OpenLDAP vs Samba Active Directory DC
A side-by-side comparison of two self-hosted identity & sso options — licensing, setup difficulty, resource needs, and what each one replaces.
OpenLDAP
The classic open-source Lightweight Directory Access Protocol server
VS
Samba Active Directory DC
Open-source Active Directory compatible domain controller
| Feature | OpenLDAP | Samba Active Directory DC |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Category | Identity & SSO | Identity & SSO |
| License | OLDAP-2.8 | GPL-3.0 |
| Language | C | C |
| Setup difficulty | Hard | Hard |
| Min. RAM | 128 MB | 512 MB |
| Deployment | docker, bare-metal, source | docker, bare-metal, source |
| GitHub stars | ★ 400 | ★ 1,000 |
| First released | 1998 | 1992 |
| Replaces | Active Directory | Active Directory, Windows Server |
What are OpenLDAP and Samba Active Directory DC?
OpenLDAP
OpenLDAP is a free, open-source implementation of the Lightweight Directory Access Protocol. It is widely used as a directory backend for authentication, address books and centralized user management.
- Industry-standard LDAP directory
- High performance and scalability
- Replication and clustering support
- Extensible schema system
Samba Active Directory DC
Samba can act as an Active Directory domain controller, providing centralized authentication, group policy and directory services for Windows and Linux clients. It is a free alternative to Windows Server domains.
- Active Directory compatible domain controller
- Kerberos and LDAP authentication
- Group policy support
- File and print services included
OpenLDAP vs Samba Active Directory DC: key differences
Both projects are written in C. Licensing differs — OLDAP-2.8 for OpenLDAP versus GPL-3.0 for Samba Active Directory DC. OpenLDAP is the lighter option, starting around 128 MB of RAM against 512 MB for Samba Active Directory DC. Samba Active Directory DC is the more established project (first released 1992), while OpenLDAP arrived in 1998. Samba Active Directory DC has the considerably larger community, at 1,000 GitHub stars versus 400.
Why pick each one
Choose OpenLDAP if…
- Extremely mature and stable
- Universally compatible
Watch out for
- Notoriously complex configuration
Choose Samba Active Directory DC if…
- Drop-in AD replacement
- Mature and widely deployed
Watch out for
- Complex to configure correctly
Frequently asked questions
Is OpenLDAP or Samba Active Directory DC better?
Neither is universally better. Samba Active Directory DC has the larger community; both share a hard setup difficulty, so the decision comes down to features and licensing.
Are OpenLDAP and Samba Active Directory DC free and open-source?
Yes. OpenLDAP is licensed under OLDAP-2.8 and Samba Active Directory DC under GPL-3.0. Both can be self-hosted at no software cost.
Can I run OpenLDAP and Samba Active Directory DC with Docker?
OpenLDAP: yes. Samba Active Directory DC: yes.
Which is lighter on resources, OpenLDAP or Samba Active Directory DC?
OpenLDAP has the smaller minimum footprint at 128 MB of RAM, compared to about 512 MB for Samba Active Directory DC. Real-world usage depends on library size, user count, and enabled features.