V4/FreeIPA to FreeIPA Migration
Purpose of this feature is to provide means of migration between two FreeIPA deployments that would be easy to use and allowed migration of as large a portion of FreeIPA content as possible.
Existing migration feature provided by ipa migrate-ds command is originally designed to migrate contents from a Directory Server. When used for migration from another FreeIPA deployment, user has to specify number of options in order to secure successfull migration. More importantly, this feature only provides migration for users and groups only.
New migration feature will provide means to migrate not only user and groups, but also certificates, sudo rules, HBAC rules etc. Also since the structure of source data is predefined, the command will require significantly less options to run properly.
As a company manager, I want to modernize name of the company and change domain accordingly to maintain uniformity. In such a case, I want to be able to migrate at least the most important contents of company's FreeIPA deployment to ensure as little disruption of operations as possible.
As a businessman, I want to include newly acquired company into the organization structure of my existing company. If both companies use FreeIPA, such a transition will be less costly and more secure with a dedicated migration tool.
As an administrator, I want to be able to use a tool to extract contents of FreeIPA in case our infrastructure is damaged. Such a tool would enable us to salvage as much data as possible by transferring it to newly built infrastructure.
All contents in FreeIPA deployment are saved in LDAP directory tree. Migration from one deployment to another is thus best handled via LDAP operations on source and target deployments - find entries for migration on source deployment and insert them to target deployment.
This approach requires changes to be made for entries:
- domain name - every attribute that contains domain name (even as part of DN) needs to be changes to refer to domain name of target deployment (e.g. DN, Kerberos principal, certificate subject, references to other entries (e.g. user/manager relationship), ...)
- Kerberos key - so far there is no way to migrate Kerberos master key, which makes migration of Kerberos passwords and related attributes irrelevant
The migration cannot be performed for some entries, e.g. migration of topology and trusts is not possible - these need to be newly created in target deployment.
Types of entries that can be migrated are:
- users, groups;
- sudo rules, sudo commands, sudo command groups;
- hosts, services;
- ID views;
- ID ranges;
- CA ACL;
- OTP tokens;
- password policies;
Migration is designed to be available for users with "admin" privileges in target FreeIPA deployment. In source deployment the user can authenticate as any user even without admin privileges, and only the data this user has access to will be migrated.
Entries to be migrated from original FreeIPA deployment will be retrieved in two steps: at first, only DNs of the entries will be retrieved via ldapsearch. Then, for each stored DN, a new ldapsearch will be performed that will retrieve all data for the entry. This approach is chosen to eliminate issues occuring with migrate-ds command, which fails when migrating deployments with huge amount of entries.
Web UI management for this feature is not yet considered.
FreeIPA must be installed and migration enabled on target server:
$ kinit admin $ ipa config-mod --enable-migration=True
By default, migration is disabled when compat plugin is enabled. Either disable compat plugin and restart Directory Server, or use --with-compat option.