Samba4 Troubleshooting

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Troubleshooting

Update Samba

  • When updating Samba you should only be doing a version change on one DC at a time. Then verify that the DC is working in the domain before upgrading other DCs, don't update more than one DC at a time, have proper backups!
  • https://wiki.samba.org/index.php/Updating_Samba
  • Stop service and make backup
systemctl stop samba
/usr/local/samba/bin/samba_backup
  • Get samba, configure and install
wget http://www.samba.org/samba/ftp/stable/samba-4.3.3.tar.gz
tar -zxvf samba-4.3.3.tar.gz
cd ~/samba-4.3.3
./configure --enable-debug --enable-selftest --with-ads --with-systemd --with-winbind
  • Make sure configure completes successfully, be sure you have proper backups!!!
  • Read the release notes to check compatibility.
make
make install
  • start the samba service
systemctl start samba
  • Go check the logs and verify the system came up correctly:
tail /usr/local/samba/var/$LOGNAME.log
  • Test around and see that replication is still in sync. Check that other DCs logs for errors about upgraded DC or replication.

Checking Replication

  • Check replication status
samba-tool drs showrepl

Force Removal of DC

Demote a DC

Join a DC

Backup and Restore

LDB Search/Edit

  • ldb search example:
ldbsearch -H /usr/local/samba/private/sam.ldb.d/DC\=DOMAINDNSZONES\,DC\=***\,DC\=***\,DC\=***\,DC\=***.ldb
  • weird error with tombstone lifetime
[2015/05/20 14:27:27.377734,  0] ../source4/dsdb/repl/replicated_objects.c:783(dsdb_replicated_objects_commit)
 Failed to apply records: replmd_replicated_apply_add: error during DRS repl ADD: No objectClass found in replPropertyMetaData for DC=lluvia\0ACNF:fe4415b8-8a9d-417d-abb3-77771ec99f88\0ADEL:fe4415b8-8a9d-417d-abb3-77771ec99f88,CN=Deleted Objects,DC=DomainDnsZones,DC=***,DC=***,DC=***,DC=edu!
 : Object class violation
  • use ldbedit to change the tombstone lifetime from 6 months to 10 days to get rid of all extra "Deleted Objects" that wont replicate
ldbedit -H ldap://localhost -Uadministrator -s base -b "CN=Directory Service,CN=Windows NT,CN=Services,CN=Configuration,DC=***,DC=***,DC=***,DC=***"