Ubuntu 18.04
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OpenLDAP : Multi-Master Replication
2018/06/05
 
Configure OpenLDAP Multi-Master Replication.
For the Settings of Provider/Consumer, it's impossible to add datas on Consumer server, but if configure this Multi-Master Settings, it's possbile to add on any Master server.
[1]
[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

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"

root@dlp:~#
vi syncprov.ldif
# create new

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

root@dlp:~#
ldapadd -Y EXTERNAL -H ldapi:/// -f syncprov.ldif

SASL/EXTERNAL authentication started
SASL username: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth
SASL SSF: 0
adding new entry "olcOverlay=syncprov,olcDatabase={1}mdb,cn=config"
[3] Configure like follows on all servers. But 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 uniq 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://10.0.0.51:389/
  bindmethod=simple
  # own domain name
  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

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

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"

adding new entry "olcOverlay=syncprov,olcDatabase={1}mdb,cn=config"
[4] Configure LDAP Client to bind all LDAP server.
root@www:~#
vi /etc/ldap.conf
# line 30: add LDAP Consumer

uri
ldap://dlp.srv.world ldap://node01.srv.world
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