OpenLDAP : Multi-Master Replication2025/09/05

	Configure OpenLDAP Multi-Master Replication. For the Settings of Provider/Consumer, it's impossible to add data on Consumer server, however, if configure this Multi-Master Settings, it's possible to add on any Master server.
[1]	Configure Basic LDAP Server settings on all server, refer to here.
[2]	Configure like follows on all servers. Add syncprov module.

root@dlp:~#

vi mod_syncprov.ldif

# create new

dn: cn=module,cn=config
objectClass: olcModuleList
cn: module
olcModulePath: /usr/lib/ldap
olcModuleLoad: syncprov.la

dn: olcOverlay=syncprov,olcDatabase={1}mdb,cn=config
objectClass: olcOverlayConfig
objectClass: olcSyncProvConfig
olcOverlay: syncprov
olcSpSessionLog: 100

root@dlp:~#

ldapadd -Y EXTERNAL -H ldapi:/// -f mod_syncprov.ldif

SASL/EXTERNAL authentication started
SASL username: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth
SASL SSF: 0
adding new entry "cn=module,cn=config"

adding new entry "olcOverlay=syncprov,olcDatabase={1}mdb,cn=config"

[3]	Configure like follows on all servers. However, only the parameters [olcServerID] and [provider=***], set different value on each server.

root@dlp:~#

vi master01.ldif

# create new

dn: cn=config
changetype: modify
replace: olcServerID
# specify unique ID number on each server
olcServerID: 101

dn: olcDatabase={1}mdb,cn=config
changetype: modify
add: olcSyncRepl
olcSyncRepl: rid=001
  # specify another LDAP server's URI
  provider=ldap://node02.srv.world:389/
  bindmethod=simple
  # your domain suffix
  binddn="cn=admin,dc=srv,dc=world"
  # directory manager's password
  credentials=password
  searchbase="dc=srv,dc=world"
  # includes subtree
  scope=sub
  schemachecking=on
  type=refreshAndPersist
  # [retry interval] [retry times] [interval of re-retry] [re-retry times]
  retry="30 5 300 3"
  # replication interval
  interval=00:00:05:00
-
add: olcMirrorMode
olcMirrorMode: TRUE

root@dlp:~#

ldapmodify -Y EXTERNAL -H ldapi:/// -f master01.ldif

SASL/EXTERNAL authentication started
SASL username: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth
SASL SSF: 0
modifying entry "cn=config"

modifying entry "olcDatabase={1}mdb,cn=config"

[4]	Configure LDAP Client to bind all LDAP server.

root@client:~#

vi /etc/nslcd.conf

# line 10 : add LDAP Consumer

uri ldap://dlp.srv.world/

ldap://node02.srv.world/

root@client:~#

systemctl restart nslcd

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