On Tue, 2018-08-14 at 21:46 +0000, Devon Peters wrote: > Hi folks, > > We've got multi-master replication setup between two masters. The > replication recently broke after being stable for a few years, and in > troubleshooting it appears that the issue is that both masters have > the same nsDS5ReplicaId defined (both are set to 2). Both masters > have nearly the same output from running: > > $ ldapsearch -x -b 'cn=replica,cn="dc=someorg,dc=com",cn=mapping > tree,cn=config' -D "cn=Directory Manager" -W > > # replica, dc\3Dsomeorg\2Cdc\3Dcom, mapping tree, config > dn: cn=replica,cn=dc\3Dsomeorg\2Cdc\3Dcom,cn=mapping > tree,cn=config > objectClass: nsDS5Replica > objectClass: top > nsDS5ReplicaRoot: dc=someorg,dc=com > nsDS5ReplicaType: 3 > nsDS5Flags: 1 > nsDS5ReplicaId: 2 > nsds5ReplicaPurgeDelay: 604800 > nsDS5ReplicaBindDN: cn=replication manager,cn=config > cn: replica > nsState:: > AgAAAAAAAADES3NbAAAAAAAAAAAAAAAAAgAAAAAAAAABAAAAAAAAAA== > nsDS5ReplicaName: 52c33a02-368211e1-a5228b52-eb63f05c > nsds5ReplicaChangeCount: 17190 > nsds5replicareapactive: 0 > > The only difference in this output between the two servers is the > nsds5ReplicaChangeCount. > > > I believe I can use ldapmodify to change the replica ID on one of the > nodes, but am unsure whether or not this is the proper way to fix the > issue - or if there is anything additional that needs to take into > account when making this change. > > We inherited this LDAP system a while ago, and are not very familiar > with how replication works in general, so we're reluctant to try this > in fear of causing more damage by doing the wrong thing.
First, take backups. After that you need to check to see if there are missing entries or attributes on either side of the replication. Choose the master that is "correct" as the master to leave the replicaID's untouched. Once done, you would fence the nodes, change the replica ID of the "less correct" master, then do a full-re-init from the unchanged master. That should resolve the issue. Again, backups. Lots of backups. db2ldif is your friend :) Hope that helps, -- Sincerely, William _______________________________________________ 389-users mailing list -- 389-users@lists.fedoraproject.org To unsubscribe send an email to 389-users-le...@lists.fedoraproject.org Fedora Code of Conduct: https://getfedora.org/code-of-conduct.html List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/389-users@lists.fedoraproject.org/message/Z3SJNNFYATNDCRSN753MBYMGFNFPRXHB/
