssf=1 update_ssf=112 simple_bind=64
# Sample access control policy:
#	Root DSE: allow anyone to read it
#	Subschema (sub)entry DSE: allow anyone to read it
#	Other DSEs:
#		Allow self write access
#		Allow authenticated users read access
#		Allow anonymous users to authenticate
#	Directives needed to implement policy:
# access to dn.base="" by * read
# access to dn.base="cn=Subschema" by * read
# access to *
#	by self write
#	by users read
#	by anonymous auth
#
# if no access controls are present, the default policy
# allows anyone and everyone to read anything but restricts
# updates to rootdn.  (e.g., "access to * by * read")
#
# rootdn can always read and write EVERYTHING!
#######################################################################
# BDB database definitions
#######################################################################
database	bdb
suffix		""
rootdn		"cn=Manager"
#rootdn		"ou=SCIG,ou=Govt-Dept,o=HKSARG,dc=example,dc=com"
# Cleartext passwords, especially for the rootdn, should
# be avoid.  See slappasswd(8) and slapd.conf(5) for details.
# Use of strong authentication encouraged.
#rootpw		secret
rootpw		{SSHA}hzt3Mw7MTu+PvXuk8p24xMwLyscP2rls
# The database directory MUST exist prior to running slapd AND 
# should only be accessible by the slapd and slap tools.
# Mode 700 recommended.
directory	/usr/local/var/openldap-data
# Indices to maintain
index	objectClass,entryCSN,entryUUID,cn,pwdChangedTime	eq
#replogfile /var/lib/ldap/openldap-master-replog
loglevel 16384
logfile /var/lib/ldap/ldap.log
overlay syncprov
overlay ppolicy
ppolicy_default "cn=default,ou=Policies,o=HKSARG"
ppolicy_hash_cleartext
#access to * by dn="cn=Manager" write by * read
access to * by anonymous auth by * write by dn.base="o=HKSARG" write by * none
access to * by * write
access to * by * read
#database monitor
#syncprov-checkpoint 100 10
syncprov-sessionlog 100
# syncrepl directives
syncrepl      rid=001
              provider=ldap://disb01:389/
              bindmethod=simple
              binddn="cn=Manager"
              credentials=secret
              searchbase="o=HKSARG"
              schemachecking=off
              type=refreshAndPersist
     	      attrs="*,+"
              retry="1 +"
syncrepl      rid=002
              provider=ldap://disb02:389/
              bindmethod=simple
              binddn="cn=Manager"
              credentials=secret
              searchbase="o=HKSARG"
              schemachecking=off
              type=refreshAndPersist
     	      attrs="*,+"
              retry="1 +"
syncrepl      rid=003
              provider=ldap://pisb01:389/
              bindmethod=simple
              binddn="cn=Manager"
              credentials=secret
              searchbase="o=HKSARG"
              schemachecking=off
              type=refreshAndPersist
    	      attrs="*,+"
              retry="1 +"
syncrepl      rid=004
              provider=ldap://pisb02:389/
              bindmethod=simple
              binddn="cn=Manager"
              credentials=secret
              searchbase="o=HKSARG"
              schemachecking=off
              type=refreshAndPersist
    	      attrs="*,+"
              retry="1 +"
mirrormode on
serverID   002
#overlay syncprov
#syncprov-checkpoint 100 10
#syncprov-sessionlog 100
# Performance tuning directives
sizelimit       5000
threads         8
idletimeout     14400
cachesize       10000
checkpoint      256     15
#
# See slapd.conf(5) for details on configuration options.
# This file should NOT be world readable.
#
include		/usr/local/etc/openldap/schema/core.schema
include		/usr/local/etc/openldap/schema/cosine.schema
include 	/usr/local/etc/openldap/schema/inetorgperson.schema
include 	/usr/local/etc/openldap/schema/pccw.schema
include         /usr/local/etc/openldap/schema/ppolicy.schema
# Define global ACLs to disable default read access.
# Do not enable referrals until AFTER you have a working directory
# service AND an understanding of referrals.
#referral	ldap://root.openldap.org
pidfile		/usr/local/var/run/slapd.pid
argsfile	/usr/local/var/run/slapd.args
# Load dynamic backend modules:
# modulepath	/usr/local/libexec/openldap
# moduleload	back_bdb.la
# moduleload	back_ldap.la
# moduleload	back_ldbm.la
# moduleload	back_passwd.la
# moduleload	back_shell.la
#modulepath /usr/local/libexec/openldap/
#moduleload ppolicy.la
# Password policy
#overlay ppolicy
#ppolicy_default "cn=default,ou=Policies"
#ppolicy_default "cn=default,ou=Policies,o=HKSARG"
# Sample security restrictions
#	Require integrity protection (prevent hijacking)
#	Require 112-bit (3DES or better) encryption for updates
#	Require 63-bit encryption for simple bind
# security ssf=1 update_ssf=112 simple_bind=64
# Sample access control policy:
#	Root DSE: allow anyone to read it
#	Subschema (sub)entry DSE: allow anyone to read it
#	Other DSEs:
#		Allow self write access
#		Allow authenticated users read access
#		Allow anonymous users to authenticate
#	Directives needed to implement policy:
# access to dn.base="" by * read
# access to dn.base="cn=Subschema" by * read
# access to *
#	by self write
#	by users read
#	by anonymous auth
#
# if no access controls are present, the default policy
# allows anyone and everyone to read anything but restricts
# updates to rootdn.  (e.g., "access to * by * read")
#
# rootdn can always read and write EVERYTHING!
#######################################################################
# BDB database definitions
#######################################################################
database	bdb
suffix		""
rootdn		"cn=Manager"
#rootdn		"ou=SCIG,ou=Govt-Dept,o=HKSARG,dc=example,dc=com"
# Cleartext passwords, especially for the rootdn, should
# be avoid.  See slappasswd(8) and slapd.conf(5) for details.
# Use of strong authentication encouraged.
#rootpw		secret
rootpw		{SSHA}hzt3Mw7MTu+PvXuk8p24xMwLyscP2rls
# The database directory MUST exist prior to running slapd AND 
# should only be accessible by the slapd and slap tools.
# Mode 700 recommended.
directory	/usr/local/var/openldap-data
# Indices to maintain
index	objectClass,entryCSN,entryUUID,cn,pwdChangedTime	eq
#replogfile /var/lib/ldap/openldap-master-replog
loglevel 16384
logfile /var/lib/ldap/ldap.log
overlay syncprov
overlay ppolicy
ppolicy_default "cn=default,ou=Policies,o=HKSARG"
ppolicy_hash_cleartext
#access to * by dn="cn=Manager" write by * read
access to * by anonymous auth by * write by dn.base="o=HKSARG" write by * none
access to * by * write
access to * by * read
#database monitor
#syncprov-checkpoint 100 10
syncprov-sessionlog 100
# syncrepl directives
syncrepl      rid=001
              provider=ldap://disb01:389/
              bindmethod=simple
              binddn="cn=Manager"
              credentials=secret
              searchbase="o=HKSARG"
              schemachecking=off
              type=refreshAndPersist
     	      attrs="*,+"
              retry="1 +"
syncrepl      rid=002
              provider=ldap://disb02:389/
              bindmethod=simple
              binddn="cn=Manager"
              credentials=secret
              searchbase="o=HKSARG"
              schemachecking=off
              type=refreshAndPersist
     	      attrs="*,+"
              retry="1 +"
syncrepl      rid=003
              provider=ldap://pisb01:389/
              bindmethod=simple
              binddn="cn=Manager"
              credentials=secret
              searchbase="o=HKSARG"
              schemachecking=off
              type=refreshAndPersist
    	      attrs="*,+"
              retry="1 +"
syncrepl      rid=004
              provider=ldap://pisb02:389/
              bindmethod=simple
              binddn="cn=Manager"
              credentials=secret
              searchbase="o=HKSARG"
              schemachecking=off
              type=refreshAndPersist
    	      attrs="*,+"
              retry="1 +"
mirrormode on
serverID   001
#overlay syncprov
#syncprov-checkpoint 100 10
#syncprov-sessionlog 100
# Performance tuning directives
sizelimit       5000
threads         8
idletimeout     14400
cachesize       10000
checkpoint      256     15
#
# See slapd.conf(5) for details on configuration options.
# This file should NOT be world readable.
#
include		/usr/local/etc/openldap/schema/core.schema
include		/usr/local/etc/openldap/schema/cosine.schema
include 	/usr/local/etc/openldap/schema/inetorgperson.schema
include 	/usr/local/etc/openldap/schema/pccw.schema
include         /usr/local/etc/openldap/schema/ppolicy.schema
# Define global ACLs to disable default read access.
# Do not enable referrals until AFTER you have a working directory
# service AND an understanding of referrals.
#referral	ldap://root.openldap.org
pidfile		/usr/local/var/run/slapd.pid
argsfile	/usr/local/var/run/slapd.args
# Load dynamic backend modules:
# modulepath	/usr/local/libexec/openldap
# moduleload	back_bdb.la
# moduleload	back_ldap.la
# moduleload	back_ldbm.la
# moduleload	back_passwd.la
# moduleload	back_shell.la
#modulepath /usr/local/libexec/openldap/
#moduleload ppolicy.la
# Password policy
#overlay ppolicy
#ppolicy_default "cn=default,ou=Policies"
#ppolicy_default "cn=default,ou=Policies,o=HKSARG"
# Sample security restrictions
#	Require integrity protection (prevent hijacking)
#	Require 112-bit (3DES or better) encryption for updates
#	Require 63-bit encryption for simple bind
# security ssf=1 update_ssf=112 simple_bind=64
# Sample access control policy:
#	Root DSE: allow anyone to read it
#	Subschema (sub)entry DSE: allow anyone to read it
#	Other DSEs:
#		Allow self write access
#		Allow authenticated users read access
#		Allow anonymous users to authenticate
#	Directives needed to implement policy:
# access to dn.base="" by * read
# access to dn.base="cn=Subschema" by * read
# access to *
#	by self write
#	by users read
#	by anonymous auth
#
# if no access controls are present, the default policy
# allows anyone and everyone to read anything but restricts
# updates to rootdn.  (e.g., "access to * by * read")
#
# rootdn can always read and write EVERYTHING!
#######################################################################
# BDB database definitions
#######################################################################
database	bdb
suffix		""
rootdn		"cn=Manager"
#rootdn		"ou=SCIG,ou=Govt-Dept,o=HKSARG,dc=example,dc=com"
# Cleartext passwords, especially for the rootdn, should
# be avoid.  See slappasswd(8) and slapd.conf(5) for details.
# Use of strong authentication encouraged.
#rootpw		secret
rootpw		{SSHA}hzt3Mw7MTu+PvXuk8p24xMwLyscP2rls
# The database directory MUST exist prior to running slapd AND 
# should only be accessible by the slapd and slap tools.
# Mode 700 recommended.
directory	/usr/local/var/openldap-data
# Indices to maintain
index	objectClass,entryCSN,entryUUID,cn,pwdChangedTime	eq
#replogfile /var/lib/ldap/openldap-master-replog
loglevel 16384
logfile /var/lib/ldap/ldap.log
overlay syncprov
overlay ppolicy
ppolicy_default "cn=default,ou=Policies,o=HKSARG"
ppolicy_hash_cleartext
#access to * by dn="cn=Manager" write by * read
access to * by anonymous auth by * write by dn.base="o=HKSARG" write by * none
access to * by * write
access to * by * read
#database monitor
#syncprov-checkpoint 100 10
syncprov-sessionlog 100
# syncrepl directives
syncrepl      rid=001
              provider=ldap://disb01:389/
              bindmethod=simple
              binddn="cn=Manager"
              credentials=secret
              searchbase="o=HKSARG"
              schemachecking=off
              type=refreshAndPersist
     	      attrs="*,+"
              retry="1 +"
syncrepl      rid=002
              provider=ldap://disb02:389/
              bindmethod=simple
              binddn="cn=Manager"
              credentials=secret
              searchbase="o=HKSARG"
              schemachecking=off
              type=refreshAndPersist
     	      attrs="*,+"
              retry="1 +"
syncrepl      rid=003
              provider=ldap://pisb01:389/
              bindmethod=simple
              binddn="cn=Manager"
              credentials=secret
              searchbase="o=HKSARG"
              schemachecking=off
              type=refreshAndPersist
     	      attrs="*,+"
              retry="1 +"
syncrepl      rid=004
              provider=ldap://pisb02:389/
              bindmethod=simple
              binddn="cn=Manager"
              credentials=secret
              searchbase="o=HKSARG"
              schemachecking=off
              type=refreshAndPersist
              attrs="*,+"
              retry="1 +"
mirrormode on
serverID   003
#overlay syncprov
#syncprov-checkpoint 100 10
#syncprov-sessionlog 100
# Performance tuning directives
sizelimit       5000
threads         8
idletimeout     14400
cachesize       10000
checkpoint      256     15
#
# See slapd.conf(5) for details on configuration options.
# This file should NOT be world readable.
#
include		/usr/local/etc/openldap/schema/core.schema
include		/usr/local/etc/openldap/schema/cosine.schema
include 	/usr/local/etc/openldap/schema/inetorgperson.schema
include 	/usr/local/etc/openldap/schema/pccw.schema
include         /usr/local/etc/openldap/schema/ppolicy.schema
# Define global ACLs to disable default read access.
# Do not enable referrals until AFTER you have a working directory
# service AND an understanding of referrals.
#referral	ldap://root.openldap.org
pidfile		/usr/local/var/run/slapd.pid
argsfile	/usr/local/var/run/slapd.args
# Load dynamic backend modules:
# modulepath	/usr/local/libexec/openldap
# moduleload	back_bdb.la
# moduleload	back_ldap.la
# moduleload	back_ldbm.la
# moduleload	back_passwd.la
# moduleload	back_shell.la
#modulepath /usr/local/libexec/openldap/
#moduleload ppolicy.la
# Password policy
#overlay ppolicy
#ppolicy_default "cn=default,ou=Policies"
#ppolicy_default "cn=default,ou=Policies,o=HKSARG"
# Sample security restrictions
#	Require integrity protection (prevent hijacking)
#	Require 112-bit (3DES or better) encryption for updates
#	Require 63-bit encryption for simple bind
# security ssf=1 update_ssf=112 simple_bind=64
# Sample access control policy:
#	Root DSE: allow anyone to read it
#	Subschema (sub)entry DSE: allow anyone to read it
#	Other DSEs:
#		Allow self write access
#		Allow authenticated users read access
#		Allow anonymous users to authenticate
#	Directives needed to implement policy:
# access to dn.base="" by * read
# access to dn.base="cn=Subschema" by * read
# access to *
#	by self write
#	by users read
#	by anonymous auth
#
# if no access controls are present, the default policy
# allows anyone and everyone to read anything but restricts
# updates to rootdn.  (e.g., "access to * by * read")
#
# rootdn can always read and write EVERYTHING!
#######################################################################
# BDB database definitions
#######################################################################
database	bdb
suffix		""
rootdn		"cn=Manager"
#rootdn		"ou=SCIG,ou=Govt-Dept,o=HKSARG,dc=example,dc=com"
# Cleartext passwords, especially for the rootdn, should
# be avoid.  See slappasswd(8) and slapd.conf(5) for details.
# Use of strong authentication encouraged.
#rootpw		secret
rootpw		{SSHA}hzt3Mw7MTu+PvXuk8p24xMwLyscP2rls
# The database directory MUST exist prior to running slapd AND 
# should only be accessible by the slapd and slap tools.
# Mode 700 recommended.
directory	/usr/local/var/openldap-data
# Indices to maintain
index	objectClass,entryCSN,entryUUID,cn,pwdChangedTime	eq
#replogfile /var/lib/ldap/openldap-master-replog
loglevel 16384
logfile /var/lib/ldap/ldap.log
overlay syncprov
overlay ppolicy
ppolicy_default "cn=default,ou=Policies,o=HKSARG"
ppolicy_hash_cleartext
#access to * by dn="cn=Manager" write by * read
access to * by anonymous auth by * write by dn.base="o=HKSARG" write by * none
access to * by * write
access to * by * read
#database monitor
#syncprov-checkpoint 100 10
syncprov-sessionlog 100
# syncrepl directives
syncrepl      rid=001
              provider=ldap://disb01:389/
              bindmethod=simple
              binddn="cn=Manager"
              credentials=secret
              searchbase="o=HKSARG"
              schemachecking=off
              type=refreshAndPersist
     	      attrs="*,+"
              retry="1 +"
syncrepl      rid=002
              provider=ldap://disb02:389/
              bindmethod=simple
              binddn="cn=Manager"
              credentials=secret
              searchbase="o=HKSARG"
              schemachecking=off
              type=refreshAndPersist
     	      attrs="*,+"
              retry="1 +"
syncrepl      rid=003
              provider=ldap://pisb01:389/
              bindmethod=simple
              binddn="cn=Manager"
              credentials=secret
              searchbase="o=HKSARG"
              schemachecking=off
              type=refreshAndPersist
     	      attrs="*,+"
              retry="1 +"
syncrepl      rid=004
              provider=ldap://pisb02:389/
              bindmethod=simple
              binddn="cn=Manager"
              credentials=secret
              searchbase="o=HKSARG"
              schemachecking=off
              type=refreshAndPersist
     	      attrs="*,+"
              retry="1 +"
mirrormode on
serverID   004
#overlay syncprov
#syncprov-checkpoint 100 10
#syncprov-sessionlog 100
# Performance tuning directives
sizelimit       5000
threads         8
idletimeout     14400
cachesize       10000
checkpoint      256     15