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OpenLDAP : Multi-Master Replication2024/04/18
 
Configure OpenLDAP Multi-Master Replication.
For the Settings of Provider/Consumer, it's impossible to add data on Consumer server,
however, on 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.
For only the parameters [olcServerID] and [provider=***], set different value on each server.
root@dlp:~ #
vi syncprov.ldif
# create new

dn: olcOverlay=syncprov,olcDatabase={2}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={2}mdb,cn=config"
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={2}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 name
  binddn="cn=Manager,dc=srv,dc=world"
  # directory manager 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={2}mdb,cn=config"
[3] Configure LDAP Client to bind all LDAP server.
# for the case of nslcd

root@client:~ #
vi /usr/local/etc/nslcd.conf
# line 19 : add new consumer server URI

uri ldap://dlp.srv.world/
uri ldap://node02.srv.world/
root@client:~ #
service nslcd restart

# for the case of sssd

root@client:~ #
vi /usr/local/etc/sssd/sssd.conf
# add consumer

ldap_uri = ldap://dlp.srv.world/
,ldap://node02.srv.world/
root@client:~ #
service sssd restart

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