The nethserver-dc package runs a systemd-nspawn container (
nsdc) with a vanilla
Samba 4 inside of it. It downloads, installs, configures and provision an Active
Directory domain controller based on Samba.
nsdc container needs an IP address in a green network, different from the
host machine one. It enslaves its network interface to a host bridge, with green
role. If needed, this bridge is created automatically.
This is a typical configuration:
# config show nsdc nsdc=service ProvisionType=newdomain IpAddress=192.168.122.50 bridge=br0 status=enabled
- it creates and configures systemd-nspawn machine (nethserver-dc-install
action). The Samba domain is provisioned by the
samba-provision.serviceunit, according to the
ProvisionTypeprop value. Supported values are:
newdomain(default): domain and realm are taken from local system and won’t be possible to change them anymore. For instance if system domain is nethserver.org domain will be NETHSERVER and realm nethserver.org.
ns6upgrade: connect the LDAP service running on the host machine and migrate the WS/PDC domain from ns6 backup to an Active Directory domain. The realm and domain name are set as described in the
- it creates a network bridge if needed, or select an existing one and save it in nsdc bridge db prop (nethserver-dc-create-bridge action)
- it waits for the machine to come up (nethserver-dc-waitstart)
- it joins the domain of new machine using default credentials (nethserver-dc-join).
- it sets the password policy (nethserver-dc-password-policy)
Realmd writes a lot of information on the system journal. See journalctl command.
To have a shell inside the
nsdc container, you can run
# systemd-run -M nsdc -t /bin/bash
nethserver-dc-join action joins automatically to domain. If you want to join domain manually, check that machine came up
# host -t SRV _ldap._tcp.`config get DomainName` _ldap._tcp.nethsever.org has SRV record 0 100 389 nsdc-vm8.nethsever.org.
then clear sssd.conf, join domain and expand sssd.conf template
> /etc/sssd/sssd.conf realm join $(hostname -d) expand-template /etc/sssd/sssd.conf
Then provide the default administrator password:
If everything goes well
getent passwd administrator@$(hostname -d) # output: email@example.com:*:261600500:261600513:Administrator:/firstname.lastname@example.org:/bin/bash
Once domain is joined, you can manage users from interface. From command line, you can use net command
# net ads info
The “Start DC” procedure from the “Accounts provider” page is designed for a single run. If it fails, reinstalling the whole server can be avoided by running the following command
The command cleans up the DC state and prepare it for new provisioning run. Any existing user and group account is erased.
If a full DC reinstall is desired, after factory reset event, run also
rm -rf /var/lib/machines/nsdc
Upgrade the containter¶
The upgrade procedure will:
- stop the container
- upgrade the chroot base system
- upgrade samba
- restart the container
To upgrade, execute:
Changing the IP address of DC¶
Before applying this procedure, read carefully the official Samba wiki page.
The IP address of nsdc containter must be in the same network of the bridged green interface. If needed, first change the address of the green interface, then proceed with the following.
Example, change the network address:
- current host IP: 192.168.101.7
- current nsdc container IP: 192.168.122.77
- new nsdc container IP: 192.168.101.77
nethserver-dc-change-ip with the new ip address:
signal-event nethserver-dc-change-ip <new_ip_address>
signal-event nethserver-dc-change-ip 192.168.101.77
Note that the event will fail if the new nsdc ip address is not in the same network of the green interface.
Alternate UPN suffix¶
The default UPN (User Principal Name) suffix for a user account is the SSSD realm, but the nsdc containter is configured to use also an extra UPN suffix set to the FQDN of the host machine.
- Host FQDN: nethserver.org
- SSSD realm: ad.nethserver.org
- Default UPN: ad.nethserver.org
- Extra UPN: nethserver.org
If required, the administrator can use RSAT tools to select the extra UPN for a specific user.