mmr of cn=config with OpenLDAP 2.6

Hi to all,

is it now save to use mmr of cn=config with OpenLDAP 2.6? I got it running with 4 server. I'm installing all 4 server with Ansible so I created a basic configuration: ------------------ dn: cn=config objectClass: olcGlobal cn: config olcLogLevel: sync olcLogLevel: stats olcPidFile: /var/symas/run/slapd.pid olcArgsFile: /var/symas/run/slapd.args olcToolThreads: 1 olcServerID: 4

dn: cn=schema,cn=config objectClass: olcSchemaConfig cn: schema

# Read all needed schema from variable in default/main.yml include: file:///opt/symas/etc/openldap/schema/core.ldif include: file:///opt/symas/etc/openldap/schema/cosine.ldif include: file:///opt/symas/etc/openldap/schema/nis.ldif include: file:///opt/symas/etc/openldap/schema/inetorgperson.ldif include: file:///opt/symas/etc/openldap/schema/dyngroup.ldif include: file:///opt/symas/etc/openldap/schema/kerberos.openldap.ldif

# Read all modules from variable in default/main.yml dn: cn=module{0},cn=config objectClass: olcModuleList cn: module{0} olcModulePath: /opt/symas/lib/openldap olcModuleLoad: back_mdb olcModuleLoad: back_monitor olcModuleLoad: autoca.la olcModuleLoad: otp.la olcModuleLoad: argon2.la olcModuleLoad: syncprov olcModuleLoad: back_monitor olcModuleLoad: accesslog.la

dn: olcDatabase={-1}frontend,cn=config objectClass: olcDatabaseConfig objectClass: olcFrontendConfig olcDatabase: {-1}frontend olcSizeLimit: 500 olcAccess: {0}to * by dn.exact=gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth manage by dn.exact=gidNumber=1111+uidNumber=1111,cn=peercred,cn=external,cn=auth manage by * break olcAccess: {1}to dn="" by * read olcAccess: {2}to dn.base="cn=subschema" by * read olcPasswordHash: {ARGON2}

dn: olcBackend={0}mdb,cn=config objectClass: olcBackendConfig olcBackend: {0}mdb

dn: olcDatabase={0}config,cn=config objectClass: olcDatabaseConfig olcDatabase: {0}config olcRootDN: cn=admin,cn=config olcRootPW: {ARGON2}$argon2i$v=19$m=4096,t=3,p=1$cXdlcnJ0enV6dWlvMTIz$G/l0lynf7ygdz0tG+E7S1fBibsFs/L80AUSisiGl/v4 olcAccess: {0}to * by dn.exact=gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth manage by dn.exact=gidNumber=1111+uidNumber=1111,cn=peercred,cn=external,cn=auth manage by dn.exact=uid=ldap-admin,ou=users,dc=example,dc=net write by * break

dn: olcDatabase={1}monitor,cn=config objectClass: olcDatabaseConfig olcDatabase: {1}monitor olcAccess: {0}to dn.subtree="cn=monitor" by dn.exact=cn=admin,cn=config read by dn.exact=cn=admin,dc=example,dc=net read

dn: olcDatabase={2}mdb,cn=config objectClass: olcDatabaseConfig objectClass: olcmdbConfig olcDatabase: {2}mdb olcSuffix: dc=example,dc=net olcRootDN: cn=admin,dc=example,dc=net olcRootPW: {ARGON2}$argon2i$v=19$m=4096,t=3,p=1$cXdlcnJ0enV6dWlvMTIz$G/l0lynf7ygdz0tG+E7S1fBibsFs/L80AUSisiGl/v4 olcSizeLimit: unlimited olcTimeLimit: unlimited olcDbCheckpoint: 512 30 olcDbDirectory: /var/symas/openldap-data olcDbIndex: default eq olcDbIndex: objectClass olcDbIndex: entryUUID olcDbIndex: entryCSN olcDbIndex: cn pres,eq,sub olcDbIndex: uid pres,eq,sub olcDbIndex: mail pres,eq,sub olcDbIndex: sn pres,eq,sub olcDbIndex: description pres,eq,sub olcDbIndex: title pres,eq,sub olcDbIndex: givenName pres,eq,sub olcDbMaxSize: 85899345920 olcAccess: {0} to * by dn.exact=gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth manage by dn.exact=gidNumber=1111+uidNumber=1111,cn=peercred,cn=external,cn=auth manage by dn.exact=uid=ldap-admin,ou=users,dc=example,dc=net write by dn.exact=uid=repl-user,ou=users,dc=example,dc=net read by * break olcAccess: {1}to dn.exact="" by * read olcAccess: {2}to dn.base="cn=subschema" by * read olcAccess: {3} to attrs=userPassword by anonymous auth by self write by * none olcLimits: {0} dn.exact="uid=repl-user,ou=users,dc=example,dc=net" time=unlimited size=unlimited olcLimits: {1} dn.exact="uid=ldap-admin,ou=users,dc=example,dc=net" time=unlimited size=unlimited

------------------ The "ServerID" is different for every server, every thing else is identical.

Then I created a file to change the serverID: ------------------ dn: cn=config changetype: modify replace: olcServerID olcServerID: 1 ldap://ldap01.example.net olcServerID: 2 ldap://ldap02.example.net olcServerID: 3 ldap://ldap03.example.net olcServerID: 4 ldap://ldap04.example.net ------------------

and a file to configure the replication: ------------------ dn: olcOverlay=syncprov,olcDatabase={0}config,cn=config changetype: add objectClass: olcOverlayConfig objectClass: olcSyncProvConfig olcOverlay: syncprov

dn: olcDatabase={0}config,cn=config changetype: modify replace: olcSyncRepl olcSyncRepl: rid=1 provider=ldap://ldap01.example.net binddn="cn=admin,cn=config" bindmethod=simple credentials=secret searchbase="cn=config" type=refreshAndPersist retry="5 5 300 20" timeout=1 starttls=yes olcSyncRepl: rid=2 provider=ldap://ldap02.example.net binddn="cn=admin,cn=config" bindmethod=simple credentials=secret searchbase="cn=config" type=refreshAndPersist retry="5 5 300 20" timeout=1 starttls=yes olcSyncRepl: rid=3 provider=ldap://ldap03.example.net binddn="cn=admin,cn=config" bindmethod=simple credentials=secret searchbase="cn=config" type=refreshAndPersist retry="5 5 300 20" timeout=1 starttls=yes olcSyncRepl: rid=4 provider=ldap://ldap04.example.net binddn="cn=admin,cn=config" bindmethod=simple credentials=secret searchbase="cn=config" type=refreshAndPersist retry="5 5 300 20" timeout=1 starttls=yes - add: olcMirrorMode olcMirrorMode: TRUE ------------------

When I configure the server via Ansible (everything in one playbook) the replication of cn=config is not working. When I only do the basic configuration via Ansible and then add the change of serverID and then the replication of cn=config step by step on every single server: ------------- ldapmodify -Y EXTERNAL -H ldapi:/// -f serverid.ldif ldapmodify -Y EXTERNAL -H ldapi:/// -f repl_config.ldif ------------- everything is fine. The two files "serverid.ldif" and "repl_config.ldif" are the files Ansible created, so the content of the file is the same.

Can it be, that the problem is because Ansible first sets all the ServerIDs on all servers and then configure the replication of cn=config on all servers?

For setting up the configuration I took: https://www.openldap.org/devel/admin/replication.html Starting at 18.3.3

What I don't understand: Do I realy have to put all Servers in the replication, even the server it self? So do I realy have to add on Server-01, the Server "server-01, server-02, server-03 ,server-04" to the replication? Dosn't it mean that server-01 is replicating to it self? If it's correct, can someone explain why? O did I understud something wrong on the webpage?

Stefan