# Forest Functional Level 2016 and AD Schema 2022

Since 4.19.0, you can raise the domain functional level of an existing domain to FL 2016, and AD Schema version to 88 (Windows Server 2019 / 2022).

## Determine the AD Schema Version

You need first to determine the actual AD Schema on your Samba-AD installation :

    ldbsearch -H /var/lib/samba/private/sam.ldb -b "cn=Schema,cn=Configuration,DC=$(hostname -d | sed 's/\./,DC=/g')" -s base objectVersion

Attention

If you are bellow 47 (if you come from MS SBS, MS 2003), you cannot upgrade easily your schema. Please contact Tranquil-IT for assistance.

Note

All AD Schema versions are available here : https://wiki.samba.org/index.php/AD_Schema_Version_Support

## Determine the domain functional level

You can determine the function level for your domain with this samba-tool command :

    root:~# samba-tool domain level show

    Domain and forest function level for domain 'DC=domain,DC=lan'

    Forest function level: (Windows) 2008 R2
    Domain function level: (Windows) 2008 R2
    Lowest function level of a DC: (Windows) 2008 R2

Attention

If you are bellow 2008R2 lowest functional level of a DC, please contact Tranquil-IT for assistance.

## Raising functional level from new Samba-AD version 4.19.0 or later

For new domain from 4.19.0, just add to your /etc/samba/smb.conf on the [global] section to all your Samba-AD domain controllers :

    ad dc functional level = 2016

And restart samba :

    systemctl restart samba-ad-dc     # debian
    systemctl restart samba           # RedHat or derivated

## Raising functional level from older Samba-AD

For older domain, you must update your /etc/samba/smb.conf on the [global] section to all your Samba-AD domain controllers :

    ad dc functional level = 2016

And restart samba :

    systemctl restart samba-ad-dc     # debian
    systemctl restart samba           # RedHat or derivated

On the FSMO owner domain controller, run this :

    samba-tool domain schemaupgrade --schema=2019
    samba-tool domain functionalprep --function-level=2016
    samba-tool domain level raise --domain-level=2016 --forest-level=2016

You are now on Forest Level 2016 and AD Schema version 88 (Windows Server 2019 / 2025).